JP2013044379A - Gasket and throttle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for preventing rotation of a gasket and securing pressure that the gasket gives to a joint surface.SOLUTION: A gasket is mounted in a groove formed in a first member and has elasticity for sealing between the first member and a second member. The gasket includes a first abutting part abutted to the second member, a second abutting part abutted to one sidewall surface of the groove, a third abutting part abutted to another sidewall surface of the groove, and a fourth abutting part in which protruded parts are formed which are protruded in a depth direction of the groove while being bisected in a depth direction of the groove, and in which distal ends of the two protruded parts are abutted to a bottom surface of the groove. The gasket is formed in such a manner that a height of the gasket which is a length in a depth direction of the gasket becomes greater than the depth of the groove and a protruded length of the two protruded parts becomes equal to or more than a difference between the height of the gasket and the depth of the groove.

Description

  The present invention relates to a gasket and a throttle device for sealing between two joint surfaces.

  For example, there is a technique in which a gasket compressed in a groove seals between the joint surface of the throttle device and the joint surface of the intake manifold by attaching a gasket in the groove provided in the throttle device and joining the gasket to the intake manifold. Are known.

  In this gasket, when the throttle device is inserted into the intake manifold and joined, there is a problem that a compression force is applied from the side by the insertion and the gasket rotates in the groove. A technique for preventing this and stabilizing the sealing performance is known (for example, see Patent Document 1).

Japanese Patent No. 4243700

  In the technique in which rotation is prevented by increasing the ratio of the contact surface of the gasket to the wall surface of the groove as described above, the gasket filling rate, which is the ratio of the volume of the gasket to the volume of the groove, becomes high. Thereby, when compressing a gasket, a big pressure acts on a joining surface, and there exists a possibility that a joining surface may change. Further, if the volume filling rate of the gasket is simply lowered in order to prevent the joint surface from being deformed, an appropriate surface pressure between the gasket and the joint surface cannot be obtained, and airtightness cannot be secured.

  The present invention has been made to solve the above-described problems, and provides a technique for preventing the rotation of the gasket that is subjected to a pressing force from the lateral direction and ensuring the pressure that the gasket applies to the joint surface. Objective.

  In order to solve the above-described problem, a gasket according to an embodiment of the present invention is a gasket that is attached to a groove formed in a first member and has elasticity to seal between the first member and the second member. The first contact portion that contacts the second member, the second contact portion that contacts one side wall surface of the groove, and the third contact portion that contacts the other side wall surface of the groove And a fourth contact portion that is divided into two in the width direction of the groove and that protrudes in the depth direction of the groove, and a tip of each of the two protrusions contacts the bottom surface of the groove. And the height of the gasket, which is the length in the depth direction of the gasket, is larger than the depth of the groove, and the projecting length of the two projecting portions is the height of the gasket and the height of the gasket. It is a gasket formed so as to be more than the difference with the depth of the groove.

  A throttle device according to another embodiment of the present invention is a throttle device mounted on an intake manifold, and has a flat surface facing a joint surface of the intake manifold, and communicates with the intake manifold in the flat surface. A joint formed with an opening and an annular groove formed on the periphery of the opening; a gasket attached to the groove and having elasticity; and a first contact part that contacts the joint surface of the intake manifold; A depth of the groove that is divided into two in the width direction of the groove, a second contact portion that contacts the inner peripheral wall surface of the groove, a third contact portion that contacts the outer peripheral wall surface of the groove, and A protrusion that protrudes in the direction, and a fourth contact portion that contacts the bottom surface of the groove, and has a length in the depth direction of the gasket. gasket The height is formed to be greater than the depth of the groove, and the protrusion length of the two protrusions is formed to be equal to or greater than the difference between the height of the gasket and the depth of the groove, and is attached to the intake manifold. And a gasket that seals the periphery of the opening of the throttle device and communicates the intake manifold and the opening.

  ADVANTAGE OF THE INVENTION According to this invention, while preventing rotation of a gasket, the pressure given to a joint surface can be set appropriately.

It is a disassembled perspective view which shows the structure of an intake module. It is a disassembled sectional view which shows the structure of a bore, a gasket, and an accommodating part. It is sectional drawing which shows the gasket and annular groove in a 1st state before a gasket is inserted in an annular groove. It is sectional drawing which shows the gasket and annular groove in the 2nd state by which the gasket was inserted by the annular groove. It is sectional drawing which shows the bore in the 3rd state in which the bore | bore was inserted in the accommodating part and the front-end | tip of the 1st contact part contact | abutted to the joining inner wall surface, and a accommodating part. It is sectional drawing which shows the gasket and annular groove in a 3rd state. It is sectional drawing which shows the gasket and annular groove in the 4th state in which the protrusion part was compressed by the pressing force from an accommodating part. It is sectional drawing which shows the bore in the 5th state in which the 1st contact part was compressed with the pressing force from an accommodating part, a gasket, and an accommodating part. It is sectional drawing which shows the gasket and annular groove in a 5th state.

  Embodiments of the present invention will be described below with reference to the drawings.

  In this embodiment, an intake module for an internal combustion engine will be described.

  First, the structure of the intake module will be described.

  FIG. 1 is an exploded perspective view showing the structure of the intake module. The intake module includes an intake manifold 1 that forms an air flow path, a throttle body 2 that is attached to the intake manifold 1 to form a part of the flow path, and passes through the throttle body 2 and is fastened to the intake manifold 1. Bolts 3x and 3y are included. The intake manifold 1 distributes incoming air to a plurality of cylinders of an internal combustion engine (not shown). The throttle body 2 adjusts the air flow rate. The bolts 3x and 3y are fixed to the intake manifold 1 while pressing the throttle body 2 against the intake manifold 1. The throttle device recited in the claims corresponds to, for example, the throttle body 2.

  The intake manifold 1 has an upstream end communicating with a downstream end of an air cleaner (not shown) and a downstream end communicating with an upstream end of the throttle body 2, and an intake manifold 12 provided downstream of the intake pipe 12. An accommodating portion 13 accommodating a part of the body 2, a surge tank 16 provided on the downstream side of the accommodating portion 13 and having an upstream end communicating with the downstream end of the throttle body 2, and respective upstream ends A plurality of distribution pipes 17 communicated with the downstream end of the surge tank 16 and each downstream end communicated with a plurality of cylinders (not shown), and a plurality of distribution pipes 17 are provided on the respective wall surfaces. A plurality of injectors 18 for injecting fuel into each of the distribution pipes 17 and fixing portions 19x and 19y provided on the outer wall of the accommodating portion 13 for fixing the bolts 3x and 3y, respectively. To.

  The throttle body 2 has a cylindrical bore 23 whose upstream end communicates with the downstream end of the intake pipe 12 and whose downstream end communicates with the upstream end of the surge tank 16, and a central axis ( A shaft 24 provided perpendicular to the air flow direction), a throttle valve 25 which is a valve body fixed to the shaft 24 in the bore 23, and a shaft 24 connected to the base end of the shaft 24 to drive the shaft 24 Drive portion 26, gaskets 27a and 27b provided at the upstream end and the downstream end of the bore 23, and through holes 29x and 29y through which the bolts 3x and 3y pass, respectively. The drive unit 26 adjusts the flow rate of air in the bore 23 by rotating the shaft 24 according to an instruction from a control device (not shown) and changing the opening of the throttle valve 25. Each of the gaskets 27a and 27b is an annular elastic body. As a material for the gaskets 27a and 27b, for example, hydrogenated nitrile rubber is used.

  While the bore 23 is inserted into the receiving portion 13, the shaft 24 moves on the line II-II shown in FIG. After the bore 23 is inserted into the housing portion 13, the intake pipe 12, the bore 23, and the surge tank 16 communicate with each other. As a result, the air flowing from the air cleaner to the intake module flows through the intake pipe 12, the bore 23, the surge tank 16, and the plurality of distribution pipes 17 to each of the plurality of cylinders.

  Note that the first member described in the claims corresponds to, for example, the bore 23, and the second member corresponds to, for example, the accommodating portion 13.

  Next, the bore 23, the gaskets 27a and 27b, and the accommodating portion 13 will be described. FIG. 2 is an exploded cross-sectional view showing the structure of the bore 23, the gaskets 27a and 27b, and the accommodating portion 13. 2 to 9 show cross sections taken along line II-II along a plane passing through the line II-II shown in FIG. 1 and the central axis of the bore 23.

  The housing portion 13 includes an insertion port 131 that is an opening into which the bore 23 is inserted, a cylindrical inner wall surface 132 that forms the inner wall surface of the cylinder and covers the outer wall surface of the cylinder of the bore 23, Among these, there are a joined inner wall surface 134a that is a plane joined to the upstream end of the bore 23, a joined inner wall surface 134b that is a plane joined to the downstream end of the bore 23 among the inner walls, and an opening formed in the joined inner wall surface 134a. It has an inner wall opening 136 a that communicates with the upstream end of the bore 23, and an inner wall opening 136 b that is an opening formed in the joint inner wall surface 134 b and communicates with the downstream end of the bore 23.

  The bore 23 includes a cylindrical outer wall surface 232 that forms a cylindrical outer wall surface of the outer wall, a bonded outer wall surface 234a that is a flat surface formed at the upstream end of the outer wall and is bonded to the bonded inner wall surface 134a, A joint outer wall surface 234b which is a flat surface formed at the downstream end and joined to the joint inner wall surface 134b, an outer wall opening 236a which is an opening formed in the joint outer wall surface 234a and communicates with the inner wall opening 136a, and a joint outer wall surface 234b An outer wall opening 236b communicating with the inner wall opening 136b, an annular groove 280a formed around the outer wall opening 236a in the joint outer wall surface 234a, and an outer wall opening 236b around the outer wall opening 236b in the joint outer wall surface 234b. It has an annular groove 280b formed.

  The shapes of the gaskets 27a and 27b are respectively formed according to the shapes of the annular grooves 280a and 280b, and are fitted into the annular grooves 280a and 280b, respectively.

  The grooves described in the claims correspond to, for example, the annular grooves 280a and 280b, and the openings correspond to, for example, the outer wall openings 236a and 236b.

  Here, a plane passing through the shaft 24 and perpendicular to the central axis of the bore 23 is taken as a reference plane. The closed throttle valve 25 is located in the reference plane. Further, the shape of the bonded inner wall surface 134a and the inner wall opening 136a and the shape of the bonded inner wall surface 134b and the inner wall opening 136a are plane-symmetric with respect to the reference plane. Similarly, the shape of the joining outer wall surface 234a, the outer wall opening 236a, the annular groove 280a, and the gasket 27a and the shape of the joining outer wall surface 234b, the outer wall opening 236b, the annular groove 280b, and the gasket 27b are symmetrical with respect to the reference plane. is there.

  Each of the joining inner wall surfaces 134a and 134b forms a predetermined angle with the reference surface. The joint inner wall surface 134a gradually decreases in distance from the reference surface in the insertion direction from the insertion port 131 into the housing portion 13. Similarly, the joint inner wall surface 134b gradually decreases in distance from the reference surface in the insertion direction. Therefore, the length of the space in the accommodating portion 13 in the central axis direction (air flow direction) of the bore 23 is gradually shortened in the insertion direction. The length of the bore 23 in the central axis direction is gradually shortened from the proximal end of the shaft 24 toward the distal end in accordance with the space in the accommodating portion 13. That is, the joining outer wall surfaces 234a and 234b are formed obliquely with respect to the insertion direction. As a result, the shapes of the outer wall openings 236a and 236b, which are cross sections obtained by cutting the cylindrical bore 23 along the planes of the joining outer wall surfaces 234a and 234b, are elliptical. The shapes of the inner wall openings 136a and 136b are the same as the outer wall openings 236a and 236b communicating with each other.

  The distance between the outer wall opening 236b and the annular groove 280b formed around the outer wall opening 236b is not uniform, and the distance on the tip side of the shaft 24 is long. Therefore, when viewed from the central axis of the bore 23, the shapes of the annular groove 280b and the gasket 27b on the joint outer wall surface 234b are oval. When the gasket 27b fitted in the annular groove 280b comes into contact with the joined inner wall surface 134b, the portion of the gasket 27b on the tip end side of the shaft 24 comes into contact with the joined inner wall surface 134b on the outer peripheral side of the inner wall opening 136b. Thereby, when the bore 23 is inserted into the accommodating portion 13, the gasket 27b can be prevented from being hooked on the edge of the inner wall opening 136b, and the gasket 27b can slide smoothly on the joint inner wall surface 134b.

  Next, the gaskets 27a and 27b and the annular grooves 280a and 280b will be described together with an attaching process for attaching the throttle body 2 to the intake manifold 1. FIG.

  Here, the structure and state change of the gasket 27b and the annular groove 280b will be described. The gasket 27a and the annular groove 280a have the same configuration as the gasket 27b and the annular groove 280b, which are in a plane-symmetrical relationship, and change in the same state.

  First, a state before the gasket 27b is fitted into the annular groove 280b is defined as a first state. As shown in FIG. 2, the cross section on the tip end side of the shaft 24 and the cross section on the base end side of the shaft 24 appear in the cross sections taken along the arrows II-II of the gasket 27b and the annular groove 280b. The cross-sectional shape on the distal end side of the shaft 24 and the cross-sectional shape on the proximal end side of the shaft 24 are the same. 3, 4, 6, 7, and 8 show only the cross section on the tip end side of the shaft 24 among these two cross sections. FIG. 3 is a cross-sectional view showing the gasket 27b and the annular groove 280b in the first state.

  The annular groove 280b includes an opening 281 that is an opening formed in the plane of the joint outer wall surface 234b, a side wall surface 282 that is positioned on the inner peripheral side of the inner wall surface, and a side wall surface that is positioned on the outer peripheral side of the inner wall surface. 283 and a bottom surface portion 284 which is a bottom surface of the annular groove 280b in the inner wall surface. In this cross section, when the length in the height direction of the gasket 27b is Hg and the length in the depth direction of the annular groove 280b is Hd along the center line 300 of the gasket 27b and the annular groove 280b, Hg is greater than Hd. large. That is, the gasket 27b fitted in the annular groove 280b protrudes from the joint outer wall surface 234b.

  The shape of the cross section perpendicular to the circumferential direction (length direction) of the annular groove 280b is a trapezoid. If the groove width at the bottom surface portion 284 is Wb and the groove width at the opening 281 is Wo along the joint outer wall surface 234b, Wb is smaller than Wo. In the space in the annular groove 280b, the length in the groove width direction gradually increases as the height position increases from the bottom surface part 284 toward the opening part 281. Each of the side wall surfaces 282 and 283 forms a predetermined angle with the center line 300, and the inner peripheral side wall surface 282 is inclined toward the opening 281 side from the outer peripheral direction of the annular groove 280b, and the outer peripheral side wall surface 283 is inclined toward the opening 281 side from the inner circumferential direction of the annular groove 280b.

  The apex between the bottom surface portion 284 and the side wall surfaces 282 and 283 is rounded, and the apex between the joint outer wall surface 234b and the side wall surfaces 282 and 283 is rounded. ing. Each of the side wall surfaces 282 and 283 may be parallel to the center line 300. That is, the shape of the cross section perpendicular to the circumferential direction of the annular groove 280b may be a rectangle.

  The gasket 27b includes a first contact portion 271 protruding in the height direction opposite to the depth direction of the annular groove 280b, a second contact portion 272 protruding toward the inner peripheral side of the gasket 27b, and the gasket 27b. A third abutting portion 273 projecting to the outer peripheral side, a fourth abutting portion 274 projecting in the depth direction of the annular groove 280b, and a second abutting portion 272 and a fourth abutting portion in the depth direction. 274 is provided between the third contact portion 273 and the fourth contact portion 274 in the depth direction, and is provided between the fifth contact portion 275 projecting to the inner peripheral side of the gasket 27b. And a sixth abutting portion 276 projecting to the outer peripheral side of the gasket 27b. The fourth contact portion 274 has projecting portions 274a and 274b that are divided into two in the groove width direction of the annular groove 280b and project in the depth direction. The protruding portion 274a is formed on the inner peripheral side (fifth contact portion 275 side) of the gasket 27b with respect to the center line 300, and the protruding portion 274b is on the outer peripheral side (sixth contact portion) of the gasket 27b with respect to the center line 300. 276 side). The two protrusions 274a and 274b are arranged side by side in the insertion direction in the cross section of the gasket 27b orthogonal to the insertion direction of the throttle body 2 (first member). The cross-sectional shapes of the first contact portion 271, the second contact portion 272, the third contact portion 273, the fifth contact portion 275, and the sixth contact portion 276 become gradually narrower toward the tip. Yes.

  In the first state, the height from the tip of the protrusion 274a to the tip of the first contact portion 271 is equal to the height from the tip of the protrusion 274b to the tip of the first contact portion 271. Further, the height from the tip of the fourth contact portion 274 to the tip of the second contact portion 272 is equal to the height from the tip of the fourth contact portion 274 to the tip of the third contact portion 273. If this height is Ha, Ha is smaller than Hd. When the length in the groove width direction from the tip of the second contact portion 272 to the tip of the third contact portion 273 in the first state is Wa, Wa is greater than Wb and less than or equal to Wo. In the first state, the height from the tip of the fourth contact portion 274 to the tip of the fifth contact portion 275 and the height from the tip of the fourth contact portion 274 to the tip of the sixth contact portion 276 Are equal. When the length in the groove width direction from the tip of the fifth contact portion 275 to the tip of the sixth contact portion 276 in the first state is Wm, Wm is larger than Wb and smaller than Wa. Further, assuming that the height from the distal end to the proximal end of the protruding portions 274a and 274b, that is, the depth of the space (crotch) sandwiched between the protruding portions 274a and 274b, is Hf, and the difference between Hg and Hd is ΔH, Hf is ΔH or more.

  Next, the gasket 27b is conveyed from the first state in the depth direction along the center line 300 and is inserted into the annular groove 280b. Next, the bore 23 is inserted into the accommodating portion 13 from the insertion port 131. This state is referred to as a second state. FIG. 4 is a cross-sectional view showing the gasket 27b and the annular groove 280b in the second state. In the second state, the respective leading ends of the second abutting portion 272 and the fifth abutting portion 275 abut on the side wall surface 282, and the respective leading ends of the third abutting portion 273 and the sixth abutting portion 276 are side wall surfaces. The front ends of the projecting portions 274 a and 274 b in the fourth contact portion 274 are in contact with the bottom surface portion 284. At this time, each of the second contact portion 272 and the fifth contact portion 275 receives a drag force from the side wall surface 282, and each of the third contact portion 273 and the sixth contact portion 276 receives a drag force from the side wall surface 283. The fourth contact portion 274 receives a drag force from the bottom surface portion 284. Thereby, the gasket 27b is supported by the annular groove 280b.

  Here, the distance between the joining outer wall surface 234b and the joining inner wall surface 134b is defined as Dg. Due to the above-described plane-symmetric shape, the distance between the bonded inner wall surface 134a and the bonded outer wall surface 234a is also equal to Dg. As the bore 23 advances into the accommodating portion 13, Dg decreases. When each of the joining outer wall surface 234b and the joining inner wall surface 134b forms a predetermined angle with the reference surface (insertion direction), the joining inner wall surface 134b approaches relatively obliquely while keeping parallel to the joining outer wall surface 234b. .

  Next, when the bore 23 is further inserted from the second state and Dg is further reduced, the tip of the first abutting portion 271 abuts on the joining inner wall surface 134b. This state is referred to as a third state. FIG. 5 is a cross-sectional view showing the bore 23, the gaskets 27a and 27b, and the accommodating portion 13 in the third state, and FIG. 6 is a cross-sectional view showing the gasket 27b and the annular groove 280b in the third state. The projecting portions 274 a and 274 b cooperate with the bottom surface portion 284 to form a closed space between the projecting portions 274 a and 274 b and the bottom surface portion 284. At this time, the tip of the first contact portion 271 of the gasket 27a abuts on the inner wall surface 134a due to the above-described plane-symmetric shape.

  Next, when the bore 23 is further inserted from the third state and Dg is further reduced, the joining inner wall surface 134b presses the first contact portion 271 in the depth direction. By this pressing force, the first contact portion 271, the second contact portion 272, the third contact portion 273, the fifth contact portion 275, and the sixth contact portion 276 move in the depth direction. At this time, each of the second contact portion 272 and the fifth contact portion 275 is compressed by receiving a drag force from the side wall surface 282, and each of the third contact portion 273 and the sixth contact portion 276 is compressed on the side wall surface 283. Compressed in response to drag from Further, each of the projecting portions 274 a and 274 b is compressed by receiving a drag force from the bottom surface portion 284. This state is the fourth state. FIG. 7 is a cross-sectional view showing the gasket 27b and the annular groove 280b in the fourth state.

  Further, since the distance between each of the side wall surfaces 282 and 283 and the center line 300 is gradually narrowed in the depth direction, the second contact portion 272 and the third contact portion 273 after the third state. The fifth contact portion 275 and the sixth contact portion 276 gradually move in the depth direction while being compressed by receiving drag from the side wall surfaces 282 and 283.

  Each of the protrusions 274a and 274b has a length in the groove width direction that decreases in the depth direction. That is, the cross-sectional shape of each of the protrusions 274a and 274b becomes narrower toward the tip. The angles of the tips of the projecting portions 274a and 274b are respectively the first contact portion 271, the second contact portion 272, the third contact portion 273, the fifth contact portion 275, and the sixth contact portion 276. Less than the tip angle. By reducing the contact area of the protrusions 274a and 274b to the bottom surface 28, the surface pressure that presses the bottom surface 28 can be increased by the pressure (restoring force) to return the gasket 27b. Raising the airtightness. Therefore, in the closed space between the projecting portions 274a and 274b, the compression force of the gasket 27b due to the pressing force received by the first contact portion 271 is reduced, and the air pressure is reduced without reducing the surface pressure of the fourth contact portion 274. Maintaining sex.

  Next, when the bore 23 is further inserted from the fourth state and Dg is further reduced, the bonded inner wall surface 134b further presses the first contact portion 271 in the depth direction. With this pressing force, the first contact portion 271, the second contact portion 272, the third contact portion 273, the fifth contact portion 275, and the sixth contact portion 276 move in the depth direction, The contact portion 271 is compressed by receiving a pressing force from the bonded inner wall surface 134b. This state is the fifth state. FIG. 8 is a cross-sectional view showing the bore 23, gaskets 27a and 27b, and the accommodating portion 13 in the fifth state, and FIG. 9 is a cross-sectional view showing the gasket 27b and the annular groove 280b in the fifth state.

  Further, when the joined inner wall surface 134b approaches the gasket 27b in an oblique direction, the frictional force between the joined inner wall surface 134b and the gasket 27b is first contacted between the third state and the fifth state. Works in part 271. In the portion of the gasket 27b that is orthogonal to the direction in which the throttle body 2 is inserted, this frictional force tends to cause a fall. However, in the present embodiment, in the cross section of the gasket 27b orthogonal to the insertion direction of the throttle body 2, the two protruding portions 274a and 274b are arranged so as to be aligned in the insertion direction of the throttle body 2, and as described above, the gasket 27b. The holding force that is held by the bottom surface portion 284 acts to prevent the gasket 27b from falling or rotating due to the frictional force generated during the insertion and the pressing force of the throttle body 2, and the protrusions 274a, 274b and the bottom surface portion 284 The stability between is improved.

  Further, in the attachment process, the bolts 3x and 3y pass through the through holes 29x and 29y, and are respectively fastened to the fixing portions 19x and 19y, whereby the throttle body 2 is fixed to the intake manifold 1. This completes the attachment process.

  By the above attachment process, Dg is minimized, and the gap between the peripheral edge of the inner wall opening 136b and the peripheral edge of the outer wall opening 236b is sealed. Similarly, the gap between the peripheral edge of the inner wall opening 136a and the peripheral edge of the outer wall opening 236a is sealed. Thereby, the intake pipe 12, the bore 23, and the surge tank 16 communicate with each other.

  According to the present embodiment, two projecting portions 274a and 274b that face the bottom surface portion 284 and are aligned in the insertion direction of the throttle body 2 are formed in a portion of the gasket 27b that is orthogonal to the insertion direction of the throttle body 2. Thus, the gasket filling rate of the portion facing the bottom surface portion 284 can be kept low, the pressing force of the first contact portion 271 can be relaxed, and the surface pressure can be appropriately maintained without generating a rotational force. Therefore, according to the present embodiment, it is possible to prevent the intake manifold 1 or the throttle body 2 from being deformed by the pressure to return to the gasket 27b and to prevent the valve clearance from changing. Further, since the tips of the projecting portions 274a and 274b are thin, the surface pressure of the portion in contact with the bottom surface portion 284 is increased, and the sealing performance can be improved.

  By compressing the six portions of the second contact portion 272, the third contact portion 273, the fifth contact portion 275, the sixth contact portion 276, and the protruding portions 274a, 274b in contact with the annular groove 280b, Sealability with the annular groove 280b can be ensured.

  Since the gasket 27b has the same cross section over the entire circumference, variation in rigidity due to the circumferential position of the gasket 27b is suppressed. Thereby, when the bore 23 is inserted into the accommodating portion 13, the gasket 27b is compressed evenly regardless of the position in the circumferential direction. Therefore, the sealing surface formed by the first contact portion 271 is kept flat, and the sealing performance with the bonded inner wall surface 134b is ensured.

  The fifth contact portion 275 and the sixth contact portion 276 may be omitted from the gaskets 27a and 27b. In this case, four locations of the second contact portion 272, the third contact portion 273, and the protruding portions 274a and 274b contact the annular groove 280b.

  In addition to the throttle body, the gasket of the present invention can also be applied to an intake duct connected to the air cleaner side, an inlet pipe connected to the engine, and an exhaust valve assembly that controls the amount of air in the exhaust passage.

  1 intake manifold, 2 throttle body, 3x, 3y bolt, 12 intake pipe, 13 accommodating part, 16 surge tank, 17 minute pipe, 18 injector, 19x, 19y fixed part, 23 bore, 24 shaft, 25 throttle valve, 26 drive Part, 27a, 27b gasket, 29x, 29y through hole, 131 insertion port, 132 cylindrical inner wall surface, 134a, 134b bonded inner wall surface, 136a, 136b inner wall opening, 232 cylindrical outer wall surface, 234a, 234b bonded outer wall surface, 236a, 236b External wall opening, 271 first contact portion, 272 second contact portion, 273 third contact portion, 274 fourth contact portion, 274a, 274b protruding portion, 275 fifth contact portion, 276 sixth contact portion 280a, 280b annular groove , 281 opening, 282, 283 side wall surface, 284 bottom surface portion, 300 center line.

Claims (5)

A gasket attached to a groove formed in the first member and having elasticity to seal between the first member and the second member;
The first contact portion contacting the second member;
A second contact portion that contacts one side wall surface of the groove;
A third contact portion that contacts the other side wall surface of the groove;
A protrusion that is divided into two in the width direction of the groove and protrudes in the depth direction of the groove; and a fourth contact portion in which the tip of each of the two protrusions contacts the bottom surface of the groove; Prepared,
The height of the gasket, which is the length in the depth direction of the gasket, is formed to be greater than the depth of the groove, and the protrusion length of the two protrusions is the height of the gasket and the depth of the groove. Gasket formed to be more than the difference between. The length in the width direction of each of the two protrusions is formed so as to decrease toward the depth direction,
The gasket according to claim 1. A throttle device attached to the intake manifold,
A joint portion having a flat surface facing the joint surface of the intake manifold, an opening communicating with the intake manifold is formed in the flat surface, and an annular groove is formed on the periphery of the opening;
A gasket attached to the groove and having elasticity; a first abutting portion that abuts on a joint surface of the intake manifold; a second abutting portion that abuts on an inner peripheral side wall surface of the groove; A third abutting portion that abuts on the outer peripheral side wall surface and a projecting portion that is divided into two in the width direction of the groove and projects in the depth direction of the groove are formed, and the tip of each of the two projecting portions is the A fourth abutting portion that abuts the bottom surface of the groove, and is formed such that the height of the gasket, which is the length in the depth direction of the gasket, is greater than the depth of the groove, and the two protrusions The protruding length of the portion is formed so as to be equal to or greater than the difference between the height of the gasket and the depth of the groove, and the intake manifold and the opening manifold are sealed by sealing a peripheral edge of the opening of the throttle device mounted on the intake manifold. Open aperture Throttle device and a gasket to be. The length in the width direction of each of the two protrusions is formed so as to decrease toward the depth direction,
The throttle device according to claim 3. The flat surface at the joint is inserted into the intake manifold and formed obliquely with respect to the insertion direction.
The throttle device according to claim 3 or 4.

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