JP2013124559A - Intake valve device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake valve device for an internal combustion engine capable of reducing the assembling cost of a rotating support shaft and a valve element.SOLUTION: The device includes the rotating support shaft 7 including a cutout surface 10 along the direction of a rotation axis X and provided in such a manner as to cross an intake passage; and the valve element 8 composed of a valve member 6 and a fitting member 12 which can be mutually fitted in such a manner that the outer peripheral surface of the rotating support shaft 7 including the cutout surface 10 is held in contact from the radial direction of the rotation axis X.

Description

  The present invention relates to an intake valve device for an internal combustion engine in which a rotation support shaft provided in a state crossing an intake passage and a valve body attached to the intake passage are assembled in a non-rotating state.

  In the conventional intake valve device, in order to assemble the rotation support shaft and the valve body in a non-rotating state, the rotation support shaft having a rectangular cross section over the entire length, and a rectangular tube-like insertion portion for inserting the rotation support shaft And an elastic piece for pressing and fixing the rotating support shaft inserted into the insertion portion against the valve body is provided in the insertion portion so as to protrude into the insertion path of the rotation support shaft (for example, , See Patent Document 1).

German patent invention No. 102007046230

In the conventional intake valve device, in order to insert the rotation support shaft into the insertion portion and assemble it to the valve body, a special piece for holding the elastic piece in a posture that does not interfere with the insertion operation of the rotation support shaft into the insertion portion. Since a jig or the like is required, the assembly cost of the rotating support shaft and the valve body is likely to increase.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake valve device for an internal combustion engine that can reduce the cost of assembling the rotary support shaft and the valve body.

  The first characteristic configuration of the intake valve device for an internal combustion engine according to the present invention includes a rotary support shaft provided in a state of having a notch surface along the direction of the rotation axis and traversing the intake passage, and the notch surface. A valve member that can be fitted to each other and a valve body that is constituted by a fitting member so as to abut and hold the outer peripheral surface of the rotating spindle from the radial direction of the rotating shaft core.

For this reason, the outer peripheral surface of the rotating support shaft including the notch surface is removed from the radial direction of the rotating shaft core by a simple operation of fitting the fitting member and the valve member to each other without using a special jig. The rotating support shaft and the valve body can be assembled in a non-rotating state by abutting and holding.
Therefore, with the intake valve device for an internal combustion engine having this configuration, it is possible to reduce the assembling cost of the rotary support shaft and the valve body.

  A second characteristic configuration of the present invention is that the rotation support shaft has a circular cross-sectional portion inserted through the valve member.

  Since the circular cross-section portion of the rotation support shaft is inserted through the valve member, it is difficult to cause a twist due to the rotation operation of the rotation support shaft formed with the notch surface.

  The third characteristic configuration of the present invention is that the contact direction of the fitting member with respect to the notch surface and the fitting direction with respect to the valve member are set in different directions.

  With this configuration, even if an external force acting in a direction to separate the fitting member and the notch surface acts, the fitting member and the valve member are difficult to disengage, and the outer peripheral surface of the rotating support shaft is extended for a long time. Can be held in contact with each other.

  According to a fourth characteristic configuration of the present invention, the fitting member is slidably fitted to the valve member, and fitting grooves in which both side portions in the direction of the rotation axis of the fitting member are fitted. The portion is provided in the valve member.

If it is this structure, the both sides in the direction of a rotating shaft core of a fitting member will be slide-fitted to the fitting groove part with which a valve member is provided, and a rotation spindle and a valve body will be assembled in a detent state. be able to.
Therefore, even if an external force in a direction that separates the fitting member and the notch surface acts, the fitting between the fitting member and the valve member is more difficult to come off.

  A fifth characteristic configuration of the present invention is that the rotating support shaft is provided so as to be press-contactable from the radial direction of the rotating shaft core by fitting the fitting member to the valve member.

  If it is this structure, it will be hard to produce looseness between a fitting member and a valve member, and a rotating support shaft, and the outer peripheral surface of a rotating support shaft can be contacted and held over a long period of time.

  According to a sixth characteristic configuration of the present invention, an engagement portion that engages with each other in the retaining direction of the fitting member in a state in which the fitting member is fitted to the valve member, the fitting member and the valve member It is in the point which is prepared over.

  With this configuration, the fitting member can be fitted to the valve member in a positioned state while preventing the fitting member from coming off from the valve member.

It is a disassembled perspective view of an intake manifold. It is a perspective view of an intake manifold. It is a disassembled perspective view of an intake valve device. It is a front view of an intake valve device. It is sectional drawing of a valve body, (a) is sectional drawing in alignment with the direction parallel to a rotation spindle, (b) is sectional drawing along the direction orthogonal to a rotation spindle. It is the VI-VI sectional view taken on the line in FIG. It is sectional drawing of the valve body in 2nd Embodiment, (a) shows the state before fitting a fitting member, (b) shows the state which fitted the fitting member. It is a disassembled perspective view of the intake valve apparatus in 3rd Embodiment. It is sectional drawing of the valve body in 3rd Embodiment, (a) is sectional drawing in alignment with the direction parallel to a rotation spindle, (b) is sectional drawing along the direction orthogonal to a rotation spindle.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 and 2 show an intake manifold B of an automotive four-cylinder diesel engine (an example of an internal combustion engine) equipped with an intake valve device (hereinafter simply referred to as an intake valve device) A for an internal combustion engine according to the present invention.
The intake manifold B is assembled between a throttle body (not shown) and an intake port of a cylinder head of the engine.

The intake manifold B includes a resin intake manifold 1 and a resin cartridge 2 joined to an intake port connection surface of a cylinder head (not shown).
The cartridge 2 is formed with a port joint surface 3 that is joined to an intake port connection surface of a cylinder head (not shown) with a gasket 3 a interposed therebetween, and the cartridge 2 is joined to the intake manifold 1 with the port joint surface 3 facing outward. ing.

In the cartridge 2, a plurality (eight in this embodiment) of intake passages 4 and 40 for supplying air (intake air) in the intake manifold 1 to respective cylinders in the engine are formed so as to be arranged in the horizontal direction.
The intake manifold 1 includes a throttle body mounting portion 5 and is formed in a substantially bilaterally symmetric shape with the lateral width expanding toward the cartridge 2 with respect to the center line of the throttle body mounting portion 5.

The cartridge 2 is formed horizontally and symmetrically with an outer peripheral wall 2a joined to the intake manifold 1 and seven partition walls 2b that divide the inner periphery of the outer peripheral wall 2a into eight intake passages 4, according to the present invention. An intake valve device A is equipped.
As shown in FIG. 4, each intake passage 4 has a semicircular arc-shaped wall surface portion that connects the left and right parallel wall surface portions 4a facing each other in parallel with each other and the upper and lower edges of the parallel wall surface portion 4a. It is formed in a shape surrounded by 4b.

  The intake valve device A includes four resin valve bodies 8 attached to each of the four intake passages 4 of the eight intake passages 4 and 40, and the intake passages 4 extending from the intake passages 4 to the parallel wall portions 4 a. A stainless steel rotating support shaft 7 provided in a series in a state crossing from a direction orthogonal to the direction of rotation, and an electric motor M for opening and closing the valve bodies 8 integrally by driving and rotating the rotating support shaft 7 forward and backward. I have.

Each valve body 8 is mounted at an intermediate position in the longitudinal direction of the passage inside the intake passage 4, and as shown in FIGS. 3 and 4, left and right parallel side edges 8a and parallel side edges 8a facing each other in parallel. And a semicircular arc edge portion 8b that connects the upper edges and the lower edges of each other, and adjusts the amount of air taken into the engine cylinder.
The valve body 8 is formed in a curved surface shape in which both surfaces protrude in series in the direction along the parallel side edge portion 8a so as to reduce the pressure loss of the intake air passing through the intake passage 4 while being held in the open posture. ing.

  In order to assemble the rotation support shaft 7 and the valve body 8 in a non-rotating state, the rotation support shaft 7 has a flat notch surface 10 along the direction of the rotation axis X as shown in FIGS. A semicircular cross-sectional portion 7a formed and a circular cross-sectional portion 7b not formed with the notch surface 10 are provided.

  The notch surface 10 is formed so that four portions corresponding to each valve body 8 of the series of shaft members having a circular cross-section that is a component material of the rotary support shaft 7 and can be obtained at low cost have a semicircular cross-section. It is formed by cutting out with a constant width along the direction of the rotation axis X at the same position in the direction.

  The valve body 8 and the valve member 6 that can be fitted to each other so that the outer peripheral surface of the rotary shaft 7 including the notch surface 10 can be held in contact with the valve body 8 from the radial direction of the rotary shaft X. A fitting member 12 is provided.

A pair of circular cross-section portions 7b in which the notch surface 10 is not formed in the rotating support shaft 7 are formed so as to penetrate the left and right sides of the valve member 6 along a direction perpendicular to the left and right parallel side edges 8a. A circular shaft hole 9 is rotatably inserted.
Each shaft hole 9 opens to a boss 8c formed integrally with each of the parallel side edge portions 8a.

As shown in FIG. 4, the boss 8 c keeps the distance d between the valve body 8 in the closed posture and the inner surface of the intake passage 4 constant over the entire circumference by contact with the parallel wall surface portion 4 a of the intake passage 4. .
The rotation support shaft 7 is inserted into the shaft hole 9 of each valve member 6 in a state of passing through the outer peripheral wall 2a and each partition wall 2b, one end side is supported by the outer peripheral wall 2a, and the other end side is driven and rotated by the electric motor M. Is done.

  The valve member 6 has a fitting groove 11 for fitting the fitting member 12 so as to come into contact with the notch surface 10 in a surface contact state at the center position in the width direction where the parallel side edges 8a face each other. The parallel side edge 8a is formed in parallel.

The fitting groove 11 has a flat groove bottom surface 11a. The groove bottom surface 11a is formed with a shaft insertion groove 17 that allows the semicircular cross-sectional portion 7a of the rotary shaft 7 to be inserted so that the cut surface 10 is flush with the groove bottom surface 11a.
The support shaft insertion groove 17 has a semicircular groove shape, and is formed so as to cross the longitudinal intermediate position of the groove bottom surface 11a over the entire width.

  The fitting groove 11 has the groove bottom surface 11a along the center position in the thickness direction of the valve body 8, one end side opens to the one arc edge 8b side, and the other end is orthogonal to the parallel side edge 8a. In a shape closed by the end surface 11b along the direction of the rotation, the shape is formed parallel to the parallel side edge 8a, that is, along the direction orthogonal to the rotation support shaft 7.

  As shown in FIG. 5, the fitting groove 11 has a narrow groove portion 13a and a wide groove portion 13b forming the groove bottom surface 11a, and both sides of the wide groove portion 13b are recessed in both sides in the width direction than the narrow groove portion 13a. The fitting member 12 is provided so as to be slidably fitted from one arcuate edge portion 8b side.

As shown in FIG. 5, the fitting member 12 includes an outer surface 12 a that is a part of the outer surface of the valve body 8 in a state of being fitted in the fitting groove 11, and a flat fitting bottom surface 12 c that is in surface contact with the groove bottom surface 11 a. And.
The fitting member 12 is formed in a shape in which the upper side in the fitting direction forms one arc edge 8b, and includes a contact surface 12b that comes into contact with the end surface 11b of the fitting groove 11 on the lower side in the fitting direction. ing.

  The fitting member 12 includes a narrow fitting portion 14a fitted into the narrow groove portion 13a and a wide fitting portion 14b fitted into the wide groove portion 13b so that the fitting bottom surface 12c comes into surface contact with the groove bottom surface 11a. Are formed in a convex cross-sectional shape provided in parallel with each other with the wide fitting portion 14b protruding from both sides of the narrow fitting portion 14a.

Both side portions 15 in the axial center direction of the rotation support shaft 7 of the fitting member 12 are configured by portions protruding to both sides in the width direction from the narrow fitting portion 14a of the wide fitting portion 14b. .
The fitting groove 11 includes a fitting groove portion 16 in which the both side portions 15 are fitted in series.
The fitting groove portion 16 is configured by a portion of the wide groove portion 13b that is recessed on both sides in the width direction with respect to the narrow groove portion 13a.

  Therefore, as shown in FIG. 3, the fitting direction is such that the contact direction of the fitting member 12 with respect to the notch surface 10 and the fitting direction of the fitting member 12 with respect to the valve member 6 are different from each other. A joint groove 11 and a fitting member 12 are provided.

As shown in FIG. 5B, the fitting member 12 and the valve member 6 are engaged with each other in the retaining direction of the fitting member 12 with the fitting member 12 fitted in the fitting groove 11. An engaging portion 18 is provided across the fitting member 12 and the valve member 6.
The engaging portion 18 includes a concave surface portion 18a formed so as to be spherically recessed into the groove bottom surface 11a and a convex surface portion 18b formed so as to protrude spherically from the fitting bottom surface 12c of the fitting member 12. It is provided to engage.

A procedure for assembling the valve body 8 to each intake passage 4 will be described.
A valve member 6 is temporarily assembled in each intake passage 4, and the rotary support shaft 7 is arranged from one end side of the cartridge 2 so that the notch surface 10 is flush with the groove bottom surface 11 a of the fitting groove 11. 6 is inserted.
Next, by fitting the fitting member 12 into the fitting groove 11 until the contact surface 12b contacts the terminal surface 11b, the fitting member 12 is brought into surface contact with the notch surface 10 so that the valve body 8 is moved. The rotary spindle 7 is assembled to each intake passage 4 in a non-rotating state.

[Second Embodiment]
FIG. 7 shows another embodiment of the present invention.
In the present embodiment, the support shaft insertion groove 17 is formed at a depth slightly shallower than the radius of the circular cross-section portion 7 b of the rotation support shaft 7, and the fitting member 12 is fitted to the valve member 6, thereby rotating the rotation support shaft. The shaft 7 is provided so as to be press-contactable from the radial direction of the rotation axis X.

That is, as shown in FIG. 7A, the semicircular cross-sectional portion 7a of the rotary support shaft 7 enters the support shaft insertion groove 17 so that the notch surface 10 protrudes from the groove bottom surface 11a of the fitting groove 11, As shown in FIG. 7 (b), the notch surface 10 is pressed by the fitting member 12 fitted in the fitting groove 11 so as to get over the semicircular cross-section portion 7a, and the fitting member 12 is pushed to the notch surface 10. The surface is pressed against the surface.
Other configurations are the same as those of the first embodiment.

[Third Embodiment]
8 and 9 show another embodiment of the present invention.
In the present embodiment, as shown in FIG. 8, the contact direction of the fitting member 12 with respect to the notch surface 10 and the fitting direction of the fitting member 12 with respect to the valve member 6 are set to be the same direction. is there.

That is, as shown in FIG. 9A, a rectangular fitting groove 11 having a groove side surface 11c and a flat groove bottom surface 11a orthogonal to the groove side surface 11c facing each other in parallel with each other is provided as a valve member 6. Formed on one side surface.
The fitting groove 11 is formed in parallel to the parallel side edge portion 8a at the center position in the width direction where the parallel side edge portions 8a face each other so that both end portions open to the arc edge portion 8b. The support shaft insertion groove 17 is formed across the entire width of the groove bottom surface 11a.

The fitting member 12 has a constant width including an outer surface 12a that becomes a part of the outer surface of the valve body 8 in a state of being fitted in the fitting groove 11, and a flat fitting bottom surface 12c that is brought into surface contact with the groove bottom surface 11a. Is formed.
In a state where the fitting member 12 is fitted to the fitting groove 11 from the direction perpendicular to the groove bottom surface 11a, the fitting member 12 and the valve member 6 are engaged with each other in the retaining direction of the fitting member 12. Engaging portions 18 are provided across the fitting member 12 and the valve member 6 at two positions sandwiching the support shaft insertion groove 17.

The engaging portion 18 includes a locking member 19 projecting from the fitting bottom surface 12c of the fitting member 12, and a locking hole formed through the valve member 6 on the groove bottom surface 11a side in a direction perpendicular to the groove bottom surface 11a. 20.
The locking member 19 includes a pair of locking shafts 19b each having a locking claw 19a at the tip thereof, with the locking claw 19a being opposite to each other and spaced apart from each other.
The locking hole 20 is provided with a step portion 21 that forms a small-diameter portion 20a that opens to the groove bottom surface 11a side and a large-diameter portion 20b that opens to the outer surface side of the valve body 8 and engages the locking claw 19a. It is.

  Therefore, the fitting member 12 is fitted in the state in which the rotary support shaft 7 is inserted into each valve member 6 from one end side of the cartridge 2 so that the notch surface 10 is flush with the groove bottom surface 11a of the fitting groove 11. As the groove 11 is fitted from the direction perpendicular to the groove bottom surface 11a, the pair of locking shafts 19b enter the small-diameter portion 20a while being elastically deformed in a direction close to each other.

Then, as shown in FIG. 9B, the engagement bottom surface 12c comes into surface contact with the notch surface 10 and the groove bottom surface 11a, and the engagement claw 19a is pulled out of the large diameter portion 20b. The fitting member 12 is fixed to the valve member 6 in a state where the fitting member 12 is brought into surface contact with the notch surface 10 by being locked to the step portion 21 by the return deformation.
Other configurations are the same as those of the first embodiment.

[Other Embodiments]
1. In the intake valve device for an internal combustion engine according to the present invention, the outer peripheral surface of the rotary shaft 7 including the notch surface 10 is obtained by fitting all or part of the fitting member 12 into a fitting hole formed in the valve member 6. May be configured to contact and hold from the radial direction of the rotation axis X.
2. The intake valve device for an internal combustion engine according to the present invention may be one in which the rotation support shaft 7 is not inserted into the valve member 6.

  The intake valve device for an internal combustion engine according to the present invention can be used for intake valve devices for various internal combustion engines such as gasoline engines.

4 Intake passage 6 Valve member 7 Rotating support shaft 7b Circular section 8 Valve body 10 Notch surface 12 Fitting member 15 Side portion 16 Fitting groove portion 18 Engaging portion X Rotating shaft core

Claims (6)

A rotation support shaft provided with a notch surface along the direction of the rotation axis and provided across the intake passage;
A valve member configured to be fitted to each other and a valve body configured to be fitted so that the outer peripheral surface of the rotation support shaft including the cutout surface is in contact with and held from the radial direction of the rotation shaft core. An intake valve device for an internal combustion engine.   The intake valve device for an internal combustion engine according to claim 1, wherein the rotary support shaft has a circular cross-sectional portion inserted through the valve member.   The intake valve device for an internal combustion engine according to claim 1 or 2, wherein a contact direction of the fitting member with respect to the notch surface and a fitting direction with respect to the valve member are set to be different from each other.   The fitting member is slidably fitted to the valve member, and the valve member includes a fitting groove portion in which both side portions in the direction of the rotation axis of the fitting member are fitted. An intake valve device for an internal combustion engine according to claim 3.   The intake air of the internal combustion engine according to any one of claims 1 to 4, wherein the rotary support shaft is press-contactable from a radial direction of the rotary shaft core by fitting the fitting member to the valve member. Valve device.   An engagement portion that engages with each other in the retaining direction of the fitting member in a state in which the fitting member is fitted to the valve member is provided across the fitting member and the valve member. The intake valve device for an internal combustion engine according to any one of claims 1 to 5.

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