JP2008232039A - Fastening structure for intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of surely fastening and retaining a valve body even in a fastening structure sharing a collar. <P>SOLUTION: This invention relates to a structure fastening and fixing an intake manifold 2 together with a valve 3 on a mounting surface 1a of a cylinder head 1 side by a bolt 8 inserted from a flange part 2a side. The valve 3 is fastened and retained by a housing 6 to seat the valve body 5 inserted in the resin housing 6 on the mounting surface 1a. A metal collar 7 is inserted in a mounting hole 9 of the housing 6 and a projecting seat part 10 is formed on an opening part circumference edge of the mounting hole 9 beforehand. The flange part 2a is fastened together with the housing 6 and the valve body 5 by fastening the bolt 8 to make the projecting seat part 10 flush with an end surface of the collar 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure for fastening an intake manifold in an internal combustion engine, and particularly to a mounting surface on a cylinder head side with a bolt inserted from a flange portion side of the intake manifold together with a valve for opening and closing a port of the intake manifold. The present invention relates to a structure that is fastened and fixed.

  As shown in FIG. 4, when the intake manifold 2 is fastened to the cylinder head 1 of the internal combustion engine by bolting, a swirl control valve is provided between the mounting surface 1a on the cylinder head 1 side and the flange portion 2a on the intake manifold 2 side. In addition, a valve 3 called a tumble control valve may be interposed.

  The tumble control valve 3 opens and closes a valve body 4 (to be described later) by a tumble control motor (not shown), and closes the valve body 4 particularly in a low rotation range to a medium speed rotation range, thereby generating a strong tumble flow (longitudinal swirl flow) in the combustion chamber. ), So that stable combustion can be obtained even when EGR is introduced.

For example, the tumble control valve 3 is obtained by inserting a valve body 5 having a valve body 4 into a resin housing 6 as shown in FIG. 5, and its length C is slightly smaller than the thickness dimension H of the housing 6. The housing 6 is fastened together with the flange 2a by inserting the bolt 8 from the flange 2a side of the intake manifold 2 into the metal collar 7 which is set to be large, and at the same time, the mounting surface 1a and the housing 6 The flange 5a of the valve body 5 is pressed and held so that the valve body 5 is seated on the mounting surface 1a. A fastening structure using such a collar 7 is described in Patent Documents 1 and 2.
JP-A-8-100705 JP 2002-276589 A

  In such a conventional structure, since the collar 7 directly receives the bolt fastening force, both the collar 7 and the housing 6 which are bent by receiving the bolt fastening force have the same height (length) dimension ( Although it is ideal that H = C), the length dimension C of the collar 7 may still be large due to the influence of dimensional variation or the like, both of which do not have the same dimension. In such a case, a gap G is generated between the mounting surface 1a on the cylinder head 1 side and the housing 6. As a result, it is difficult to securely press and hold the valve body 5 and the original tumble control valve 3 is inherently pressed. There is a risk that it will not be possible to fully function.

  The present invention has been made paying attention to such a problem, and provides a structure that can securely hold the valve body even in the fastening structure using the collar as described above. To do.

  The present invention is a structure in which an intake manifold is fixed together with a valve for opening and closing a port of the intake manifold together with a bolt inserted from a flange portion side of the intake manifold to a mounting surface on the cylinder head side. The valve is pressed and held by the housing so that the valve body inserted in the resin housing is seated on the mounting surface, while the housing mounting hole is made of a metal having a bolt hole. When the collar is inserted, a convex seat that protrudes from the end face of the collar is formed in advance on the periphery of the opening on the side of the mounting hole that comes into contact with the flange or the mounting surface. By tightening the bolts until the seat is flush with the collar end face, the flange of the intake manifold forms a valve. Characterized in that together are the housing and the valve body are fastened together.

  In this case, it is desirable that the convex seat is formed in an annular shape around the opening of the bolt hole on the collar side.

  Therefore, in the present invention, by crushing the convex seat portion with a bolt fastening force, the height dimension of the collar and the height dimension of the housing can be made the same after the bolt fastening. Accordingly, the housing is pressed and held between the mounting surface on the cylinder head side and the flange portion of the intake manifold, and at the same time, the valve body is also firmly pressed and held between the mounting surface on the cylinder head side and the housing. Become.

  According to the present invention, since the height of the collar and the height of the housing can be made the same by crushing the convex seat portion with a bolt fastening force, there is a gap between the mounting surface on the cylinder head side and the housing. It does not occur, and the valve body can be securely pressed and held, and its reliability is improved.

  1 to 3 are views showing a more specific embodiment of the present invention. FIG. 1 shows a state before the intake manifold 2 is fastened to the mounting surface 1a on the cylinder head 1 side, and FIG. FIG. 3 shows an enlarged view of a main part, and FIG. 3 shows a state after the intake manifold 2 is fastened to the mounting surface 1a on the cylinder head 1 side with bolts 8. 1 to 3, the same reference numerals are given to the portions common to FIG. 5.

  In this embodiment, the metal collar 7 having the bolt hole 7a is inserted into the mounting hole 9 of the resin housing 6, but the length C of the collar 7 is set to the housing. 6 is set to be slightly larger than the thickness H of the general portion, and the peripheral portion of the opening portion on the side facing the flange portion 2a of the intake manifold 2 in the mounting hole 9 on the housing 6 side where the collar 7 is inserted. An annular convex seat 10 is formed so as to be higher by one step. As shown in FIG. 2, the height m of the convex seat portion 10 is set to protrude slightly larger than the end face of the collar 7. That is, the relationship between the thickness dimension H of the general part of the housing 6 and the length C of the collar 7 and the thickness dimension W + m including the convex seat 10 of the housing 6 is H <C <W + m.

  Therefore, in such a fastening structure, as shown in FIG. 1, the housing 6 in which the valve body 5 is inserted is seated together with the valve body 5 on the mounting surface 1 a on the cylinder head 1 side, and on the opposite surface of the housing 6. With the flange portion 2a of the intake manifold 2 facing each other, the bolt 8 is inserted into the bolt hole 11 on the flange portion 2a side and the bolt hole 7a of the collar 7 previously inserted in the housing 6 as shown in FIG. This is fastened by tightening the screw hole 12 on the cylinder head 1 side.

  In this case, as shown in FIG. 3, the bolt 8 is tightened until the convex seat 10 that has received the bolt fastening force is crushed and the convex seat 10 is flush with the end face of the collar 7. As a result, the housing 6 and the collar 7 are firmly pressed and held between the mounting surface 1 a on the cylinder head 1 side and the flange portion 2 a of the intake manifold 2. Therefore, there is no room for a gap to be generated between the mounting surface 1a and the housing 6 as in the prior art. At the same time, the flange portion 5a of the valve body 5 is firmly fixed by the mounting surface 1a and the shoulder portion 6a on the housing 6 side. Pressed and held.

  As described above, according to the present embodiment, the resin-made housing 6 is pressed and held by crushing the annular convex seat portion 10 so as to be flush with the collar 7, and thus the flange portion of the valve body 5. Since the valve body 5 is seated on the mounting surface 1a by pressing and holding the 5a with the mounting surface 1a and the shoulder portion 6a on the cylinder head 1, the valve body 5 may be loosely held. Therefore, the pressure holding state can be stably maintained for a long time. As a result, the reliability of holding the valve body 5 is increased.

  Here, in the above-described embodiment, the annular convex seat portion 10 is provided in the portion that contacts the flange portion 2a of the intake manifold 2, but is provided on the opposite side, that is, the portion that contacts the mounting surface 1a of the cylinder head 1. However, the same effect can be obtained. Moreover, the convex seat part 10 does not necessarily need to be annular, and for example, a plurality of independent convex seat parts may be formed at a constant pitch on a concentric circle around the opening of the mounting hole 9.

The principal part cross-section explanatory drawing which shows the state before a bolt fastening as embodiment of the fastening structure of the intake manifold which concerns on this invention. The expansion perspective view of the principal part of FIG. FIG. 2 is a cross-sectional explanatory view of a main part showing a state where bolts are fastened from the state of FIG. Schematic explanatory drawing which shows the fastening state of the intake manifold with respect to a cylinder head. It is a figure which shows an example of the conventional fastening structure, and is sectional explanatory drawing of the principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder head 1a ... Mounting surface 2 ... Intake manifold 2a ... Flange part 3 ... Tumble control valve 5 ... Valve body 5a ... Flange part 6 ... Housing 7 ... Collar 7a ... Bolt hole 8 ... Bolt 9 ... Mounting hole 10 ... Convex shape Seat

Claims (2)

The intake manifold is fixed together with the valve for opening and closing the port of the intake manifold together with a bolt inserted from the flange side of the intake manifold to the mounting surface on the cylinder head side.
On the other hand, the valve is pressed and held by the housing so that the valve body inserted in the resin housing is seated on the mounting surface.
When a metal collar having a bolt hole is inserted into the mounting hole of the housing, the peripheral edge of the opening on the side of the mounting hole that comes into contact with the flange portion or the mounting surface protrudes from the end surface of the collar. The convex seat is pre-formed,
The flange of the intake manifold is fastened together with the housing forming the valve and the valve main body by tightening the bolt until the convex seat is flush with the end face of the collar. Intake manifold fastening structure.   2. The intake manifold fastening structure according to claim 1, wherein the convex seat portion is formed in an annular shape around an opening portion of a bolt hole on the collar side.

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