JP2014202167A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake manifold capable of easily externally inserting a bearing to a shaft through change of a simple structure.SOLUTION: A manifold body 12 has a common partition wall 12b positioned between mutually adjacent branch passages 14. In the partition wall 12b, a first insertion hole 21 to which a shaft 32 is loosely fitted is formed. In a peripheral wall 12a of the branch passage 14, a pair of second insertion holes 22 to which a cylindrical bearing 40 supporting the shaft 32 is press-fitted are formed. In the shaft 32, a taper part 32a of which the outer peripheral surfaces of both end parts are formed into a tapered shape is formed.

Description

  The present invention relates to an intake manifold for an internal combustion engine.

  An intake manifold for supplying intake air to each cylinder is provided in the intake passage of the multi-cylinder internal combustion engine, and this intake manifold has a branch passage that branches off corresponding to each cylinder.

  Conventionally, an intake control valve is provided in each branch passage of the intake manifold (see, for example, Patent Document 1). A common shaft is inserted into each branch passage through a plurality of insertion holes formed in the manifold body of such a conventional intake manifold, and a valve body is provided on this shaft. These insertion holes include a first insertion hole formed in a common partition located between adjacent branch passages and a pair of second insertion holes formed in the peripheral wall of the branch passage. An actuator is connected to one end of the shaft. When the shaft is rotated by this actuator, the opening degree of the intake control valve is changed. In an internal combustion engine equipped with such an intake manifold, the flow rate of intake air is increased by changing the opening of the intake control valve and reducing the cross-sectional area of the intake control valve at low engine speeds, thereby generating a tumble flow in each cylinder. Can do.

Japanese Utility Model Publication No. 63-171623

  By the way, the inventor considers a configuration in which a bearing such as a bearing is closely fitted in the pair of second insertion holes, and the shaft is rotatably supported by the bearing, while the shaft is loosely fitted in the first insertion hole. It was. However, in this case, when the bearings are tightly fitted to the pair of second insertion holes, the axis lines of the bearings may be shifted from each other, which causes a problem that it is difficult to insert the shafts into the bearings.

  An object of the present invention is to provide an intake manifold capable of easily extrapolating a bearing to a shaft through a simple configuration change.

  An intake manifold for achieving the above object includes a manifold body having a plurality of branch passages, a shaft inserted into a plurality of insertion holes formed in the manifold body, and a valve body provided on the shaft. And a valve. The manifold main body has a common partition located between adjacent branch passages, and the plurality of insertion holes include a first insertion hole formed in the partition and in which a shaft is loosely fitted, and a branch passage. A pair of second insertion holes formed in the peripheral wall and into which a cylindrical bearing that supports the shaft is closely fitted, and at least one of the outer peripheral surface of the shaft end and the inner peripheral surface of the end of the bearing on the branch passage side Is formed with a guide portion for guiding the shaft into the bearing.

  According to this configuration, when the bearing is inserted into the second insertion hole from the outside of the peripheral wall of the manifold body in a state where the shaft is inserted into the first insertion hole, the outer peripheral surface of the end of the shaft and the branch passage side The shaft is guided into the bearing through a guide portion formed on at least one of the inner peripheral surfaces of the end portions of the bearing.

  According to the present invention, the bearing can be easily extrapolated with respect to the shaft through a simple configuration change.

The front view of the intake manifold of one Embodiment. The perspective view centering on the flange of the intake manifold of the embodiment. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. Sectional drawing along line 4-4 in FIG. Sectional drawing along line 5-5 in FIG. FIG. 5 is a cross-sectional view corresponding to FIG. 4, showing a state where the shaft is inserted through the first insertion hole and the shaft is not inserted through the second insertion hole. Sectional drawing along line 7-7 in FIG. Sectional drawing centering on the front-end | tip of a bearing and a shaft in the middle of the press injection of a bearing. It is a figure corresponding to Drawing 8, Comprising: Sectional drawing centering on a tip of a bearing and a shaft in the middle of press fitting of a bearing in a modification. It is a figure corresponding to FIG. 7, Comprising: Sectional drawing of the intake manifold centering on the 1st insertion hole in another modification. It is a figure corresponding to FIG. 7, Comprising: Sectional drawing of the intake manifold centering on the 1st insertion hole in another modification.

Hereinafter, an embodiment of the intake manifold will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the intake manifold 10 is for a horizontally opposed four-cylinder internal combustion engine, and the manifold main body 12 is formed with two branch passages 14 in total, two on one side. The manifold body 12 is assembled to the cylinder head 50 via the flange 16. In FIG. 2, only the tips of the two branch passages 14 on one side are shown.

  As shown in FIG. 4, the manifold body 12 has a pair of peripheral walls 12 a of the branch passage 14 and a common partition wall 12 b located between the branch passages 14 adjacent to each other. A plurality of insertion holes 21 and 22 are formed in the manifold body 12. A first insertion hole 21 having a polygonal cross section, which will be described later in detail, is formed in the partition wall 12b. Each peripheral wall 12a is formed with a pair of second insertion holes 22 having a circular cross section, and a cylindrical bearing 40 is press-fitted, that is, tightly fitted into each second insertion hole 22. A cylindrical shaft 32 extending along the arrangement direction L of the two branch passages 14 on one side is inserted into each bearing 40 and the first insertion hole 21, and the shaft 32 is rotatably supported by each bearing 40. ing. A shaft 32 is loosely fitted in the first insertion hole 21.

  The length of the bearing 40 is longer than the length of the second insertion hole 22, and the end of the bearing 40 on the branch passage 14 side projects into the branch passage 14 in a state where the bearing 40 is attached to the second insertion hole 22. ing.

The length of the shaft 32 is shorter than the distance between the pair of second insertion holes 22. An output shaft 36 of the actuator is connected to one end of the shaft 32.
A plate 60 is fixed to the outer surface of the peripheral wall 12 a on the distal end side of the shaft 32 by screws 62. The plate 60 prevents the bearing 40 from moving outward. An annular plate 64 is fixed to the outer surface of the peripheral wall 12 a on the proximal end side of the shaft 32 by screws 62. An output shaft 36 of the actuator is inserted through the center hole of the plate 64. The plate 64 prevents the bearing 40 from moving outward.

The shaft 32 of the present embodiment is formed with a tapered portion 32a whose outer peripheral surfaces at both ends are tapered.
As shown in FIG. 3, a valve body 34 is attached to the shaft 32 of each branch passage 14, and the intake control valve 30 is configured by the shaft 32 and the valve body 34.

  As shown in FIGS. 2 and 3, when the shaft 32 is rotated by the actuator, the opening degree of the intake control valve 30 is changed. For example, when the valve element 34 is in the posture indicated by a two-dot chain line in FIG. 3 during low rotation of the internal combustion engine, only the narrow passage 19 defined by the partition wall 18 in the branch passage 14 is opened. For this reason, the intake air flows into the intake port 52 through the narrow passage 19 and the flow velocity of the intake air is increased. Therefore, a tumble flow can be generated in each cylinder even when the internal combustion engine rotates at a low speed.

  FIG. 4 shows the intake manifold 10 in a state where the valve body 34 is not attached to the shaft 32. After the shaft 32 is assembled to the manifold body 12, the valve body 34 is assembled to the shaft 32.

  As shown in FIG. 4, when the shaft 32 is assembled to the manifold body 12, a work table (not shown) in which the manifold body 12 is in a posture in which the flange 16 is directed downward in the vertical direction (hereinafter simply referred to as an assembly posture). Placed on the top.

  As shown in FIG. 5, a pair of inclined surfaces 26 are formed on the lower surface in the vertical direction of the first insertion hole 21 in the assembled posture. The pair of inclined surfaces 26 has a V-shaped cross-section perpendicular to the central axis C of the shaft 32. In other words, the pair of inclined surfaces 26 are positioned so as to be positioned higher in the vertical direction as they are separated from the central axis C in the direction of the axis 32 of the shaft 32, that is, the direction orthogonal to the arrangement direction L and the deviation direction R along the horizontal direction. It is inclined to. Accordingly, the pair of inclined surfaces 26 function as a restricting portion that restricts the displacement of the shaft 32 in the departure direction R. The shaft 32 is loosely fitted in the first insertion hole 21, and a gap G is formed between the shaft 32 and the inclined surface 26. Note that the upper surface in the vertical direction of the first insertion hole 21 in the assembly posture is a flat surface along the horizontal direction, and the first insertion hole 21 has a vertically asymmetric shape.

Next, the assembly procedure of the intake manifold 10 and the operation of the intake manifold 10 will be described with reference to FIGS.
As shown in FIG. 6, first, the manifold body 12 is placed in the assembly posture and placed on the work table. Next, the shaft 32 is inserted from the one second insertion hole 22 into the first insertion hole 21. At this time, the shaft 32 is in contact with the inclined surface 26 of the first insertion hole 21 by its own weight, and is positioned at the center of the deviation direction R.

Next, the bearings 40 are press-fitted into the second insertion holes 22 from the outside of the peripheral wall 12 a of the manifold body 12.
At this time, as shown in FIG. 8, since the tapered portions 32 a are formed at both end portions of the shaft 32, when the bearing 40 is press-fitted into the second insertion hole 22, the tapered portion 32 a becomes the end of the bearing 40. The shaft 32 is gradually guided into the bearing 40 while being in contact with the inner peripheral surface of the part.

  Further, as shown in FIG. 7, since the vertical lower surface of the first insertion hole 21 is a pair of inclined surfaces 26, as shown by solid lines in FIG. 7, with respect to both ends of the shaft 32. When the bearing 40 is extrapolated, the inclined surface 26 restricts the shaft 32 from being displaced in the deviation direction R, that is, the shaft 32 deviating from the center position in the deviation direction R.

As a result, as shown in FIG. 4, the bearing 40 is suitably extrapolated to both ends of the shaft 32.
Thereafter, the plates 60 and 64 are attached to the outer surface of the peripheral wall 12 a of the manifold body 12, and the output shaft 36 of the actuator is connected to the proximal end of the shaft 32. Further, a valve body 34 is attached to the shaft 32.

According to the intake manifold according to the present embodiment described above, the following effects can be obtained.
(1) The shaft 32 is formed with a tapered portion 32a whose outer peripheral surfaces at both ends are tapered. For this reason, when the bearing 40 is press-fitted into the second insertion hole 22 from the outside of the peripheral wall 12 a of the manifold body 12 in a state where the shaft 32 is inserted into the first insertion hole 21, the taper portion 32 a of the bearing 40. The shaft 32 is gradually guided into the bearing 40 while being in contact with the inner peripheral surface of the end. Therefore, the bearing 40 can be easily extrapolated to both ends of the shaft 32 through a simple configuration change.

  (2) A pair of inclined surfaces 26 for restricting displacement in the deviation direction R are formed on the lower surface in the vertical direction of the first insertion hole 21 in the assembly posture. According to such a configuration, the bearing 40 is easily inserted into both ends of the shaft 32 while the bearing 40 is press-fitted into the second insertion hole 22 in a state where the displacement of the shaft 32 in the deviation direction R is restricted.

The intake manifold according to the present invention is not limited to the configuration exemplified in the above-described embodiment, and can be implemented as, for example, the following forms appropriately modified.
As shown in FIG. 9, the inner peripheral surface of the end portion of the bearing 140 on the branch passage 14 side may be a tapered portion 142 whose diameter is reduced as the distance from the branch passage 14 increases. In this case, as shown in the figure, even when the tapered portion is not formed on the outer peripheral surface of the end portion of the shaft 132, when the bearing 140 is press-fitted into the second insertion hole 22, the end portion of the shaft 132 becomes the tapered portion. It is gradually guided to the inside of the bearing 140 while being abutted against 142. Therefore, the effect according to the effect (2) of the above embodiment can be achieved.

  The shape of the restricting portion is not limited to the above embodiment. In addition, for example, as shown in FIG. 10, the restricting portion of the first insertion hole 221 can be configured by a surface 226 having a U-shaped cross section.

  As shown in FIG. 11, a recess 328 can be formed on the lower surface 326 of the first insertion hole 321 in the vertical direction, and the restricting portion of the first insertion hole 321 can be configured by the step of the recess 328. .

・ The shaft can be a prism. Moreover, the length of the shaft can be made longer than the distance between the pair of second insertion holes.
The present invention is not limited to the intake manifold of a horizontally opposed four-cylinder engine, but can be applied to a six-cylinder engine, an eight-cylinder engine, or the like. The present invention can also be applied to a V-type engine or an in-line engine.

  DESCRIPTION OF SYMBOLS 10 ... Intake manifold, 12, 212, 312 ... Manifold body, 12a ... Perimeter wall, 12b, 212b, 312b ... Partition, 14 ... Branch passage, 14a ... Opening, 16 ... Flange, 18 ... Partition wall, 19 ... Narrow passage, 21 221, 321 ... first insertion hole, 22 ... second insertion hole, 26 ... inclined surface (regulation part), 30 ... intake control valve, 32, 132 ... shaft, 32a ... taper part (guide part), 34 ... valve Body 36 ... Output shaft 40,140 Bearing (bearing) 50 ... Cylinder head 52 ... Intake port 60 ... Plate 62 ... Screw 64 ... Plate 142 ... Tapered part 226,326 ... Surface 328 ... concave.

Claims (7)

In an intake manifold comprising: a manifold body in which a plurality of branch passages are formed; an intake control valve having a shaft inserted in a plurality of insertion holes formed in the manifold body and a valve body provided on the shaft;
The manifold body has a common partition located between adjacent branch passages,
The plurality of insertion holes are formed in the partition wall so that the shaft is loosely fitted, and a pair of second holes formed in the peripheral wall of the branch passage and in which a cylindrical bearing supporting the shaft is closely fitted. An insertion hole, and
A guide portion for guiding the shaft to the inside of the bearing is formed on at least one of the outer peripheral surface of the end portion of the shaft and the inner peripheral surface of the end portion of the bearing on the branch passage side.
Intake manifold. The guide portion is a tapered portion whose outer peripheral surface of the shaft is tapered.
The intake manifold according to claim 1. The guide portion is a tapered portion whose diameter is reduced as the inner peripheral surface of the end of the bearing on the branch passage side is separated from the branch passage.
The intake manifold according to claim 1 or 2. The bearing protrudes into the branch passage,
The length of the shaft is equal to or less than the distance between the pair of second insertion holes.
The intake manifold according to any one of claims 1 to 3. On the lower surface in the vertical direction of the first insertion hole in a posture in which the shaft is assembled to the manifold body, the displacement of the shaft in the deviation direction along the horizontal direction is a direction orthogonal to the axial direction of the shaft. A regulation part to regulate is formed,
The intake manifold according to any one of claims 1 to 4. The restricting portion is configured by a surface that is inclined so as to be positioned upward in the vertical direction as the distance from the central axis of the shaft in the departure direction is increased.
The intake manifold according to claim 5. The restricting portion is configured by a pair of flat surfaces in which a cross-sectional shape orthogonal to the axial direction of the shaft forms a V shape.
The intake manifold according to claim 6.