JP4152275B2 - Multiple throttle body - Google Patents

Description

  The present invention relates to a multiple throttle body to which a plurality of throttle valves for opening and closing an intake passage of a multi-cylinder internal combustion engine (hereinafter referred to as a multi-cylinder engine) is mounted, and particularly, formed by a mold using an aluminum material or the like. This relates to the multiple throttle body.

  In a multi-cylinder engine, a conventional multiple throttle body forming a part of an intake system is formed by integrally forming two adjacent intake passages with a partition wall therebetween and orthogonal to the two intake passages. A bearing hole is formed in two outer walls and two partition walls on both outer sides, and two throttle valves are supported in the bearing hole through a throttle shaft so as to be opened and closed. This throttle body has a structure in which a partition region that separates two intake passages is completely filled with a molding material (see, for example, Patent Document 1).

Further, as a conventional multiple throttle body, a pair of substantially annular walls defining two intake passages, a connecting wall connecting the upper and lower regions of the pair of annular walls, and both ends of the intake passage in the axial direction A region corresponding to the partition wall that separates the two intake passages from each other, and is hollowed so as to penetrate in the axial direction of the intake passage, and bearing holes of the respective annular walls facing the cavity Is completely separated (see, for example, Patent Document 2).
JP-A-8-218904 Japanese Patent Publication No. 7-49781

  By the way, in a conventional throttle body having a partition wall filled with a molding material, generally, after the throttle body 1 is molded by a mold or the like, as shown in FIG. , 1b ′, drills T, T ′ are respectively arranged on both sides in order to process the outer wall 1a and the partition wall 1b on both sides, and one bearing hole 1a ′ is formed by one drill T as shown in FIG. A method is employed in which the two bearing holes 1a ′ and 1b ′ are processed with the other drill T ′.

  However, in this method, as shown in FIG. 7B, since the machining allowance of the other drill T ′ is long, the entire machining time becomes long and the production efficiency is low. Further, since the length of the bearing hole 1b ′ in the partition wall 1b is determined by the interval (pitch) between the two intake passages, the bearing length cannot be adjusted. Since this bearing length greatly affects the durability of the throttle shaft, an adjustable structure is desired.

  On the other hand, in a conventional throttle body having a cavity between two intake passages, the cavity is formed so as to penetrate in the axial direction of the intake passage. On the other hand, in the structure where the thickness is completely reduced, the mechanical strength of the portion supporting the throttle shaft is reduced, and the shaft center between the separated bearing holes is caused by thermal deformation of the annular wall. There is a risk of misalignment easily.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to increase the bearing length while ensuring mechanical strength in a multiple throttle body molded by a mold or the like. An object of the present invention is to provide a multiple throttle body that can be adjusted, can reduce the machining time when machining the bearing hole, can extend the tool life, and can improve productivity.

  In the multiple throttle body of the present invention, a plurality of intake passages are integrally defined by molding, and a through hole through which a throttle shaft that supports a plurality of throttle valves that open and close the intake passage is passed is formed by machining. In the type throttle body, the partition wall between the intake passages is partially cut out from one side in a direction intersecting the axial direction of the intake passage in a region where the throttle shaft is passed The part is provided with a configuration.

According to this configuration, when the through hole is machined by a drill or the like so as to penetrate the plurality of intake passages after the throttle body is formed by a mold or the like, the partition wall between the intake passages is not thinned. Since the part is formed, the machining allowance can be shortened only in the area of the lightening part compared with the case where the lightening part is not provided, and therefore the processing time can be shortened and the life of a tool such as a drill can be shortened. It can be extended and productivity can be improved.
In addition, the thinned portion is thinned only from one side in a direction intersecting the axial direction of the intake passage, so that mechanical strength is ensured as compared with the case where it is completely hollowed so as to penetrate. Thus, it is possible to suppress or prevent the axial holes from being displaced due to external force or thermal deformation between the through-holes facing each other with the thinned portion interposed therebetween.
In addition, since the thinned portion is thinned in a direction intersecting the axial direction of the intake passage (for example, a perpendicular direction), even if the intake passage is relatively long, the length is restricted. The meat can be easily removed without being cut.
Further, by appropriately setting the size of the lightening portion, the length of the through hole processed on both sides thereof (the bearing length when the through hole is directly used as a bearing hole) is set to a desired length. Can be adjusted.

The said structure WHEREIN: The structure which is formed so that the thinning part may demarcate the space which stores a lubricant is employable.
According to this configuration, when the through hole is used as a bearing hole through the throttle shaft, a lubricant (for example, lubricating oil, grease, etc.) can be supplied from the thinned portion, and the lubricant is accumulated in that region. Therefore, maintenance becomes easy.

The said structure WHEREIN: The structure which provided the sealing member which closes a thinning part is employable.
According to this configuration, since the intake passage generally has a negative pressure, it is possible to prevent external air or dust from being sucked into the intake passage through the through hole from the thinned portion.

In the above configuration, the seal member may include a rubber seal that is fitted to the lightening portion and a presser plate that is detachably attached to press the rubber seal.
According to this configuration, the rubber seal is fitted and sealed in the lightening portion, and the rubber seal is pressed and fixed from the outside with the presser plate, whereby the seal is perfectly performed, while the presser plate is removed. Thus, replacement work of the rubber seal or the like can be easily performed.

The said structure WHEREIN: The structure by which the lightening part is formed so that it may have a level | step-difference part which positions a rubber seal is employable.
According to this configuration, since the pushing amount of the rubber seal is regulated by the step portion, the rubber seal can be easily assembled without worrying about the fitting margin, and the productivity is improved.

  As described above, according to the multiple throttle body of the present invention, in a part of the region through which the throttle shaft of the partition wall separating the intake passage is passed, the direction intersects the axial direction of the intake passage and from one side. By providing a die cut part, the machining time when machining the through hole with a drill or the like can be shortened, the life of a tool such as a drill can be extended, and the mechanical strength can be secured. Axial misalignment between through-holes can be prevented, and the size of the through-holes to be processed on both sides (bearing length) can be set to a desired length by appropriately setting the size of the thinned portion can do.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 6 show an embodiment of a multiple throttle body according to the present invention. FIG. 1 is a plan view, FIG. 2 is a longitudinal sectional view of a partition wall taken from the center, and FIG. FIG. 4 is a cross-sectional view of the body body cut along the plane passing through the intake passage, FIG. 4 is a view showing processing of the through-hole, FIG. 5 is a cross-sectional view showing a state in which the throttle shaft S and a plurality of throttle valves V are incorporated, FIG. FIG. 4 is an exploded perspective view showing a seal member.

As shown in FIGS. 1 to 3, the multiple throttle body is a body body 10 formed of a mold using an aluminum material or the like, and as a seal member attached to the body body 10 as shown in FIG. Rubber seal 20, presser plate 30, screw 40 and the like.
The body body 10 is formed between the substantially cylindrical passage walls 11 and 12 that define two intake passages 11a and 12a corresponding to two cylinders of the engine, and between the passage wall 11 and the passage wall 12, and connects the two. At the same time, the partition wall 13 that separates the intake passages 11a and 12a, the thinned portion 14 formed in the partition wall 13, the projection 15 formed in the vicinity of the thinned portion 14, and a through hole processed by a drill after molding Bearing holes 11b, 11c, 12b, 12c, mounting holes 16, 17 for attaching the injectors, screw holes 18 for screwing screws 40, and the like.

  As shown in FIGS. 1 and 2, the two intake passages 11a and 12a are formed so that their axial directions L are parallel to each other at a predetermined interval, and the bearing holes 11b, 11c, 12b, 12c is formed by penetrating the passage walls 11 and 12 and the partition wall 13 so as to be aligned in a straight line in a direction H perpendicular to the axial direction L.

As shown in FIGS. 1 to 3, the partition wall 13 is formed between the passage wall 11 and the passage wall 12 so as to integrally connect the passage walls 11 and 12. In the center region (a part) of the portion through which the throttle shaft S passes, a thinned portion 14 is formed.
As shown in FIGS. 1 and 2, the lightening portion 14 partially punches the partition wall 13 from one side (upper side in FIG. 2) in the vertical direction M intersecting the axial direction L of the intake passages 11 a and 12 a. By doing so, the circular cutout portion 14a having a circular cross section, the rectangular cutout portion 14b having a rectangular cross section narrower than the circular cutout portion 14a, and the boundary between the circular cutout portion 14a and the rectangular cutout portion 14b are positioned. It is shaped so as to demarcate the stepped portion 14c.

Here, as shown in FIGS. 2 and 5, the rectangular thinned portion 14 b has a bottom section whose diameter is larger than the bearing holes 11 c and 12 c (11 b and 12 b) to be processed, that is, the throttle shaft S. Is formed in a semicircular shape that is larger than the outer diameter (the diameter that does not contact when the throttle shaft S is assembled).
Further, the rectangular hollow portion 14b is formed deeper (higher) than the bearing holes 11c and 12c, and a lubricant such as grease and lubricating oil can be stored in this region (space). . Therefore, after passing the throttle shaft S through the bearing holes 11b, 11c, 12b, and 12c, lubricant such as lubricating oil and grease accumulated in the thinned portion 14 (rectangular thinned portion 14b) is gradually added to the bearing holes 11c and 12c. Therefore, maintenance is easy.

Thus, by providing the hollow portion 14 (14b) with respect to the partition wall 13, the length of the bearing holes 11c and 12c can be shortened compared with the case where the hollow portion is not hollowed, and the machining allowance when drilling is performed. Therefore, machining time can be shortened, drill life can be extended, and productivity can be improved.
That is, when processing the bearing holes 11b, 11c, 12b, and 12c, as shown in FIG. 4 (a), drills T and T 'are arranged on both sides of the body body 10 thus molded, and FIG. As shown in FIG. 5, the drills T and T ′ on both sides are fed by the same stroke and processed to reach the area of the thinned portion 14. As a result, since the drills T and T ′ on both sides only need the same machining time, the machining time of the drill on one side is not increased as in the prior art, and the machining time as a whole can be shortened. Productivity will be improved.
Here, by appropriately setting the size of the thinned portion 14 (width in the H direction of the rectangular thinned portion 14b), the length of the bearing holes 11c and 12c processed on both sides thereof is adjusted to a desired length. can do.

  Further, as shown in FIG. 2, the thinned portion 14 is thinned only from one side (upper side in FIG. 2) in the vertical direction M with respect to the axial direction L of the intake passages 11a and 12a. The mechanical strength can be ensured as compared with the case of complete cavitation so as to penetrate through. Therefore, it is possible to suppress or prevent the axial misalignment or the like from occurring between the through holes 11c and 12c facing each other with the thinned portion 14 therebetween due to external force or thermal deformation.

  Further, as shown in FIGS. 1 to 3, the thinned portion 14 is thinned in the vertical direction M intersecting the axial direction L of the intake passages 11 a and 12 a, so that the intake passages 11 a and 12 a are compared. Even when the intake passages 11a and 12a are long (when the intake passages 11a and 12a are long, it is impossible to perform die cutting in the axial direction L as in the prior art), the meat can be easily cut without being restricted by the length. it can.

The body 10 is provided with a seal member that covers the region of the lightening portion 14. That is, as shown in FIG. 6, the seal member is arranged to press the rubber seal 20 from the outside of the cylindrical rubber seal 20 fitted to the circular cutout portion 14 a of the cutout portion 14, and screw It is formed by a presser plate 30 fastened by 40.
Here, assembling is performed by first fitting the rubber seal 20 to the circular cutout portion 14a and then fastening the presser plate 30, but the rubber seal 20 is positioned by the stepped portion 14c, and the pushing amount thereof is restricted. It can be assembled easily without worrying about the fitting allowance. Further, since the holding plate 30 has a through hole 31 through which the screw 40 passes and a U-shaped cutout portion 32 positioned by the projection 15, it can be easily positioned and fixed (fastened). .

Thus, by providing the sealing member (rubber seal 20 and presser plate 30) that closes the thinned portion 14, the negative pressure in the intake passages 11a and 12a causes the thinned portion 14 toward the bearing holes 11c and 12c. External air or dust can be prevented from being sucked.
On the other hand, when the lubricant is insufficient, the screw 40 is loosened and the presser plate 30 and the rubber seal 20 are removed, whereby the lubricant can be injected and maintenance can be easily performed.

Next, the assembly procedure of the multiple throttle body will be described. First, after the body body 10 is molded so as to form the thinned portion 14, the bearing holes 11b, 11c, 12b, 12c are machined. Can be opened.
Then, as shown in FIG. 5, with respect to the processed body 10, the throttle shaft S is passed through the bearing holes 11 b, 11 c, 12 b and 12 c so as to be disposed in the intake passages 11 a and 12 a. In addition, the throttle valve V is fixed to the throttle shaft S with screws or the like, and ring seals (not shown) or the like are fitted to both ends of the bearing holes 11b and 12b.

Thereafter, a lubricant such as grease is injected from the lightening portion 14 and a predetermined amount of excess lubricant is stored in the space above the rectangular portion 14b, and a rubber seal 20 is fitted so as to close the rectangular lightening portion 14b. The presser plate 30 is disposed so as to compress the rubber seal 20 from above and positioned by the protrusion 15, and the screw 40 is fastened (fixed) to the screw hole 18.
Thus, by providing the thinned portion 14 in a part of the region where the throttle shaft S is passed through the partition wall 13, the bearing holes 11 c and 12 c formed in the partition wall 13 can be easily lubricated. Agents can be injected.

In the above embodiment, the case where the through hole machined in the body 10 is used as the bearing holes 11b, 11c, 12b, and 12c that directly support the throttle shaft S has been shown, but the present invention is not limited to this. In a configuration in which a separate bearing is fitted into the through hole and the throttle shaft S is supported by this bearing, the lightening portion according to the present invention can be applied.
Further, in the above-described embodiment, the case where the thinned portion 14 is die-cut in the direction M perpendicular to the axial direction L of the intake passages 11a and 12a is shown, but intersects with the axial direction L of the intake passages 11a and 12a. The case where the die is cut in a slightly inclined direction is included in the scope of the present invention.

In the above embodiment, the case where the two intake passages 11a and 12a are integrally defined as the plurality of intake passages has been described. However, the present invention is not limited to this, and three or more intake passages are integrated. In addition, the lightening portion according to the present invention can be applied to a body body that is defined in a specific manner.
Furthermore, in the said embodiment, although the rubber seal 20 and the presser plate 30 were shown as a sealing member, it is not limited to this, Applying the lid | cover which fits outside, and the sealing member which makes another shape. Can do. Moreover, as the lightening part 14, although the shape which has the circular thinning part 14a and the rectangular thinning part 14b was employ | adopted, it is not limited to this, Other shapes can be employ | adopted.

  As described above, the multiple throttle body of the present invention can be mounted on a multi-cylinder engine or a four-wheeled vehicle mounted on a two-wheeled vehicle as long as a plurality of intake passages are integrally defined by molding. It is preferably used for a multi-cylinder engine, a multi-cylinder engine mounted on a snowmobile, a leisure vehicle or the like, and a multi-cylinder engine used for other general-purpose machines.

1 is a plan view showing an embodiment of a multiple throttle body according to the present invention. It is the longitudinal cross-sectional view which cut | disconnected the multiple throttle body shown in FIG. 1 in the center of a partition. FIG. 2 is a cross-sectional view of the multiple throttle body shown in FIG. 1 cut along a horizontal plane passing through each intake passage. The procedure for machining a through hole (bearing hole) with respect to the body body will be described. (A) is a longitudinal sectional view showing a state before machining, and (b) shows a state after machining is completed. It is a longitudinal cross-sectional view. It is a cross-sectional view showing a state in which a throttle shaft and a throttle valve are incorporated into a machined body body. It is a disassembled perspective view which shows the sealing member which covers a meat extraction part. In the conventional multiple throttle body, a procedure for machining a through hole (bearing hole) is described, (a) is a longitudinal sectional view showing a state before machining, and (b) is completed machining. It is a longitudinal cross-sectional view which shows the state which carried out.

Explanation of symbols

10 Body bodies 11, 12 Passage walls 11a, 12a Intake passages 11b, 11c, 12b, 12c Bearing holes (through holes)
13 Bulkhead 14 Thinning portion 14a Circular thinning portion 14b Rectangular thinning portion 14c Stepped portion 15 Protrusion 18 Screw hole 20 Rubber seal (seal member)
30 Presser plate (seal member)
40 Screw L Axial direction M of intake passage Vertical direction (direction intersecting the axial direction)
S Throttle shaft V Throttle valve

Claims (5)

A multiple throttle body that defines a plurality of intake passages integrally by molding, and forms a through hole through which a throttle shaft that supports a plurality of throttle valves that open and close the intake passages is formed by machining,
The partition wall between the intake passages is provided with a cutout portion partially cut out from one side in a direction intersecting the axial direction of the intake passage in a region where the throttle shaft is passed. ing,
This is a multiple throttle body. The lightening portion is formed so as to define a space for storing a lubricant,
The multiple throttle body according to claim 1. Provided with a seal member covering the meat removal portion,
The multiple throttle body according to claim 1 or 2. The seal member includes a rubber seal that is fitted to the lightening portion, and a presser plate that is detachably attached to press the rubber seal.
The multiple throttle body according to claim 3. The lightening part is formed to have a step part for positioning the rubber seal.
The multiple throttle body according to claim 4.

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