JP2006144555A - Variable intake device of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve secure and easy installation by preventing a seal member mounted in an insertion plate from easily coming off at installation in a surge tank of a valve unit. <P>SOLUTION: In a variable intake device of an engine which is provided with two air chambers formed by partitioning the inside of a surge tank by a partition wall 30A and distributing intake air to two cylinder groups and with a variable intake valve 22 for opening/closing communication between the air chambers by inserting and fixing an insertion plate 21A of a valve unit 2A in a partition wall opening, and in which opening/closing control by a prescribed control means makes an effective intake pipe length variable, the outer peripheral part of the insertion plate 21A is fitted to the fitting groove 25a by boring a pair of upper and lower engaging grooves 211, 212 disposed along the outer periphery on the upper and lower surfaces of the insertion plate 21A and by projecting a pair of engagement hooks 251, 252 whose tips are opposed to both side walls of a fitting groove 25A provided to the inner peripheral surface of a seal member 25A having a shape corresponding to the outer peripheral part of the groove. By so doing, the engagement hooks 251, 252 are engaged with the engaging grooves 211, 212. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a variable intake device, and in particular, an effective tracheal length by controlling opening and closing of a variable intake valve provided in an internal partition wall of a surge tank that temporarily holds intake air sent to an intake manifold connected to each cylinder of an engine. It is related with the variable intake device of the engine which made variable.

  Conventionally, as a means for improving the torque of the engine, a technique using the intake pulsation of the engine is known, which is described in Japanese Utility Model Laid-Open No. 63-156421 and Japanese Patent Laid-Open No. 10-299493, and FIG. As shown in FIG. 4, a partition wall 30B is provided inside the surge tank 1C, and the intake air is divided into two groups for each cylinder where the intake timing is not continuous, and a variable intake valve 22 (power valve) disposed in the partition wall 30B is set to a predetermined value. 2. Description of the Related Art A variable intake device for an engine is known in which an effective intake pipe length can be changed by opening / closing control by a control means.

  For example, in a variable intake device for a V-type engine, as shown in FIG. 5 (A), the effective intake pipe length LL when the variable intake valve 22 is closed in the medium / low speed range condition is the branch of the intake pipe 9. The length is from the separation point 9a to the lower end 9b. On the other hand, as shown in FIG. 5B, the effective tracheal length LH when the variable intake valve 22 is opened in the high speed range condition can be extremely shortened by using only the lower end portion 9b. The effective intake pipe length can be easily changed by opening / closing control.

  The variable intake valve 22 disposed in the partition wall 30A of the surge tank 1B has a valve unit 2B in which the variable intake valve 22 is provided in a mounting portion 30a formed by cutting out the U-shaped from the end of the partition wall 30A. 10 is inserted through the opening 10a on the side wall. As shown in FIG. 6A, the valve unit 2B has a so-called power which is supported by a disc-like valve body 21c that opens and closes a circular communication hole 21b provided in the approximate center of the insertion plate 21B. A variable intake valve 22 that functions as a valve is configured.

  A U-shaped seal member 25B is attached to the outer peripheral portion of the insertion plate 21B of the valve unit 2B to ensure adhesion with the mounting portion 30a of the partition wall 30A. As shown in the cross-sectional view of FIG. 6B, the seal member 25B is provided with a fitting groove 25d for fitting a flange 21d protruding from the outer peripheral surface of the insertion plate 21B on the inner peripheral surface. It is a member made of elastic rubber having a substantially square cross section provided with a flange-shaped fixed convex portion 25c. And the fixed convex part 25c is inserted in the fixed groove | channel 30b provided along the inner periphery from the center of the inner peripheral surface of the attachment part 30a of the partition 30A.

  The valve unit 2B is inserted and attached to the attachment portion 30a of the partition wall 30A through the seal member 25B, so that the surge tank 1B can be changed while maintaining the independence (airtightness) between the two air chambers 31 and 32. Since the intake valve 22 can be disposed, a variable intake device can be created relatively easily. Further, since the valve unit 2B can be easily removed, maintenance of the variable intake valve 22 becomes easy.

  However, when the valve unit 2B is mounted on the surge tank 1B, the seal member 25B is inserted into the insertion plate 21B so that the seal member 25B is inserted when the insertion plate 21B is moved vertically and horizontally. It will be easily detached from the plate 21B, and the installation work becomes troublesome. Further, when the seal member 25B is attached with a part thereof removed, the airtightness by the partition wall 30A cannot be secured, and the variable intake device cannot exhibit a desired function.

In order to solve this problem, Japanese Patent Application Laid-Open No. 2003-3853 discloses that a surge tank and a valve unit insertion plate are respectively molded from resin, and a contact between the partition mounting portion and the insertion plate is formed using an adhesive or a laser. A technique for creating a variable intake device by bonding is proposed. Thereby, the insertion plate of a valve unit can be reliably attached to a partition, and airtightness can be ensured. However, in this case, an adhesive work is required at the time of attachment, resulting in an increase in labor. Further, it becomes difficult to remove the valve unit from the surge tank after the adhesion, and the maintenance work becomes troublesome. .
Japanese Utility Model Publication No. 63-156421 Japanese Patent Laid-Open No. 10-299493 JP 2003-3853 A

  The present invention is intended to solve the above-described problems. When the valve unit is mounted on the surge tank, the sealing member attached to the insertion plate is not easily removed, so that the sealing member can be securely and easily removed. The task is to make it possible to install.

  Therefore, the present invention has two air chambers in which the inside of the surge tank is partitioned by a partition wall and distributes intake air to a group of two cylinders, and an insertion plate for a valve unit having an on-off valve is inserted into the partition wall opening. In the variable intake device of the engine, which is provided with a variable intake valve that opens and closes communication between two air chambers by fixing, and the effective tracheal length can be changed by opening and closing it with a predetermined control means. A pair of upper and lower engagement grooves along the outer periphery with a predetermined interval from the outer edge are formed on the upper and lower surfaces of the insertion plate, and the fitting grooves provided on the inner peripheral surface of the seal member having a shape corresponding to the outer peripheral portion. A pair of engagement rods with opposite ends projecting from both side walls are projected, and the engagement plate engages with the engagement groove by fitting the outer periphery of the insertion plate into the engagement groove. The seal member is fixed to the portion.

  As a result, when the seal member is attached to the outer periphery of the insertion plate and inserted into the surge tank and fixed to the partition wall opening, the seal member cannot be easily detached from the insertion plate. It can be attached to the tank.

  In addition, a fixing groove is provided along the inner peripheral direction on the inner peripheral surface of the mounting portion of the partition wall, and the insertion plate is provided on the outer peripheral surface of the seal member so as to protrude along the outer periphery and be inserted into the fixing groove. If a flange-shaped fixing convex part is provided that closely contacts and fixes the partition wall and the partition wall, the insertion plate can be more stably fixed and the airtightness between the upper and lower air chambers can be further ensured. .

  Furthermore, if the thickness of the base end side of the fixed convex portion in the seal member is made thinner than the central portion and the member is easily swung up and down by applying a force to the tip side thereof, the seal member is attached to the insertion plate. When inserting into the partition wall mounting part with the mounting part fixed, the fixed convex part swings up and down even if the insertion plate is squeezed up and down while the tip of the fixed convex part is inserted into the fixing groove of the mounting part Thus, it is possible to further reduce the concern that the seal member is detached from the insertion plate.

  According to the present invention, when the valve unit is attached to the surge tank, the seal member attached to the insertion plate is not easily removed, and the attachment can be made surely and easily.

  Referring to the drawings, a first embodiment of the present invention will be described. FIG. 1 shows an exploded perspective view of a surge tank 1A including a valve unit 2A constituting a variable intake device of the present embodiment. The casing 10 is shown in a state where the outline is represented by a wavy line and the inside is seen through. Since the basic configuration and operation of the variable intake device are the same as those of the conventional one described above, the description thereof will be omitted, and only the features of the present invention will be described in detail.

  The valve unit 2A includes a variable intake valve 22 connected to a predetermined actuator 27 by a link mechanism, and the actuator 27 is connected to a control device (not shown) so that the drive is controlled to open and close the variable intake valve 22. It has become. The variable intake valve 22 is disposed at a substantially central position of the U-shaped insertion plate 21A, and the insertion plate 21A is inserted from the opening 10a opened on the side surface of the casing 10 of the surge tank 1A, and the seal member 25A is interposed. However, the communication between the two air chambers 31 and 32 can be opened and closed by inserting and fixing to the mounting portion 30a of the partition wall 30A. The shape of the peripheral portion of the insertion plate 21A and the shape of the seal member 25A are characteristic in the present embodiment.

  FIG. 2A is a plan view showing details of the valve unit 2A, and FIG. 2B is a longitudinal sectional view (variable) of the insertion plate 21A to which the seal member 25A is attached and the attachment portion 30a of the partition wall 30A to which this is attached. The intake valve portion is omitted). As shown in the figure, a pair of engaging grooves 211 and 212 along the outer periphery of the insertion plate 21A are formed on both upper and lower surfaces, and a pair of upper and lower engaging rods 251 and 252 having a shape corresponding thereto is provided as a seal member 25A. The fitting groove 25a provided on the inner peripheral surface of the inner wall protrudes from the front end side of both side walls. Further, a flange-like fixed convex portion 25c protrudes from the outer peripheral surface of the seal member 25A over the entire outer periphery, and its tip is inserted into a fixed groove 30b provided on the inner periphery of the mounting portion 30a of the partition wall 30A. It has become.

  Since the seal member 25A is made of rubber and has elasticity, it is relatively easy to engage the engagement rods 251 and 252 with the engagement grooves 211 and 212 and attach them to the outer periphery of the insertion plate 21A. When the seal member 25A is inserted and fixed to the mounting portion 30a of the partition wall 30A in a state where the seal member 25A is mounted on the outer peripheral portion of the insertion plate 21A, the seal member 25A is firmly inserted even if the insertion plate 21A is moved up and down. Since it is fixed to the outer peripheral portion of the plate 21A, it does not easily come off. Further, since the valve unit 2A is not easily detached, the mounting operation of the valve unit 2A to the surge tank 1A becomes extremely easy.

  3 (B) and 3 (C) show a second embodiment of the present invention in which the configuration is different from the combination of the insertion plate 21A and the seal member 25A in FIG. 2 (B), which is the first embodiment of the present invention. The embodiment and the third embodiment are shown, and the longitudinal sectional views of the front end portions where the seal member is mounted on the insertion plate of the valve unit are shown. FIG. 3A shows an insertion plate 21C provided with a corner portion by projecting the central portion of the outer peripheral surface of the insertion plate 21A shown in FIG. 2B, and a sealing member 25C having a shape that closely adheres to this shape. There is shown an embodiment in which the seal member 25C is more firmly fixed against vertical displacement.

  FIG. 3B shows a seal according to an embodiment in which the thickness of the base end portion of the flange in the fixed convex portion 25c of the seal member 25C in FIG. The member 25D is shown. By adopting such a configuration, even when the insertion plate 21C is moved up and down in a state where the distal end of the fixed convex portion 25d is inserted into the fixed groove 30b during insertion into the mounting portion 30a, the distal end side of the fixed convex portion 25d is swung. Since the force can be absorbed by this, it is more resistant to vertical displacement.

  3 (C) shows a combination of the conventional insertion plate 21B and the seal member 25B shown in FIG. 6 (B) with the fixed projection 25c of the seal member 25B and the fixed projection 25d of FIG. 3 (B). A sealing member 25E having the same shape is shown. By doing so, it is possible to improve the difficulty of detachment of the seal member 25E. However, compared with that of FIG. 3B, the fixing force of the seal member 25E with respect to the insertion plate 21B is weak, so the difficulty of detachment is less. Somewhat inferior.

  As described above, according to the present invention in which the engagement structure is provided between the insertion plate of the valve unit attached to the surge tank and the seal member, the movement that bends up, down, left and right when the insertion plate is attached to the attachment portion of the partition wall. Even if there is, it is possible to minimize the fear that the seal member will come off, and this makes the mounting operation extremely easy.

The disassembled perspective view which shows 1st embodiment of this invention. (A) is a top view which shows the detail of the valve unit of FIG. 1, (B) is a longitudinal cross-sectional view which shows the detail of the engagement structure of the insertion plate outer peripheral part and a sealing member. (A) is a longitudinal sectional view showing a second embodiment of the present invention, (B) is a longitudinal sectional view showing a third embodiment of the present invention, and (C) is a fixing of (B) to the conventional example. The longitudinal cross-sectional view which shows the case where a convex part is provided. The layout of the conventional intake system which has arrange | positioned the variable intake device. (A) And (B) is a perspective view for demonstrating the effect | action of a variable intake device. (A) is a top view which shows the detail of the valve unit of FIG. 5, (B) is a longitudinal cross-sectional view which shows the detail of the engagement structure of the insertion plate outer peripheral part and a sealing member.

Explanation of symbols

1A surge tank, 2A valve unit, 9 intake pipe, 9a branching portion, 9b end portion, 10a opening, 21A, 21B insertion plate, 22 variable intake valve, 25A, 25C, 25D seal member, 25a fitting groove, 25c, 25d fixed convex part, 30A partition, 30a mounting part, 30b fixed groove, 31,32 air chamber, 211,212 engaging groove, 251,252 engaging rod

Claims (3)

The inside of the surge tank is partitioned by a partition wall and has two air chambers for distributing intake air to a group of two cylinders, and an insertion plate of a valve unit having an on-off valve is inserted into the partition wall opening and fixed. In a variable intake device for an engine, in which a variable intake valve that opens and closes communication between two air chambers is disposed, and an effective tracheal length can be changed by opening and closing the variable intake valve by a predetermined control means,
A pair of upper and lower engagement grooves along the outer periphery with a predetermined interval from the outer edge are formed in the upper and lower surfaces of the insertion plate, and are provided on the inner peripheral surface of the seal member having a shape corresponding to the outer periphery of the insertion plate. A pair of engagement rods with opposite ends projecting from both side walls of the fitting groove, and the engagement rod is engaged with the engagement groove by fitting the outer peripheral portion of the insertion plate into the fitting groove. In combination, the sealing member is fixed to the outer peripheral portion of the insertion plate,
A variable intake device for an engine characterized by that.   A fixing groove along the inner peripheral direction is provided on the inner peripheral surface of the mounting portion of the partition wall, and the surge tank of the valve unit is projected on the outer peripheral surface of the seal member along the outer periphery and inserted into the fixing groove. The variable intake device for an engine according to claim 1, further comprising a flange-shaped fixing convex portion that allows the insertion plate and the partition wall to be in close contact with each other and fixed in a flush state. The engine according to claim 2, wherein the fixed convex portion of the seal member has a proximal end side thinner than a central portion, and is easily swung up and down by applying a force to the distal end side. Variable intake system.

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