JPH0729247Y2 - Inlet switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an intake port switching device capable of switching an air intake port to both an outdoor side and a vehicle interior side.

In the "prior art" off-road traveling minivan or the like, the position of the air inlet of the air cleaner from the body of the structure is constrained, for example, as shown in FIG. 4, the passenger compartment R ₁ and underfloor R ₂
The intake port 3 was set in the lower part of the body panel 1 that separates the car. For this reason, the structure is such that the phenomenon of water absorption easily occurs during traveling such as a place where water is accumulated.

In order to avoid such a problem, if an intake port is provided at the rear of the driver's seat as employed in, for example, a truck, the noise for intake is noisy and usually exceeds an allowable limit.

For this reason, in a vehicle of this type, usually, a first intake pipe 5 having an intake port 3 provided outside the vehicle and a second intake pipe 6 communicating with the intake port 4 on the vehicle interior R ₁ side are provided together. Then, a switching device 7 for joining the intake pipes 5 and 6 in a state of being orthogonal to each other is arranged in the underfloor R ₂ , and an operation rod 8 and a switching lever 9 for switching the intake ports 3 and 4 according to the running condition of the vehicle. And were set up.

FIG. 5 shows the detailed structure of the conventional switching device 7.

The device shown in the figure has the first intake pipe 5 and the second intake pipe 6
And a housing 12 in which the other side portion is in communication with the intake pipe body 11, and a shutter movably supported by a bracket 13 fixed inside the housing 12 via a fulcrum pin 14. 15 and one end of the bracket 13
And a compression coil spring 16 having the other end connected to the rotating end of the shutter 15, and the lower end of the operating rod 8 is connected to the rear surface of the shutter 15.

At the raised position of the operation rod 8, the shutter 15 contacts the valve seat portion 6a of the second intake pipe 6 and is held in the closed state by the spring pressure of the spring 16.

Further, if the switching lever 9 is operated from this state and the operation rod 8 is pushed down, the shutter 15 is rotationally displaced, and the shutter 15
Contacts the valve seat portion 5a of the first intake pipe 5 and closes it. In this closed state, the line segment connecting both fixed ends of the spring 16 crosses the fulcrum pin 14 which is the center of rotation of the shutter 15 and the biasing force is reversed to press the shutter 15 toward the first intake pipe 5 side. Then, the first intake pipe 5 is held in the closed state.

However, the switching device 7 having such a structure has the technical problems described below.

<< Problems to be Solved by the Invention >> That is, in the switching device 7 having the above structure, the relative position between the rotation angle of the shutter 15 and the valve seat portions 5a and 6a of the end faces of the intake pipes 5 and 6 is simply determined. Depending on the relationship, one is closed and the other is open, so if the fulcrum position of the shutter 15 or the position or angle of the intake pipes 5, 6 deviates even a little, the shutter 15 and the valve seat surfaces 5a, 6a of the intake pipes 5, 6a It was difficult to make the surface pressure uniform with the above, and it was difficult to keep the sealing property stable due to variations in manufacturing.

This invention solves the above-mentioned drawbacks, and it is possible to make uniform the surface pressure on the valve seat portion in the switching closed state of the shutter of this kind of switching device, and to keep the sealing property stable. An object is to provide a mouth switching device.

<Means for Solving the Problems> In order to achieve the above object, the present invention is directed to a first intake pipe provided outside the vehicle, a second intake pipe communicating with the vehicle interior, and first and second intake pipes. A housing that joins the pipes in an orthogonal state and communicates with the intake pipe main body side, an arm rotatably disposed in the housing, and a swingably connected end of the arm that opens into the housing. An intake switching shutter facing both valve seats of the intake pipes, a shutter switching operation rod having one end coupled to the arm and the other end projecting toward the passenger compartment, and the operation rod. A closing spring that reverses the urging direction according to the rotational displacement of the arm due to the operation of the rod and presses and urges the shutter toward one of the valve seat portions; and the arm and the shutter. Is interposed between the shutter and the arm. The present invention provides a device for switching an intake port, which is provided with a second spring that holds a counter angle and is set to be smaller than the spring pressure of the spring.

<< Operation >> According to the above configuration, since the shutter is swingably provided with respect to the arm, the relative angle between the rotation position of the arm and the valve seat surface of the intake pipe does not accurately match. Also,
The shutter contacts the valve seat portion of one of the intake pipes in a state where the shutter is self-corrected to make the surface pressure uniform by the spring pressure of the closing action spring, and keeps the surface pressure uniform.

During the rotation of the arm, the shutter is rotationally displaced by the urging force of the second spring while the angular posture of the shutter with respect to the arm is kept constant. At this time, since the urging pressure of the second spring is set to be smaller than the spring pressure of the closing spring, it does not affect the self-correcting action of the shutter when it is in contact with the valve seat portion.

<< Embodiment >> An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 20 is a lower housing, 22 is an upper housing that is flange-joined to the upper opening of the lower housing 20, and 24 is a partition plate that is sandwiched and fixed to the flange-joining surfaces of both housings 20 and 22.

A first intake pipe 26, which is opened to the outside of the room, is integrally provided on one side of the lower housing 20, and a protruding end of the intake pipe 26 in the housing serves as a lower valve seat portion 26a for closing.

An intake pipe body 28 communicating with an air cleaner (not shown) is integrally connected to the other side of the lower housing 20.

At the upper end of the upper housing 22, a second intake pipe 30 that communicates with the inside of the vehicle compartment (not shown) is integrally and vertically projected, and an operating rod 32 is arranged to penetrate therethrough.

An upper valve seat portion 24a is formed in an opening at approximately the center of the partition plate 24. A switching mechanism is provided on the partition plate 24.

This switching mechanism is rotatably pivotally supported by a bracket portion 34 provided on the upper end side of the partition plate 24 and a fulcrum pin 36 on the bracket portion 34, and passes through the upper valve seat portion 24a. It is provided with a V-shaped arm 38 and a shutter 42 which is provided at the lower end of the upper valve seat portion 24a and which is swingably held via a pin 40 at the rotating end of the arm 38. A lower end of the operating rod 32 is coupled to the arm 38, and one end of the closing rod spring 46 is rotatably connected to the other upper end of the partition plate 24 via a pin 44. The other end of the pin
It is connected through 48.

Further, a second spring, that is, both ends of a small coil spring 50 are connected between the arm 38 and the shutter 42.

The closing coil spring 46 reverses the urging direction according to the rotational displacement of the arm 38 accompanying the operation of the operating rod 32, and presses the shutter 42 toward one of the valve seat portions 24a and 26a. The operation rod 32 is for urging, as shown in the figure.
2A, the upper surface of the shutter 42 is pressed and urged toward the upper valve seat portion 24a so that the widths of both ends of the spring 46 can be expanded to the dimension A, as shown in FIG. 2A.

When the arm 38 is rotated toward the lower side from this state as shown in FIG. 2 (b), the widths of both ends of the spring 46 are contracted to the minimum size B, and when the minimum size B is exceeded, the width is further increased. When the arm 38 rotates, the arm 38 tries to expand again by using this as an inflection point in relation to the radius of rotation, and the arm 38 is rapidly biased toward the lower side.

As a result, the lower surface of the shutter 42 provided at the tip of the arm 38 contacts and closes the lower valve seat portion 26a, and in this state, the maximum C dimension (approximately A dimension) is obtained as shown in FIG. 2 (c). The spring pressure urged the shutter 42 in the closing direction by the spring pressure in the state of being expanded to the spring pressure equal to.

Conversely, when the operation rod 32 is pulled up and the arm 38 is rotated upward, the biasing direction of the spring 46 changes with the minimum dimension B as an inflection point, and the upper valve seat portion 24a rapidly.
Is urged toward the upper side, the shutter 42 is urged against the upper valve seat portion 24a.

When the shutter 42 closes the valve seat portions 24a and 26a, the spring pressure of the spring 46 causes the shutter 42 to move to the pin 40.
The valve seats 24a, 26a are self-corrected so that the surface pressures on the valve seats 24a, 26a are averaged, and each valve seat 24a, 26a has sufficient sealing properties.
One of them will be closed.

The small coil spring 50 is for keeping the angular posture of the shutter 42 with respect to the arm 38 constant, and is shown in FIG.
A small spring pressure is applied so as to bias the posture of the shutter 42 to a slightly vertical side during the rotation.

If the spring 50 is not provided, the shutter 42 tries to maintain the horizontal position during rotation, and as a result, as shown in FIG. 3, the shutter 42 comes into contact with the lower valve seat portion 26a in an oblique position and seals. This is because the inconvenience occurs.

Further, since this spring force is set to be extremely smaller than the spring pressure of the closing spring 46, either one of the valve seat portions
When the shutter 42 contacts the 24a and 26a, it does not hinder the self-correction action.

For example, as shown in FIG. 2 (a), the shutter 42 has an upper valve seat portion.
In the state where it is in contact with 24a, a slight tensile load is applied to the spring 50, and in the state where the shutter 42 is in contact with the lower valve seat portion 26a as shown in FIG. Is applied with no load or with a small compression load, which is negligible compared with the spring pressure of the closing spring 46.

<< Advantages of the Invention >> As described in detail with reference to the embodiments above, the intake port switching device according to the invention has the following effects.

Even if the relative angle between the pivot position of the arm and the joint sealing surface of the intake pipe does not accurately match, the shutter is self-corrected by the spring pressure of the closing spring to make the surface pressure uniform. By contacting the valve seat portion of the intake pipe to keep the surface pressure uniform, it is possible to eliminate the unstable state of the seal due to manufacturing variations.

Since the shutter is rotationally displaced while the angular posture of the arm is kept constant, it is possible to eliminate the inconvenience caused when the shutter is swingably provided at the tip of the arm.

[Brief description of drawings]

FIG. 1 is a sectional view showing an intake port switching device according to the present invention, FIGS. 2 (a) to 2 (c) are explanatory views showing an operation at the time of switching, and FIG. 3 is a state without a second spring. FIG. 4 is an explanatory view showing an inconvenience, FIG. 4 is an explanatory view showing an intake switching structure of a bongo type one-box car, and FIG. 5 is a sectional view showing a conventional intake switching device. 20 …… Lower housing 22 …… Upper housing 24a …… Upper side valve seat 26 …… First intake pipe, 26a …… Lower side valve seat 28 …… Intake pipe body 30 …… Second intake pipe 32 ...... Operating rod 38 ...... Arm 42 ...... Shutter 46 ...... Close winding spring 50 ...... Small winding spring (second spring)

Claims (1)

[Scope of utility model registration request] 1. A first intake pipe provided outside the vehicle, a second intake pipe communicating with the vehicle interior, and first and second intake pipes are joined in an orthogonal state and communicated with the main body of the intake pipe. Housing to
An arm rotatably disposed in the housing, and an intake switching shutter that faces both the valve seat portion of each intake pipe that is swingably connected to the tip of the arm and that opens into the housing. , A shutter switching operation rod, one end of which is connected to the arm and the other end of which protrudes into the vehicle interior, and the biasing direction is reversed according to the rotational displacement of the arm accompanying the operation of the operation rod. A closing spring for pressing and urging the shutter toward one of the valve seat portions, and a relative angle between the shutter and the arm that is interposed between the arm and the shutter, and An intake port switching device, comprising: a second spring set to be smaller than a spring pressure of the spring.