JPS6235867Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention applies to the throttle valve of a throttle system in an internal combustion engine having parallel intake pipes, or the throttle valve of a plurality of carburetors when each pipe is fully closed. The present invention relates to an intake system structure for an internal combustion engine that can eliminate variations in airtightness of valves in the air.

[Conventional technology and its problems]

Conventionally, in order to balance the airtightness of the left and right valves when the valves in the parallel intake pipes are fully closed,
There were problems in that it required a very complicated shape with an adjustment mechanism and required a large space for the connecting part. Another problem was that it was difficult to assemble the connecting members between the shafts for supporting and rotating the valve.

The present invention was made to eliminate such conventional problems, and its purpose is to eliminate the airtightness variation between the left and right valves when fully closed, and to reduce the space required for the connection part.
It is an object of the present invention to provide an intake system structure for an internal combustion engine, which improves the ease of assembling connecting members between shafts for supporting and rotating valves.

[Means for solving problems]

In order to achieve the above object, the present invention has an intake system structure for an internal combustion engine in which a valve and a shaft for supporting and rotating the valve are disposed on the same straight line in each of the parallel intake pipes, and each shaft is In an intake system structure of an internal combustion engine in which the shafts are connected to each other via an elastic material and a rotating means is connected to one of the shafts, the ends of the shafts in opposite directions serve as the means for connecting the shafts. Attach the respective arms to face each other, fix a pin to the opposing surface side of the tip of one arm, and provide a long hole at an equal radius at the tip of the other arm at a position opposite to the pin, The pin is slidably inserted into the elongated hole, and includes means for supporting the tip of the pin by a leaf spring fixed to the other arm.

[Effect]

In such a configuration, the valve supporting/rotating shafts disposed in each intake pipe are connected via an interlocking mechanism including a leaf spring made of an elastic material, so that one valve is in contact with the valve seat and the entire valve is rotated. When the valve is closed, the other valve is pressed against the valve seat by the leaf spring and is fully closed, thereby eliminating variations in airtightness between the two valves.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a throttle housing used in a second throttle section according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

1 and 2, the throttle housing 10 includes intake pipes 12, 14, 16, 1
8, 20, 22, 24, and 26 are provided.
These pipes 14, 16, 22, 24 have valves 2
8, 30, 32, and 34 are arranged. Of these, the valves 28 and 30 are connected to the throttle shaft 3.
6, and the valves 32, 34 are supported by a throttle shaft 38.

The structure of the connecting portion (A in the figure) of the throttle shafts 36 and 38 is shown in FIGS. 3 and 4.
FIG. 3 is a perspective view of the connecting portion, and FIG. 4 is an explanatory diagram of its assembly. Throttle arms 40, 42 are provided at the ends of the throttle shafts 36, 38, respectively.
are installed so that they are facing each other. A pin 44 is fixed to the opposite surface of the distal end of the arm 40. On the other hand, the pin 4 at the tip of the arm 42
4 are provided with elongated holes 46 having equal radii. The pin 44 is inserted into the elongated hole 46 so that it can slide, and the tip of the pin 44 is supported by a leaf spring 50 fixed to the arm 42 by a rivet 48. The leaf spring 5
0 and one end 46a of the elongated hole 46. When inserting the pin 44 into the long hole 46, the pin 44 is inserted by pulling the lower end of the leaf spring 50 toward the end of the long hole 46 opposite to the end 46a.
4 can be easily inserted into the elongated hole 46 and supported, resulting in good assembly performance.

At this time, the valves 28 and 30 are the valve 3.
The arms 40 and 42 are positioned so that they are 1 to 2 degrees further advanced than the arms 2 and 34.

In FIG. 4, reference numerals 52 and 54 are adjusting springs and adjusting screws for positioning when the valve is fully closed. Further, 56 and 58 are holes and bolts for connecting a rod 62 of an actuator 60, which will be described later.

Arm 42 and rod 62 of actuator 60
FIG. 5 shows the connected state. Figure 5 shows
FIG. 1 is a sectional view taken along line FIG. As shown in FIG. 5, one end of the rod 62 is pivotally connected to the arm 42 by a bolt 58, and the other end is connected to a diaphragm mechanism (not shown) disposed within the actuator 60. . This diaphragm mechanism is driven by engine vacuum conveyed through pressure port 64 of actuator 60.

In the embodiment device configured in this way,
When the engine negative pressure transmitted to the actuator 60 is low, the valves 28, 30, 32, 34
are both fully open.

When the negative pressure transmitted to the actuator 60 increases, the rod 62 is pulled in the direction of arrow B, the arms 42 and 40 rotate in the direction of arrow C, and the valve 2
8, 30, 32, and 34 rotate in the closing direction.

When the negative pressure transmitted to the actuator 60 becomes even higher, the valves 28 and 30, which have been set one or two degrees further than the valves 32 and 34, first become fully closed. Thereafter, while the valves 28 and 30 are held down by the leaf spring 50, the other valves 32 and 34 are fully closed.

In this way, the arm 40 starts operating at the same time as the arm 42 due to engine negative pressure acting on the actuator 60, and immediately after the throttle valves 28, 30 are fully closed, the throttle valves 32, 34 are fully closed, and the two-step Keep the valve airtight.

Although the above embodiment relates to a second throttle, the present invention is not limited thereto, and can be applied to throttle valves of a plurality of carburetors, for example.

[Effect of idea]

According to the present invention, the pin at the tip of one arm attached to the end of each shaft for supporting and rotating the valve is inserted into the elongated hole of the other arm, and the tip of the pin is inserted into the long hole of the other arm. Since it is supported by a leaf spring fixed to the arm of the valve, it is easy to insert the pin into the long hole and support it, making it easy to assemble, and also eliminates the airtightness variation between the left and right valves when fully closed. be able to. Furthermore, the space required for the connecting portion is small, making it possible to reduce weight and cost.

[Brief explanation of the drawing]

Fig. 1 is a side view of the throttle housing according to the embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of the connecting part of the throttle shaft, and Fig. 4 is an assembly explanation of Fig. 3. FIG. 5 is a sectional view taken along the line of FIG. 1. 10... Throttle housing, 12, 14,
16, 18, 20, 22, 24, 26... Intake pipe line, 28, 30, 32, 34... Valve, 36,
38... Throttle shaft, 40, 42... Throttle arm, 44... Pin, 46... Long hole,
50... leaf spring, 60... actuator.

Claims (1)

[Scope of utility model registration request] A valve and a shaft that supports and rotates the valve are arranged on the same straight line in each of the parallel intake pipes,
Each shaft is interconnected via an elastic material, and
In an intake system structure of an internal combustion engine in which a rotating means is connected to one of the shafts, arms are attached to opposing ends of each shaft as the means for connecting the shafts, and one of the shafts is connected to the other shaft. A pin is fixed to the opposite surface side of the tip of the arm, a long hole with an equal radius is provided at a position opposite to the pin on the tip of the other arm, and the pin is slidably inserted into the long hole. An intake system structure for an internal combustion engine, comprising means for supporting the tip of the pin by a leaf spring fixed to the other arm.