JPH0531234Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a throttle coupling mechanism for an internal combustion engine (hereinafter referred to as engine).

(Prior Art) As shown in FIGS. 5A to 5C, the throttle connection mechanism of a conventional engine has one end of a lever 22 fixed to one end of a throttle shaft 21 that rotatably holds a throttle valve (not shown). 22
A pin 23 is rotatably attached to the other end via a washer 24, a rod 26 is inserted through a rod hole 25 provided in the pin 23, and is fixed to the pin 23 by a set screw 27. In this way, the throttle shaft 21 is connected to the lever 2.
2. They are connected by a rod 26 via a pin 23, and are rotated uniformly by moving the rod 26 in its axial direction, and this rotation opens and closes the throttle valve.

However, the conventional connection mechanism for the throttle shaft 21 has the following drawbacks.

(a) Since the rod 26 is fixed to the pin 23 by the set screw 27, the rod 26 has little freedom in its axial movement. Further, since the rod 26 is assembled to the throttle shaft 21 with the throttle fully open, the perpendicularity of the lever 22 to the shaft 21 is different. As a result, the locus of rotation of the rod hole 25 in the rod axis direction is shifted. When I close the throttle again, the rod becomes 26.
An unreasonable force is applied to the rod, causing the rod etc. to deform and malfunction.

(b) The structure is complex, and the processability and productivity are poor.
Therefore, the cost is high.

In addition, as the prior art material of this application,
There is a publication number 46041.

(Problems to be Solved by the Invention) The object of this invention is to provide a throttle connection mechanism that has a simple structure and can smoothly open and close a throttle valve.

(Means for Solving the Problems) In order to solve the above problems, this invention provides a throttle connection mechanism that opens and closes the throttle valves disposed in each of the multiple rows of intake pipes of the throttle housing in conjunction with each other. A lever is fixed to the throttle shaft of each throttle valve, a pin is attached to each lever, and a support for connecting each pin is slidable at a position corresponding to each pin. Snaps made of resin with good properties are placed by press-fitting, and the pins are loosely inserted into each snap.

(Function) Since the support is connected to each lever via a snap and a pin, the axial movement of the support is smoothly transmitted to the lever, and each lever opens and closes the throttle valve via the corresponding throttle shaft. do.

(Description of Examples) This invention will be explained below with reference to FIGS. 1 to 4 showing examples. The throttle housing 1 is provided with a plurality (four in this embodiment) of parallel intake pipes 2 to 5, each of which is connected to a primary port 2.
a to 5a, and secondary ports 2b to 5b. A throttle valve 6 is accommodated in each of the secondary ports 2b to 5b, and each throttle valve 6 is fixed to a throttle shaft 7 rotatably installed horizontally in the secondary ports 2b to 5b, and rotates with the shaft 7. move. A part of each throttle shaft 7 is the throttle housing 1
It protrudes outward, and levers 8 and 9 are fixed to its protruding ends. The lever 8 is attached to the throttle shaft 7 of the secondary port 2b located at the front end (the left end in FIG. 1), and the lever 9 is attached to each throttle shaft 7 of the secondary ports 3b, 4b, and 5b and rotates integrally with the shaft 7. Possibly installed. Pin holes 8a and 9a are provided at one ends of the levers 8 and 9, respectively. Lever 8,9
As shown in FIG. 2, when the throttle valve 6 is fully open, it comes into contact with a stopper 10 attached to the throttle housing 1. The support 11 is provided with a snap hole 11a that faces the pin holes 8a and 9a of the levers 8 and 9 when the levers 8 and 9 are in contact with the stopper 10. A snap 12 made of resin is press-fitted. The pin 13 is inserted into the pin holes 8a and 9a.
It is loosely inserted into the snap 12 and is prevented from coming off by an E-ring 14.

A negative pressure actuator 15 is attached to the throttle housing 1 and is operated by negative pressure in the intake pipe of the engine. The actuator 15 has a negative pressure chamber and an atmospheric chamber separated by a diaphragm, and the negative pressure chamber communicates with a negative pressure generating section of the intake pipe of the engine. Rod 1 on the diaphragm
One end of the rod 16 is fixed, and the other end of the rod 16 is provided with a pin hole 16a for inserting the pin 13. On the other hand, a snap hole 8b is provided at the other end of the lever 8, and a snap 12 is press-fitted into the snap hole 8b in the same manner as described above. As shown in FIG.
is attached, and this pin 13 is loosely inserted into the snap 12 and is prevented from coming off by an E-ring 14.

In the above configuration, when the intake pipe negative pressure introduced into the actuator 15 from the engine intake pipe is low, the rod 16 of the actuator 15 moves forward;
As shown in FIG. 1, all throttle valves 6 are fully open, and the other ends of the levers 8 and 9 are at the stopper
is in contact with. When the negative pressure in the intake pipe increases, the rod 16 moves backward and the throttle valve 6 is moved through the support 11, levers 8, 9, and throttle shaft 7.
rotates in the direction of closing. When the intake pipe negative pressure becomes higher than a certain value, the throttle valve 6 is fully closed.

During this series of opening and closing operations of the throttle valve 6, the support 11 is connected to the levers 8 and 9 via the snap 12 and the pin 13, so that the levers 8 and 9 are rotated by the actuation of the actuator 15, and the rotation thereof is controlled. The support oscillates smoothly.

(Effects of the invention) According to this invention, unlike the conventional connection mechanism using a set screw, it is not necessary to process a rod hole and a screw hole for the pin 13, so that the structure can be simplified.

In addition, since the pin attached to the lever is loosely inserted into a resin snap with good sliding properties that is press-fitted into the support, the rotation of the lever and the swinging of the support accompanying the rotation are prevented. becomes smooth,
As a result, the throttle valve can be opened and closed smoothly.

[Brief explanation of the drawing]

FIG. 1 shows a side view of the secondary valve of one embodiment. FIG. 2 shows a plan view of FIG. FIG. 3 shows an enlarged view of the main part of FIG. 1. FIG. 4 shows an exploded perspective view of the components of this invention. 5A to 5B show a conventional throttle coupling mechanism, in which A shows a side view, B shows a sectional view taken along the line A-A of A, and C shows an enlarged view of B. 1... Throttle housing, 2, 3, 4, 5
...Intake pipe line, 6...Throttle valve, 7...
Throttle shaft, 8, 9...Lever, 11...
...Support, 12...Snap, 13...Pin.

Claims (1)

[Scope of utility model registration request] In a throttle connection mechanism that opens and closes throttle valves arranged in multiple rows of intake pipes in a throttle housing, a lever is fixed to the throttle shaft of each throttle valve, and a pin is attached to each lever. are attached to each pin, and resin snaps with good sliding properties are press-fitted at positions corresponding to each pin on one support for connecting each pin, and each pin is connected to each snap. Throttle connection mechanism loosely inserted into each.