JPH0723555Y2 - Multiple-slot throttle device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a multiple throttle device for an internal combustion engine.

(Prior Art) In an internal combustion engine for an automobile or the like, a multiple throttle device is used in which a plurality of throttle valves are provided in an intake passage and the throttle shafts of the throttle valves are connected to each other via a connecting shaft.

As such a multiple throttle device, there has been a conventional one as shown in FIGS. 3 and 4, for example.
(See Japanese Patent No. 46853).

To explain this, two throttle chambers
Throttle valves 3 and 4 are rotatably accommodated in 1 and 2 via throttle shafts 5 and 6, respectively. The two throttle shafts 5 and 6 are connected to each other via a connecting shaft 11, and the accelerator drums 7 and 8 are attached to one throttle shaft 6. The accelerator drums 7 and 8 are interlocked with an accelerator pedal or the like via a wire (not shown),
The individual throttle valves 3 and 4 are operated together via the connecting shaft 11.

Balls 14 and 20 projecting spherically are formed at both ends of the connecting shaft 11, while holes 13a and 19a are formed in nuts 13 and 19 fastened to the ends of the throttle shafts 5 and 6, respectively. By inserting the balls 14 and 20 into the shafts 19 and 19a, respectively, the connecting shaft 11
Is connected to the throttle shafts 5 and 6 coaxially.

As shown in FIG. 5, a U-shaped arm 12 is fastened to the end of the throttle shaft 6 via a nut 13, while an arm 15 protruding in the radial direction is formed at one end of the connecting shaft 11. The arm 12 holds the arm 15 with a fixing screw.
16 is screwed. The throttle shaft 6 is fixed to the connecting shaft 11 by tightening the screw 16.

As shown in FIG. 6, an arm 18 is fastened to the end of the throttle shaft 5 via a nut 19, while an arm 21 is fixed to the other end of the connecting shaft 11. Screw 22 on arm 21
While a boss portion 21a for screwing is formed on the arm 18, a receiving portion 18b for contacting the tip of the screw 22 is formed on the arm 18, and by tightening the screw 22, displacement in the axial direction is regulated. ing.

Further, although a screw 23 is screwed onto the arm 18, a boss portion 18a is formed, while the arm 21 is provided with the screw 2
A receiving portion 21b for contacting the tip of 3 is formed. The screw 23 is offset by a predetermined amount with respect to the center line of the throttle shaft 5, and by adjusting the progressive amount of the screw 23, the throttle shaft 5 and the connecting shaft 11 are positioned in the rotational direction, and each throttle valve 5 is adjusted. The opening degrees of 6 and 6 can be matched.

Spring 17,34,
25 are inserted respectively.

(Problems to be solved by the invention) By the way, in such a multiple throttle device, when the rotary positioning screw 23 is tightened, the screw 23 is indicated by a white arrow in FIG. Since a rotational force is applied in the clockwise direction as shown, the arm 18 receives a reaction force from the screw 22 in the counterclockwise direction as indicated by the black arrow.

However, since the screw 22 for axial positioning is arranged on the center line of the connecting shaft 11, the moment arm of the rotational force applied to the arm 18 from the tip surface 22a of the screw 22 is extremely small,
There was a problem that it was difficult to properly manage the tightening force of 22,23.

The present invention aims to solve these conventional problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a plurality of throttle valves rotatable in a suction passage through throttles, and a connecting shaft connecting the throttle shafts of the throttle valves. , The throttle shaft and the connecting shaft are rotatably fitted to each other, and one of the arms provided at the end of the throttle shaft and the corresponding end of the connecting shaft. Shafts each of which has an arm attached to each of the arms, the end portion of each arm being fastened to the receiving portion through a screw provided on the other arm and fixed to each other. The screw receiving portions are formed along the tangential direction on the circumference centered at, and the screws are supported by the counterpart arm so that the tip portions of the receiving portions come into contact with the receiving portions in a substantially vertical direction, and The screws of the two arms are offset from each other in the same direction with respect to the center line of rotation of the arms and supported.

(Operation) Based on the above configuration, by sufficiently securing the moment arms of the rotational force applied by the two screws and applying the rotational forces in the opposite directions to each other,
The joint rigidity between the throttle shaft and the connecting shaft can be increased, and the tightening force of each screw can be appropriately maintained, so that the openings of the two throttle valves can be matched with high accuracy.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are designated by the same reference numerals,
The description is omitted.

FIG. 1 shows a connecting portion between an arm 18 fastened to one throttle shaft via a nut 19 and an arm 21 formed at one end of a connecting shaft.

A hole 19a into which the tip of the connecting shaft is inserted is formed in the nut 19 so that the throttle shaft and the connecting shaft are rotatably connected to each other.

The arm 18 is formed with a boss portion 18a into which the screw 23 is screwed, while the arm 21 is formed with a receiving portion 21b with which the tip of the screw 23 abuts. 2 screws on arm 21
A boss portion 21a for screwing 2 together is formed, while a receiving portion 18b for contacting the tip of the screw 22 is formed at the arm 18.

The screws 22 and 23 are offset from the center line of the throttle shaft 5 by a predetermined amount, and the screw 23 applies a rotational force to the arm 18 in the clockwise direction (white arrow) in FIG. On the other hand, the screw 22 is configured to apply a rotational force to the arm 18 in the counterclockwise direction (black arrow) when tightened.

FIG. 2 shows a connecting structure on the other end side of the connecting shaft 11 (see FIG. 3),
That is, it shows a coupling structure of the arm 12 fastened via the nut 13 to the throttle shaft corresponding to the other end side and the connecting shaft side arm 15.

The nut 13 is formed with a hole 13a into which the tip of the connecting shaft is inserted so that the throttle shaft and the connecting shaft are rotatably connected to each other.

The arm 12 is formed with boss portions 12a and 12b facing each other in a U shape, and screws 16 and 27 are coaxially screwed to the boss portions 12a and 12b, respectively, while the arm 15 has both screws 1 and
A receiving portion 15a sandwiched between 6, 27 is formed.

The connecting structure on the other end side of the connecting shaft may be the same as that shown in FIG. 5, but by using the structure shown in FIG. 2, it is possible to adjust the initial position adjustment amount of the screw 27. Also, since the relative angle between the connecting shaft and the throttle shaft can be finely adjusted, the degree of freedom in adjustment can be further improved.

When assembling this multiple throttle device, first, the two throttle chambers are attached to the engine side through the bolts with both ends of the connecting shaft fitted in the holes 13a and 19a of the nuts 13 and 19, respectively. Next, the screws 16 and 27 are respectively advanced so that the receiving portion 1 is substantially orthogonal to the receiving portion 15a of the arm 15.
Tighten and fix 5a. The screw 16 is provided with a spring 17 for preventing loosening, and the screw 27 is tightened and fixed via a nut 28. Lastly, the arms 18 and 21 are fastened and fixed to each other while adjusting the screwing amounts of the screws 22 and 23 to match the opening degrees of the two throttle valves.

The screws 22 and 23 are offset with respect to the center lines of the connecting shaft 11 and the throttle shaft 5 so as to sufficiently secure the moment arm of the rotational force applied by the screws 22 and 23, and to impart rotational forces in opposite directions to each other. Since it is configured as above, it is possible to increase the joint rigidity between the throttle shaft and the connecting shaft, and it is possible to maintain the tightening force of each screw 22, 23 appropriately, and to match the opening degree of the two throttle valves with high accuracy. You can

(Advantages of the Invention) As described above, according to the present invention, in a multiple throttle device for an internal combustion engine including a connecting shaft that connects two throttle shafts, between one arm formed on one throttle shaft and one connecting shaft. Two screws are provided on each screw, and each screw is offset with respect to the center line of the connecting shaft and the throttle shaft so as to impart rotational forces in opposite directions to each other, so that the moment arm of the rotational force imparted by each screw is sufficient. By ensuring this, the joint rigidity between the throttle shaft and the connecting shaft can be increased, and the tightening force of each screw can be appropriately maintained, and the opening degrees of the two throttle valves can be matched with high accuracy. .

[Brief description of drawings]

FIG. 1 is a front view of one end of a connecting shaft showing the essential part of an embodiment of the present invention, and FIG. 2 is a front view of the other end of the connecting shaft of the embodiment. FIG. 3 is a side view showing a conventional example, FIG. 4 is a plan view of the same, and FIGS. 5 and 6 are front views. 18 ... Arm, 18a ... Boss part, 18b ... Receiving part, 19 ...
Nut, 19a ... hole, 21 ... arm, 21a ... boss, 21
b …… Reception part, 22,23 …… Screw

Claims (1)

[Scope of utility model registration request] 1. An intake passage is provided with a plurality of rotatable throttle valves via throttle shafts, and a connecting shaft for connecting the throttle shafts of the respective throttle valves, and the respective ends of the throttle shaft and the connecting shaft are rotatable with respect to each other. The end of one of the throttle shafts and the end of the corresponding connecting shaft to the end of any one of the arms through the screw provided on the other arm. A multiple throttle device which is tightened on its receiving portion to be fixed to each other, wherein a screw is installed along each of the arms along a tangential direction on a circumference centered on an axis on which the arm is attached. The receiving parts are formed, and the screws are supported on the counterpart arms so that the tips of the receiving parts come into contact with the receiving parts in a substantially vertical direction, and the screws of the two arms are respectively aligned with the rotation center lines of the arms. Multiple-throttle apparatus for an internal combustion engine, characterized in that the support is offset to the predetermined amount in the same direction and.