JPH06207535A - Throttle valve driving device of internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent generation of vibration and deformation and to relieve the burden of the bearing of a throttle body by firmly supporting the intermediate part of a throttle shaft through which a pair of throttle bodies are interlocked with each other. CONSTITUTION:A pair of throttle bodies 17 and 18 are independently arranged and the throttle valves of the two throttle bodies are simultaneously opened and closed through a throttle shaft 37. The throttle shaft 37 comprises three parts of first and second throttle shafts and an intermediate throttle shaft, which are intercoupled for integral rotation and form a substantially integral one-piece type. A center bracket 20 to support the intermediate part of the throttle shaft 37 is fixed to a boss part 16 at the front end of the intermediate part 10 of a suction manifold upper 1. An electric motor 54 to forcibly close the throttle valve during occurrence of a slip is also supported at the center bracket 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a throttle valve drive device for an internal combustion engine, in which throttle valves of a pair of throttle bodies are integrally interlocked to open and close.

[0002]

2. Description of the Related Art For example, in a V-type internal combustion engine having a pair of intake collectors, a throttle valve is provided at the inlet of each intake collector, and both throttle valves are integrally driven so as to be driven by an accelerator pedal. The throttle valve drive device described above may be used. As one example, in Japanese Patent Laid-Open No. 60-69255, an intake collector is provided for each bank of a V-type internal combustion engine, a throttle body is provided at each intake collector inlet, and a common throttle shaft is provided continuously. The throttle valve of each throttle body is attached to the structure to open and close a pair of throttle valves at the same time. In this structure, the throttle body is fixed to the intake collector, and the middle portion of the throttle shaft is not particularly supported. That is, both ends of the throttle shaft are rotatably supported by the throttle body.

[0003]

In the structure in which the throttle shaft to which the pair of throttle valves are connected is simply supported only by the throttle body as described above, the supporting rigidity of the intermediate portion of the throttle shaft is not sufficient, and the throttle shaft is not supported sufficiently. Easy to cause vibration. In addition, the bearing of the throttle body is heavily loaded, and the bearing must be enlarged.
Moreover, it is difficult to reduce the diameter of the throttle shaft itself.

Since the throttle shaft is arranged across the V bank, if the middle portion is to be supported by the cylinder head or the like, it is necessary to elongate the boss portion from the cylinder head or the like. It is difficult to secure sufficient support rigidity.

[0005]

Therefore, according to the present invention,
A boss portion is provided integrally with the intake manifold, and a center bracket that supports the middle portion of the throttle shaft is fixed to this boss portion. That is, the throttle valve drive system for an internal combustion engine according to the present invention includes an intake manifold having a pair of intake collectors, an intermediate flange part integrally connecting intermediate parts of a plurality of branch parts of the intake manifold, and an intermediate flange part. A boss formed at the front end of the engine, a pair of throttle bodies attached to each of the pair of intake collectors and provided with throttle valves, respectively, arranged so as to pass through both throttle bodies, and each throttle valve is attached. A single continuous throttle shaft, and a center bracket that is located at an intermediate portion of a pair of throttle bodies and rotatably supports the intermediate portion of the throttle shaft, and is fixed to the boss portion. There is.

[0006]

[Function] The throttle valves of both throttle bodies are interlocked by a common throttle shaft to open and close integrally. The center portion of the throttle shaft is rotatably supported by the center bracket. The center bracket is fixed to a boss that is integral with the intake manifold. Since the boss portion is formed at the front end of the intermediate flange portion that integrally joins the intermediate portions of the plurality of branch portions of the intake manifold, the rigidity becomes extremely high.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In this embodiment, the present invention is applied to a throttle valve driving device for a V-type 6-cylinder internal combustion engine. In particular, the basic opening / closing drive of the throttle valve is mechanically performed by the driver's accelerator operation, and the drive wheels are The electric motor for traction control that forcibly reduces the throttle valve opening at the time of slip detection is provided.

FIG. 1 shows an intake system of a V-type 6-cylinder internal combustion engine equipped with a throttle valve drive device according to the present invention, in which intake collectors 2 and 3 are provided for each of the left and right banks, and The intake inlet pipes 4 and 5 connected to the central portions of the intake collectors 2 and 3 are bent in the same direction in an L shape, and flange portions 6 and 7 for mounting the throttle body are formed at the respective tip portions. Has been done. Each of the three branch portions 8 and 9 of each of the intake collectors 2 and 3 is integrally joined at the center intermediate flange portion 10 at the tip end portion thereof. That is, the left and right intake collectors 2, 3, the branch portions 8, 9, and the intake inlet pipes 4, 5 are integrally cast as the intake manifold upper 1. As shown in FIG. 2, the intake manifold upper 1 is connected to a separately cast intake manifold drawer 11 at the intermediate flange portion 10. The intake manifold 11 has branch parts 8'and 9'which communicate with the branch parts 8 and 9, and the tips of the branch parts 8'and 9'are intakes of the cylinder heads 12 and 13 of the left and right banks. It is designed to be connected to the ports 14 and 15. Therefore, when the upper and lower branch portions 8, 8'and 9, 9'are continuous,
The intermediate flange portion 10 is located at the intermediate portion.

At the front end of the intermediate flange portion 10, as shown in FIG.
As shown in, a pair of boss portions 16 are formed symmetrically in the left-right direction. The boss portion 16 is located at a height near the upper ends of the cylinder heads 12 and 13, and is at the center of the left and right banks.

Further, independent throttle bodies 17 and 18 are attached to the flange portions 6 and 7 at the distal end portions of the intake inlet pipes 4 and 5 which are separated left and right by four bolts 19 respectively. A center bracket 20 described later is fixed to the boss portion 16 at the front end of the intermediate flange portion 10 with a pair of bolts 21.

3 and 4 show the details of the throttle bodies 17, 18 and the like. Each throttle body 17, 18 has a substantially rectangular flange portion 27 bolted to the intake inlet pipes 4, 5. , 28 and the intake pipe duct 29,
Disc-shaped throttle valves 35 and 36 are provided so as to open and close the intake passages 33 and 34, respectively, which have cylindrical portions 31 and 32 to which 30 is connected. A throttle shaft 37 that connects these throttle valves 35 and 36 to each other.
Is roughly divided into three parts, but they are connected so as to rotate integrally with each other, and are substantially continuous. That is, the first throttle shaft 38 located at one end is arranged so as to penetrate the throttle body 17, and the throttle valve 35 is fixed. Similarly, the second throttle shaft 3 located at the other end
9 is arranged so as to penetrate through the throttle body 18, and the throttle valve 36 is fixed. Then, the intermediate throttle shaft 40 located in the intermediate portion has the left and right connecting portions 41, 4
The first and second throttle shafts 38 and 39 are connected to each other via 2 so as to rotate integrally therewith. Incidentally, each connecting portion 4
1, 42 have a kind of ball joint-like structure, and are configured so that smooth rotation transmission can be performed even in a slightly swung state.

An accelerator drum 43 and an ASCD drum 44 for vehicle control are provided at one end of the first throttle shaft 38 that penetrates the throttle body 17 on the left side of the drawing, specifically, at the end on the side of the intermediate throttle shaft 40. They are arranged side by side. A return spring 45 that biases the first throttle shaft 38 in the closing direction, an ASCD drum return spring 46 that biases the ASCD drum 44 in the closing direction, and a lost motion spring 47 are sequentially interposed. The accelerator drum 43 is the first
It is not fixed to the throttle shaft 38, and when the accelerator drum 43 is operated via an accelerator wire (not shown), its movement is transmitted to the entire throttle shaft 37 via the lost motion spring 47. There is. An accelerator opening sensor 48 is arranged on the lower surface of the throttle body 17, and a link mechanism 49
The opening of the accelerator drum 43 is detected via the.

The second throttle shaft 39 passing through the throttle body 18 on the right side of the drawing does not have an accelerator drum, but has only a return spring 50 at the end on the intermediate throttle shaft 40 side. In addition, the throttle body 1 should be set so that the rotation angle of the opposite end is directly detected.
A throttle opening sensor 51 is arranged on the side portion of 8. Reference numeral 52 denotes a fast idle piston that protrudes and increases the throttle valve opening when the engine cooling water temperature is low.

The intermediate throttle shaft 40, which constitutes the intermediate portion of the throttle shaft 37, is rotatably supported by the center bracket 20. The center bracket 20 has a substantially U shape and has a central base portion 2
0a is fixed to the boss portion 16 at the front end of the intermediate flange portion 10 of the intake manifold upper 1 by the pair of bolts 21 as described above. A gear box portion 53 is integrally provided at one end of the center bracket 20, and an electric motor 54 is attached to the gear box portion 53. As shown in FIG. 5, the electric motor 54 has its axis offset from the throttle shaft 37 and is arranged in parallel.

6 and 7 show the gear box portion 5 described above.
3 shows the internal structure, in which the pinion 55 provided on the shaft of the electric motor 54 meshes with the large gear 56a of the intermediate gear 56. The intermediate gear 56 has a small gear 56b integrally with the large gear 56a, and the small gear 56b is a fan gear 57.
Meshes with. The fan-shaped gear 57 is rotatable about the intermediate throttle shaft 40 and is not fixed to the intermediate throttle shaft 40. A control lever 58 is fixed to the intermediate throttle shaft 40, and the end of the fan gear 57 and the tip of the control lever 58 can come into contact with each other. Reference numeral 59 is a return spring that urges the fan gear 57 to one side, and 60 is a bearing that rotatably supports the intermediate throttle shaft 40.

That is, FIG. 7 shows that the electric motor 54 for traction control is in the OFF state and the throttle valve 3
5 and 36 are fully closed, but when the electric motor 54 is OFF, the throttle valve 3 is
Since the fan-shaped gear 57 is rotated to a position corresponding to the fully opened positions of the throttle valves 35 and 36, the throttle valves 35 and 36 are in a state of being freely rotatable according to the movement of the accelerator drum 43. That is, the throttle valves 35 and 36 are opened / closed according to the driver's intention. On the other hand, the electric motor 54
When is turned on, the fan gear 57 rotates in the counterclockwise direction in the figure, so that the tip end portion of the control lever 58 can be pressed to forcefully operate the throttle valves 35 and 36 in the closing direction. In this state, the lost motion spring 47 is displaced and the accelerator drum 43 itself does not move.

Thus, according to the configuration of the above embodiment,
Since the middle portion of the throttle shaft 37, specifically, the intermediate throttle shaft 40 is rotatably supported by the center bracket 20, the throttle shaft 4
Vibration and deformation of 0 are suppressed. In particular, the boss portion 16 to which the center bracket 20 is fixed is integrally formed at the front end of the intermediate flange portion 10 having high rigidity of the intake manifold upper 1, so that the center bracket 20 can be firmly supported. Therefore, the throttle body 17,
The bearing load on 18 is lightened, and smooth operation of the throttle shaft 37 can be ensured. At the same time, since the electric motor 54, which is a heavy object, is firmly supported by the intermediate flange portion 10 of the intake manifold upper 1 via the center bracket 20, the throttle body 17,
No load is applied to the mounting portion of 18, and the throttle body 1
There is no risk of the 7, 18 vibrating significantly. And
Although the length of the throttle shaft 37 becomes long as a whole, the electric motor 54 drives the intermediate portion of the throttle shaft 37 during the operation of the traction control, so that the torsional deformation of the throttle shaft 37 does not become excessively large, and the throttle This is advantageous in securing the rigidity of the shaft 37.

Further, in this embodiment, since the electric motor 54 for traction control is located at the intermediate portion between the pair of throttle bodies 17 and 18, when the electric motor 54 is arranged outside the throttle bodies 17 and 18. The entire device can be downsized as compared with. In particular, assuming that the internal combustion engine of this embodiment is mounted in a vehicle in the FR format, FIG.
As shown in FIG. 4, the central portion of the vehicle of the engine hood 61 is higher than both side portions of the vehicle, so that the electric motor 54
A sufficient margin can be provided above, and the position of the engine hood 61 can be set relatively low.

In the above embodiment, the electric motor 54 for traction control is provided integrally with the throttle valve driving device, but the present invention is not limited to this.
The present invention can be widely applied to a throttle valve drive device in which a pair of left and right throttle valves are simply linked with a throttle shaft without a traction control system. Further, the present invention can be applied not only to the V-type internal combustion engine as described above but also to a horizontally opposed engine or the like.

[0020]

As is apparent from the above description, according to the throttle valve drive system for an internal combustion engine according to the present invention, the intermediate portion of the throttle shaft that interlocks the left and right throttle bodies is connected to the intake manifold via the center bracket. Since it is firmly supported, vibration and deformation of the throttle shaft can be prevented, smooth operation can be ensured, and the load on the bearing on the throttle body side is reduced. In particular, since the boss portion for fixing the center bracket is integrally formed with the intermediate flange portion of the intake manifold, a very high support rigidity can be secured without increasing the weight of each portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an intake system including a throttle valve drive device according to the present invention.

FIG. 2 is a front view of a main part of an internal combustion engine to which the throttle valve driving device is attached.

FIG. 3 is a front view of a throttle valve drive device.

FIG. 4 is a plan view of the same.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a sectional view of a gear box portion.

FIG. 7 is an explanatory diagram showing a relationship between gears.

[Explanation of symbols]

 1 ... Intake manifold upper 10 ... Intermediate flange 11 ... Intake manifold 16 ... Boss 17, 18 ... Throttle body 20 ... Center bracket 37 ... Throttle shaft 43 ... Accelerator drum 54 ... Electric motor

Claims (1)

[Claims] 1. An intake manifold having a pair of intake collectors, an intermediate flange portion integrally connecting intermediate portions of a plurality of branch portions of the intake manifold, and a boss portion formed at a front end of the intermediate flange portion. A pair of throttle bodies attached to each of the pair of intake collectors, each of which has a throttle valve, a pair of throttle shafts that are arranged so as to penetrate through both throttle bodies and to which each throttle valve is attached, A throttle valve drive device for an internal combustion engine, comprising: a center bracket which is located at an intermediate portion of a throttle body, rotatably supports the intermediate portion of the throttle shaft, and which is fixed to the boss portion.