JPH073193B2 - Opening / closing device for throttle valve for internal combustion engine - Google Patents

Description

Detailed Description of the Invention a. OBJECT OF THE INVENTION A-1. Field of Industrial Application The present invention relates to a throttle valve opening / closing device for an internal combustion engine.

A-2. Conventional technology Conventionally, a main slot valve has been used as a device that allows fine adjustment of the intake air amount by the accelerator petal when the vehicle starts or when the vehicle is loaded with load, and that quickly obtains a high air amount during acceleration. A two-barrel type throttle valve device having a secondary throttle valve and a secondary throttle valve which are operated by an interlocking mechanism is, for example, the actual open sho 57-10134.
It is disclosed in the publication. Further, in order to obtain an arbitrary functional relationship between the accelerator pedal depression amount and the throttle valve opening angle, a relay lever interlocking with the accelerator petal and an opening / closing lever fixed to the throttle shaft are provided. A device in which the roller provided on the relay lever is engaged with the cam groove formed on the opening / closing lever and interlocked with the roller and the opening of the throttle valve is set by the shape of the cam groove is disclosed in, for example, Japanese Patent Publication No. 57-198333. It is disclosed in Japanese Patent Laid-Open No. 57-198334.

A-3. Problems to be Solved by the Present Invention In the former one of the above-mentioned conventional structures, since it is a two barrel type using two throttle valves, the throttle device body becomes large and the main throttle valve is used. It is difficult to select the opening timing of the secondary throttle valve and the throttle valve diameter. Further, in the latter case, when it is desired to change and adjust the functional relationship between the accelerator pedal depression amount and the throttle valve opening angle after assembling, it is necessary to change the shape of the cam groove. However, there is a problem that the accuracy of forming the cam groove is required, and further, the abrasion resistance against the sliding of the cam groove and the roller is required, resulting in a high cost.

Therefore, the present invention provides a mechanism for easily adjusting the intake air amount by the accelerator petal by reducing the opening amount of the throttle valve with respect to the amount of depression of the accelerator petal at the time of starting or at the time of load load. In order to solve the above-mentioned problems, it is possible to configure a simple link mechanism without using the above-mentioned cam groove and roller, and to easily change and adjust the characteristics of the intake air amount. It is intended.

B. Configuration of the invention b-1. Means for solving the problems In order to solve the above problems, the throttle shaft is fixedly attached to the throttle shaft (3) to which the throttle valve is fixed and is rotated around the throttle shaft (3). Main throttle arm (6) and an accelerator wire lever (1
6), the sub-throttle arm (19) that rotates integrally with the accelerator wire lever, and the sub-throttle arm (1
A connection link (21) for connecting the 9) side and the main throttle arm (6) side is provided, and further the connection link (21) is connected to the sub throttle arm (19) side.
It has a connecting portion (22) and a second connecting portion (23) for connecting to the main throttle arm (6) side, and changes and adjusts the relative positions of both connecting portions (22), (23) of the connecting link. As the adjusting means, the first connecting portion (22)
Is configured to be displaceable, and the connecting link (21) is configured to be expandable and contractable.

B.-2. Action In the first aspect of the invention, in the fully closed state of the throttle valve, the quadrant of each of the second connecting portion (23) and the first connecting portion (22) is moved one by one from the latter. Quadrant of the first connecting portion (22) and the setting radius of the second connecting portion (23) longer than that of the second connecting portion (23), the rotation angle of the first connecting portion (22) As a result, the rotation angle of the second connecting portion (23) becomes smaller. Therefore, with respect to the rotation amount of the accelerator wire lever (16) that rotates the first connecting portion (22),
The amount of rotation of the throttle valve (4) rotated by the connecting portion (23) becomes small, and the intake air amount with respect to the accelerator wire stroke amount becomes small in the initial opening range of the throttle valve.

Furthermore, since the adjusting means for changing and adjusting the mutual positional relationship between the two connecting portions in the connecting link is realized with a simple structure, it is possible to easily change and adjust while maintaining the above operation.

B-3. Embodiments FIGS. 1 to 3 are explanatory views for explaining the adjusting means by using a general structure. (1) is a one-barrel type throttle device main body, in which an intake passage (2) is provided. The throttle shaft (3) penetrates, and the throttle valve (4) is fixed to the throttle shaft by a mounting screw (5). (6) is a main throttle arm, which is fixed to the outer end of the throttle shaft (3) with a flat washer (7) and a nut (8). A connecting piece (6a) is integrally formed at the lower end of the main throttle arm (6), and a stopper piece (6b).
Is formed so as to project rightward in FIGS. 1 and 2, and its tip (6c) is further bent rightward in FIG.

The fully closed position of the throttle valve (4) is brought about by the contact of the tip (6c) with the lower end (9a) of the stopper (9) consisting of a screw rod screwed to the protrusion (1a) of the body (1). The throttle valve (4) is regulated, and the opening / closing of the throttle valve (4) can be adjusted by advancing and retracting the stopper (9). (10) is a lock nut.
Reference numeral (11) is a main throttle lever which is freely rotatably fitted in the throttle shaft (3), and an adjusting piece (11) is provided on one side of the throttle shaft (3) which is a fulcrum of rotation thereof.
a) and the other has a connecting piece (11b). The adjusting piece (11a) and the connecting piece (6a) of the main throttle arm (6) are connected by an adjusting screw (13) and a nut (14) via a spring (12), and the adjusting screw (6) 13)
It is possible to adjust the connecting angle of the main throttle lever (11) with respect to the main throttle arm (6) by the forward and reverse rotation of the. (15) is a throttle spring, which is engaged with the main throttle arm (6),
When the main throttle arm (6) and the main throttle lever (11) are connected, the counterclockwise direction in FIG.
That is, the throttle valve (4) is urged in the closing direction. Reference numeral (16) denotes an accelerator wire lever rotatably provided on the support shaft (17) via an SE ring (18). The tip of an accelerator wire (not shown) is fixed to the wire connecting portion (16a) of the lever. When the accelerator wire is fitted into the wire groove (16b) and the accelerator wire is pulled by stepping on the accelerator petal (not shown), the accelerator wire lever (16) is centered on the spindle (17) in FIG. It is designed to rotate clockwise. (19) is a sub-throttle arm, which is welded and fixed to the accelerator wire lever (16) and rotates integrally with the accelerator wire lever (16). (20) is a return spring for engaging one end with the sub-throttle arm (19) to integrally urge the sub-throttle arm (19) and the accelerator wire lever (16) counterclockwise in FIG. Is. The return spring (20) is biased by simply returning the sub-throttle arm (19) and accelerator wire lever (16) to the throttle valve (4).
It is set to a biasing force that does not hinder the opening and closing of the.
Reference numeral (21) is a connecting link that connects the tip of the sub-throttle arm (19) and the tip of the connecting piece (11b) of the main throttle lever (11).
2) and the second connecting portion (23) are rotatably connected by a pin and an SE ring, respectively.

Next, the operation in the above-mentioned explanatory diagram will be described.

From the state shown in Fig. 1 where the throttle valve (4) is fully closed, depress the accelerator pedal and push the accelerator wire lever (16) through the accelerator wire clockwise about the support shaft (17) (in the direction of the arrow in the figure). When turned to, the sub-throttle arm (19) integrated with the accelerator wire lever (16) also turns clockwise by the same amount. Then, the connecting link (21) connected to the sub-throttle arm (19) is pushed downward (in the direction of the arrow in FIG. 1) in FIG. 1, and the main throttle lever (11) connected to the other end of the connecting link (21). Is rotated about the throttle shaft (3) in the clockwise direction (arrow direction in the figure) in FIG. By this rotation, the main throttle arm (6) connected by the adjusting screw (13) also follows the throttle spring (15) and rotates in the clockwise direction in the same manner, and the throttle valve (6) is rotated through the throttle shaft (3). 4) Open operation.
Also, when the accelerator wire is loosened, the throttle spring (15) and the return spring (20) urge the
The main throttle arm (6), the main slot lever (11), the accelerator wire lever (16), and the sub-throttle arm (19) are rotated counterclockwise respectively, and the stopper piece (6b) of the main throttle arm (6) is returned. The front end (6c) formed in the above contacts the stopper (9) and the throttle valve (4) is fully closed.

Next, in order to adjust the fully closed position of the throttle valve (4), the stopper (9) consisting of a screw rod is rotated forward and backward to move forward and backward, and the movement amount of the stopper piece (6b) in the closing direction in the throttle arm (6). The throttle valve (4) is set to a slightly opened state so that the throttle valve (4) does not bite into the inner surface of the intake cylinder.

Next, when the throttle valve (4) is fully closed, that is, when the throttle valve (4) is in the initial opening operation, each connecting portion (2
2) The case of changing and adjusting the position of (23) will be described. First, when the adjusting screw (13) is rotated to the tightening side where the spring (12) is compressed, the main throttle arm (6) is immovable with respect to the closing direction. Shaft (3)
Rotate counterclockwise in the figure around the
The second connecting portion (23) between the b) and the connecting link (21) also moves counterclockwise. As a result, the connecting link (21) is pushed up, and the first connecting portion (22) with the sub-throttle arm (19) connected thereto is also moved upward in the counterclockwise direction, and the sub-throttle arm (19) is moved. Rotate counterclockwise about the support shaft (17). The accelerator wire lever (16) also rotates counterclockwise by the same amount as the sub-throttle arm (19).

Further, when the adjusting screw (13) is rotated to the loosening side where the spring (12) extends, the main throttle lever (11) rotates clockwise around the throttle shaft (3), and this rotation is the second. Connection part (23), connection link (21),
It is transmitted to the sub-throttle arm (19), the first connecting portion (22) and the accelerator wire lever (16), and these move in the opposite direction.

Next, the depression amount of the accelerator petal, that is, the intake air amount with respect to the opening amount of the accelerator wire lever (16) will be described. In Figure 4, the main throttle lever (11) L ₂ the length of the connecting piece (11b) of, when the length of the sub-throttle arm (19) and L _1, the length relationship L _1> L ₂
Is set to. When the first connecting portion (22) of the connecting link (21) is (A) and the connecting portion (23) is (B),
When the throttle valve is fully closed, (A) is set in the first quadrant centered on the spindle (17), which is the center of rotation, and (B) is centered on the throttle shaft (3), which is the center of rotation. It is set in the second quadrant. And in this positional relationship, the sub throttle arm (19)
When θ is rotated clockwise by θ _A , the main throttle lever (11) rotates by θ _B. Analyzing the rotation angle within the range of θ _A and θ _B , θ ₄ <θ ₁ , θ ₅ / θ ₂ ≈1, θ
A characteristic of ₆ / θ ₃ > 1 is obtained.

This characteristic is shown in FIG. 5, but in the conventional one, the throttle valve opening θ with respect to the rotation amount of the accelerator wire lever, that is, the amount of the accelerator wire stroke.
In contrast to the straight line relationship of (a), the present invention has the relationship of the curved line (b).

Is as Figure 6 is represented by the theta _{4 /} theta _{1 <passing} intake air amount due to opening of the throttle valve (4) a relationship Qm ³ / h. That is, in the initial opening range of the throttle valve, as shown in (c) of FIG. 6, it is possible to set the relationship of θ ₄ / θ ₁ <1 to the opening range corresponding to the intake air amount of 50 m ³ / h, The ratio of intake air amount to xel wire stroke amount (dQ / dθ) can be made smaller than that of the conventional characteristic (2), and as a result, a small amount of air amount can be easily controlled. Next, the adjusting screw (13) is rotationally adjusted so that the connecting portions (A) and (B) move counterclockwise, and the connecting portions (A) are moved.
As shown in FIG. 4 (B), A ₁ and B ₁ are used as basic positions for A ₂
A case where the initial positions are changed and adjusted to B ₂ and B ₃ to A ₃ will be described.

When the initial position is changed to A ₂ and B ₂ and A ₃ and B ₃ in this way, the value of the relationship similar to θ ₄ / θ ₁ is at A ₁ and B ₁ points as shown in FIG. For basic characteristics C ₁ , A ₂ , B ₂
And A _3, that value as the characteristic of the C _2, C ₃ as to change B ₃ becomes successively smaller. Therefore, the value of dQ / dθ can be gradually decreased, and a smaller amount of air can be controlled than the range of θ ₁ and θ ₄ .

Further, by rotating the adjusting screw (13) in the opposite direction to the above, the characteristics opposite to the above can be obtained.

Next, a first embodiment of the present invention shown in FIGS. 8 to 10 will be described. In the present embodiment, θ ₄ /
In the relationship of θ ₁ <1, by adjusting and moving the (B) part which is the second connecting part of (23), the same adjustment as that of the adjusting screw (13) in the above-mentioned explanatory diagram can be performed. Is. That is, in FIG. 9, the point (A) which is the first connecting portion (22) between the connecting link (21) and the sub throttle arm (19) is indicated by the sub throttle arm (19).
By changing the movement in the radial direction around the support shaft (17), the characteristic value changes. This characteristic value decreases as the connecting link (21) becomes shorter (L ₃ ), (L ₁ ), (L ₄ ).
It changes like (L ₃ ), (L ₁ ), and (L ₄ ) in FIG. 10, and characteristic values similar to those in the above-mentioned explanatory diagram are obtained.

A concrete structure in this embodiment is shown in FIG. In FIG. 8, the present embodiment does not require the adjusting mechanism such as the adjusting piece (11a) and the adjusting screw (13) as shown in the above-mentioned drawing, so that one end of the main throttle arm (6) is integrally formed with this. Direct connecting link (2) via the connected connecting piece (6d)
It is linked to 1). In addition, the sub throttle arm (1
9) has a plurality of connecting holes (22-3), (22-1), (22-4) in the radial direction centered on the spindle (17) which is the center of rotation.
Is formed, and the other end of the connecting link (21) is selectively connected thereto.

Further, the connection link (21) includes a screw rod (21-1) rotatably provided on the second connection portion (23) side and a screw rod (21-) rotatably provided on the first connection portion (22) side. 2) Turn turn (21-3)
The turn link (21-3) can be rotated forward and backward to change and adjust the total length of the connecting link (21). In FIG. 8, (21-4) indicates a lock nut. Other structures are the same as those in the above-mentioned explanatory view.

Next, a second embodiment of the present invention shown in FIGS. 11 to 13 will be described. In this embodiment, the first connecting portion (22) is surrounded by the one in which the connecting portion between the sub-throttle arm (19) and the connecting link (21) can be adjusted in the radial direction. It is possible to adjust the fluctuation in the direction. That is, the first connecting portion (22) and the second connecting portion (23)
The connection state of is similar to that of the above embodiment, and the connection link (21)
Is a structure that can be expanded and contracted. In this, the length of the connecting link (21) is as shown in FIG.
If the length is changed to L ₅ , L ₆ , and L ₇ , the characteristics are as shown in Fig. 13.
It changes like L ₅ , L ₆ , and L ₇ , and the same characteristics as those of the above-mentioned embodiment can be obtained.

C. EFFECTS OF THE INVENTION As described above, according to the present invention, in the initial opening range of the throttle valve, the intake air amount with respect to the stroke amount of the accelerator wire can be reduced and the fine adjustment operation of the intake air amount by the accelerator petal can be easily performed. In addition, this fine adjustment operation can be achieved with one barrel, and in particular, the accelerator wire lever side and throttle arm side
Because it can be achieved by connecting with a book connecting link,
The parts are not required to have high precision or high wear resistance as in the case of using the conventional cam groove, and the parts can be easily formed at low cost. Further, in this invention, the first connecting portion (22) is set as the adjusting means so as to be displaceable, and the connecting link is configured to be expandable and contractable. Therefore, after the parts are assembled, the operation of the invention is continued until the parts are assembled. Since the effect can be maintained and the characteristic of the intake air amount can be changed, the change operation is easier than the conventional one in which the parts are replaced, and the change of the parts can be performed without changing the parts. It is versatile enough to support internal combustion engines with various engine characteristics.

[Brief description of drawings]

FIG. 1 is a side view for explaining the adjusting means by using a general structure, FIG. 2 is a plan view of the same, FIG. 3 is a right side view of the same, FIG. 4 is an explanatory view of its operation, and FIGS. FIG. 8 is a characteristic view, FIG. 8 is a side view showing the first embodiment of the present invention, FIG.
FIG. 10 is the same characteristic diagram, FIG. 11 is a side view showing the second embodiment of the present invention, FIG. 12 is the same explanatory diagram, and FIG. 13 is the same characteristic diagram. (3) …… Throttle shaft (4) …… Throttle valve (6) …… Main throttle arm (11) …… Main throttle lever (13) …… Adjustment screw (16) …… Accelerator wire lever (17) …… Support shaft (19) …… Sub-throttle arm (21) …… Connecting link (22) …… First connecting part (23) …… Second connecting part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Hara, 1-1, Kyowa-cho, Obu-shi, Aichi 1 Aisan Industry Co., Ltd. Within the corporation (56) Reference JP-A-60-252129 (JP, A) Actually open 58-148237 (JP, U) Actually open 60-8436 (JP, U) Actually open 49-127639 (JP, U) Real public Sho 41-11372 (JP, Y1)

Claims (2)

[Claims] 1. A throttle shaft (3) fixed to a throttle shaft (3) having a throttle valve fixed thereto.
Main throttle arm (6) that rotates around
An accelerator wire lever (16) that rotates about a spindle different from the throttle shaft, a sub-throttle arm (19) that rotates integrally with the accelerator wire lever, and a sub-throttle arm (19) side. Connection link (2) that connects the main throttle arm (6) side
1) is provided, and further, the connection link (21) is connected to the sub throttle arm (19) side by a first connection part (22) and the main throttle arm (6) side is connected by a second connection part (23). And the first connecting part (22) as adjusting means for changing and adjusting the relative position of both connecting parts (22), (23) of the connecting link.
And an opening / closing device for an internal combustion engine throttle valve, wherein the connecting link (21) is configured to be expandable and contractible. 2. An opening / closing device for a throttle valve for an internal combustion engine according to claim 1, wherein a turnbuckle device is added to the connecting link to form the continuous link so that it can expand and contract.