JP2001234760A - Coupling structure for valve and shaft of throttle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling structure of a valve and a shaft of a throttle body capable of securing light rotation of the shaft and increasing opening area at the full opening by stably receiving thrust force applied to the throttle shaft. SOLUTION: In the coupling structure of the valve and the shaft of the throttle body, a throttle valve 12 is formed into a disc shape, the throttle shaft 13 is made a planar shaft parallel to the throttle valve 12, an engagement part 13b is formed in the planar shaft, a hole 12b fitted into the planar shaft is passed through and formed in the throttle valve 12 and an engaged part 12d engaged to the engagement part 13b is provided on the hole 12b. At an entrance of the fitted hole 12b, a thrust surface 12e is formed and thrust force applied to the throttle shaft is received by abutting the surface 12e on a bore inner wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle body, and more particularly, to a coupling structure between a valve and a shaft of a throttle body capable of stably receiving a thrust force applied to a throttle shaft.

[0002]

2. Description of the Related Art Throttle bodies of automobiles are mainly made of die-cast aluminum alloy.
Synthetic resinization has advanced. This is because not only the weight can be reduced but also the machining after molding can be reduced, which can greatly contribute to cost reduction.

FIG. 6 is a cross-sectional view of a conventional resin-made throttle body cut at the position of a throttle valve. In the figure, a cylindrical bore 1a serving as an intake passage is formed substantially at the center of the body main body 1.
A disk-shaped throttle valve 2 is fixed to a throttle shaft 3 and is rotatably fitted therein.

The right side of the throttle shaft 3 penetrates a boss 1b formed on the body 1 and projects outside the body. A throttle lever 4 is attached to the projected position by a nut 5 or the like.

[0005] The left side of the throttle shaft 3 penetrates the short boss 1c, and an E-ring 6 is fitted into the penetrated portion to receive the thrust force at the same time as the stopper. At the end of the shaft 3 that has penetrated the E-ring, a disk 7
It is fitted and fixed so as to rotate with it.

A resistive film is printed on the disk 7, and a brush (not shown) fixed inside the cover 8 slides on the resistive film by the rotation of the disk 7, and the throttle shaft 3
Produces an electric resistance corresponding to the rotation angle of. This resistance value is measured as the resistance between the terminals of a connector (not shown) formed integrally with the throttle body, and the opening of the throttle is detected.

A coil spring 9 is provided outside the boss 1b of the body main body 1. One end of the coil spring 9 is locked to the body main body 1 at the other end by the throttle lever 4, and the throttle shaft 3 is attached in one rotation direction. And the throttle valve 2 is biased toward the fully closed position. At the same time, the coil spring 9 also urges the throttle lever 4 in the direction away from the body 1 (the direction of the arrow in the figure), so that the thrust of the throttle shaft 3 in the thrust direction is eliminated.

[0008]

In the throttle body described above, the throttle shaft 3 is a round bar, and when the throttle valve is fully opened, the diameter of the round bar is subtracted from the opening area of the bore. However, there is a problem that the size becomes smaller. This is a serious problem in the case of a small throttle body because the ratio of the diameter of the throttle shaft to the bore diameter increases.

The thrust force of the coil spring 9 applied to the throttle shaft in the thrust direction is received by the E-ring 6 being pressed against the end face of the boss 1c, but the E-ring is small and the thrust from the coil spring 9 is small. I couldn't secure enough power. Since the E-ring is small, the portion of the boss 1c that contacts the E-ring is liable to be worn, and the movement of the throttle shaft becomes heavy, and as a result, the life of the throttle body is shortened.

The present invention has been made in view of the above-described circumstances, and has as its first object to provide a throttle body capable of increasing the opening area when fully opened. A second object of the present invention is to provide a throttle body which can stably receive a thrust force applied to a throttle shaft, can reduce the wear and extend the life, and can keep the rotation of the throttle shaft light. The purpose is.

[0011]

In order to achieve the first object, a body having a bore serving as a gas passage, a throttle shaft penetrating the bore, and the throttle shaft fixed to the throttle shaft are provided. A throttle valve rotatable in the bore, a throttle lever fixed to one end of the throttle shaft, and a return spring provided between the throttle lever and the throttle body to bias the throttle valve in a closing direction; Wherein the throttle valve is a disc-shaped, the throttle shaft is a plate-shaped shaft parallel to the throttle valve, and the plate-shaft has an engaging portion. The throttle valve is formed with a hole through which the plate-shaped shaft is fitted. It is characterized in that a engaged portion to be engaged.

In order to achieve the first and second objects, the return spring applies an urging force in the thrust direction to the throttle shaft, and the throttle valve is provided on the inner wall side of the bore pressed by the urging force. It is characterized by having a thrust surface.

[0013] The fitting hole of the throttle valve may have a structure in which a flexible arm is provided at an entrance of the throttle valve.
A configuration having a press-fit portion can be employed.

Further, bosses are formed on both sides of the body main body through which the throttle shaft penetrates, and one slide bearing is mounted by fitting a shaft portion of a throttle lever fixed to one end of the throttle shaft to one boss. Forming
It is also possible to adopt a configuration in which the other sliding bearing is formed by fitting the shaft of the rotor constituting the throttle position sensor to the other boss.

In order to achieve the second object, the present invention provides a body having a bore serving as a gas passage, a throttle shaft penetrating the bore, and a rotating shaft fixed to the throttle shaft in the bore. A throttle having a movable throttle valve, a throttle lever fixed to one end of the throttle shaft, and a return spring provided between the throttle lever and the throttle body to bias the throttle valve in a closing direction; In the coupling structure of the valve and the shaft of the body, the return spring applies a thrust force in the thrust direction to the throttle shaft, and the throttle valve has a thrust surface on a bore inner wall side pressed by the urging force. Features.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the throttle body of the present invention. In FIG.
Has a bore 11a having a circular cross section in the center thereof, and bosses 11b and 11c on both sides. A throttle valve 12 is housed in the center of the bore 11a.

A throttle shaft 13 penetrates the throttle valve 12, and the throttle shaft 13 is a metal plate and is curved in a J-shape. When the resin-made throttle lever 14 is injection-molded, the curved portion is integrally molded. The shorter end of the J-shape of the throttle shaft 13 penetrates the throttle lever and protrudes therefrom, and serves as an operating portion 14a of the throttle lever 14.

A shaft portion 14b fitted to the boss 11b of the throttle lever 14 has a cylindrical shape, and is rotatably fitted to a hole of the boss 11b to form a sliding bearing on one side of the throttle shaft 13.

The throttle shaft 13 penetrates through the throttle valve 12 to form a shaft 15a of a rotor 15 made of resin.
, And rotates integrally with the rotor 15. The outside of the shaft portion 15a of the rotor is rotatably fitted into a hole in the boss 11c of the body main body 11, and serves as a slide bearing on the other side of the throttle shaft 13.

The throttle lever 14 is connected to the body 11
Between them, a return spring 16 formed of a coil spring is fitted. This return spring 1
6, the throttle lever 14 is biased toward the position where the throttle valve 12 closes the bore 11a. The return spring 16 also serves as a compression spring at the same time.
It is urged away from 1.

A resistive film is printed on the rotor 15, and the tip of a brush 19 attached to the cover 18 is
It is in contact with this resistance film. The brush 1 is applied on the resistance film of the rotor 15 which rotates with the rotation of the throttle shaft 13.
9 slides, and the throttle valve 1
An electric resistance corresponding to the degree of opening is generated. This resistance value is measured as the resistance between the terminals 21 of the connector 20 integrally formed by extending from the boss 11c of the throttle body 11, and forms a throttle position sensor for detecting the opening of the throttle valve 12 as a whole. ing.

FIG. 2 is an exploded perspective view showing the throttle valve 12 and a part of the shaft 13. As shown in the figure, the throttle valve 12 is substantially disc-shaped, has a thick portion 12a at the center, and a fitting hole 12b into which the throttle shaft 13 is inserted is formed therethrough. On both sides of the thick portion 12a, a plurality of triangular reinforcing ribs 12c are provided on each of the upper and lower surfaces of the valve to prevent deformation of the plate-like throttle valve 12 due to warpage or the like. Fitting hole 1
Inside the outlet side of 2b, there is an engaged portion 12d having a vertically projecting shape.

At the entrance of the fitting hole 12b, the thick portion 12a is expanded in a flange shape, and its end surface is a thrust surface 12e. The thrust surface 12e and the peripheral end surface 12f of the throttle valve 12 are part of the same spherical surface having a diameter substantially equal to the diameter of the bore 11a.

The throttle shaft 13 is made of metal and has a rectangular cross section. And the tip 1
3a is wedge-shaped so as to easily enter the fitting hole 12b, and an engaging portion 13b formed of a hole into which a projection of the engaged portion 12d of the fitting hole 12b enters is provided in the middle.

At the base end side of the engagement portion 13b, the press-fit portion 13
c protrudes to the left and right of the shaft. The width of the throttle shaft is D0, the width of the press-fit portion 13c is D1, the fitting hole 12 is
Assuming that the width of b is W, D0 is made slightly smaller than W and D
1 is slightly larger than W. As a result, the throttle shaft 13 is inserted into the throttle valve 12,
When the engaged portion 12d is engaged with the engaging portion 13b and the shaft and the valve are positioned, the press-fit portion 13c is inserted into the fitting hole 1c.
The shaft 13 and the valve 12 are press-fitted into the shaft 2b and can be connected without looseness.

Although a configuration without the press-fit portion 13c is also possible, in this case, the entire portion of the shaft 13 having the width D0 must be inserted into the fitting hole 12b without any gap.
For this purpose, it is necessary to make D0 and W substantially coincide with each other and to fit the shaft to the valve. However, in this case, the fitting becomes almost close to the press-fitting, and the work is difficult to perform by press-fitting the long shaft. Therefore, a press-fit portion 13c as shown in FIG. 2 is provided so that a portion having a width D0 other than the press-fit portion is lightly inserted into the fitting hole 12b. He tried to eliminate rattling.

Next, the assembling method will be briefly described. The return spring 16 is mounted on the body 1b. One end of the coil of the spring 16 is locked to the body body. Next, an integrated body of the throttle lever 14 and the shaft 13 is inserted from the boss 11b of the body main body 11. At this time, the throttle valve 12 is arranged in advance in the bore 11 a so that the tip of the throttle shaft 13 enters the fitting hole 12 b of the throttle valve 12.

When the shaft 13 reaches a predetermined position of the valve 12, the projection of the engaged portion 12d enters the hole of the engaging portion 13b from above and below, and the press-fit portion 13c is press-fitted into the fitting hole 12b. The tip of the shaft 13 is loosely fitted in the boss 11c on the opposite side.

Next, the shaft 15 is oriented so that the tip of the shaft 13 enters the fitting hole of the shaft 15a of the rotor 15.
5a is inserted into the boss 11c. Thus, the throttle valve 12 is rotatably mounted within the bore 11a within a range of 360 °. At this time, the thrust surface 12e is
a is in light contact with the inner wall.

Next, the cover 18 is attached.
And the other end of the return spring 16 is locked at a predetermined position of the throttle lever 14. Thereafter, the fully open position and the fully closed position of the throttle lever 14 are adjusted with an adjustment screw or stopper (not shown), and the operation is completed.

In the assembled throttle body, the throttle shaft 13 is pressed against the throttle lever 14 by the urging force of the return spring 16. This thrust force is received when the thrust surface 12e of the throttle valve 12 is pressed against the inner wall of the bore 11a.
Since this thrust surface 12e is formed on the valve 12,
An area much larger than the E-ring can be obtained, and sufficient thrust resistance can be obtained. Therefore, wear of the press contact surface does not matter, and the movement of the throttle shaft 13 can be maintained in a light state for a long period of time.

FIG. 3 is a view for explaining the opening area when the throttle valve 12 in the bore 11a is fully opened.
(A) shows the case of the prior art, and (b) shows the case of the present invention.
As shown in (a), the conventional throttle shaft 3 has a circular cross section, and the diameter d of the shaft 1 is larger than the diameter D of the bore 1a.
One part was the part that blocked the air flow. If the diameter is reduced, the opening area can be increased, but the strength is insufficient. Therefore, the opening area is reduced because the thickness is set so as not to cause the problem of strength. This has a large effect on the throttle body in which the diameter D of the bore 1a is small.

On the other hand, in the present invention, the throttle shaft 13 is formed in a plate shape as shown in FIG.
Can be made smaller than the diameter of the conventional throttle shaft, and the opening area can be increased.

When the throttle shaft 13 enters the fitting hole 12b, if the fitting is firm, cracks may occur around the fitting hole 12b. FIG. 4 is an exploded perspective view showing an embodiment of the present invention which has solved this problem. The valve 12 'in this embodiment is provided with a fitting hole 12b of the valve 12 in FIG.
A slit is formed at the entrance of the device, and flexible arms 12g are formed above and below the entrance. The distal end of the flexible arm 12g is provided with a projection as the engaged portion 12h. The other throttle shaft 13 'is connected to the throttle valve 1
A serrated press-fit portion 13d is formed at the fitting portion with 2 '.

FIG. 5 is a sectional view showing a state where the throttle shaft is fitted to the throttle valve shown in FIG.
In this embodiment, since the flexible arm 12g is formed at the entrance, the upper and lower arms 12g are bent to open the fitting hole 12b,
The tip of the shaft 13 can easily enter, and the occurrence of cracks can be prevented.

Further, a serrated press-fit portion 13d is formed, and the width D2 of the press-fit portion is slightly larger than the width W of the fitting hole 12b. And, since the inclination is provided on the tip side of the teeth (forward in the insertion direction of the shaft), the shaft 13 ′ can be easily pushed in and made hard to come off.

Although the thrust surface 12e shown in FIG. 2 is not shown in this embodiment, a thrust surface similar to that shown in FIG. 2 may be formed around the fitting hole 12b including the flexible arm. it can. In the present invention, the thrust force applied to the throttle shaft 13 by the thrust surface 12e formed on the throttle valve 12 is not limited to the case where the throttle shaft is plate-shaped as in the above-described embodiment. For example, even if a similar thrust surface is formed on the throttle valve 2 of the conventional throttle body shown in FIG. 6, a configuration in which the E-ring 6 is eliminated becomes possible.

[0038]

According to the present invention as described above,
In the coupling structure of the valve and the shaft of the throttle body, the throttle valve has a disk shape, the throttle shaft has a plate-shaped shaft parallel to the throttle valve, and an engagement portion is formed on the plate-shaped shaft. Since the hole to be fitted with the plate-shaped shaft is formed to penetrate and the engaged portion to be engaged with the engaging portion is provided in the hole, the thickness of the throttle valve can be reduced, and the throttle valve can be reduced. The opening area of the bore when fully opened can be increased.

The return spring applies a biasing force in the thrust direction to the throttle shaft. If the throttle valve has a structure in which the thrust surface is formed on the inner wall side of the bore pressed by the biasing force, the return spring is applied to the throttle shaft. Thrust force can be received by the thrust surface formed on the valve, and the thrust surface can be enlarged, so that sufficient resistance to thrust force is obtained, wear is small, rotation of the throttle shaft is light, and life is long. You can get a long throttle body.

If the fitting hole of the throttle valve has a flexible arm at the entrance, the shaft can be easily inserted into the valve without worrying that the fitting hole will be cracked.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an assembled state of a throttle body of the present invention.

FIG. 2 is an exploded perspective view showing a throttle valve and a main part of a shaft according to the present invention.

FIGS. 3A and 3B are diagrams illustrating the size of the bore opening area when the throttle valve is fully opened, wherein FIG. 3A is a diagram illustrating a conventional example, and FIG. 3B is a diagram illustrating an example of the present invention.

FIG. 4 is an exploded perspective view showing a throttle valve and a main part of a shaft according to another embodiment of the present invention.

FIG. 5 is a sectional view showing a state where a shaft is fitted to the throttle valve of FIG. 4;

FIG. 6 is a sectional view showing a configuration of a conventional throttle body.

[Explanation of symbols]

 11 Throttle body body 11a Bore 12, 12 'Throttle valve 12a Fitting hole 12d, 12h Engaged part 12e Thrust surface 13, 13' Throttle shaft 13b, 13e Engagement part 13c, 13d Press-fit part 14b, 15a Shaft part

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) F16K 1/22 F16K 1/22 DE (72) Inventor Fumihiro Hirakawa 2480 Kuno, Odawara-shi, Kanagawa Prefecture Mikuni Odawara Works Co., Ltd. (72) Inventor Atsushi Koyamauchi 2480 Kuno, Odawara-shi, Kanagawa Prefecture Inside the Mikuni Odawara Works (72) Inventor Keisuke Yoshizaki 2480 Kuno, Odawara-shi, Kanagawa Prefecture F-term in the Mikuni Odawara Works (reference) HA21 HA22 3H052 AA02 BA22 BA26 BA35 CA04 CA11 CC01 CC07 CD01 CD02 EA16

Claims (6)

[Claims] A throttle body penetrating the bore; a throttle valve fixed to the throttle shaft and rotatable in the bore; one end of the throttle shaft; A throttle lever fixed to the throttle body, and a return spring provided between the throttle lever and the throttle body for biasing the throttle valve in a closing direction. The valve is a disk, the throttle shaft is a plate-shaped shaft parallel to the throttle valve,
An engaging portion is formed in the plate-shaped shaft, and a hole for fitting the plate-shaped shaft is formed in the throttle valve so as to penetrate therethrough, and the hole is provided with an engaged portion to be engaged with the engaging portion. The combined structure of the valve and shaft of the throttle body. 2. The return spring applies a biasing force in a thrust direction to a throttle shaft.
2. The throttle valve according to claim 1, wherein the throttle valve has a thrust surface on an inner wall side of the bore pressed by the urging force.
Connection structure of the valve and shaft of the throttle body described. 3. The fitting hole of the throttle valve,
3. The structure according to claim 1, further comprising a flexible arm at an inlet of the throttle body. 4. The coupling structure between a valve and a shaft of a throttle body according to claim 1, wherein the throttle shaft has a press-fit portion at a fitting portion with the throttle valve. 5. A boss is formed on both sides of the body main body through which the throttle shaft penetrates, and a shaft portion of a throttle lever fixed to one end of the throttle shaft is fitted to one boss to thereby form one slide bearing. The throttle body valve according to any one of claims 1 to 4, wherein the other slide bearing is formed by fitting the other boss with a shaft portion of a rotor constituting a throttle position sensor. And shaft coupling structure. 6. A body having a bore serving as a gas passage, a throttle shaft penetrating the bore, a throttle valve fixed to the throttle shaft and rotatable in the bore, and one end of the throttle shaft. A throttle lever fixed to the throttle body, and a return spring provided between the throttle lever and the throttle body for biasing the throttle valve in a closing direction. A spring for applying a biasing force in the thrust direction to the throttle shaft, wherein the throttle valve has a thrust surface on an inner wall side of the bore pressed by the biasing force; .