JP2002357131A - Waterproofing structure of throttle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing structure manufacturable by simple machining without increasing the number of part items and capable of preventing the infiltration of water into a storage space. SOLUTION: This waterproofing structure of a throttle body is constituted by a water drain hole 25 communicating with the storage space 9 of a valve element driving system part formed in a main body 1 and a breathing hole 23 communicating with the storage space 9. The water drain hole 25 is positioned on the lower side of the storage space 9 on a vehicle. The breathing hole 23 forms a labyrinth by a through hole 22 passing through an intake manifold abutting face 14 of the body main body 1 from the storage space 9 and a groove 15 which is positioned along the intake manifold abutting face 14 from the through hole 22 and whose end part is communicated with the outside air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a throttle body, and more particularly, to a waterproof structure for a throttle body which is disposed in an intake passage of an internal combustion engine and adjusts an intake flow rate.

[0002]

2. Description of the Related Art An electronic throttle body includes a valve body driving system component such as a motor and a gear for opening and closing a valve, and these valve body driving system components are housed in a housing space formed in a body body. . Further, the throttle body includes a sensor system component such as an opening sensor for detecting the opening of the valve, and the sensor system component is housed in a housing space formed in the body main body.

[0003] Since the throttle body is mounted in the engine room of the vehicle, it is necessary to prevent the intrusion of water into the accommodating space when the engine room is cleaned, for example, by causing the throttle body to open. A drainage structure having a drainage hole and a breathing hole as disclosed in Japanese Patent Application Laid-Open No. 64-34854 is employed.

[0004]

However, if high-pressure water is simultaneously applied to the drain hole and the breathing hole during high-pressure washing, water may enter the accommodation space and cause a malfunction.

In view of the above problems, the present invention provides a waterproof structure which can be manufactured by simple processing without increasing the number of parts and which can prevent water from entering the housing space. Aim.

[0006]

According to the present invention, there is provided a waterproof structure for a throttle body, comprising: a drain hole communicating with a storage space for a valve body driving system component formed in a body main body; and a breathing hole communicating with the storage space. Wherein the drain hole is located below the storage space when mounted on a vehicle, and the breathing hole is provided between the storage space and an intake manifold mating surface of the body main body. A maze is formed by a through hole that penetrates through the groove and a groove that is located from the through hole along the intake manifold mating surface and has an end communicating with the outside air.

Further, the waterproof structure of the throttle body according to the present invention comprises a drain hole communicating with a storage space for a valve body drive system component formed in the body main body, and a breathing hole communicating with the storage space. The waterproof structure of the throttle body, wherein the drain hole is located below the storage space when mounted on a vehicle, and the breathing hole penetrates from the storage space to an intake manifold mating surface side of the body main body. A through hole, an open-to-atmosphere space, a side wall portion that covers one side surface of the through hole, and a bottom wall portion that extends substantially horizontally from the lower end of the side wall portion below the through hole and has an end face. An air opening formed by an L-shaped wall portion flush with the intake manifold mating surface and a gasket attached to the end surface of the L-shaped wall portion and the intake manifold mating surface. Characterized in that it is formed by the space.

Further, the waterproof structure of the throttle body according to the present invention comprises a drain hole communicating with the storage space for the valve body drive system components formed in the body main body, and a breathing hole communicating with the storage space. A waterproof structure for a throttle body, wherein the drain hole is located below the storage space when mounted on a vehicle, and the drain hole and the breathing hole are respectively connected to the intake of the body from the storage space. A maze is formed by a through hole penetrating the manifold mating surface, and a groove extending from the through hole along the intake manifold mating surface and having an end located below the through hole communicating with the outside air. Features.

Further, the waterproof structure of the throttle body according to the present invention comprises a drain hole communicating with the storage space for the valve body drive system components formed in the body main body, and a breathing hole communicating with the storage space. In a waterproof structure of a throttle body, the drain hole is located below the storage space on a vehicle, and the breathing hole is located in a storage space of a valve body drive system component of the body main body. A maze is formed by a downward hole that opens to the outside, a passage that communicates with the downward hole, extends substantially horizontally toward the storage space, and an upward hole that extends upward from the end of the passage and opens to the storage space. It is characterized by the following.

The waterproof structure for a throttle body according to the present invention is a waterproof structure for a throttle body comprising a breathing hole communicating with a storage space for a valve body driving system component formed in a body main body. Forming a maze by a through hole penetrating from the storage space to the intake manifold mating surface of the body main body, and a groove located along the intake manifold mating surface from the through hole and having an end communicating with the outside air, Further, an outlet of the through hole to the intake manifold mating surface is formed to protrude from the bottom surface of the groove toward the intake manifold mating surface.

Here, the groove is constituted by an annular groove surrounding the outlet of the through hole and at least two linear grooves formed substantially symmetrically with the annular groove interposed therebetween.

Alternatively, the groove includes an annular groove surrounding the outlet of the through hole, and at least two meandering grooves formed substantially symmetrically with the annular groove interposed therebetween.

The outlet of the through hole has an outward flange at the tip.

Further, the groove is subjected to a water-repellent treatment or a hydrophilic treatment.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an electronic throttle body according to a first embodiment. FIG. 1 is a front view of the throttle body as viewed from the intake manifold side, and a part of the front view is shown in cross section. FIG. 2 is a side view of the throttle body, in which a lid covering a storage space for a valve body driving system component is removed, and FIG. 3 is a view AA in FIG.
FIG. 4 is a sectional view taken along the line BB in FIG. 1, and FIG. 5 is a side view of the throttle body.

1 to 5, the electronic throttle body has a body 1. An intake manifold 2 is arranged on the front side of FIG.
, An intake passage 3 communicating with an internal combustion engine body (not shown) is formed. A valve 4 is provided in the intake passage 3, and the flow rate of intake air supplied to the internal combustion engine body is controlled by the opening degree of the valve 4.

The body 1 has a motor (DC motor) 5 and a valve gear 6 on its side.
A housing space 9 for housing a valve body drive system component 8 for driving the valve shaft 7 is formed, and the housing space 9 is covered with a lid 10.
The storage space 9 includes a motor chamber 11 that houses the electric motor 5 and a gear chamber 13 that houses a power transmission mechanism 12 such as the valve gear 6. The motor chamber 11 communicates with the gear chamber 13.

A groove 15 is formed in the intake manifold mating surface 14 of the body 1. The groove 15 has an upwardly convex curved groove portion 17 formed so as to surround the intake manifold mounting hole 16a by about a half circumference, and the upwardly convex curved groove portion 17.
And a linear groove 18 extending upward from the upper end of the groove. Then, both ends 19 and 20 of the upwardly convex curved groove portion 17 are
When the intake manifold 2 is fixed to the body main body 1 by fitting the intake manifold 2 to the intake manifold mating surface 14 of the body 1 via the gasket 21 and inserting fittings (not shown) into the respective mounting holes 16a to 16d. , And is configured to communicate with the outside air. further,
The body main body 1 is formed with a through hole 22 penetrating from the gear chamber 13 to the upper end of the linear groove 18. The groove 15 and the through hole 22 constitute a breathing hole 23, and since the groove 15 has a shape that extends relatively vertically and vertically as described above, the breathing hole 23 forms a maze. I can say.

Further, the bottom of the gear chamber 13 of the body 1 is provided on the bottom wall 24 of the gear chamber 13 when there is water in the gear chamber 13.
A drain hole 25 for draining the water in 3 smoothly is formed.

The power transmission mechanism 12 includes a valve gear 6 fixed to one end of a valve shaft 7. The valve gear 6 has a gear portion 26 on the outer periphery of the large diameter, and the gear portion 26
7 are meshed with each other. The large-diameter gear portion 29 of the intermediate gear 27 meshes with a motor output gear 30 fixed to the output shaft of the motor 5. The valve gear 6 is coupled to a bush 31 rotatably supported on the body 1 side by a coupling spring 32. The bush 31 has an intermediate contact portion 34 that can contact an intermediate stopper 33 provided on the body 1 side.
The intermediate contact portion 34 is pressed against the intermediate stopper 33 by the spring force of the return spring 35 provided between the bush 31 and the body 1, and the valve gear 6 holds the valve 4 slightly open. The valve gear 6 has a fully closed contact portion 37 that can be brought into contact with a fully closed stopper 36 provided on the body 1 side. When the electric motor 5 rotates in the reverse direction from the state where the intermediate contact portion 34 of the bush 31 is in contact with the intermediate stopper 33, the valve gear 6 is disengaged from the bush 31 and the fully closed contact portion 37 contacts the fully closed stopper 36. It can rotate until it touches, during which idle speed control is performed. The valve gear 6 has a full-open contact portion 39 that can contact a full-open stopper 38 provided on the body 1 side to limit the full-open angle of the valve 4.

In the electronic throttle body constructed as described above, when the electric motor 5 is not energized, the bush 31 is moved by the spring force of the return spring 35 to the intermediate contact portion 34.
Are held in contact with the intermediate stopper 33.
At this time, the valve gear 6 is coupled to the bush 31 by the coupling spring 32, and the valve 4 is maintained in a slightly opened state than the fully closed state. When the motor 5 starts normal rotation from this state, the forward rotation torque of the motor 5 is transmitted from the motor output gear 30 to the valve gear 6 via the large-diameter gear portion 29 and the small-diameter gear portion 28 of the intermediate gear 27, and the valve gear 6 Is opposed to the spring force of the return spring 35 and the coupling lever 40 fixed to the valve gear 6
While pushing 1 in a counterclockwise direction, it rotates together with the bush 31, whereby the valve shaft 7 rotates and the valve 4 opens. Then, the opening of the valve 4 is stabilized in a state where the forward rotation torque of the electric motor 5 and the spring force of the return spring 35 are balanced.

Further, even when high-pressure water is applied to the breathing hole 23 and high-pressure water intrudes from the side opening 19 of the upwardly convex curved groove portion 17 when cleaning the interior of the engine room of the vehicle with high pressure, the water is not removed. The lower surface opening 2 through the convex curved groove 17
Since the water is easily discharged from zero, there is less possibility that water will enter the gear chamber 13 through the upwardly convex curved groove portion 17, the linear groove portion 18, and the through hole 22 in this order. The same applies to the case where high-pressure water infiltrates from the lower opening 20 of the upwardly convex groove 17, but since the high-pressure water is usually applied to the throttle body from above or from the side of the throttle body, the upwardly convex curve is formed. The probability that high-pressure water enters from the lower surface opening 20 of the groove 17 is low. Further, since the drain hole 25 is formed in the bottom wall 24 of the gear chamber 13, the probability that high-pressure water is applied is sufficiently low.
Even if the water enters the water 3, since the breathing hole 23 is open to the outside air, it is possible to drain the water smoothly.

The breathing hole 23 is provided with a through hole 22 penetrating from the gear chamber 13 to the intake manifold mating surface 14.
Is formed by the groove 15 extending downward from the through hole 22 along the intake manifold mating surface 14 and having the ends 19 and 20 communicating with the outside air. Can be obtained by:

FIGS. 6 to 9 show an electronic throttle body according to a second embodiment. FIG. 6 is a front view of the throttle body as viewed from the intake manifold side, and a part of the front is shown in a cross section. 7 is a side view of the throttle body, FIG. 8 is a sectional view taken along line AA of FIG. 6, and FIG.
It is illustration BB sectional drawing.

6 to 9, a through hole 22 penetrating through the motor chamber 11 is formed on the intake manifold mating surface 14 side of the body main body 1. Further, an L-shaped wall portion 43 whose end surface 42 is flush with the intake manifold mating surface 14 is formed in the wall portion 41 forming the motor chamber 11. The L-shaped wall portion 43 includes a side wall portion 44 that covers one side surface of the through hole 22 and a bottom wall portion 45 that extends substantially horizontally below the through hole 22 from the lower end of the side wall portion 44. . The end surface 42 of the L-shaped wall portion 43 is aligned with the intake manifold 2 via the gasket 21 on the intake manifold mating surface 14, and a mounting bracket (not shown) is inserted into each of the mounting holes 16 a to 16 d so that the intake manifold 2 is inserted. When fixed to the body 1, it comes into contact with the back surface of the gasket 21. At this time, the L-shaped wall 43 forms an open air space 46 together with the wall 41 of the motor chamber 11 and the gasket 21. The breathing hole 23 is constituted by the through hole 22 and the open space 46.

Further, when water is immersed in the gear chamber 13, the gear chamber 1 is provided on the bottom wall 24 of the gear chamber 13 of the body 1.
A drain hole 25 for draining the water in 3 smoothly is formed. The other configuration is the same as that of the first embodiment.

High-pressure water, such as when cleaning the inside of the engine room with high pressure, is blocked by the gasket 21 and hardly permeates into the breathing hole 23. Further, the high-pressure water flowing upward from the lower end side of the gasket 21 is blocked by the L-shaped wall 43 and hardly enters the breathing hole 23. Even if high-pressure water intrudes into the open-to-atmosphere space 46 from below the gasket 21, the through-hole 22 is located above the bottom wall 45 of the L-shaped wall 43 and enters the motor chamber 11 through the through-hole 22. In addition, the water can be smoothly drained to the outside along the bottom wall 45. The drain hole 25 is provided in the gear chamber 13.
Formed on the bottom wall 24, the probability that high-pressure water is applied is sufficiently low, and even if high-pressure water enters the gear chamber 13 through the drain hole 25, the breathing hole 23 is open to the outside air. Can be drained smoothly.

FIGS. 10 and 11 show a mechanical throttle body according to a third embodiment. FIG. 10 is a front view of the throttle body, and FIG. 11 is a side view of the throttle body.

10 and 11, the mechanical throttle body has a body 1. An intake manifold 2 is arranged on the front side of the body main body 1 in FIG. 10, and an intake passage 3 communicating with an internal combustion engine main body (not shown) is formed in the body main body 1. And this intake passage 3
A valve 4 is disposed in the air conditioner, and the flow rate of intake air supplied to the internal combustion engine body is controlled by the opening degree of the valve 4. The valve shaft 7 of the valve 4 is rotated by a throttle lever 47 linked to an accelerator pedal (not shown), and the rotation of the valve shaft 7 opens and closes the valve 4. An idle speed control valve 48 is attached to the lower side of the body 1.

A storage space (sensor chamber) for accommodating a throttle opening sensor 49 (a sensor system component but included in the valve driving system component in this specification) is provided on a side surface of the body 1.
The sensor chamber 50 is covered by a lid 51.

On the intake manifold mating surface 14 of the body 1, the sensor chamber 50
Are formed through two through holes 22 and 52.
The lower through hole 52 is located below the sensor chamber 50. The intake manifold fitting surface 14 of the body 1 has a vertical groove 53 extending downward from the upper through hole 22 and a horizontal groove extending horizontally from the lower end of the vertical groove 53 to the periphery of the intake manifold fitting surface 14. And an L-shaped groove 55 composed of
An L-shaped groove 58 is formed, which includes a vertical groove 56 extending downward from 2 and a horizontal groove 57 extending horizontally from the lower end of the vertical groove 56 to the periphery of the intake manifold mating surface 14. The upper through-hole 22 and the L-shaped groove 55 constitute the breathing hole 23, and the lower through-hole 52
And the L-shaped groove 58 constitute the drain hole 25. It can be said that the breathing hole 23 and the drainage hole 25 form a maze because the grooves 55 and 58 are L-shaped as described above.
Gasket 2 is placed on intake manifold mating surface 14.
The intake manifold 2 is fixed via the first intake manifold 1.

The high-pressure water that has entered the L-shaped groove 55 of the breathing hole 23 or the L-shaped groove 58 of the drain hole 25 when the inside of the engine room is washed with a high pressure is subjected to the upper ends of the L-shaped grooves 55 and 58. Since the through holes 22 and 52 are located in the
It becomes difficult to infiltrate the sensor chamber 50 from the holes 5 and 58 through the through holes 22 and 52. Even if high-pressure water enters the sensor chamber 50, the breathing hole 23 is open to the outside air, so that drainage can be performed smoothly.

FIGS. 12 to 14 show an electronic throttle body according to a fourth embodiment. FIG. 12 is a front view of the throttle body, FIG. 13 is a side view of the throttle body, and FIG. It is -A sectional drawing.

12 to 14, a breathing hole 23 communicating with the gear chamber 13 is formed in the motor housing of the body 1.

The breathing hole 23 has a downwardly facing hole 5
9, a passage 60 extending from the upper end of the downward hole 59 to the gear chamber 13 in a substantially horizontal direction, and an upward hole 61 extending upward from the end of the passage 60 and opening to the gear chamber 13 to form a maze. I have. The upward hole 61 is in the gear chamber 1
U-shaped rib 6 projecting forward from the vertical wall 62
3 is formed by closing the front opening with a vertical plate 64.

Further, a drain hole 25 is formed in the bottom wall 24 of the gear chamber 13 for draining water in the gear chamber 13 smoothly when water is immersed in the gear chamber 13. The other configuration is the same as that of the first embodiment.

High-pressure water, such as when the inside of the engine room is washed with high pressure, is supplied to the gear chamber 1 by the downward hole 59 of the breathing hole 23.
3 hardly penetrates. Even if it enters the passage 60 through the downward hole 59, it does not easily enter the gear chamber 13 by the upward hole 61. Further, since the drain hole 25 is formed in the bottom wall 24 of the gear chamber 13, the probability that high-pressure water is applied is sufficiently low, and even if high-pressure water enters the gear chamber 13 through the drain hole 25, breathing occurs. Since the hole 23 is open to the outside air, the inundation can be smoothly drained.

15 to 17 show an electronic throttle body according to a fifth embodiment. FIG. 15 is a sectional view of the throttle body, and FIG. 16 is a side view of the throttle body, a part of which is shown in a sectional view. FIG. 17 is a front view of the throttle body as viewed from the intake manifold side.

15 to 17, a groove 71 is formed on the intake manifold mating surface 14 side of the body 1. The groove 71 has an annular groove 74 surrounding the outlet 73 of the through hole 72 penetrating from the gear chamber (storage space for the valve body drive system components) 13 to the intake manifold mating surface 14.
And a linear groove 75 extending downward from the annular groove 74. As shown in FIG. 16, the outlet 73 of the through hole 72 is formed so as to protrude from the bottom surface 76 of the annular groove 74 toward the intake manifold mating surface 14.
At the lower end of the straight groove portion 75, an intake manifold (not shown) is fitted to the intake manifold mating surface 14 via a gasket 21, and a mounting bracket (not shown) is inserted into each of the mounting holes 16a to 16d so that the intake manifold is inserted. When fixed to the body 1, it communicates with the outside air.

As described above, in the fifth embodiment, the breathing hole 77 is formed by the through hole 72 penetrating from the storage space 13 to the intake manifold mating surface 14 of the body 1, and from the through hole 72 to the intake manifold mating surface 14. And a groove 71 whose end communicates with the outside air forms a maze. An outlet portion 73 of the through hole 72 to the intake manifold mating surface 14 is formed so as to protrude from the bottom surface 76 of the groove 71 toward the intake manifold mating surface 14. For this reason, at the time of high pressure washing, etc., water hardly penetrates to the periphery of the outlet 73 of the through hole 72 first,
Even if water invades around the outlet 73, it does not easily enter the outlet 73 of the through hole 72.

FIGS. 18 to 22 show a throttle body according to a sixth embodiment. FIG. 18 is a front view of the throttle body as viewed from the intake manifold side, and FIG.
Is a perspective view of a main part of the throttle body, and FIGS.
3 is a configuration diagram of a main part of each groove.

18 to 22, a groove 81 is formed in the body main body 1 on the side of the intake manifold mating surface 14. As shown in FIG. The groove 81 has an annular groove portion 84 surrounding the outlet portion 83 of the through hole 82 penetrating from the gear chamber (storage space for the valve body drive system components) 13 to the intake manifold mating surface 14.
And an upper linear groove 85 and a lower linear groove 86 extending upward and downward from the annular groove 84, respectively. As shown in FIG. 19, the outlet portion 83 of the through hole 82 is formed so as to protrude from the bottom surface 87 of the annular groove portion 84 toward the intake manifold mating surface 14 side. The upper end of the upper straight groove portion 85 and the lower end of the lower straight groove portion 86 are respectively fitted to the intake manifold mating surface 14 with the gasket 21.
When the intake manifold (not shown) is fitted through the fitting holes (not shown) in the respective mounting holes 16a to 16d, and the intake manifold is fixed to the body main body 1, the intake manifold communicates with the outside air.

As described above, in the sixth embodiment, the breathing hole 88 is formed by the through hole 82 penetrating from the storage space 13 to the intake manifold fitting surface 14 of the body 1, and from the through hole 82 to the intake manifold fitting surface 14. A maze is formed by the groove 81 which is located along and has an end communicating with the outside air. An outlet portion 83 of the through hole 82 to the intake manifold mating surface 14 is formed to protrude from the bottom surface 87 of the groove 81 toward the intake manifold mating surface 14. Further, the groove 81 includes an annular groove 84 surrounding the outlet 83 of the through hole 82 and the annular groove 8.
4, two linear grooves 85 formed substantially symmetrically with respect to
86. For this reason, as shown in FIG. 19, even when water enters one of the linear grooves 85 or 86 during high-pressure cleaning or the like, the water that has entered the other linear groove 86 or 8 does not.
5, it is difficult to enter the outlet portion 83 of the through-hole 82 because it is smoothly discharged from the hole 5. Also, depending on the mounting type of the throttle body, as shown in FIG.
When the 86 is in the horizontal state, the water level of the water that has entered the annular groove portion 84 is located below the opening of the outlet portion 83 of the through hole 82, so that the penetration of the through hole 82 into the outlet portion 83 can be prevented. Also, as shown in FIG. 21, when the intake manifold mating surface 14 is located on the upper side, the height of the outlet portion 83 of the through hole 82 is set to the height due to the surface tension of water (about 3 m).
By setting a value larger than m), it is possible to prevent water from entering the outlet 83. Further, as shown in FIG. 22, when the intake manifold mating surface 14 is located on the lower side, the height from the intake manifold mating surface 14 to the outlet 83 is set to be larger than the height due to the surface tension of water. This can prevent water from entering the outlet 83.

FIGS. 23 to 26 show a throttle body according to the seventh embodiment. FIG. 23 is a front view of the throttle body as viewed from the intake manifold side, and FIGS.
FIG. 26 is a configuration diagram of a main part of each groove.

23 to 26, a groove 91 is formed in the body main body 1 on the side of the intake manifold mating surface 14. As shown in FIG. The groove 91 is configured similarly to the groove 81 of the sixth embodiment. However, upper and lower grooves extending upward and downward from the annular groove 92 are meandering grooves 93, respectively.
94 has been replaced. As shown in FIGS. 23 to 26, the meandering groove 93 located on the upper side based on the mounting type of the throttle body always has a height
3 is formed to be higher than the height position of the tip, so that water is trapped in the middle of the pipeline and does not reach the outlet 96 of the through hole 95. In the case where the number of the meandering grooves 93 and 94 is two, as shown in FIG. 27, even if the tips of the meandering grooves 93 and 94 are aligned horizontally, both meandering grooves 93 and 94 are simultaneously formed.
The tips of the grooves 93 and 94 are opened in the opposite directions to each other so as not to trap water. Therefore, according to the seventh embodiment as well, it is possible to prevent water from entering the outlet portion 96 of the through hole 95 as in the sixth embodiment.

The through holes 72, 8 in the fifth to seventh embodiments
As shown in FIG. 28, the outlet portions 73, 83, and 96 of 2, 95 may be configured to have outward flange portions 78, 89, 97 at the ends. In this case, intrusion of water can be further prevented. The flanges 78, 89, and 97 can be formed by crushing the distal end surfaces of the outlets 73, 83, and 96 by rolling, heat, ultrasonic waves, or the like, or fixing another member with an adhesive or the like.

In the sixth and seventh embodiments, FIG.
Alternatively, as shown in FIG. 30, appropriate portions of the grooves 81 and 91 are formed in order to form a flow path of the water so that water entering the grooves 81 and 91 does not flow toward the outlets 83 and 96 of the through holes 82 and 95. When the portions 90 and 98 are formed by applying a water repellent or hydrophilic agent to the through holes, the intrusion of water into the outlets 83 and 96 of the through holes 82 and 95 can be further prevented.

[0049]

According to the present invention, it is possible to provide a waterproof structure which can be manufactured by simple processing without increasing the number of parts and which can prevent water from entering the housing space.

[Brief description of the drawings]

FIG. 1 is a front view of an electronic throttle body according to a first embodiment when viewed from an intake manifold side, and is a front view partially showing a cross section.

FIG. 2 is a side view of the throttle body, with a lid covering a storage space for a valve body drive system component removed, in a state where the lid is removed.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is a sectional view taken along the line BB in FIG. 1;

FIG. 5 is a side view of the throttle body.

FIG. 6 is a front view of the electronic throttle body according to the second embodiment when viewed from the intake manifold side, and is a front view partially illustrating the cross section;

FIG. 7 is a side view of the throttle body.

8 is a sectional view taken along the line AA in FIG. 6;

9 is a sectional view taken along the line BB in FIG. 6;

FIG. 10 is a front view of a mechanical throttle body according to a third embodiment.

FIG. 11 is a side view of the throttle body.

FIG. 12 is a front view of a throttle body of an electronic throttle body according to a fourth embodiment.

FIG. 13 is a side view of the throttle body.

14 is a sectional view taken along the line AA in FIG.

FIG. 15 is a sectional view of an electronic throttle body according to a fifth embodiment.

FIG. 16 is a side view showing a part of the throttle body in a cross section.

FIG. 17 is a front view of the throttle body as viewed from the intake manifold side.

FIG. 18 is a front view of the throttle body according to the sixth embodiment when viewed from an intake manifold side.

FIG. 19 is a perspective view of a main part of the throttle body.

FIG. 20 is a configuration diagram of a main part of a groove.

FIG. 21 is a configuration diagram of a main part of the groove.

FIG. 22 is a configuration diagram of a main part of the groove.

FIG. 23 is a front view of the throttle body according to the seventh embodiment when viewed from the intake manifold side.

FIG. 24 is a configuration diagram of a main part of a groove.

FIG. 25 is a configuration diagram of a main part of the groove.

FIG. 26 is a configuration diagram of a main part of the groove.

FIG. 27 is a configuration diagram of a main part of a meandering groove.

FIG. 28 is a configuration diagram of an outlet of a through hole.

FIG. 29 is a perspective view of a main part showing a modification of the sixth and seventh embodiments.

FIG. 30 is an essential part perspective view showing another modified example of the sixth and seventh embodiments.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body main body 9, 11, 13, 50 Storage space 14 Intake manifold fitting surface 15, 55, 58, 71, 81, 91 Groove 21 Gasket 22, 52, 72, 82, 95 Through hole 23, 77, 88 Breathing hole 25 Drain hole 42 End face of L-shaped wall 43 L-shaped wall 44 Side wall 45 Bottom wall 46 Open air space 59 Downward hole 60 Passage 61 Upward hole 73, 83, 96 Outlet 74, 84, 92 Annular groove 75, 85, 86 Straight grooves 93, 94 Meandering grooves 78, 89, 98 Outward flanges

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G065 AA11 CA00 CA23 DA05 DA15 GA46 HA06 HA12 HA19 HA21 HA22 KA02 KA13 KA15 KA16

Claims (9)

[Claims] 1. A waterproof structure for a throttle body, comprising: a drain hole communicating with a storage space for a valve body driving system component formed in a body main body; and a breathing hole communicating with the storage space. The drain hole is located below the storage space when mounted on the vehicle, and the breathing hole is a through hole that penetrates from the storage space to an intake manifold mating surface of the body main body, and the intake manifold is formed from the through hole. A waterproof structure for a throttle body, wherein a maze is formed by a groove located along a mating surface and an end portion communicating with outside air. 2. A waterproof structure for a throttle body, comprising: a drain hole communicating with a storage space for a valve body drive system component formed in a body main body; and a breathing hole communicating with the storage space. The drain hole is located below the storage space when mounted on a vehicle, and the breathing hole is a through hole that penetrates from the storage space to an intake manifold mating surface side of the body main body, and an open air space. A side wall portion covering one side surface of the through hole, and a bottom wall portion extending substantially horizontally below the through hole from a lower end of the side wall portion, and an end surface thereof is flush with the intake manifold mating surface. A slot formed by an L-shaped wall and a gasket attached to the end face of the L-shaped wall and the intake manifold mating surface. Waterproof structure of Torubodi. 3. A waterproof structure for a throttle body, comprising: a drain hole communicating with a storage space for a valve body driving system component formed in a body main body; and a breathing hole communicating with the storage space. A drain hole is located below the storage space on the vehicle, and the drain hole and the breathing hole are each a through hole penetrating from the storage space to an intake manifold mating surface of the body main body. A waterproof structure for a throttle body, wherein a maze is formed by a groove extending from the through hole along the mating surface of the intake manifold and having an end located below the through hole and communicating with outside air. 4. A waterproof structure for a throttle body, comprising: a drain hole communicating with a storage space for a valve body driving system component formed in a body main body; and a breathing hole communicating with the storage space. The drain hole is located below the storage space on the vehicle, and the breathing hole is located in the storage space of the valve body drive system component of the body main body and opens downward to the outside. A waterproof structure for a throttle body, wherein a maze is formed by a passage communicating with the hole and extending substantially horizontally toward the storage space, and an upward hole extending upward from the end of the passage and opening to the storage space. . 5. A waterproof structure for a throttle body, comprising a breathing hole communicating with a storage space for a valve body driving system component formed in a body main body, wherein the breathing hole extends from the storage space to the body main body. A maze is formed by a through hole penetrating the intake manifold mating surface, and a groove located along the intake manifold mating surface from the through hole and having an end communicating with the outside air, and furthermore, an intake manifold mating surface of the through hole. A waterproof structure for a throttle body, characterized in that an outlet portion of the throttle body protrudes from the bottom surface of the groove toward the intake manifold mating surface side. 6. The groove is constituted by an annular groove surrounding the outlet of the through hole and at least two straight grooves formed substantially symmetrically with the annular groove interposed therebetween. A waterproof structure for a throttle body according to claim 5. 7. The groove is constituted by an annular groove surrounding the outlet of the through hole and at least two meandering grooves formed substantially symmetrically with respect to the annular groove. A waterproof structure for a throttle body according to claim 5. 8. The waterproof structure for a throttle body according to claim 6, wherein the outlet portion of the through hole has an outward flange portion at a tip. 9. The waterproof structure for a throttle body according to claim 6, wherein the groove is subjected to a water-repellent treatment or a hydrophilic treatment.