JP2001271660A - Throttle body and throttle device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throttle body for preventing the fluid for heating a ring-like member from leaking for surely heating the ring-like member and a throttle device using it. SOLUTION: A metal ring-like member 20 is installed in insertion mold method in the intake wall of a body 11 for forming an intake passage 11a. The body 11 and the ring-like member 20 constitute a throttle body. The ring- like member 20 has a projection section 21, exposed from the body 11 projected from the body 11 in the radial direction. The projection section 21 is formed with a fluid passage 22 penetrating the projection section 21. Since hot water passes through the fluid passage 22 for directly heating the ring-like member 20, the heat of the hot water tends to conduct easily. Since an inlet port 22a and an outlet port 22b of the fluid passage 22 open, facing the projection section 21 which is the external wall of the ring-like member 20 exposed from the body 11, hot water will not leak from the boundary of the body 11 and the ring-like member 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle body having a resin body and a throttle device for adjusting an intake flow rate of an internal combustion engine using the same (hereinafter referred to as an "internal combustion engine").

[0002]

2. Description of the Related Art There is known a throttle device which adjusts an intake flow rate flowing through an intake passage by rotating a disk-shaped valve member, in which a body of a throttle body is formed of resin to reduce the weight of the throttle device. Have been.
However, since the resin body has a low thermal conductivity, a metal ring covering the outer periphery of the valve member is attached to the inner wall of the intake, and this metal ring is heated with hot water or the like, so that the valve member and the inner wall of the intake are kept at a low temperature. Freezing, so-called icing is prevented.

[0003]

However, if a fluid passage for passing hot water is formed between the outer wall of the metal ring and the resin body, there is a risk that hot water leaks from the boundary between the metal ring and the body. However, it is difficult to seal between the metal ring that is usually formed by insert molding and the resin body.

In the throttle device disclosed in Japanese Patent Laying-Open No. 4-119352, a concave portion is formed in the outer wall of a metal ring, and a fluid pipe for passing hot water is fitted into the concave portion. Leakage of hot water to the boundary between However, depending on the fitting state, the recess and the fluid pipe may not make surface contact, and the contact area may be small. When the contact area is small, the heat of the hot water is not easily transmitted to the metal ring. SUMMARY OF THE INVENTION An object of the present invention is to provide a throttle body that reliably prevents the leakage of a fluid that heats an annular member and heats the annular member, and a throttle device using the same.

[0005]

According to the throttle body of the first aspect of the present invention, an annular member having a higher thermal conductivity than the resin body body is attached to the inner wall of the intake air.
The annular member has a fluid passage passing through the inside of the annular member,
The fluid inlet and the fluid outlet of the fluid passage open to the outer wall of the annular member exposed from the body main body. By attaching a pipe for supplying a fluid to the fluid inlet of the annular member and discharging a fluid from the fluid outlet to the annular member, the fluid is prevented from leaking to the boundary between the body body and the annular member. Further, since the fluid passes through the fluid passage formed inside the annular member and directly heats the annular member, heat is easily transmitted to the annular member.

According to the throttle body according to the second, third or fourth aspect of the present invention, an annular member having a higher heat conductivity than the resin body body is attached to the intake inner wall. A cover member that forms a fluid passage with the outer wall of the annular member is provided on the outer peripheral side of the annular member. Since the space between the annular member and the cover member is sealed by the seal member, it is possible to prevent the fluid from leaking to the boundary between the body body and the annular member. Further, since the fluid directly contacts the outer wall of the annular member and heats the annular member, heat is easily transmitted to the annular member. According to the throttle device described in claim 5 of the present invention, since the throttle body described in any one of claims 1 to 4 is used,
By supplying fluid to the fluid passage and heating the annular member, icing can be prevented from occurring.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 1 shows a first embodiment of the present invention. The throttle device 10 electrically controls a throttle opening in accordance with engine operating conditions such as an accelerator opening, an engine speed, an engine load, and a water temperature, and adjusts an intake flow rate flowing through an intake passage 11 a formed in the body 11. Things.
The body main body 11 is integrally formed of resin. The state shown in FIG. 1 is a fully closed state of the throttle device 10.

Body body 11 forming intake passage 11a
A metal annular member 20 is attached to the inner wall of the intake by insert molding. Body body 11 and annular member 2
0 constitutes the throttle body. Intake passage 11a
The bearing 1 is mounted on the body 11 on the opposite side in the radial direction with the
5 and 16 are attached. Both ends of the throttle shaft 12 are supported by bearings 15 and 16, respectively. The throttle shaft 12 is rotatably supported by the body 11 via bearings 15 and 16. Valve member 13
Is formed in a disc shape, and is fixed to the throttle shaft 12 by screws 14. Throttle shaft 12 and valve member 1
3 and rotates together.

The annular member 20 is attached to the inner wall of the intake so as to surround the outer periphery of the valve member 13 when the throttle device 10 shown in FIG. The annular member 20 has a protrusion 21 that protrudes radially outward from the body main body 11 and is exposed from the body main body 11. In the protrusion 21,
A fluid passage 22 penetrating the protrusion 21 is formed. In the projection 21, an inlet pipe 25 is connected to the fluid inlet 22a side of the fluid passage 22, and an outlet pipe 26 is connected to the fluid outlet 22b side. The hot water introduced from the inlet pipe 25 passes through the fluid passage 22 and is discharged from the outlet pipe 26.

The throttle gear 30 is formed in a semi-circular shape and is fixed to the throttle shaft 12 by a bolt 17 so as not to rotate. The locking member 35 is formed in a circular shape. The locking member 35 engages with the throttle gear 30 on the side facing the throttle gear 30 and rotates together with the throttle gear 30. The spring 36 has one end fixed to the body 11 and the other end fixed to the locking member 35. The spring 36 urges the throttle gear 30 and the locking member 35 in the valve closing direction of the valve member 13. The locking member 35 is locked by a fully closed stopper (not shown) of the body main body 11 in the fully closed position, and the rotation in the valve closing direction is restricted. The position of the fully closed stopper is the fully closed position of the throttle opening. The intermediate gear 38 has small diameter gear teeth 38a and large diameter gear teeth 38b. The small diameter gear teeth 38a mesh with the gear teeth 30a of the throttle gear 30, and the large diameter gear teeth 38b
The gear teeth 51a of the motor gear 51 of the motor 50 are engaged.

The motor 50 as a driving means is, for example, a DC
The motor is attached to the body 11.
The rotation of the motor 50 causes the throttle shaft 12 and the valve member 13 via the intermediate gear 38 and the throttle gear 30 to rotate.
, The driving force of the motor 50 is applied to adjust the throttle opening. The cover 55 covers each gear and the motor 50.

The rotation angle sensor 60 is attached to the body main body 11 opposite to the throttle gear 30 with the intake passage 11a interposed therebetween. The sensor lever 61 is fixed to the throttle shaft 12 by a bolt 18. Sensor lever 6
1 rotates together with the throttle shaft 12, so that the rotation angle sensor 60 detects the throttle opening.

The throttle opening detected by the rotation angle sensor 60 is sent to an engine control unit (ECU) not shown. The ECU controls an engine operating state such as an engine speed, an engine load, an accelerator opening, a water temperature and the like, and a current value sent to the motor 50 in accordance with a detection signal of the rotation angle sensor 60 to adjust a throttle opening. The driving force of the motor 50 acts on the throttle gear 30 in a direction opposite to the urging force of the spring 36, that is, in a valve opening direction.

In the first embodiment, since the fluid passage 22 is formed in the projection 21 formed integrally with the annular member 20 and the hot water is passed through the fluid passage 22, the annular member 20 has a small number of parts.
Can be heated. Further, since warm water passes through the fluid passage 22 penetrating the protrusion 21 and directly heats the annular member 20, heat of the warm water is easily transmitted to the annular member 20. Therefore, occurrence of icing in the throttle device 10 can be prevented.

Further, since the fluid inlet 22a and the fluid outlet 22b of the fluid passage 22 are open to the projection 21 which is the outer wall of the annular member 20 exposed from the body 11, the body 11 and the annular member 20 are connected to each other. Hot water does not flow on the border of Therefore, it is possible to prevent the hot water from leaking to the boundary between the body 11 and the annular member 20.

In the first embodiment, the annular member 2 is formed integrally.
The protrusion 21 was formed at 0. On the other hand, the annular member 20 is formed by connecting the projection to the annular member main body surrounding the valve member 13 by welding or the like, and the fluid passage 2 passing through the inside of the annular member 20 is formed.
2 may be formed. Also, an inlet pipe 25 and an outlet pipe 26
May be constituted by an integral pipe.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
Shown in Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals. The metal annular member 70 is insert-molded in the body main body 11 so as to surround the outer periphery of the valve member 13.
A through hole 11b is formed in the body main body 11 at a position where the outer wall of the annular member 70 is exposed. The cover member 75 includes a plate portion 76 and an annular member 7 that passes through the through hole 11b from the plate portion 76.
And a frame portion 77 as a passage member protruding toward the outer wall 0. The body main body 11, the annular member 70, and the cover member 75 constitute a throttle body. Frame part 7
7 is a closed rectangular shape. Frame 77 and annular member 70
Is sealed by a rubber seal member 78. A fluid passage 80 is formed by the cover member 75 and the annular member 70. The fluid inlet 80a and the fluid outlet 80b of the fluid passage 80 are formed penetrating the plate portion 76, and open at a position away from the body main body 11. Plate 76
The inlet pipe 2 at the fluid inlet 80a side of the fluid passage 80.
5. The outlet pipe 26 is connected to the fluid outlet 80b side. The hot water introduced from the inlet pipe 25 passes through the fluid passage 80 and is discharged from the outlet pipe 26.

The frame member 77 of the annular member 70 and the cover member 75
The seal member 78 seals the space between the annular member 70 and the fluid passage 80 formed by the annular member 70 and the cover member 75, so that the annular member 70 can be directly heated by the warm water. Therefore, the heat of the hot water is easily conducted to the annular member 70. Further, since the fluid inlet 80a and the fluid outlet 80b of the fluid passage 80 are open at positions away from the body main body 11, hot water does not flow through the boundary between the body main body 11 and the annular member 70. Therefore, it is possible to prevent the hot water from leaking to the boundary between the body 11 and the annular member 70.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
Shown in Components that are substantially the same as in the second embodiment are given the same reference numerals. The metal annular member 90 is insert-molded in the body main body 11 so as to surround the outer periphery of the valve member 13.
The annular member 90 has an annular portion 91 and a frame portion 92 as a passage member that passes through the through hole 11b and protrudes radially outward from the annular portion 91. The body body 11, the annular member 90, and the cover member 95 constitute a throttle body. The frame portion 92 is formed in a closed rectangular shape. The cover member 95 is formed in a plate shape. Frame 92
A seal member 78 seals between the cover member 95 and the cover member 95. The fluid passage 80 is formed by the annular member 90 and the cover member 95. Fluid inlet 80a of fluid passage 80
The fluid outlet 80b is formed to penetrate the cover member 95, and is opened at a position away from the body main body 11. The cover member 95 has a fluid inlet 8 of the fluid passage 80.
0a side, inlet pipe 25, fluid outlet 80b side, outlet pipe 2
6 are connected to each other. The hot water introduced from the inlet pipe 25 passes through the fluid passage 80 and is discharged from the outlet pipe 26.

The frame portion 92 of the annular member 90 and the cover member 95
The seal member 78 seals the gap between the annular member 90 and the fluid passage 80 formed by the annular member 90 and the cover member 95, so that the annular member 90 can be directly heated by the warm water. Therefore, heat of the warm water is easily conducted to the annular member 90. Further, since the fluid inlet 80a and the fluid outlet 80b of the fluid passage 80 are open at positions away from the body main body 11, hot water does not flow through the boundary between the body main body 11 and the annular member 90. Therefore, it is possible to prevent hot water from leaking to the boundary between the body 11 and the annular member 90.

In the embodiments of the present invention described above, the annular member is made of metal.
If the thermal conductivity is higher than 1, for example, the annular member may be formed of a material in which metal powder is mixed into a resin material. Further, the ring member is heated by supplying the liquid hot water to the fluid passage, but the ring member may be heated by a gas such as steam. In the above embodiments, the valve member 13 is driven by the driving force of the motor 50. However, the valve member 13 may be driven by an accelerator wire.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a throttle device according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a periphery of a fluid passage of a throttle body according to a second embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view illustrating a periphery of a fluid passage of a throttle body according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Throttle device 11 Body main body 12 Throttle shaft 13 Valve member 20 Annular member 21 Projection 22 Fluid passage 22a Fluid inlet 22b Fluid outlet 25 Inlet piping 26 Outlet piping 50 Motor (drive means) 70 Annular member 75 Cover member 77 Frame (passage) 78) Seal member 80 Fluid passage 80a Fluid inlet 80b Fluid outlet 90 Annular member 92 Frame (passage member)

Claims (5)

[Claims] 1. An annular member, comprising: a resin body having an intake passage; and an annular member attached to an intake inner wall of the body forming the intake passage and having higher thermal conductivity than the body. A throttle body having a fluid passage passing through the inside of the annular member, wherein a fluid inlet and a fluid outlet of the fluid passage are opened on an outer wall of the annular member exposed from the body main body. 2. A resin body having an intake passage, an annular member attached to an intake inner wall of the body forming the intake passage, and having a higher thermal conductivity than the body main body; A cover member disposed on the outer peripheral side to form a fluid passage with the outer wall of the annular member; and a seal member for sealing between the outer wall of the annular member and the cover member. A throttle body, wherein the fluid outlet is open at a position away from the body main body. 3. The annular member has a passage member projecting radially outward and forming the fluid passage with the cover member.
The throttle body according to claim 2, wherein the seal member seals between the passage member and the cover member. 4. The cover member has a passage member protruding toward the annular member and forming the fluid passage with the annular member, and the seal member seals between the annular member and the passage member. The throttle device according to claim 2, wherein the throttle device is provided. 5. The throttle body according to claim 1, further comprising: a valve member having an outer periphery surrounded by the annular member and rotating to adjust an intake flow rate flowing through the intake passage. A throttle shaft rotatably supported by the throttle body and rotating with the valve member.