JP2595913Y2 - Throttle body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle body made of resin, and more particularly, to a structure for preventing icing or the like caused by low thermal conductivity of resin.

[0002]

2. Description of the Related Art In general, in an engine employing a multi-point injection having an injector for each cylinder, the flow rate of air taken in through an air cleaner is controlled by a throttle valve in an intake passage of a throttle body. It is sucked into the engine from the manifold. Fuel is injected from an injector provided for each cylinder into the vicinity of an intake valve in an intake manifold. Conventionally, aluminum having high thermal conductivity has been used as the material of the throttle body.

[0003]

In recent years, resin has been attracting attention as a material for a throttle body that can satisfy the requirements for cost reduction and weight reduction. However, resin has a thermal conductivity of about 1 compared to metals such as aluminum.
When the throttle body is made of resin, heat is difficult to be transmitted around the throttle shaft and the throttle bore, and icing may occur.

That is, in an engine employing multipoint injection, fuel injected into the intake manifold does not cause icing, but is included in blow-by gas, EGR gas, etc., which is sucked into the engine together with fresh air. Icing may occur due to the adhering steam near the throttle valve where the flow velocity increases. When icing occurs, the opening / closing operation of the throttle valve may be restricted and may not be fully closed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a throttle body which can reduce the cost and weight and can surely prevent the occurrence of icing.

[0006]

The throttle body according to the present invention is formed of a synthetic resin material, and is provided with engine cooling water.
A main body in which a water channel through which air is introduced and an intake passage are formed;
A throttle valve that can be freely opened and closed in the air passage;
Made of a material with better thermal conductivity than the synthetic resin material,
Installed near the throttle valve on the inner surface of the intake passage
Material with better heat conductivity than synthetic resin material
Part of the material is engaged with the heat dissipating member and the other part is
Exposed to the engine cooling water in the water channel
A heat transfer body that conducts the heat of the cooling water to the heat dissipation member, and the main body and the heat transfer
Between the body and the waterway and the intake passage to maintain watertightness.
And a sealing material .

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
1 and 2 are views showing a throttle body according to a first embodiment of the present invention. In these figures, the flow rate of the air taken in through an air cleaner (not shown) is controlled by a throttle valve 12 in an intake passage 11 of a throttle body 10, and is sent from an intake manifold (not shown) to each cylinder (not shown) of the engine. Inhaled. The fuel is injected near the intake valve in the intake manifold by an injector (not shown) provided for each cylinder.

The throttle body 10 is made of a thermosetting resin,
It is formed of an engineering plastic such as a thermoplastic resin. A cover 19 is attached to the throttle body 10.
Between them, a water channel 13 is formed. Engine cooling water is introduced into the water channel 13. A groove 14 is provided in the inner surface of the intake passage 11 near the throttle valve 12 along the circumferential direction. The groove 14 has a substantially cylindrical metal insert 1.
5 are fitted.

A through hole 16 is provided between the groove 14 and the water channel 13 in the throttle body 10, and a heat transfer body 17 is inserted into the through hole 16. The heat transfer body 17 is formed of a material having a high thermal conductivity such as a metal. The distal end portion 17b of the heat transfer body 17 is press-fitted into the metal insert 15, and the heat absorbing surface 17a formed on the head of the heat transfer body 17 is exposed in the water channel 13 and is exposed to engine cooling water. An O-ring 18 is interposed as a sealing material between the inner surface of the through hole 16 of the throttle body 10 and the outer peripheral surface of the heat transfer body 17. The O-ring 18 is formed of an elastic body such as rubber and prevents leakage of engine cooling water from a boundary between the throttle body 10 and the heat transfer body 17.

Since the present embodiment has the above configuration, the heat of the engine cooling water introduced into the water passage 13 is absorbed by the heat transfer body 17 from the heat absorbing surface 17a exposed to the engine cooling water. Conduction is conducted from the tip 17b of the body 17 to the metal insert 15. The metal insert 15 is always kept at a predetermined temperature during engine operation, and
Warm the intake air near 2. As a result, icing in the vicinity of the throttle valve 12 in the intake passage 11 is reliably prevented.

FIG. 3 is a sectional view showing a throttle body 20 according to a second embodiment of the present invention. In this figure,
The heat transfer body 21 is formed integrally with the metal insert 15. Corner of the heat transfer body 21 on the side of the water channel 22 (upper and lower ends on the right side of the figure)
A groove 2 having a triangular cross-section
4 are formed. The O-ring 18 is fitted in the groove 24 and prevents leakage of engine cooling water from the boundary between the throttle body 20 and the heat transfer body 21.

As described above, according to each of the above embodiments, the metal insert 15 provided near the throttle valve 12 on the inner surface of the intake passage 11 is heated by the heat of the engine cooling water, and the intake air near the throttle valve 12 is discharged. Since the heating is performed, the water vapor contained in the blow-by gas, the EGR gas and the like in the intake air does not adhere around the throttle valve 12 and the throttle bore, and icing does not occur.

The through hole 16 of the throttle body 10
Since the O-ring 18 is interposed between the inner surface and the outer peripheral surface of the heat transfer body 17, the O-ring 18 is caused by a difference in thermal expansion coefficient between the throttle body 10 and the heat transfer body 17, that is, a difference in thermal expansion coefficient between resin and metal. As a result, even when a gap or the like occurs at the boundary between the throttle body 10 and the conductor 17, the watertightness of the water channel 13 is maintained.

[0014]

As described above, according to the present invention, the cost and the weight can be reduced, and the occurrence of icing can be reliably prevented.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the throttle body of FIG. 1 taken along the line AA.

FIG. 3 is a sectional view showing a throttle body according to a second embodiment of the present invention.

[Explanation of symbols]

10, 20 Throttle body 11 Intake passage 12 Throttle valve 13 Water passage 17, 21 Heat transfer member 17a Heat absorption surface ( other part ) 17b Tip part ( part ) 18 O-ring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02M 29/00-31/18 F01P 3/20 F02D 9/02

Claims (2)

(57) [Scope of request for utility model registration] 1. An engine cooling device made of a synthetic resin material.
The main body in which the water passage into which the reject water is introduced and the intake passage are formed
And a throttle valve provided in the intake passage so as to be openable and closable.
And a material having better thermal conductivity than the synthetic resin material
The throttle valve on the inner surface of the intake passage.
Formed of a heat dissipating member provided in the vicinity of the heat sink and a material having better thermal conductivity than the synthetic resin material.
One part is engaged with the heat radiation member, and the other part is the water.
Exposed to the engine cooling water in the road,
A heat transfer body that conducts heat of water to the heat radiating member ; and a heat transfer body provided between the main body and the heat transfer body;
A throttle body comprising: a sealing member for maintaining water tightness between the intake passage and the intake passage . 2. The heat dissipating member and the heat transfer body are integrally formed.
The throttle body according to claim 1 , wherein the throttle body is formed in a throttle body.