JPH01315628A - Throttle valve device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve device for automobiles, and in particular to a throttle valve device equipped with a wax type fast idle am suitable for simplifying hot water passages and reducing costs. Regarding.

[Conventional technology]

A conventional throttle valve device, as described in Japanese Utility Model Publication No. 62-21716, consists of a throttle valve body having a throttle valve, a separate upstream member having a fuel injection valve, and wax constituting a temperature-sensitive actuating device. It has a wax holder for storing the throttle valve, and a wax type fast idle R structure that changes the opening degree of the throttle valve by temperature-sensitive operation of the wax, and the temperature-sensitive operation device is screwed to a separate member on the upstream side of the throttle valve body. The wax boulder, a separate member on the upstream side, and a hot water passage passing through the throttle valve body heated the wax and prevented the throttle valve from icing.

Another conventional throttle valve device is disclosed in Japanese Patent Application Laid-Open No. 58-107828.
As described in the issue, the wax-type fast idler has a throttle valve body with a throttle valve, wax that constitutes a temperature-sensitive actuation device, and a wax holder that stores the wax, and changes the throttle valve opening degree by the temperature-sensitive actuation of the wax. The temperature-sensitive actuator was screwed onto the throttle valve body.

[Problems to be Solved by the Invention] However, the throttle valve device described in Utility Model Publication No. 62-21716 does not take into account the simplification of the hot water passage, and in order to prevent icing of the throttle valve, a temperature-sensitive There is a problem in that a long hot water passage is required from the upstream separate member to which the actuating device is attached to the throttle valve body.

Furthermore, the throttle valve device described in Japanese Patent Application Laid-Open No. 58-107828 is
Since the temperature-sensitive actuating device and the throttle valve body are separate members, there is a problem in that the heat of the temperature-sensitive actuating device is not sufficiently transmitted to the throttle valve body, and the effect of preventing icing on the throttle valve cannot be achieved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a throttle valve device that can simplify the hot water passage, reduce manufacturing costs, and also achieve the effect of preventing icing.

[Means to solve the problem]

The above purpose is to provide a wax-type fast idle mechanism that has a throttle valve body having a throttle valve, wax that constitutes a temperature-sensitive actuating device, and a wax holder that stores the wax, and that changes the opening degree of the throttle valve by the temperature-sensitive actuation of the wax. In the throttle valve device, the throttle valve body and the wax holder are integrally formed by casting, and at least the wax holder portion of the casting is
This is achieved by a throttle valve device characterized by forming a hot water passage that serves both to heat the wax and prevent icing on the throttle valve. Here, the hot water passage is preferably provided in both the wax holder portion and the throttle valve body portion of the casting.

The above object also includes a throttle body having a throttle valve, a separate upstream member having at least one of a fuel injection valve and a hot-year air flow meter, and a wax holder for storing wax and wax constituting a temperature-sensitive actuation device. In a throttle valve device having a wax-type fast idle mechanism that changes the opening degree of the throttle valve by temperature-sensitive operation of the wax, the throttle valve body and the wax holder are integrally formed of a single piece, and at least the wax holder portion of the casting is This is achieved by a throttle valve device characterized by forming a hot water passage that serves both to heat the wax and prevent icing on the throttle valve. Preferably, a cam that transmits the temperature-sensitive operation of the wax to the throttle valve is provided on a separate upstream member, and an insulator for heat insulation is provided between the throttle valve body and the separate upstream member.

[Effect]

In the present invention configured as described above, the throttle valve body and the wax holder are integrally formed by casting, so that heating of the wax immediately heats the throttle valve body, and the hot water passage in the wax holder prevents the throttle valve from icing. It also functions as a utility. If the hot water passage is also provided in the throttle valve body, the effect of preventing throttle valve icing can be more reliably achieved. Furthermore, the hot water passage can be simplified as a single short hot water passage passing through the wax holder or between the wax holder and the throttle valve body.

Further, in a throttle valve device including a separate member on the upstream side, the hot water passage serving as a heat source is concentrated only on the throttle valve body side, so that heat damage to the separate member on the upstream side can be minimized.

If the cam that transmits the temperature-sensitive operation of the wax to the throttle valve is installed in a separate member on the upstream side, the wax type first idler
The component parts are separated into the throttle valve main body side and the upstream separate member side, and the structure can be simplified. Further, when an insulator for heat insulation is provided between the throttle valve body and the upstream side separate member, heat damage to the upstream side separate member can be further reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 and 2, the throttle valve device of this embodiment has a throttle body 2 that rotatably supports a throttle shaft 1, and a throttle valve 3 is connected to the throttle shaft 1. There is.

Further, a roller lever 5 having a roller 4 at its tip is connected to the throttle valve shaft 1 in a unilateral elastic manner. The throttle valve main body 2 is integrally formed with a wax holder 6 by casting, and a wax 7, which is a temperature-sensitive operating body, is housed and supported in the wax holder 6, and a wax lever 8 is attached to the wax 7. The wax holder 6, the wax 7, and the wax lever 8 constitute a temperature-sensitive actuating device for a wax type fast idle am. At the intake upstream portion of the throttle valve device, a separate upstream member 10 is coupled onto the throttle valve main body 2 via an insulator 9 that is a heat insulator. The upstream separate member 10 is provided with an injector 11 for producing fuel f4@mist, and a fuel passage 12 to the injector 11. Further, a camshaft 14 equipped with a cam 13 that engages with the roller 5 of the wax type fast idler 111tm is attached to the separate upstream member 10, and the wax lever 8 engages with this camshaft 14, and the throttle valve 3 The opening degree is regulated.

The wax holder 7 and the throttle valve body 2 are integrally formed by casting.
As shown in FIG. 3, a hot water passage 16 to which a hot water nipple 15 is connected is formed in the wax holder portion of the wax holder.
There is also a hot water passage 1 connected to this hot water passage 16 in the throttle valve body.
7 is formed.

A hot water outlet 18 is provided in the hot water passage 17.

In this embodiment configured in this way, the hot water supplied from the hot water nipple 15 passes through the hot water passage 16 in the wax holder 7, the hot water passage 17 in the throttle valve body 2, and is discharged from the hot water outlet 18. be done. At this time, the wax holder 6 is warmed by the hot water passing through the hot water passage 16 inside the wax holder 6, and the wax 7 is activated by temperature sensing, causing the wax lever 8 to move up and down.
The rotation is converted into four rotations, and the cam 13 also rotates.

The rotation of the cam 13 causes the roller 5 engaged with the cam 13 to swing, and the roller lever 4 coupled to the roller 5 to swing as well. This movement is linked to changes in the opening degree of the throttle valve 3 via the throttle valve shaft 1.

Furthermore, since the wax holder 6 and the throttle valve body 2 are integrally cast, the heat of the warmed wax holder 6 is transmitted to the throttle valve body 2, thereby warming the throttle valve body 2. The throttle valve main body 2 is also warmed by hot water passing through its own hot water passage 17. This achieves the effect of preventing the throttle valve 3 from icing.

In this way, the hot water passage 16 provided in the wax holder 6
The hot water passage 17 provided in the throttle valve main body 2 made of a part of the cast material not only heats the wax 7 but also effectively prevents the throttle valve 3 from icing.

In addition, since hot water conduit n16.17 only has one continuous passage provided in the casting, the passage configuration can be simplified and the cost can be significantly reduced.

Further, since there is no hot water passage in the upstream separate member 10 and the throttle valve body 2 and the upstream separate member 10 are connected via the insulator 9, heat damage to the upstream separate member 10 can be minimized. Fuel connoisseur II? Fuel vapor phenomenon at r12 can be prevented.

4 and 5 show a second embodiment of the present invention. This embodiment is an example in which a hot wire type air flow meter is attached to a separate member on the upstream side instead of a fuel injection valve.

That is, the throttle valve main body 21 having the throttle valve 20 and the wax holder 23 to which the wax 22 is mounted are integrally formed by casting, and this casting has a hot water nipple 24 at the inlet, similar to the hot water passages 16 and 17 of the above-described embodiment. A hot water passage 25 is formed from the wax holder 23 to the throttle valve body 21, which serves to heat the wax 22 and prevent the throttle valve 20 from icing. A separate upstream member 26 is attached to the upstream side of the throttle valve body 21 via a heat insulating material 27, and a hot wire air flow meter 28 for detecting the air flow rate is attached to the separate upstream member 26.

The hot wire 29 of the air flow meter 28 is located in a bypass 31 of the main air passage 30.

Note that the hot wire 29 of the air flow meter 28 may be provided directly in the main air passage 30. A cam 32 that transmits the movement of the wax 22 to the throttle valve 20 is also attached to the upstream separate member 26.

In this embodiment, as in the first embodiment, the wax 22 is heated and the throttle valve 20 is
The icing prevention effect may not be achieved. Furthermore, since the upstream side separate member 26 is not provided with a hot water passage and a heat insulating material 27 is arranged between the throttle valve body 21 and the upstream side separate member 26, the air flow meter 28 due to the temperature rise of the upstream side separate member 26 This can prevent changes in characteristics and malfunctions.

FIG. 6 shows a conventional device structure for comparison. The wax holder 40 is attached to a separate upstream member 41 with a screw 4.
2, and a hot water hose 44 is used to guide hot water to the throttle valve body 43. A hot wire air flow meter 45 is also attached to a separate member 41 on the upstream side.
Therefore, the wax holder 40 and the separate upstream member 41 are fixed to the screw 42 via a heat insulating material.

For convenience, members equivalent to those shown in FIG. 1 are given the same reference numerals.

As can be seen from this comparison with the conventional device, the conventional device requires a rubber hose 44 to guide hot water from the wax holder 40 to the throttle valve body 43, and a mounting screw or In this embodiment, the wax holder 6.
23 is formed integrally with the throttle valve body 2.21 by casting, and only one hot water passage 16, 17.25 is provided therein, so the configuration is extremely simplified.

〔Effect of the invention〕

According to the present invention, since the hot water passage is provided in an integrated product, the hot water passage can be simplified, manufacturing costs can be reduced, and wax heating and icing prevention effects can be achieved. Furthermore, in a throttle valve device including a separate member on the upstream side, heat damage to the separate member on the upstream side can be minimized, and fuel vapor phenomenon and malfunction of the hot wire type air flow meter can be prevented. If a cam that transmits the temperature-sensitive operation of the wax to the throttle valve is provided as a separate member on the upstream side, the structure of the wax type fast idle machine can be simplified. Additionally, if an insulator is provided between the throttle valve body and another member on the upstream side,
Heat damage to other members on the upstream side can be further reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view of a throttle valve device according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the throttle valve device, and FIG. 3 is a cross-sectional view showing the hot water passage configuration of the throttle valve device. It is a front view, and the fourth
The figures are side views of a throttle valve device according to another embodiment of the present invention, FIG. 5 is a longitudinal sectional view of the throttle valve device, and FIG. 6 is a side view of a conventional throttle valve device. Explanation of symbols 2.21... Throttle valve body 6.22... Wax 7
．． 23... Wax holder 9.27... Insulator 10.26... Separate upstream member 11... Fuel injection valve 13.32... Cam 16
．． 17; 25...Hot water passage 28...Hot wire air flow meter Fig. 1 28--Hot wire air flow meter Fig. 2 Fig. 4

Claims (4)

[Claims] (1) It has a throttle valve body with a throttle valve, a wax holder that stores the wax and wax that constitutes a temperature-sensitive actuation device, and a wax-type fast idle mechanism that changes the opening degree of the throttle valve by the temperature-sensitive operation of the wax. A throttle valve device, characterized in that the throttle valve body and the wax holder are integrally formed of a cast metal, and a hot water passage is formed in at least the wax holder portion of the cast metal for heating the wax and preventing icing of the throttle valve. (2) The throttle valve device according to claim 1, wherein the hot water passage is provided in both the wax holder portion and the throttle valve body portion of the casting. (3) A throttle valve body having a throttle valve, a separate upstream member having at least one of a fuel injection valve and a hot-year air flow meter, and a wax holder for storing wax and wax constituting a temperature-sensitive actuating device; In a throttle valve device that has a wax type fast idle mechanism that changes the opening degree of the throttle valve by temperature-sensing operation, the throttle valve body and wax holder are integrally formed by casting, and at least the wax holder part of the casting is equipped with wax heating and throttle valve. A throttle valve device characterized by forming a hot water passage that also serves to prevent valve icing. (4) A cam for transmitting the temperature-sensitive operation of the wax to the throttle valve is provided in a separate member on the upstream side, and an insulator for heat insulation is provided between the throttle valve body and the separate member on the upstream side. Throttle valve device.