JPS6238874A - Throttle body for fuel injector - Google Patents

Abstract

PURPOSE:To reduce the dimension of the captioned apparatus by arranging a main injection valve and an auxiliary injection valve at the diagonal positions so that the fuel injection directions of the both valves cross aslantly towards the downstream side of an intake passage. CONSTITUTION:An injection passage 11 opened aslantly towards an intake passage 2 on a little downstream side of an air valve 4 in the nearly perfect closed state is formed on a part of a body 1, and an injection valve 9 is installed into the injection passage 11. An auxiliary injection passage 3 is opened at the diagonal position for the injection passage 11 and at the position a little downstream from the injection passage 11, and an auxiliary injection valve 12 is installed in the auxiliary passage 13. Further, each edge of a bypass passage 14 is opened onto the wall surface of the intake passage 2 on the upstream and downstream sides of a throttle valve 6, and the bypass air in fast idling can be supplied into the downstream side of the throttle valve 6. Further, the fuel injection directions A and B of the main injection valve 9 and the auxiliary injection valve 12 form an angle of about 90 deg., and cross each other in the vicinity of the throttle valve 6.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a throttle body for a fuel injection device used in an internal combustion engine, and particularly to a so-called single point injection system in which a fuel injection valve is provided in the body. This article relates to a so-called throttle control gear for fuel control devices.

<Prior Art> According to the above-mentioned so-called single-point type fuel injection device, the throttle pogie for the so-called single-point type fuel injection device has fewer components, and moreover, the amount of fuel in the intake path is smaller than that of the so-called multi-point type fuel injection device. Since vaporization can be expected, there are advantages such as an inexpensive system. In such a single point injection system, it is necessary to equalize the distribution of the mixture to each cylinder.
According to the curved prior art, the injection valve is supported at the center of the intake passage upstream of the throttle valve, and the fuel injection direction of the injection valve is aligned with the central axis direction of the intake passage. I was doing it.

<Problems to be solved by the invention> However, in such a small throttle setting,
Since the injection valve reduces the effective cross-sectional area of the intake tract, there is an inconvenience that the ventilation resistance increases and the performance of the engine is impaired.To avoid this, the inner diameter of the intake tract must be reduced. There is an inconvenience that it has to be awkward and the body becomes large.

In view of the shortcomings of the conventional technology, the main purpose of the present invention is to develop a single point injection type fuel:
In the 1st injection device, the fuel injection unit has been downsized by reducing the ventilation resistance of the 1st cylinder body as much as possible.
To provide a throttle body for one device.

<Comprehensive Means for Solving the Problems> According to the present invention, such an object is achieved by providing a main injection valve and an auxiliary injection valve for injecting and supplying fuel into an intake passage installed in a body main body, and the above-mentioned In a throttle valve for a fuel injection Q4 device having a throttle valve provided in the intake passage on the downstream side of both injection valves, the fuel injection direction of both the injection valves is set in the intake passage. This is achieved by providing a slot for a fuel injection device which is characterized in that it is provided at diagonal positions so as to cross obliquely toward the downstream side of the road.

In particular, if the main injection valve and the auxiliary injection valve are arranged so that their fuel injection q4 directions form an angle of about 90 degrees with respect to each other, there will be interference.

<Operation> According to the above-described configuration, the injection valve does not protrude into the intake tract, so that the ventilation resistance of the slot body can be minimized. In addition, in order to appropriately atomize the fuel, it is preferable to inject the fuel toward the stubble valve, so the distance between the fuel 1.81 injection direction of the injection valve and the axial direction of the intake passage If the angle is made smaller, the space required for the injector will increase accordingly, but the injector and auxiliary injector are installed diagonally, and the fuel 1' of both injectors is ul blowing direction is about 9 to each other
If they are covered so as to form an angle of 0 degrees, it is possible to atomize the fuel appropriately without increasing the size of the throttle valve.

Embodiments The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

FIG. 1 shows a fuel injection system according to the present invention.
This figure shows a main body 1 in which an intake passage 2 is formed in the vertical direction.

■On the upstream side of the intake passageway that communicates with the air cleaner (1! shown in the figure), an air valve 4 is supported by the valve shaft 3 at an A-offset position, and is connected to the intake manifold (1! shown in the figure). On the downstream side of the intake passage, a throttle valve 6 is installed.
It is supported by a valve shaft 5.

The valve stems 5 of the valves 1 to 6 are made in a known manner.
The valve is driven to open by a lead wire (not shown).

A part of the main body 1 is provided with an injection passage 11 that opens obliquely toward the intake passage 2 on the slightly downstream side of the air valve 4 which is in a substantially closed state, and an injection valve 9 is provided within the injection passage. It is being The injection valve 9 is provided with a pressure control valve 10 for adjusting injection pressure. An auxiliary injection passage 13 is opened at a diagonal position opposite to the injection passage 11, and at a position downstream of the injection passage, and an auxiliary injection valve 12 is opened therein. Or is provided. In addition, Cj and a notch 4a are provided in a portion of the air valve 4 that is adjacent to the 1q side of the injection passage 11.
is cut out to avoid interference between the air valve 4 and the injection valve 9.

Eight ends of the bypass passage 14 are connected to the walls of the intake passage 2 on the upstream and downstream sides of the throttle valve 6, respectively, so that bypass air during fast idle can be supplied to the downstream side of the throttle valve 6. That's what I do.

Fuel injection θ of the main injection valve 9 and the auxiliary injection valve 12 [1 direction A,
B make an angle of about 90 degrees with respect to each other and intersect in the vicinity of the torque valve 6.

Next, the basics of the operation of this embodiment will be explained.

During normal operation of the engine, fuel is supplied only by the injection valve 9, so that an air-fuel mixture with a desired air-fuel ratio is formed. In cold weather or when accelerating at Lt, the auxiliary injection valve 12
J6 will be injected with fuel *31, but both stations I=
Since the fuel injection direction of the J valve intersects approximately at one angle, the transition between starting and stopping the operation of the auxiliary injection valve 12 is performed smoothly.
It is possible to avoid sudden changes in the engine's characteristics and the sudden change in engine speed.
11. The fuel being sent from both valves q and 1 is interfering with the valve 41 and the valve 61-1': ! i hit,
Alternatively, nine people per country will be installed in the intake passage on the downstream side of the throttle valve 6, and the air-fuel mixture in the (-1 cross section) of the intake passage on the downstream side of the throttle valve 6 will be This means that the distribution of air pressure to each cylinder is evenly distributed.

<First result of the invention> According to the present invention, the fuel port/valve 1 protrudes into the intake vent, and the ventilation resistance of the body is reduced. Therefore, it is possible to downsize the screen, and only -b-Ll! Q・Before and after the start of the fl operation of the 1 valve (when the fuel oil is supplied): 1 supply special・I) The transition of I goes to the uniformity and its effect (ma)
~I'm a happy person.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the main body of the present invention. 1...Small di main body 2...Intake path 3...Valve stem 4...Air valve 71a...Notch part
5...Valve shaft 6...S[]Tsuru1~Ruruvalve9...
Injection valve 10...pressure control valve 11...injection passage 1
2... Auxiliary injection valve 13... Auxiliary injection passage 14.
・Bypass passage

Claims (2)

[Claims] (1) For a fuel injection device having a main injection valve and an auxiliary injection valve that inject and supply fuel into an intake path installed in the body, and a throttle valve installed in the intake path downstream of both the injection valves. In the throttle body, the fuel injection device is characterized in that the two injection valves are provided at diagonal positions with respect to each other so that their fuel injection directions diagonally intersect toward the downstream side of the intake passage. throttle body. (2) The throttle body for a fuel injection device according to claim 1, wherein the fuel injection directions of the two injection valves intersect with each other at an angle of approximately 90 degrees.