JPS62279238A - Intake gas throttling device for gasoline engine - Google Patents

Abstract

PURPOSE:To improve the accuracy of a throttle valve interlocking mechanism and to make uniform the mixture gas distribution by engaging an intermediate lever slidable on an intermediate shaft installed perpendicularly against two throttle valve shafts with a roller arranged on a lever integrated with respective throttle valve shafts. CONSTITUTION:Intake throttle valves 4, 5 are provided in two intake tubes 2, 3. An integrally rotatable main lever 10 is mounted on a main throttle valve shaft 8 while a main roller 11 is fixed rotatably and in parallel with the valve shaft 8 at the tip of said lever 10. Similarly, a driven roller 13 is provided for a driven lever 12 of a driven throttle valve shaft 9. Furthermore, an interme diate shaft 14 is provided between said valve shafts 8, 9 perpendicularly against a line connecting between said valve shafts then a linear motion bearing 16 is mounted thereon so as to secure an intermediate lever 19. Then the main roller 11 and the driven roller 13 are contacted against the rolling faces 17, 18 of the intermediate lever 19. Consequently, the throttle valves rotatable in the opposite directions can be interlocked accurately.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an intake throttle device for a multi-cylinder gasoline engine, and particularly relates to an intake throttle device for a multi-cylinder gasoline engine, which is attached to two throttle valve shafts and opens in opposite directions. This invention relates to a throttle valve interlocking mechanism.

[Conventional technology]

The conventional device for mechanically interlocking multiple throttle valves was developed in the 1970s.
There is a method of attaching the throttle valve to one shaft as disclosed in Japanese Patent Publication No. 3-47, and a method of rotating two throttle valve shafts in opposite directions with a pin as disclosed in JP-A-55-131564. Are known. However, the method of attaching multiple throttle valves to one throttle valve shaft is disclosed in Japanese Patent Application Laid-open No. 55-131.5.
As stated in Japanese Patent No. 64, there is a problem that the mixture distribution between each cylinder tends to be uneven. On the other hand, in Japanese Patent Application Laid-open No. 55-431564, two throttle valve shafts are moved in opposite directions with a pin. However, the details of the linkage device are not disclosed.

[Problem that the invention seeks to solve]

When the throttle valves installed on the two throttle valve shafts are rotated in opposite directions, the slight difference in rotation angle between the two throttle valves will cause the passage around both throttle valves to occur, especially where the throttle valve opening is small. This causes a difference in the amount of air between the fuel and the air, resulting in non-uniformity in the distribution of the air-fuel mixture that cannot be ignored. In the above-mentioned Japanese Patent Application Laid-Open No. 55-131564, the interlocking mechanism of the two throttle valves is not specified, and it is probably a method using pins and cams. 60°
Anything above that would be quite unreasonable. On the other hand, in recent years, there has been a trend toward increasing the diameter of the throttle valve in order to obtain high output. Therefore, in order to perform delicate output control at low speeds, throttle valves that can reduce the change in air volume due to changes in the throttle valve angle at low speeds have been developed. It is now necessary to use a portion with a small inclination angle. Therefore, the rotation angle of the throttle valve is 80'' or more, which is a problem that cannot be solved by the above-mentioned conventional technology.

An object of the present invention is to accurately interlock two throttle valve shafts that rotate in opposite directions within a range where the rotation angle of the throttle valve is 80 degrees or more, thereby solving the above-mentioned problem of uneven distribution of air-fuel mixture. There it is.

Means for Solving the Problem] The above object is achieved by accurately interlocking two throttle valve shafts rotating in opposite directions.

The present invention has a main lever that rotates integrally with the main throttle valve shaft, a main roller that is attached to the tip of the main lever and has a rotating shaft parallel to the main throttle valve shaft, and a straight line connecting the main throttle valve shaft and the driven throttle valve shaft. an intermediate shaft provided perpendicularly to the intermediate shaft, a linear motion bearing sliding on the intermediate shaft, a main roller fixed to the linear motion bearing and having a rotation axis parallel to the main roller perpendicular to the intermediate shaft and the slave throttle valve shaft. An interlocking device consisting of an intermediate lever having a roller shifting surface and a driven lever that rotates together with the driven throttle valve shaft and has a driven roller at its tip is used to accurately match the rotation angles of both throttle valves.

(Operation) In other words, when the main throttle valve shaft rotates, the main roller rolls on the rolling surface on the intermediate lever, causing the linear motion bearing to move linearly along the intermediate shaft.Furthermore, another rolling surface on the intermediate lever is rotated on the rolling surface on the intermediate lever. and the slave lever, rotates the driven throttle valve shaft.The main roller and the slave roller are constantly pressed against the transfer surface by the main spring and slave spring, which also serve as return springs for each throttle valve.In a single interlocking device, the linear motion bearing and the intermediate It is possible to completely match the rotation angles of both throttle valves by reducing the backlash of the shaft and ensuring that the transfer plane of the intermediate lever is parallel to the straight line connecting the main throttle valve shaft and the slave throttle valve shaft.
This can be achieved relatively easily by using commercially available linear motion bearings.

〔Example〕

Six embodiments of the present invention will be described below with reference to FIG. 1, which are examples in which the present invention is applied to a fuel injection device.

Two intakes @2 and 3 are provided in the fuel injection device 1,
Intake throttle valves 4 and 5 are provided in each intake cylinder to control the intake air amount of the engine. Intake! The upstream side of the 2.3 is open to the atmosphere via an air cleaner 6, and the downstream side is connected to each cylinder of a multi-cylinder gasoline engine (not shown) via an intake manifold 7.

The intake throttle valve 4 passes through the intake cylinder 2 and is fixed to a main throttle valve shaft 8 rotatably provided. The intake throttle valve 5 is connected to the intake cylinder 3
The driven throttle valve shaft 9 is fixed to the driven throttle valve shaft 9 which is rotatably provided through the shaft.

A main lever 10 that rotates integrally with the main throttle valve shaft 8 is attached, and a main roller 11 is rotatably attached to the tip of the main lever parallel to the main throttle valve shaft 8.

Similarly, the driven throttle valve shaft 9 has a driven lever 12. Follower roller 1
3, and the distance between the main throttle valve @8 and the main roller 11 and the distance between the driven throttle valve @9 and the driven roller 12 are set to be exactly the same.

An intermediate shaft 14 is provided between the main throttle valve shaft 8 and the driven throttle valve shaft 9, perpendicular to a straight line connecting both throttle valve shafts.

Both ends of the intermediate shaft 14 are press-fitted into a support 15 provided to protrude from the fuel injection device 1. Intermediate shaft 1
A linear motion bearing 16 is mounted on 4 so as to be slidable in the axial direction. The linear motion bearing 16 is a commercially available bearing containing steel balls, and the backlash with the intermediate shaft 14 is maintained at about 10 microns.

Direct, t! i! The motion bearing 16 has a main roller 11. An intermediate lever 19 is fixed, in which the follower roller 13 is in permanent contact and has a shifting surface 17,18 parallel to the straight line connecting the main throttle valve shaft 8 and the follower throttle valve shaft 9. The main roller 11 and the follower roller 13 are brought into contact with the transfer surfaces 17 and 18 by means of a main spring 20 and a follower spring 21, which also serve as throttle valve return springs, respectively.

A throttle lever 22 is provided on the opposite side of the main lever 10 from the main roller 11, and is operated by the driver via an accelerator wire 23 in the case of an automobile.

Upstream of the intake throttle valves 4 and 5 in the intake cylinders 2 and 3, there is a fuel injection valve 24 that injects fuel according to the intake air amount of the engine.
25 are provided.

When the throttle lever 22 is pulled via the accelerator wire 23, the main throttle valve shaft rotates counterclockwise in the figure, and at the same time, the intake throttle valve 4 rotates. At the same time, the main roller 11 passes through the rolling surface 17 to the intermediate lever 19, the linear motion bearing 16. Push down the transfer surface 18. The rolling surface 18 is connected via the follower roller 13 to the follower lever 12 . Driven throttle valve shaft9. Rotate the intake throttle valve 5 clockwise.

In this interlocking device, the distance between the main throttle valve shaft 8 and the main roller 11, the distance between the driven throttle valve shaft 9 and the driven roller 13, the perpendicularity between the linear motion bearing 16 and the rolling surfaces 17 and 18, the rolling surface 17. 1
The distance 8 is fixed and accurate dimensions can be maintained, and the relationship between the intermediate shaft 14 and the rain throttle valve shafts 8 and 9 only fluctuates by about 10 microns due to radial play of the throttle valve. Also, the play between the intermediate shaft 14 and the straight 11A motion bearing 16 can be suppressed to about 10 microns by using a heavy plate linear motion bearing. Also, both throttle valve shafts 8,
Movement of each member in the nine directions has no effect on the accuracy of the interlocking.

Therefore, according to the configuration of this embodiment, it is possible to interlock the main and driven throttle valve shafts 8, 9 at exactly the same angle and up to 90'' or more.

〔Effect of the invention〕

Therefore, according to the present invention, with a relatively simple interlocking mechanism, two
Since it is possible to accurately interlock the throttle valves that rotate in two opposite directions, it has the effect of preventing uneven distribution of air-fuel mixture to each cylinder of a multi-cylinder gasoline engine caused by the throttle valves.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Fuel injection device, 2... Intake cylinder, 3... Intake cylinder, 4... Intake throttle valve, 5... Intake throttle valve, 7...
- Intake manifold, 8... Main throttle valve shaft, 9... Followed throttle valve shaft, 11... Main roller, 13... Follow roller, 14
...Intermediate shaft, 16...Direct tea l mouth 112. Main roller/? Middle IJI review

Claims (1)

[Claims] 1. In an intake throttle device for a gasoline engine that has two throttle valve shafts, a main throttle valve shaft and a driven throttle valve shaft, which rotate in opposite directions, one or more intake throttle valves are fixed, and the main throttle valve shaft and the driven throttle valve shaft rotate in opposite directions. A main lever and a slave lever are provided that rotate together with the valve shaft and the driven throttle valve shaft, and have main and slave rollers installed parallel to each shaft at their tips, and a straight line connecting the main throttle valve shaft and the driven throttle valve shaft. an intermediate shaft installed perpendicular to the intermediate shaft, a linear motion bearing sliding on the intermediate shaft, and an intermediate lever fixed to the linear motion bearing and having rolling surfaces of a main roller and a follower roller perpendicular to the intermediate shaft. An intake throttle device for a gasoline engine, characterized in that both throttle valve shafts are mechanically interlocked in the order of a main lever, a main roller, an intermediate lever, a follower roller, and a main lever.