JPH031492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a throttle valve opening/closing device for controlling the intake flow rate to an engine.

In this type of throttle valve opening/closing device, a throttle lever is connected to a valve shaft of a throttle valve provided in a throttle body, and the throttle valve is opened by rotating the throttle lever. Further, a tension spring as a return spring is spanned between the throttle lever and the throttle body, and the throttle valve is closed by the restoring force of the tension spring.

In recent years, as engines have become faster, the vibration conditions transmitted from the engine to the throttle valve opening/closing device have become increasingly complex and severe. Therefore, the tension spring serving as the return spring may resonate due to engine vibration, and this resonance may cause the tension spring to break.

For this reason, we have developed a system that uses two tension springs, and even if one tension spring breaks, the remaining tension spring can be used to close the throttle valve, increasing safety. be. However, since the resonance point of the tension spring is originally close to the operating vibration range of the engine, even if two tension springs are used, the reliability is poor.

For this reason, recently, a torsion spring has been developed that uses a torsion spring whose resonance point is sufficiently far away from the vibration range in which the engine is used. That is, this throttle valve is constructed by arranging an inner sleeve and an outer sleeve around the valve shaft of the throttle valve, and winding a torsion spring as a return spring around the outer periphery of each sleeve.

However, in the case of using each of the above-mentioned torsion springs, when these torsion springs are rotated with the rotation of the throttle lever, these torsion springs come into sliding contact with the outer peripheral surfaces of the above-mentioned inner and outer sleeves, This causes a problem in that each of the torsion springs described above is worn out. Therefore, after long-term use, the return force of the torsion spring is significantly reduced, which poses a problem in the durability of the device.

For this reason, in Japanese Utility Model Application Publication No. 53-8427, each of the inner sleeve and outer sleeve disposed inside the inner torsion spring and the outer torsion spring, respectively, is divided in the axial direction,
One of the divided inner and outer sleeves is fixed to the throttle body side, and the other divided inner and outer sleeves are fixed to the inner torsion spring and the outer torsion spring, respectively. A device has been proposed that rotates integrally with an outer torsion spring.

According to this, since the other inner sleeve and outer sleeve, which are divided in the axial direction, rotate integrally with the inner torsion spring and the outer torsion spring, respectively, there is no possibility of wear occurring between these springs and the divided sleeve. This has the advantage of preventing

However, in such a structure, one of the inner and outer sleeves that are divided in the axial direction is still fixed to the throttle body, so relative rotation occurs between the fixed sleeve and the torsion spring. This causes wear and tear.

Furthermore, in the case of the structure disclosed in the above-mentioned publication, the sleeve is divided into four pieces in total, which increases the number of parts, requires time and effort to assemble, and increases costs.

The present invention was made based on the above circumstances, and its purpose is to reliably prevent wear and improve durability, and also to simplify assembly due to fewer parts, thereby reducing costs. The present invention aims to provide a throttle valve opening/closing device for an internal combustion engine that can realize low cost.

In order to achieve the above object, the present invention has a structure in which the inner sleeve and the outer sleeve are each divided in the axial direction, and divided sleeve members each having an integral inner cylinder part and an outer cylinder part are opposed to each other in the axial direction, A feature of the present invention is that both of these divided sleeve members are attached to the valve shaft so as to rotate together with the valve shaft.

According to such a configuration, the inner sleeve and the outer sleeve rotate integrally with the valve shaft as the throttle lever rotates, so that they rotate integrally with each torsion spring. No wear occurs between the sleeve and each torsion spring. Moreover, since the inner sleeve and the outer sleeve are each divided in the axial direction, and are configured by axially opposing split sleeve members each having an integral inner cylinder part and an outer cylinder part, the number of parts is reduced. Easy to assemble.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, reference numeral 1 denotes a throttle body, and this throttle body 1 is formed with a valve hole 2 that communicates with an intake passage. This valve hole 2 is opened and closed by a valve body 4 of a throttle valve 3, and 5 is a valve shaft thereof. A throttle lever 6 is integrally connected to one end of the valve shaft 5.
This throttle lever 6 is adapted to be rotated in the direction A in FIG. 2 in conjunction with an operator such as an accelerator pedal (not shown). Therefore, the valve body 4 is opened by rotating the valve shaft 5 through the throttle lever 6 using the operator.

On the other hand, a plate 7 is fixed to the other end of the valve shaft 5, and an inner sleeve 9 and An outer sleeve 10 is arranged. These inner sleeve 9 and outer sleeve 10 are each constructed by combining a pair of half bodies 11 and 12 that have a substantially double tube structure.
and one end side of the outer cylinder part 14 are integrally connected to each other by an end plate part 15. That is, the inner sleeve 9 is the inner cylinder part 1 of the half bodies 11 and 12.
3 and 13, and the outer sleeve 12 is composed of outer cylinder parts 14 and 14 of the half bodies 11 and 12.
It is composed of:

Further, protrusions 16, 16 are formed on the end plates 15, 15 of the half bodies 11, 12, respectively.
These projections 16, 16 are fitted into the throttle lever 6 and plate 7, respectively.
Therefore, the inner sleeve 9 and the outer sleeve 10, which are made up of the half bodies 11 and 12, are rotated integrally with the valve shaft 5 via the throttle lever 6 and plate 7.

Torsion springs 17 and 18 are wound around the outer peripheries of the inner and outer sleeves 9 and 10, respectively. These torsion springs 17, 18
One end thereof is fixed to the hook portion 6a of the throttle lever 6, and the other end thereof is fixed to the hook portion 1a of the throttle body 1. As shown in FIGS. 3 and 4, the outer sleeve 10 is provided with notches 19 and 20 for guiding both ends of the torsion spring 17 and preventing interference between the torsion spring 17 and the outer sleeve 10. is formed.

Next, the operation of one embodiment with the above configuration will be explained.

First, when an operator such as an accelerator pedal is operated, the throttle lever 6 is moved by the torsion spring 1.
7 and 18, and at the same time, the valve shaft 5 and the throttle lever 6 are rotated in the same direction, so that the throttle valve 3 is opened. Conversely, when the operator is returned to its original position, the throttle lever 6 is rotated in the opposite direction by the return force of the torsion springs 17 and 18, thereby closing the throttle valve 3. It is.

According to the above embodiment, as the throttle lever 6 rotates, the torsion springs 17, 1
8 will also be rotated, but at this time, since the inner and outer sleeves 9 and 10 are integrally connected to the valve shaft 5, these will also be rotated at the same time. Thus, the torsion springs 17, 18 and the inner and outer sleeves 9,
The sliding resistance with the torsion springs 17 and 10 is reduced, and wear of these torsion springs 17 and 18 can be reduced. As a result, the return sources of the torsion springs 17 and 18 can be maintained even during long-term use, and durability can be improved. Also,
Since the torsion springs 17, 18 and the inner and outer sleeves 9, 10 rotate together, the wear occurring on the torsion springs 17, 18 can be made uniform, and there is also the advantage that local wear can be prevented.

Furthermore, in this embodiment, a torsion spring 1 whose resonance point is far away from the vibration range of the engine is used.
7 and 18, it is possible to prevent the torsion springs 17 and 18 from breaking due to engine vibration.
Moreover, even if one torsion spring 17 should break, the throttle valve 3 can be reliably closed by the other torsion spring 18, which is an excellent safety measure.

Furthermore, since the inner sleeve 9 and the outer sleeve 10 are constructed in a divided structure consisting of the half bodies 11 and 12, it is not only easy to manufacture and assemble these parts, but also to reduce the cost. Can be done.

Note that the present invention is not limited to the above embodiment. For example, as shown in FIG. 5 and FIG.
By forming the step portions 21, 21 on the flanges of the torsion springs 17, 18, respectively, the lead-out portions of the torsion springs 17, 18 can be reliably separated. Therefore, even if these torsion springs 17 and 18 vibrate in the axial direction of the valve shaft 5, it is possible to prevent them from coming into contact with each other, and there is an advantage that wear and tear caused by this contact can also be prevented.

As explained above, according to the present invention, the inner sleeve and the outer sleeve rotate integrally with the valve shaft as the throttle lever rotates, so that they rotate integrally with each torsion spring. ,
No sliding resistance occurs between the inner sleeve and the outer sleeve and the inner torsion spring and the outer torsion spring, respectively, thereby preventing wear and improving durability. Moreover, since the inner sleeve and the outer sleeve are each divided in the axial direction and are constructed by axially opposing split sleeve members each having an integral inner cylinder part and an outer cylinder part, the number of parts is reduced. This has the advantage of being easy to assemble and reducing costs.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a view taken from the direction of the arrow in FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along the line - in FIG. 1, and FIGS. 5 and 6 show other embodiments of the present invention, and each is a perspective view of a half body. 1... Throttle body, 3... Throttle valve, 5... Valve stem, 6... Throttle lever, 9...
...Inner sleeve, 10...Outer sleeve, 17,
18...Torsion spring.

Claims (1)

[Claims] 1. A throttle body is provided with a throttle valve,
A throttle lever is connected to the valve shaft of the throttle valve, and an inner sleeve and an outer sleeve are respectively arranged around the valve shaft, and on the outer periphery of the inner sleeve and the outer sleeve, respectively.
In a throttle valve opening/closing device comprising an inner torsion spring and an outer torsion spring each having one end fixed to the throttle body side and the other end fixed to the throttle lever, the inner sleeve and the outer sleeve are arranged such that: Segmented sleeve members that are mutually divided in the axial direction and each integrally have an inner cylinder portion and an outer cylinder portion are configured to face each other in the axial direction, and both of these divided sleeve members rotate integrally with the valve shaft. A throttle valve opening/closing device for an internal combustion engine, characterized in that the throttle valve opening/closing device is connected to the valve shaft as shown in FIG.