JPS63212730A - Intake throttle valve return device of engine - Google Patents

Abstract

PURPOSE:To simplify the manufacture of the titled device and to improve the strength of a valve stem by providing a spring holder, which is engaged with the terminal portion of a valve stem at the bottom portion thereof and fixed thereto and has a gap left between the other end thereof and an intake cylinder. CONSTITUTION:A spring holder 32 comprising a bottomed cylindrical portion 32a, which has a flange portion 32c at the other end thereof, is engaged with the shaft end portion 22a of a valve stem at the bottom portion 32b by fitting and fixed thereto. Further an engaging member 33 is engaged with the shaft end portion 32a of a valve stem by fitting and fixed thereto. An inner torsion coil spring 31 is disposed between the shaft end portion 22a of the valve stem 22 and the spring holder 32, and an outer torsion coil spring 36 is disposed in the outer periphery of the spring holder 32, whereby the axial shifting is restrained by a flange portion 32c. The other ends of both torsion coil springs 31, 36 are engaged with the engaging member 33, and each one end thereof is engaged with a spring peg 28 of an intake cylinder 21. Thus it is not necessary to provide a notch on the spring holder 32, and a notch engaging portion of the valve stem 22 is formed only at the shaft end portion 22a, so that the manufacture can be simplified and lowering of mechanical strength can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake throttle valve return device for an engine used in a fuel injector, a carburetor, etc., and particularly relates to an improvement of a holding portion for a torsion coil spring.

[Conventional technology]

FIG. 3 is a longitudinal sectional view showing a conventional intake throttle valve return device disclosed in, for example, Japanese Patent Application Laid-Open No. 59-46345. 1 is a carburetor main body, 2 is a throttle valve, and is fixed to a valve shaft 3. 4
5 is a support arm fixed to the carburetor main body 1, and 5 is a dish-shaped collar presser which is fitted onto the valve stem 3 and supported in a locking manner, and is provided with a collar portion 6. 7.8 is a cylindrical collar with a flange that receives the outer torsion spring 9; 10.11 is a cylindrical collar with a flange that receives both ends of the inner torsion spring 120; 13.14 is fitted onto the valve stem 3 and is supported in a locking manner; Above cylindrical collar 7.10
a cylindrical sleeve 1 interposed between the two screws 9 and 8°11 to prevent contact or interference between the springs 9 and 12;
5 is a threaded spring end locking pin fixed to the carburetor main body 1, and 16 is a throttle valve lever connected to the shaft end of the valve shaft 3.

The other ends of the torsion springs 9 and 12 are each formed in the throttle valve lever 16 with a retaining portion: 17. l'7, and one end of each is also locked to the pin 15. In this way, both torsion springs 9 and 12 are wound and twisted around the valve shaft 3 so that the spring force acts in the direction of closing the throttle valve 2.

As shown in the plan view and side view in FIGS. 4 and 5, the dish-shaped collar presser 5 has notch ends 5a and 5b that sandwich a notch over an angular range α corresponding to the rotation angle of the valve shaft 3. is formed, and one end of the inner torsion spring 12 is pulled outward from this notch and is locked to the pin 15.

Further, as shown in the cross-sectional view in FIG. 6, the cylindrical sleeve 13 is also formed with cutout ends 13a and 13b that sandwich a cutout over an angular range corresponding to the rotation angle of the valve shaft 3. One end of the inner torsion spring 12 is pulled out from the inner torsion spring 12 .

As shown in FIG. 6, the valve shaft 3 has a notch locking portion 3a formed in parallel to the outer periphery from the support arm 4 to the shaft end. Engagement holes 5C and 13c are formed to engage with this notch engagement portion 3a.

[Problem that the invention seeks to solve]

In the conventional intake throttle valve return device described above, the inner torsion spring 12
In order to pull out one end, a wide range of holes are formed in the dish-shaped collar presser 5 and the cylindrical sleeve 13, which reduces mechanical strength, makes manufacturing complicated, and increases the number of parts. I scored very few points.

Furthermore, the valve stem 3 has a notch locking portion 3a formed from the 4th position W of the support arm to the shaft end, which reduces mechanical strength, and to compensate for this, the shaft diameter must be increased. The score has changed.

This invention was made in order to solve these problems, and the number of component parts is reduced, and a cutout part of the component part is retained in order to pull out one end of the inner torsion coil spring outward. It is an object of the present invention to provide an intake throttle valve return device for an engine, which is easy to manufacture, eliminates a decrease in mechanical strength, and eliminates a decrease in the strength of a valve shaft.

[Failure to solve the problem]

In the engine intake throttle valve return device according to the present invention, a spring holder, which is not a bottomed cylindrical part and is provided with a flange part at the other end, is fitted and fixed at the bottom part to the end part of the valve shaft, and further, Fit and lock the engaging member to the end of the valve shaft, place the inner torsion coil spring between the shaft end of the valve stem and the spring holder, and place the outer torsion coil spring around the outer periphery of the spring holder to form the 7-rank part. In order to suppress axial displacement, the other ends of both torsion coil springs are engaged and locked to a member, and each end is locked to a spring hook of the intake cylinder.

[Effect]

In this invention, one end of the inner coil passes through the space between the spring holder and the intake cylinder and is brought out to the outside and is locked to the spring catch of the intake cylinder, so that no notch is required in the spring holder. Also,
The spring holder is locked and fixed to the end portion of the valve shaft at the bottom, and the notch locking portion of the valve shaft only needs to be at the end portion.

Embodiment) FIG. 1 is a longitudinal sectional view showing an embodiment of the engine intake throttle valve return device according to the invention. 21 is an intake cylinder, and air is taken in in the direction of the arrow. Reference numeral 22 denotes a valve shaft that passes through the intake cylinder and is rotatably supported by a pair of bearings 23, with a shaft end 22a extending outwardly.
is being served. 24 is a throttle valve attached to the valve shaft 22;
Reference numerals 25 and 26 indicate a retainer for holding down the bearing 23, 27 a sealing member, and 28 a spring hook provided integrally or fixedly on the intake cylinder 21.

Reference numeral 29.30 denotes a cylindrical collar with a flange fitted to the shaft end 22a of the valve shaft 22, and is made of a wear-resistant synthetic resin material. 2
Reference numeral 1 designates an inner torsion coil spring received by these cylindrical collars 29 and 30, and one end of which is latched to a spring hook 28. Reference numeral 32 designates a spring holder consisting of a cylindrical portion 32a, a bottom portion 32t at one end, and a seven-rank portion 32c at the other end, and is fitted and locked onto the end portion of the valve shaft 22 at the bottom portion 32t). Reference numeral 33 denotes a disk-shaped engagement member, which has a spring hook portion 33a (forming an engagement portion) on its outer periphery, and is fitted and locked onto the end portion of the valve shaft 22. 34°35 is spring holder 3
It is a cylindrical collar with a flange that is fitted into the collar and is made of wear-resistant synthetic resin material. Reference numeral 36 designates an outer torsion coil spring received by these cylindrical collars 34 and 35, one end of which is engaged with the spring hook 28, and the other end of which is engaged with the spring hook portion 33a.

37 is a throttle valve lever that is fitted and locked to the end of the valve shaft 22, and is connected to the spring holder 32. by means of a nut 39 via a spring washer 38. It is fixed together with the engaging member 33, and a conductive wire from the actuator petal (all illustrations are omitted).
are connected to open and close the throttle valve 24.

As shown in FIG. 2, the spring holder 32. Engagement holes 32d, 33b and 3'7 are provided in the engagement member 33 and the throttle valve lever 37.
A is penetrated, and the other end of the inner threaded coil spring 31 is fitted and locked. Furthermore, the spring holder 32.
The engaging member 33 and the throttle valve lever 37 have a locking hole 32e,
33e and 371) are inserted into the end portion of the valve shaft 22, and are locked by the notch locking portion 22b thereof and rotated together with the valve shaft 22.

The inner and outer torsion coil springs 21 and 36 are twisted together so that the spring force acts in the direction of closing the throttle valve 24. Inside screw coil spring 31
One end is pulled out through a space between the spring holder 32 and the intake cylinder 21 side, and there are no parts in the middle, so it can be easily hung on the spring hook 28, and the various parts can be assembled and connected extremely easily.

〔Effect of the invention〕

As described above, according to the present invention, the outer torsion coil spring is fitted into the spring holder which is locked and fixed to the end portion of the valve shaft,
By suppressing axial displacement, one end of the inner torsion coil spring is pulled out from the space between the spring holder and the intake cylinder side, and is locked to the spring hook, making the structure simple and easy to manufacture. Mechanical strength is increased, the number of components is reduced, assembly is facilitated, and the strength of the valve stem is improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of an engine intake throttle valve return device according to the present invention, and Fig. 2 is! Figure 1 is a front view of the main parts of the screw holder, engaging member, and throttle valve lever, Figure 3 is a vertical cross-sectional view of a conventional intake throttle valve return device r, and Figures 4 and 5 are the collar presser shown in Figure 3. The plan view and side view of Figure 6 are the ■-■ of Figure 3.
FIG. 21... Intake cylinder, 22... Valve shaft, 22a... Shaft end, 22b... Notch locking part, 24... Throttle valve, 28
...Spring hook, 31...Inner torsion coil spring, 3
2... Spring holder, 32a... Cylindrical portion, 32b...
・Bottom, 32c...7 rung part, 32d...retaining hole, 32e...locking hole, 33...engaging part side, 33a・
... Spring hook part, 33b... Engagement hole, 33c... Locking hole, 36... Outer torsion coil spring.

Claims (1)

[Claims] A throttle valve disposed in an intake cylinder of an engine; a valve shaft that extends through the intake cylinder, is supported and fixes the throttle valve, and has at least one end extending outward to serve as a shaft end; and this shaft end. inner and outer torsion coil springs arranged concentrically in the intake cylinder, each having one end locked to a spring catch of the intake cylinder, and a flange part provided at the other end of a cylindrical part having a bottom part; is located between the two torsion coil springs, the bottom part is locked and fixed to the end part of the valve shaft, the other end is spaced apart from the intake pipe and passes through one end of the inner torsion coil spring, and a spring holder that prevents the outer torsion coil spring from coming off in the axial direction at the flange portion; An engine intake throttle valve return device comprising an engaging member that locks each other end of a coil spring.