JPH0772499B2 - Engine intake throttle return device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake throttle valve return device for an engine used for a fuel injector, a carburetor, etc., and particularly relates to improvement of a holding portion of a torsion coil spring.

[Conventional technology]

FIG. 3 is a longitudinal sectional view showing a conventional intake throttle valve returning device disclosed in, for example, Japanese Patent Laid-Open No. 59-46345. Reference numeral 1 is a carburetor main body, and 2 is a throttle valve, which is fixed to a valve shaft 3. Reference numeral 4 is a support arm fixed to the carburetor main body 1, 5 is a dish-shaped collar retainer fitted and supported by the valve shaft 3, and a collar portion 6 is provided. 7 and 8 are tubular collars with collars that receive the outer torsion springs 9, 10 and 11 are tubular collars with collars that receive both ends of the inner torsion springs 12, 13 and 14 are fitted and retained by the valve shaft 3 for locking support. Cylindrical sleeves 15 interposed between the cylindrical collars 7 and 10 and 8 and 11 to prevent contact and interference between the torsion springs 9 and 12, and 15 are torsion springs fixed to the carburetor body 1. The end locking pin 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 both locked to the engaging portions 17 and 17 formed on the throttle valve lever 16, and each one end is also locked to the pin 15. Thus, the 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 the side view of FIGS. 4 and 5, the dish-shaped collar presser 5 has cutout ends 5a, 5b which sandwich a cutout portion 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.

Also, as shown in the sectional view of FIG. 6, the cylindrical sleeve 13 is also formed with notched ends 13a and 13b that sandwich a notched portion over an angular range corresponding to the rotation angle of the valve shaft 3, and the notched portion is formed. One end of the inner torsion spring 12 is drawn outward from the.

As shown in FIG. 6, the valve shaft 3 is formed with a notch engaging portion 3a parallel to the outer circumference from the supporting arm 4 portion to the shaft end, and the dish-shaped collar retainer 5 and the tubular sleeve 13 are provided with the notch engaging portion 3a. Engagement holes 5c and 13c that engage with the notch engaging portion 3a are formed.

[Problems to be solved by the invention]

In the above conventional intake throttle valve returning device, since one end of the inner torsion spring 12 is pulled out, the dish-shaped collar retainer 5 and the tubular sleeve are provided.
Since 13 has a wide range of cutouts, the mechanical strength is lowered, the manufacturing is troublesome, and the number of parts is increased.

Further, the valve shaft 3 has a notch locking portion 3a formed from the position of the supporting arm 4 to the shaft end, which lowers the mechanical strength, and there is a problem that the shaft diameter must be increased to compensate for this. Atsuta

The present invention has been made to solve such a problem, and the number of components is reduced, and a notch portion of the component is required for pulling out one end of the inner torsion coil spring to the outside. 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 the mechanical strength reduction, and eliminates the deterioration of the valve shaft strength.

[Means for solving problems]

An intake throttle valve return device for an engine according to the present invention comprises a bottom portion fixed between the inner and outer torsion coil springs and fixed to the valve shaft, a cylindrical portion continuous with the bottom portion, and a flange portion formed at the tip of the cylindrical portion, Moreover, a spring holder for keeping a space between the intake cylinder and the intake cylinder is provided, and the spring holder is overlapped with the throttle valve lever and the bottom of the spring holder to be fixed to the valve shaft to lock the outer ends of both torsion coil springs. An engagement member is provided, and the inner end of the inner torsion coil spring is locked to the spring hook through the space between the spring holder and the intake cylinder.

[Action]

In the present invention, one end of the inner coil is passed outward through the space between the spring holder and the intake cylinder side and is brought out to the outside to be locked by the spring hook of the intake cylinder, so that the spring holder does not need a notch. Also,
The spring holder is locked and fixed to the end portion of the valve shaft at the bottom portion, and the cutout locking portion of the valve shaft may be only the end portion.

〔Example〕

FIG. 1 is a longitudinal sectional view showing an embodiment of an intake throttle valve returning device for an engine according to the present invention. Reference numeral 21 is an intake cylinder that is inhaled in the direction of the arrow. Reference numeral 22 is a valve shaft that penetrates the intake cylinder and is rotatably supported by a pair of bearings 23, and has a shaft end 22a extending outward. 24 is a throttle valve mounted on the valve shaft 22, 25 and 26 are bearings 2
A pressing plate that presses down 3, 27 is a seal member, and 28 is a spring hook provided integrally with or fixed to the intake cylinder 21.

Numerals 29 and 30 are tubular collars with a collar fitted to the shaft end 22a of the valve shaft 22, and are made of a wear-resistant synthetic resin material. Reference numeral 31 denotes an inner torsion coil spring received by these tubular collars 29, 30, one end of which is locked by a spring hook 28. 32 is a cylindrical portion 32
The spring holder is composed of a, a bottom portion 32b at one end, and a flange portion 32c at the other end, and is fitted and locked to the end portion of the valve shaft 22 at the bottom portion 32b. Reference numeral 33 is a disc-shaped engaging member, which is provided with a spring hooking portion 33a forming an engaging portion on the outer periphery, and is fitted and locked to the end portion of the valve shaft 22. 34 and 35 are spring holders 3
It is a tubular collar with a collar attached to 2, made of abrasion-resistant synthetic resin material. Reference numeral 36 denotes an outer torsion coil spring received by these tubular collars 34, 35, one end of which is locked to the spring hook 28 and the other end of which is locked to the spring hook 33a. Reference numeral 37 denotes a throttle valve lever fitted and locked to the end portion of the valve shaft 22, fixed together with the spring holder 32 and the engaging member 33 by a nut 39 via a spring washer 38, and a conductive wire from the accelerator petal ( Any of which is omitted in the drawing) is connected to open and close the throttle valve 24.

As shown in FIG. 2, the spring holder 32, the engaging member 33 and the throttle valve lever 37 are penetrated with engaging holes 32d, 33b and 37a, and the other end of the inner torsion coil spring 31 is fitted and locked. Has been done. Further, the spring holder 32, the engaging member 33 and the throttle valve lever 37 are provided with locking holes 32e, 33c and 37b,
The valve shaft 22 is fitted into the end portion of the valve shaft 22, is locked by the notch locking portion 22b, and is rotated integrally with the valve shaft 22.

The inner and outer torsion coil springs 31 and 36 are twisted and assembled so that the spring force acts in the direction of closing the throttle valve 24. One end of the inner torsion coil spring 31 is drawn out through a space between the spring holder 32 and the intake cylinder 21 side, there are no parts in the middle, and the spring hook 28 can be easily hooked.
Assembly and connection of each part can be performed very easily.

〔The invention's effect〕

As described above, according to the present invention, the outer torsion coil spring is fitted to the spring holder that is locked and fixed to the end portion of the valve shaft,
Since one end of the inner torsion coil spring is pulled out from the space between the spring holder and the intake cylinder side and locked to the spring hook, the structure is simple and manufacturing is easy, the mechanical strength is increased, and the component parts Less and easier to assemble. In addition, the strength of the valve shaft is improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of an intake throttle valve returning device for an engine according to the present invention, FIG. 2 is a front view of essential parts of a screw holder, an engaging member and a throttle valve lever of FIG. 1, and FIG. Is a longitudinal sectional view of a conventional intake throttle valve returning device, FIGS. 4 and 5 are plan and side views of the collar presser of FIG. 3, and FIG. 6 is VI-VI of FIG.
It is sectional drawing in a line. 21 ... Intake cylinder, 22 ... Valve shaft, 22a ... Shaft end part, 22b ... Notch locking part, 24 ... Throttle valve, 28 ... Spring hooking, 31 ... Inner torsion coil spring, 32 ... ... Spring holder, 32a ... Cylindrical part, 32b ... Bottom part, 32c ... Flange part, 32d ... Engaging hole, 32e ... Locking hole, 33 ... Engaging member, 33a ... Spring engaging part, 33b ...... Engagement hole, 33c …… Locking hole, 36 …… Outside torsion coil spring. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A throttle valve lever connected to an outer end of a valve shaft of a throttle valve arranged in an intake cylinder of an engine, and one end of which is locked by a spring hook on the intake cylinder side and the other end is the throttle valve lever. In an intake throttle valve return device for an engine, which is provided with an inner and outer torsion coil springs interlocked with the above, a bottom portion and a cylindrical portion provided between the inner and outer torsion coil springs and fixed to the valve shaft, and formed at an end portion of the cylindrical portion. And a bottom portion of the spring holder, which is provided between the throttle valve lever and the bottom portion of the spring holder, and a spring holder configured to maintain a gap between the intake cylinder and the intake cylinder. And an engaging member that is fixed to the valve shaft by overlapping with the other end of the inner and outer torsion coil springs, and one end of the inner torsion coil spring of the inner and outer torsion coil springs is the spring holder and the intake cylinder. Engage with the above spring through the space Intake throttle valve return system of the engine, characterized in that the.