JPS58196358A - Drive mechanism - Google Patents

Abstract

PURPOSE:To prevent increase of friction resistance between each member, by making one of worm gear or worm wheel of natural duracon, the other of fluorine duracon and the screw member of brass. CONSTITUTION:Upon forward/reverse rotation of a motor 25, a worm gear 26 will rotate to rotate a worm wheel 13 and to advance/back a screw 19 through corporation of the female screw section 13a of said worm wheel 13 and male section 19a of a screw 19 to expand/shrink a plunger 20. Here one of worm gear 26, worm wheel 13 is made of natural duracon, the other of fluorine duracon while the screw 19 of brass, thereby the friction resistance between the teeth of worm gear 26 and worm wheel 13 and between the female section 13a of the worm wheel 13 and the male section 19a of the screw 19 will not increase.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a worm gear mounted on a rotating l-1f function, a worm wheel meshed with the worm gear and rotatably mounted, and a worm wheel coaxially mounted with the worm wheel. 72111 member screwed together and mounted so as to be able to slide only in the axial direction; This invention relates to a drive mechanism configured to drive a member.

In this kind of conventional drive mechanism, the constituent crystal phase is generally composed of a metal material, and the relationship between the worm gear and the worm wheel is such that there is a rotational cliff! ! The worm wheel and the 72111 member are configured to convert the rotational motion into linear motion in the direction of the rotational axis, and the worm wheel and the 72111 member are configured to convert the rotational motion into linear motion in the direction of the rotational axis, and they mesh with each other. Because one slides with respect to the other 7+ between the toothed parts or between the threaded parts that screw together,
There were problems in that the frictional resistance between the teeth or the threaded portions was large, resulting in low efficiency, and furthermore, the wear was severe and the durability was poor. In particular, when a load is applied to the screw member from the driven part restraint, this acts as a force that increases the degree of adhesion between the threaded parts of the worm wheel and the screw member, increasing frictional resistance, making the above problem even more serious. Ta.

In view of the above-mentioned problems, the present invention consists of one of the worm gear and the worm wheel being made of natural Noyuracon material and the other being made of fluorine-containing Duracon material, and
To provide a drive mechanism in which the frictional resistance between the teeth of a worm gear and a worm wheel and between the teeth of a worm wheel and a screw member does not increase by configuring the screw member with a brass material. However, based on the drawings below, this is an example C in which this is used as an idling speed control actuator for an internal combustion engine.
2 is a throttle shaft, 3 is a throttle valve fixed to the throttle shaft 2, 4 is a throttle lever fixed to the throttle shaft 2 and has a bent portion 4a at one end, and 5 is a throttle shaft. 2, and is provided with a bent part 5a at one end and a bent part 5b having a hemispherical protrusion 5b' at the other end.
) are. 6 is the bent part 5 of the free reno-5 shaft part.
．． 1 and at the bent part of the throttle lever 4.
The adjusting screws are screwed together so that they can move forward and backward, and the head engages with the bending part 5a to connect both bending parts iJ[+5a, 4ai; A double bent portion 5a is provided in between and is wound around the shaft portion of the adjustment screw 6.
, 4a in opposite directions, and these constitute an adjustment mechanism capable of adjusting the distance between the two bent portions 5a, 4a. 8 is an idling speed control actuator, 9 is fixed to a bracket 10 protruding from the carburetor main body (not shown) with a set screw 11, and 1 is provided with a multi-stage cylindrical chamber 9a penetrating horizontally therein. 12 is a cylindrical chamber 9.
A two-stage guide ring 13 is inserted into the distal end of the guide ring 12. The distal end of the guide ring 13 is inserted into the rear end of the guide ring 12, and the one end of the guide ring 13 is rotatably inserted into the rear end of the cylindrical chamber 9a.
・A multi-stage cylindrical worm wheel with a female thread 13a inside, I4 is a guide ring 12
Of these, 11111 is an intermediate layer interposed between the stepped portion and the front end surface of the worm wheel 13, and 15 has a front end inserted into the rear end of the worm wheel 13 and a rear end of the rear end of the cylindrical chamber 9a. A cover 16 is fitted and fixed to the worm wheel 13 and is provided with a hole +5a having a hexagonal cross section in the tip thereof. A washer 17 is interposed between the bracket 10 and the cover 15. A washer 18 is an axial washer interposed between the step of the cylindrical chamber 9a and the outer step of the guide ring 12. The tips of the threads 11 and 19 for eliminating backlash are fitted into the guide ring 12, and the rear end of the hexagonal cross section is fitted into the hole 15a, so that rotation is prohibited and only slides in the axial direction. The male threaded portion 19a provided at the intermediate portion is screwed together with the female threaded portion 13a, and an axial hole 19 is formed inside.
20 is a plunger which is fixed to the tip of the screw 19 and can come into contact with the protrusion 5b' of the free lever 5 when the similar screw 19 advances fully in the drawing; 21 is the body 9; tip and Francia = 2
22 is a pin whose tip is inserted into the hole 19b and whose base is caulked to the cover 15; 23 is a retractable boot attached between the bottom wall of the hole 19b and the base of the pin 22; There is an intermediary layer between the screw 19' and the spring IJ ring, which is the same as the one on the right side of the drawing.
2 and tangent insect eyes.

A contact piece 25 is fixed to the cover 15 together with the pin 22 and connected to the output end of a computer (not shown), and a worm gear 26 is fixed to the upper part of the body 9 and meshes with the worm wheel 13 on its rotation axis. It is a motor to which a motor is fixed and whose rotation can be controlled by a computer. Furthermore, Pino 2
2. Spring 23. Screw 19, Franscher 2
0, 7 leper 5. protrusion 5b', adjustment screw 6, throttle lever 4. Throntle/Yaft 2 are both made of a proprietary material, and the tip of plunger 20 and 71
1-When the protrusion 5b/ of the lever 5 is in contact with the protrusion 5b/ of the lever 5, a peak path of the upper tif computer \ is formed by these. Therefore, the pusher 20 and the protrusion 5b' of the free valve 5 are the throttle valve 3.
This can serve as a detection device for detecting whether or not the opening degree of the valve is in the idling range. Father, at least cover 15.
The worm wheel 13° guide ring 12 is made of an insulating material.

A worm gear 26 constitutes a mechanism to which the power of the motor 25 is transmitted. The worm wheel 13 and the screw 19 are connected to the worm gear 26 and the worm wheel 1.
3 is made of natural Duracon material and the other is made of fluorocarbon Duracon material, and the screw 19 is made of brass material.

Next, the operation of the above-mentioned idling speed control device (to explain, when the accelerator pedal is depressed, the throttle valve 3 is at an opening position greater than the idling opening, so it is free as shown in the drawing. Protrusion 5 of lever 5
b' is away from the plunger 20, and the output circuit of the computer is in the OFF state (l).Therefore, the computer does not perform idling.Next, when the driver takes his foot off the accelerator pedal, the throttle Since the opening degree of the valve 3 becomes smaller, the protrusion 5b of the free valve 5
' contacts the plunger 20, the output circuit of the computer is turned on, and as a result, an idle nog detection signal is sent to the computer, so that the computer starts operating. At this time, the motor 25 is set to 0 kniter depending on the divine stopping conditions such as engine temperature and cooler operation.
The worm wheel 13 is rotated by the rotation of the worm gear 26, and the screw 19 is rotated by the cooperation between the female screw portion 13a of the worm wheel 13 and the male screw portion 19;1 of the stem 11. The plunger 20 is moved back and forth to cause expansion and contraction of the plunger 20.

When the plunger 20 is extended, the protrusion 5b' is pushed and the free lever 5 is rotated to the right together with the throttle lever 1, and when the plunger 20 is extended, it is applied to the throttle lever 4. The throttle lever 4 has its protrusion 5h' pressed against the plunger 20 by the action of the return line 11 (not shown).
is rotated to the left together with the free lever 5. Therefore, the opening degree of the throttle valve 3 is changed as the plunger 20 expands and contracts. Then, the idling speed is changed to the automatic side, and in this process, the idling speed is changed between the teeth of the worm gear 26 and the worm wheel 13, and between the teeth of the worm wheel 13.
One slides relative to the other between the threaded parts of the worm wheel 13 and the screw 19, and when a load is applied to the screw 19 from the 7-leaper 5, this increases the degree of closeness between the worm wheel 13 and the threaded parts of the screw 19. It acts as a force, but
As mentioned above, the worm gear 26 and the worm wheel 1
3 is made of natural Duracon material and the other is made of fluorine-produced Kuduracon material, and the screw 19 is made of brass material, so that the frictional resistance between the two toothed parts and the threaded part is reduced. does not increase. Therefore, compared to conventional devices, efficiency is higher, wear is reduced, and durability is also improved. Historically, since the worm gear 26 and the worm wheel 13 are made of synthetic resin, the device is lightweight. In particular, the improvement in durability will be explained in detail based on the experimental results vC shown below.

Experimental Results The worm gear 26 and the worm wheel 13 were made of several kinds of synthetic resin materials, and the screw 19 was made of several kinds of conductive materials. The female threaded portion 1 of the worm wheel 13 was examined for scraping. Then, the worm gear 26 is made of natural duracon material, and the worm wheel 13 is made of glass-filled PBT material.
In the case where the worm gear 26 was made of natural duracon material, the continuous operation time was short, and the teeth of the worm gear 26 and the female threaded part 13a of the worm wheel 1 were severely damaged. 1. Wheels 13 and 19 made of duracon material containing kefune and frame 11 and 19 made of brass have a long continuous operation time (10
0 time is above) and part a of the worm gear 26 and the female threaded part 13 of the worm wheel I3. Almost no scratching of I occurred. And, when the SKU II unit 19 is made of brass material with dome wood, the continuous operation time is longer. Thus, one of the worm gear 26 and the worm wheel 13 is made of natural Duracon material, and the other is made of amateur-made Duracon material, and
If the screw 19 is made of brass material, the worm gear 36
It was confirmed that the frictional resistance between both toothed portions of the worm wheel 13 and between both threaded portions of the worm wheel 13 and the screw 19 did not increase.

As mentioned above, the drive mechanism according to the present invention has the important practical advantages of high efficiency, durability, and light stitching ratio.

[Brief explanation of the drawing]

The Hgt plane is a longitudinal sectional view of an idling speed control actuator which is an embodiment of the drive mechanism according to the present invention. 8. Idling speed control actuator, 13
...worm wheel, 15...cover, 19...
・Screw, 26... Worm gear.

Claims (1)

[Scope of Claims] A worm gear rotatably mounted, a worm wheel meshed with the worm gear and rotatably mounted, and a worm wheel coaxially screwed with the worm wheel in the axial direction. and a suction member mounted so as to be able to slide only on. nil sr' In a drive mechanism configured to drive another member by rotating the worm wheel by a worm gear and moving the screw member forward and backward in the axial direction, either one of the worm gear and the worm wheel is driven. A drive mechanism characterized in that the oil force is made of natural duracon material, and the screw member is made of brass material.