JPH0313575Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of an idle speed control valve for an internal combustion engine.

<Prior art> Control of the engine speed during idling of an internal combustion engine is performed by controlling the flow rate of intake air passing through a bypass passage that communicates between the upstream and downstream sides of an intake throttle valve provided in the engine intake passage. be exposed.

A conventional example of an idle speed control valve that performs this type of flow rate control is shown in FIGS. 4 and 5 (see Japanese Utility Model Application No. 59-113575).

To explain this, a cylindrical valve seat 3 is formed in a housing 2 in which an intake air circulation passage 1 is formed that connects to a passage that bypasses the upper and downstream parts of an intake throttle valve (not shown). The intake air circulation passage 1 above and downstream of the valve seat 3 is communicated through the opening 3a.

Further, a cylindrical valve body 4 corresponding to the valve seat 3 is fixed to a hollow rotating shaft 5, and the hollow rotating shaft 5 is rotatably supported by the housing 2 via a fixed shaft 6 and bearings 7 and 8. let

As a result, the valve body 4 becomes rotatable around the axis of the hollow rotary shaft 5, and as the valve body 4 rotates, the opening area of the opening 3a formed in the valve seat 3 is increased or decreased, and the intake air is The flow rate of intake air supplied to the combustion chamber of the engine via the circulation passage 1 is increased or decreased, thereby controlling the idle speed of the engine.

An armature 10 is fixed to the hollow rotating shaft 5 via an insulating sleeve 9, and the magnetic core of the armature 10 has two types of coils whose winding axes are perpendicular to the hollow rotating shaft 5, that is, a valve opening coil 11A.
and a valve-closing coil 11B.

Then, a magnetic field generated by energizing one coil 11A, 11B and energizing the other coil 11B, 11A and a permanent magnet fixed to the inner wall of case 13, which is a part of the storage member near the outer periphery of armature 10. The rotational driving force acting between the valve and the magnetic field 12 generates torque in the valve-opening direction and the valve-closing direction, respectively.

Therefore, pulse signals are alternately supplied to both coils 11A and 11B, and each coil 11
By changing the ratio of energization times to A and 11B, that is, the duty ratio, the rotational driving force generated in the valve opening or closing direction changes in accordance with the duty ratio.

On the other hand, the valve body 4 is operated by a helical return spring 15, which has one end fixed to the housing 2, which is a part of the storage member, via a holder 14, and the other end fixed to the hollow rotating shaft 5, which rotates integrally with the armature 10. is elastically biased to an intermediate opening degree, and a return torque in the valve opening or closing direction by the return spring 15 is constantly applied to the armature 10.

Here, the housing 2 and the case 13 constitute a storage member.

The valve body 4, which rotates together with the armature 10, is held at a rotational position where the rotational driving force generated by energizing the coils 11A and 11B and the return torque by the return spring 15 are balanced, and the duty As the rotational position changes as the ratio changes, the opening area of the opening 3a (the flow rate of the intake air flowing through the intake air distribution passage 1 and being supplied to the combustion chamber of the engine) is adjusted. Engine idle speed is adjusted.

Note that 3b and 4b are sealing surfaces formed on the valve seat 3 and the valve body 4, respectively, to maintain a seal with the armature 10 side, and 16 is a stopper on the valve body 4 side that restricts the rotation range of the valve body 4. 17 is a stopper on the housing 2 side as well.

<Problems to be solved by the invention> By the way, conventionally, as shown in FIG. The return spring 15 is attached to the holder 14 by spot welding.
The other end of the return spring 15 is attached to the hollow rotating shaft 5 by spot welding a second bracket 19 to the hollow rotating shaft 5, as shown in FIG.

However, since the return spring 15 is simply sandwiched between the holder 14 and the first bracket 18 and they are spot welded, it is difficult to attach the return spring 15 to the holder 14 at a specified mounting position. If they shift from the specified mounting position, the holder 1 will be attached to the housing 2.
4, the holder 14 is tilted as shown by the chain line in FIG. As a result, when the holder 14 is caulked and fixed to the protrusion 2a of the housing 2, the above-mentioned inclination appears as a deformation of the return spring 15.
Due to this deformation, the return torque of the return spring 15 deviates from the specified value, and the coils 11A, 11
There is a problem in that manufacturing variations occur because the flow rate characteristics for the duty ratio signal to B deviate from the specifications.

The present invention was developed in view of the above circumstances, and an object of the present invention is to enable the return spring to be reliably attached to the holder at a substantially constant position.

<Means for solving the problem> For this reason, the present invention provides a holder that is attached to the storage member and to which one end of the return spring is attached.
A positioning part is formed to define the mounting position of the holder and the return spring, and the positioning part defines the mounting position of the return spring so that the return spring is mounted to the holder.

<Function> In this way, the positioning portion makes the mounting position of the return spring and the holder substantially constant.

<Examples> Examples of the present invention will be described below based on the drawings. In each embodiment, only the main parts will be explained, and the other elements are the same as the conventional example, so the explanation will be omitted.

FIG. 1 shows a first embodiment of the present invention.

In the figure, a plate-shaped bracket 22 is attached to a holder 21 that is caulked and fixed to a housing (not shown).
A pair of protruding portions 23 are formed as positioning portions with which one edge of the protrusions 23 abuts. This bracket 22
A recess is formed in which one end of a helical return spring 24 is fitted. Note that 25 is a hole for attaching the holder 21 to a housing (not shown).

According to this configuration, after one end of the return spring 24 is sandwiched between the holder 21 and the bracket 22, one edge of the bracket 22 is brought into contact with the pair of protrusions 23, and the holder 21 and the bracket 22 are spot-welded. Therefore, the return spring 24 can be attached to the holder 21 in a substantially constant position at all times. This prevents deformation of the return spring 24 from occurring, and even if deformation occurs, the deformation does not vary between products and remains constant. Therefore, the flow rate characteristics do not vary between products and are substantially constant.

2 and 3 show a second embodiment of the invention.

In this embodiment, a through hole 2 is inserted into both sides of the holder 26 through which one end of the return spring 27 is inserted.
8 are formed respectively. The holder 26 is provided with a thin portion 29 for caulking at an intermediate portion between the pair of through holes 28 . On the other hand, a hole 27a is formed at one end of the return spring 27, into which the thin portion 29 is inserted. 30 is a mounting hole to the housing.

According to this configuration, one end of the return spring 27 is inserted into one of the through holes 28 of the holder 26 from the front to the rear of the holder 26, and then the return spring 27 is inserted into the other through hole 28 from the rear of the holder 26 toward the front. Insert one end of 27. Therefore, one end of the return spring 27 is restrained by the pair of through holes 28, and the attachment position to the holder 26 is substantially constant, producing the same effect as in the previous embodiment. Then, by bending the thin wall portion 29, the outer periphery of the hole 27a of the return spring 27
Fix by caulking.

<Effects of the Invention> As explained above, in the present invention, since the attachment position of the return spring to the holder is defined, the return spring can be attached to the holder at a substantially constant position. Therefore, it is possible to suppress variations in their mounting positions among products, and to make the flow characteristics substantially constant.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of main parts showing a first embodiment of the present invention, Fig. 2 is a perspective view of main parts showing a second embodiment of the invention, Fig. 3 is a perspective view of the same as above from another position, Fig. 4 is a sectional view showing a conventional example of an idle speed control valve, Fig. 5 is a - arrow view of the same as the above, Fig. 6 is an exploded view of the main part of the same, Fig. 7 is a perspective view of the main part of the same as the above, and Fig. 8
The figure is a perspective view of another main part. 21, 26...Holder, 23...Protrusion, 2
4, 27...Return spring, 28...Through hole.

Claims (1)

[Scope of utility model registration request] A valve body that controls the flow rate of intake air in a bypass passage that bypasses an intake throttle valve, a valve body driving armature coupled to the valve body via a rotating shaft, and a housing that houses at least one of the valve body and the armature. a magnet disposed on the inner wall of the member; a holder attached to the inner wall of the housing member; one end attached to the holder and the other end attached to the rotating shaft; biased to maintain the valve body at an intermediate opening degree; In the idle speed control valve for an internal combustion engine, the holder includes a helical return spring;
A positioning part is formed to define the mounting position of the holder and the return spring, and the positioning part defines the mounting position of the return spring so that the return spring is mounted to the holder. Idle speed control valve for internal combustion engines.