JP3208244B2 - Coil spring mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring mounting device.

[0002]

2. Description of the Related Art Conventionally, as an air flow control device for controlling the flow of air to an internal combustion engine, a device as shown in FIG.
No. 32229.

[0003] As shown in FIG.
An air supply passage 2 formed in a throttle body 1, a throttle valve 3 for opening and closing the air supply passage 2, a throttle shaft 4 to which the throttle valve 3 is fixed, and an opening direction of the throttle shaft 4 when the accelerator pedal is depressed. Throttle lever 5 for turning to
And a back spring 6 for urging the throttle valve 3 in the closing direction via the throttle shaft 4.

[0004] In recent years, with the high-speed rotation of the internal combustion engine, the vibration transmitted from the internal combustion engine to the air amount control device has become complicated and severe. Therefore, the vibration may be transmitted to the back spring 6 and the back spring 6 may be broken.

In view of the above, even if one back spring is broken by using a plurality of the back springs, the throttle valve is closed by another back spring to improve safety. Is increasing.

Usually, a sensor for detecting the opening of the throttle valve is provided on one side of the throttle shaft, so that the plurality of back springs are wound multiple times around the other side of the throttle shaft. Provided in state.

As a mounting structure for such a multiple winding back spring, for example, as shown in FIG. 3, two back springs 8 and 9 are double wound around a spring guide 7 provided on the outer periphery of the throttle shaft 4. And hook portions 8a, 9a on one end side are locked to locking portions 1a of the throttle body 1, and hook portions 8b, 9b on the other end side are connected to a throttle arm 10 fixed to the throttle shaft 4. Stopped. In this case, the plurality of hook portions 8b and 9b are arranged close to each other due to space issues.

[0008] From such a thing, the back spring
The other end hooks 8b, 9b and the throttle arm 10
Is conventionally as shown in FIG. sand
That is, a spring member formed on the throttle arm 10
The stop hole 11 is formed by a plurality of back springs 8 and 9
Slotted shape so that the hooks 8b and 9b on the end side can be locked
(Or groove shape) and the hole width L₁Dimensions
Are hook portions 8 of the back springs 8 and 9.
b and 9b which are larger than the maximum wire diameter and
Wire diameter φd of the hook portions 8b and 9b₁, Φd₁In total
Some 2φd ₁It is set larger than.

[0009]

SUMMARY OF THE INVENTION It is an object of the two holes width L ₁ of the spring locking hole 11 as described above prior art are adjacent hook portion 8b, in which is formed larger than the sum of the wire diameter. 9b If the back springs 8 and 9 are deformed at the time of attachment, or due to other factors,
When the throttle valve is operated after the attachment, FIG.
As shown in (1), one of the hooks 8b, 9b may move toward the other 8b and ride on or over the other hook 8b. Thus, the hook portions 8b, 9
When the normal arrangement of b is broken or reversed, the moved back spring is twisted or both hooks 8
The interline wear between b and 9b increases, and the back spring may be broken early.

Accordingly, the present invention provides a spring locking device which can prevent the hook portion of a spring having a multiple winding structure from climbing as described above, thereby reducing the wear of the spring and improving the durability. It is intended to provide.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a structure having three or more wires and having a small wire diameter.
Be one that engaging the hook of the coil spring made of those having a diameter one parallel arranged to the elongated hole-like or groove-shaped engagement hole, the hook portion of any adjacent two The wire diameter of one hook portion is smaller than the sum of the wire diameters of two adjacent hook portions, and the width dimension of the locking hole in a direction orthogonal to the longitudinal direction of the locking hole is (3) The wire diameter is set to be larger than the wire diameter of the hook portion having the largest diameter among the three or more hook portions and smaller than the sum of the wire diameters of two hook portions adjacent to each other.

[0012]

[Function] Wire diameter of hook portions (19b, 20b, 21b)
And the width of the locking hole (22) (L _Two) Is described in claim 1
Condition, one of the adjacent hooks
Ride or move to the other side and the regular array collapses
Is prevented.

[0013]

Next, an embodiment of the present invention will be described with reference to FIG.
Reference numeral 12 denotes a throttle body, which forms an air supply passage 12a communicating with an internal combustion engine (not shown).

A throttle valve 13 for opening and closing the air supply passage 12a is fixed to a throttle shaft 14 rotatably provided on the throttle body 12. One end of the throttle shaft 14 projects laterally from the throttle body 12 as shown, and the other end is connected to a detector of an opening sensor for detecting the opening of the throttle valve 13, which is not shown. .

A throttle lever 15 and a throttle arm 16 are fitted to one end of the throttle shaft 14,
These are fastened to the throttle shaft 14 by nuts N, so that the throttle shaft 14 and the throttle arm 16 rotate in conjunction with the rotation of the throttle lever 15.

The two legs 16a, 16 of the throttle arm 16
A pair of left and right spring guides 17 and 18 are slidably inserted through the throttle shaft 14 between b.

Reference numeral 19 denotes a back spring composed of one coil spring, and reference numerals 20 and 21 denote back springs composed of two double torsion springs, which are located inside and outside the partitioning cylinder portions 17a and 18a of the spring guides 17 and 18. It is provided in a multiple winding state in a separated state.

The three back springs 19, 20,
Both ends of each of the first and second members 21 are linearly bent outward in the radial direction, and are respectively hooked 19a, 20a, and 21a.
And hook portions 19b, 20b and 21b. One of the three hook portions 19a, 20a, and 21a is locked by the locking portion 12b of the throttle body 12, and the other three hook portions 19b, 20b, and 21b are formed by locking holes formed in the throttle arm 16. 22 is inserted and locked,
These three back springs 19, 20, 21 urge the throttle valve 13 in the closing direction.

Next, the back springs 19, 20, 2
The relationship between the other hook portions 19b, 20b, and 21b of FIG. 1 and the locking holes 22 through which the hook portions 19b are inserted will be described in detail with reference to FIGS. 1B and 1C.

In FIG. 1, reference numeral 22 denotes a locking hole formed in the throttle arm 16, and reference numerals 19b, 20b, and 21b denote the three hooks. The locking hole 22 is formed in a long hole shape along the arrangement direction of the three hook portions 19b, 20b, 21b.

The three hooks 19b, 20b,
Dimension L ₂ of the arrangement direction and the direction of the locking hole width perpendicular (the longitudinal direction of the locking hole 22) of 21b is set as follows. As shown in FIGS. 1B and 1C, each hook 19
When the wire diameters of b, 20b and 21b are the same,
When the wire diameter is φd ₁ , the dimension L ₂ of the locking hole width is φd
₁ <is set in the relationship of L ₂ <2φd _1. By setting the dimension L ₂ Thus, the inner surface 22a opposite to the inner surface of the side where the hook portion 19b, 20b, 21b are in contact in the locking hole 22, the hook portion outer peripheral surface opposed to the inner surface 22a gap size between the L ₃ is the wire diameter φ of each hook portion
It is smaller than the dimension of d _1.

Therefore, the adjacent hook portions 19b and 2b
Between 0b or 20b and 21b, one hook cannot ride on the other hook. This, of course, also prevents one hook from moving over the other hook to the opposite side.

Note that, as an example of specific values of d ₁ and L ₂ , d ₁ = 1.2 mm and L ₂ = 2.3 mm. Next, when one of the above back springs 19, 20, and 21 has a large spring coefficient, that is, when one of the back springs is a hook having a large wire diameter, the wire diameter and the width of the locking hole are determined. The relationship between the dimensions will be described with reference to FIG.

FIG. 2 (a) shows a hook portion 23 having a large diameter φd ₂ arranged in the middle, and a hook portion 2 having a small diameter φd _{1 on} both sides thereof.
4, 25 are arranged. In this case, the locking hole 2
2 of the width L _2, the dimensions of the maximum diameter of the hook portion 23 .phi.d ₂
It is necessary to set a larger value, and it is necessary to prevent one hook from riding on the other hook between the adjacent hooks 23 and 24 or 23 and 25. Therefore, L ₂ is φd ₂ <L ₂ <(φd ₁
+ Φd ₂ ).

To satisfy the above two inequalities, L ₂ is
What is necessary is to set it larger than the wire diameter of the hook part with the largest diameter among the hook parts to be locked, and smaller than the total value of the wire diameters of two adjacent hook parts.

The above inequality φd ₂ <L ₂ <(φd ₁ +
Even if φd ₂ ) is satisfied, as shown in FIG. 2B, the large-diameter hook portion 23 is disposed at the extreme end, and the small-diameter hook portions 24 and 25 are disposed adjacent to each other. If the wire diameter φd ₂ of the hook portion 23 is twice or more than that of the hook portions 24 and 25, the hook portions 24 and 25 cannot be prevented from running over each other. Is done.

Therefore, in order to exclude this, the wire diameter of one hook portion in any two adjacent hook portions must be smaller than the sum of the wire diameters of the two adjacent hook portions. Is a condition.

That is, under such preconditions, by forming the locking hole 22 satisfying the above inequality,
The hook portion can be prevented from running. Next, control of the air amount will be described with reference to FIG.

When the accelerator pedal (not shown) is depressed, the throttle lever 15 rotates in the opening direction, and the throttle arm 16 and the throttle shaft 14 fixed to the throttle lever 15 open in the opening direction against the urging forces of the back springs 19, 20, and 21. , And the throttle valve 13 opens by an opening corresponding to the depression amount of the accelerator pedal.

When the depression of the accelerator pedal is released, the throttle arm 16 and the throttle shaft 14 rotate in the closing direction by the urging forces of the back springs 19, 20, and 21, and the throttle valve 13 is closed.

Due to the opening / closing operation of the throttle valve and the vibration of the internal combustion engine, the back springs 19, 20,
Even when a moving force is generated in the hook portions 19b, 20b, 21b of the hook 21, the locking holes 22 for locking the hook portions 19b, 20b, 21b are formed as described above.
It is possible to prevent the b and 21b from riding on each other and to prevent the regular arrangement from being broken, and to reduce line wear between the back springs.

Although the above embodiment is an example in which three springs are used as the back spring, the present invention can of course be applied to the case where three or more back springs are used. The above embodiment is an example in which the present invention is applied to a back spring of a throttle body in an internal combustion engine using gasoline fuel.
The same operation and effect can be exerted even when applied to the throttle back spring of the PG mixer.

Further, the present invention is not limited to the back spring of the throttle valve in the throttle body as described above, and the present invention is also applied to a portion for locking a hook portion when a multiple winding spring is used in other devices. Needless to say, in this case, the same operation and effect as described above can be exerted.

[0034]

As described above, according to the present invention, there is provided a coil spring having a multiple winding state, wherein each of the hook portions is formed by one coil.
In what is arranged and locked in parallel in the individual locking holes,
Each hook portion can be prevented from climbing on an adjacent hook portion and the normal arrangement state can be prevented from being destroyed. Therefore,
It is possible to prevent line wear caused by the above-described riding or the collapse of the arrangement, to reduce the line wear of the spring, and to improve the durability of the spring.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, wherein FIG. 1A is a plan sectional view, FIG. 1B is a side view showing a dimensional relationship between a hook portion and a locking hole, and FIG. FIG.

FIGS. 2A and 2B show another example of a dimensional relationship between a hook portion and a locking hole, wherein FIG. 2A is a diagram to which the present invention is applied, and FIG.

FIG. 3 is a plan sectional view showing a conventional structure.

4A and 4B show a dimensional relationship between the hook portion and the locking hole, wherein FIG. 4A is a side view, and FIG. 4B is a diagram viewed from the left side of FIG.

[Explanation of symbols]

19, 20, 21 ... Coil spring 19b, 20
b, 21b ... width dimension of the hook portion 22 ... locking hole L ₂ ... locking hole

Claims (1)

(57) [Claims] 1. A wire having three or more wires and having a small wire diameter and a wire having a small wire diameter.
Be one that engaging the hook of the coil spring made of those having a diameter one parallel arranged to the elongated hole-like or groove-shaped engagement hole, the hook portion of any adjacent two The wire diameter of one hook portion is smaller than the sum of the wire diameters of two adjacent hook portions, and the width dimension of the locking hole in a direction orthogonal to the longitudinal direction of the locking hole is A coil spring mounting structure characterized in that it is set to be larger than the wire diameter of the hook portion having the largest diameter among the three or more hook portions and smaller than the sum of the wire diameters of two adjacent hook portions.