JP2000170809A - Compression coil spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble a compressin coil spring without falling down a spring without taking the antifalling-down countermeasure by shifting the phase of a winding angle of a linear material by a predetermined angle at both ends of the compression coil spring. SOLUTION: A phase of a winding-end side end (B) of a compression coil spring 10 is shifted from a winding-start side end (A) by 180 deg.. For this purpose, a compression coil spring is manufactured in a state that N+0.5 winding (N is an integer) is satisfied as the total of the effective winding number and the closed winding number at both ends from the winding-start side end (A) to the winding-end side end B. By applying this structure, the coil side end (B) at an upper end side can be approximately horizontally kept even when a lower end side of the compression coil spring 10 is inclined to a side opposite to the coil side end A at a lower side after an assembling base. Accordingly, the power is applied to the compression coil spring 10 just from its upper part when the assembling parts are set from an upper part in such state, whereby the function of the spring can be exercised in a normal state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression coil spring to be assembled to a target product when the product is assembled by an automatic assembling machine, for example.

[0002]

2. Description of the Related Art In recent years, production by an automatic assembling machine has been performed in various fields, and a compression coil spring to be assembled to a target product has been frequently used. The phases of both ends of this compression coil spring vary depending on the effective number of turns. In other words, if the number of effective turns becomes an integer, the beginning and end of the spring are in the same phase (position), and if it is not an integer (if the decimal point is also specified), the phase is shifted by the decimal point. I have. Further, usually, the ends are closely wound, and the number of turns is added to determine the phase.

[0003]

Generally, the number of effective windings is often an integer, and the number of closely wound portions at the ends is also often an integer. In this case, as shown in FIG. When the compression coil spring 30 is first set on the base 31 to be assembled, FIG.
As shown in (1), the winding stands at the opposite side to the end portion C. In this state, the upper end surface of the compression coil spring 30 is inclined more than that.

In this state, as shown in FIG. 4, when the assembled component 41 is set from above and pressed, the spring 30 often falls down to the inclined side as shown in FIG. Was. For this reason, it is necessary to take measures to prevent the spring from falling down, such as forming a concave portion on the base or the component side where the spring does not fall, and the processing cost increases the component cost. In addition, if such recesses, bosses, and ribs are provided to prevent overturning, the stroke will be shortened by the height,
In many cases, measures to prevent the product itself from falling down cannot be taken due to product functions.

Further, when supplying a spring to an automatic assembling machine,
In many cases, the springs are entangled with each other and supply is not successful, and work such as manual entanglement is required, which reduces the operation rate of the automatic machine.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a compression coil spring that does not cause an increase in cost for preventing the above-mentioned fall.

Another object of the present invention is to provide a compression coil spring which can be securely assembled without falling down even when a fall prevention measure cannot be taken.

It is still another object of the present invention to provide a compression coil spring that does not become entangled with each other when the spring itself is supplied.

[0009]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a compression coil spring according to the present invention is a compression coil spring formed by spirally winding a wire, and a phase of a winding angle of the wire is shifted by 180 ° at both ends of the compression coil spring. It is characterized by having.

Further, in the compression coil spring according to the present invention, both ends of the compression coil spring are wound tightly.

Further, in the compression coil spring according to the present invention, when the total number of close windings at both ends is an integer, the number of windings of the effective portion is (integer + 0.5), and When the number of turns is an integer, the total number of turns of the contact winding is (integer + 0.5).

Further, in the compression coil spring according to the present invention, the contact height of the contact winding portions at both ends is larger than the winding interval of the compression coil spring when no load is applied.

Further, in the compression coil spring according to the present invention, the compression coil spring is used for automatic assembly.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the compression coil spring of the present invention.

In FIG. 1, a compression coil spring 10 in which a wire for a spring is spirally wound has N + 0 from the winding start side end A to the winding end side end B, including the number of effective windings and the number of tightly wound ends at both ends. It is manufactured as .5 turns (N is an integer). If the total number of turns of the contact winding portions at both ends is an integer, the effective number of turns is (integer + 0.5) turns. If the total number of turns of the end contact portion is (integer + 0.5) turns, the effective number of turns is Is an integer. By doing so, the winding end side end B is 180 ° out of phase with the winding start side end A.

FIG. 2 is a configuration diagram of a conventional compression coil spring. In the case of this example, the effective number of turns and the number of close contact turns at both ends are an integer, and the winding start side end C and the winding end side end D have the same phase.

In FIG. 1, the height G of the end contact portion is shown.
Is smaller than the width H between the windings.

FIG. 3 is an explanatory view showing a state in which a conventional compression coil spring 30 is set on an assembly base 31. When the mounting base 31 is horizontal, the lower end side of the compression coil spring 30 follows the mounting base 31, so that the compression coil spring 30
Is inclined to the opposite side to the lower winding end C, whereby the upper end is set to be in a state of being greatly inclined with respect to the horizontal plane.

FIG. 4 is an explanatory view showing a case where a conventional compression coil spring is set on an assembly base 31 and then an assembly component 41 is set from above. When the assembly component 41 is set from above in a state where the compression coil spring 30 is inclined as shown in FIG. 4, an obliquely upward force is applied to the compression coil spring 30. When the assembly part 41 is manually set in such a state, the assembly direction, the assembly force, and the assembly speed are adjusted as appropriate while observing the state of the spring, or the phase is changed by rotating the spring to devise. Therefore, the spring hardly falls down. However, in the case of assembling using an automatic machine, the situation is not determined as in the case of manual operation, and the assembly is performed by a predetermined operation. Therefore, the assembly part 41 is simply assembled regardless of the inclination direction of the spring as shown in FIG. Push it down. Also, it is very difficult to determine the phase of the spring in advance and set it on the assembly base, so that even if a device for the determination is added, a great deal of equipment cost is required and the cost is increased.

FIG. 5 is an explanatory view of a state in which the assembled component 41 is pressed downward in the state of FIG. 4 and assembled. As described above, when the compression coil spring 30 is inclined and is pressed from above in this state, the compression coil spring 30 is largely bent in the lateral direction and finally falls down.

FIG. 6 is an explanatory view showing a state in which the compression coil spring 10 according to one embodiment of the present invention is set on an assembly base 31.

Since the lower end of the compression coil spring 10 follows the assembly base 31, the compression coil spring is inclined to the opposite side to the lower winding end A, but the upper winding end B is 180 ° out of phase. Therefore, the upper end portion remains almost horizontal.

FIG. 7 is an explanatory view showing a case where the compression coil spring 10 according to one embodiment of the present invention is set on the mounting base 31 and then the mounting component 41 is set from above. Although the compression col spring 10 itself is in an inclined state, the upper end is horizontal, so that even when the assembly component 41 is set from above, a force is applied to the compression coil spring 10 from directly above.

FIG. 8 is an explanatory view showing a state in which the assembled component 41 is pressed downward in the state of FIG. 7 and assembled. Since both the upper end and the lower end are horizontal as described above, even when pressed from above, the compression coil spring 10 can exhibit its function as an original spring in a normal state.

FIG. 9 is a diagram showing the relationship between the width H between the windings and the height G of the tightly wound portion at the tip end of the compression coil spring 10 of one embodiment. The upper part of FIG. 9 shows an arbitrary position between the windings, and the width (= distance between the line centers) is set to H. The lower part of FIG. 9 shows the contact winding portion at the tip, and its height (= distance between the line centers of the contact portions) is G. A spring is manufactured so that the relationship between H and G satisfies H ≦ G. Then, in the feeder such as the parts feeder when supplying the spring to the automatic machine, only the springs of the same type and the same length are in a state where the springs overlap each other and the side surfaces of the springs are pressed against each other. In this case, the end of the spring does not enter between the windings in the middle of the spring, and it is possible to prevent the end from being entangled and falling into a state in which it cannot be separated by a parts feeder or other automatic machine.

It should be noted that the present invention can be applied to a modification or modification of the above embodiment without departing from the spirit thereof.

[0028]

As described above, according to the present invention, there is no increase in the cost of the spring, and the failure of the spring to fall when the spring is assembled by the automatic machine can be greatly reduced.

Conventionally, it has been necessary to process the mounting surface on the part to be mounted or take measures to prevent it from falling down. However, this is no longer necessary, and the processing cost for these can be reduced.

Further, since the entanglement between the springs during the automatic supply of the springs is eliminated, the operation rate of the automatic machine can be greatly improved.

Even during manual assembling where the parts to be assembled do not have a fall prevention function, fine adjustments of the assembling direction and the assembling force as in the prior art are not required, so that the assembling speed can be improved, and as a result, the number of assembling steps can be improved. The number of man-hours for reassembly confirmation and rework after assembly can be greatly reduced, and assembling costs can be reduced.

[0032]

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a compression coil spring of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional compression coil spring.

FIG. 3 is an explanatory view of a state where a conventional compression coil spring is set on an assembly base.

FIG. 4 is an explanatory view in a case where a conventional compression coil spring is set on an assembly base, and then an assembly component is set from above.

FIG. 5 is an explanatory view of a state where the assembled component is pressed downward in the state of FIG. 4 and assembled.

FIG. 6 is an explanatory view showing a state in which the compression coil spring according to the embodiment of the present invention is set on an assembly base.

FIG. 7 is an explanatory diagram in a case where the compression coil spring according to the embodiment of the present invention is set on an assembly base, and then an assembly component is set from above.

FIG. 8 is an explanatory view of a state where the assembled component is pressed downward in the state of FIG. 7 and assembled.

FIG. 9 is a diagram showing a relationship between a width between windings of a compression coil spring according to an embodiment and a height of a tightly wound portion at a tip end;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Compression coil spring 30 Compression coil spring 31 Assembly base 41 Assembly parts

Claims (5)

[Claims] 1. A compression coil spring formed by spirally winding a wire, wherein a phase of a winding angle of the wire is shifted by 180 ° at both ends of the compression coil spring. 2. The compression coil spring according to claim 1, wherein both ends of the compression coil spring are closely wound. 3. When the total number of turns of the contact winding at both ends is an integer, the number of turns of the effective part is (integer + 0.5).
When the number of turns of the effective portion is an integer,
The compression coil spring according to claim 2, wherein the total number of turns of the close contact winding is (integer + 0.5) turns. 4. The contact height of the contact winding portions at both ends is:
3. The compression coil spring according to claim 2, wherein the distance between the windings of the compression coil spring when no load is applied is larger. 5. The compression coil spring according to claim 1, wherein the compression coil spring is used for automatic assembly.