JPH027320Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention A-1. Industrial Field of Use The present invention relates to a torsion coil spring having hook portions at both ends as a general and easy mechanical return means. .

A-2 Conventional technology and its problems Conventional coil springs with hooks formed at both ends, even though they are tension springs that are pushed and pulled along the axis of the coiled spring, tend to extend in the direction of the winding. Regardless of the torsion spring used for tension action,
It is simply a wire with both ends cut off and wound into a coil. According to this coil spring, when a high load is required and you want to reduce the difference between the maximum and minimum loads in the action range, the wire diameter of the coil spring is thicker, the number of turns increases, and the coil diameter becomes larger. This can make it difficult to install in restricted locations. As a countermeasure to this, coil springs are used in multiple pieces, but in this case, the number of parts increases, which increases the number of parts and the difficulty of assembling them, increases the cost, and also reduces the sliding of the working parts. The resistance part increases, and the difference in load (return characteristic) between the direction of action where the load increases and the direction of action where the load decreases increases.
It may cause harmful effects as a function. Furthermore, these conventional devices have the problem that since the spring material is wound in one piece, the spring material immediately loses its function due to damage to the wire material. In order to protect against loss of function due to damage in this case, a plurality of coil springs may be used, but they have the above-mentioned problems in their characteristics.

As another example of the prior art, a coil spring described in Japanese Utility Model Publication No. 42-10267 is well known. This spring has a diametrical continuation centering on both sides.
The spring body is formed by winding multiple times in a coil shape in the same direction with a phase difference of 180 degrees, which makes it difficult to obtain linearity in the relationship between load and deflection, as well as the effect caused by friction between close parts. There is also a problem in that it is difficult to obtain consistency in the load difference between directions. The reason for this is that during manufacturing, it is difficult to maintain a uniform state of formation for the two parts, which tends to cause differences in the degree of closeness or gap between the parts of the spring body, and the degree of closeness changes with changes in deflection. It is inevitable that the situation will change from close quarters to close quarters. Furthermore, this coil spring has the problem that when the continuous portion in the diametrical direction connecting the two portions is used as one hook portion, if this hook portion breaks, it immediately loses its function. ing. As yet another example of the prior art, it is known that two independent coil springs are stacked on top of each other, as in U.S. Patent No. 3,880,414. To prevent the relative positions of the two coil springs from shifting relative to each other or coming apart due to vibrations and external forces caused by the movement of the coil springs before the coil springs are assembled into mechanical equipment, etc., it is necessary to install two coil springs. The problem remains that additional parts such as a sleeve surrounding the spring and a shot clip that partially joins the two springs are required, resulting in high costs.

Therefore, the present invention is compact, has good return characteristics, does not instantly lose its spring characteristics, and is simple and does not require special additional parts to prevent the shape from deforming during movement until assembly. The object of the present invention is to provide a coil spring, especially a torsion spring, with a simple structure.

B. Structure of the invention B-1 Means for solving the problem As a means for achieving the above-mentioned object, the torsion spring of this invention is a torsion coil spring that is wound into a coil and has hook portions formed at both ends. , a linear body formed by bending one wire at the middle part thereof (hereinafter referred to as two parts) and bringing them into contact with each other in parallel from the bending base, and the bent side end of the linear body A common hook portion 2 is formed between the two portions, the wire body is wound in a coil shape so as to be connected to the hook portion 2 to form a spring body, and the other end of the wire body, i.e. It is characterized in that a hook portion 3 is formed at a portion where both ends of the one wire are brought into contact with each other in parallel.

B-2 Embodiment Next, the present invention will be explained based on an embodiment shown in the drawings.

In the embodiments shown in FIGS. 1 and 2, the coil portion of the spring 1 is formed by bending a single wire at its middle portion and winding two portions on both sides of the wire in parallel in parallel. One side 2 of the hook portions formed at both ends is formed by bending the one wire rod, and the other side 3 is cut open.

Next, a description will be given of an example in which the spring is attached to a throttle shaft shaft, which is a rotating part of a valve opening/closing mechanism shown in FIG. The flange 4 has an intake air passage 5 to the internal combustion engine, and a throttle shaft 6 rotatably perpendicular to the intake air passage 5. A throttle shaft 6 is installed in the intake air passage 5.
A butterfly valve 7 is fixedly attached to the valve with a screw or the like. A lever 8 is fixedly attached to the throttle shaft 6 by a nut 9 or the like, and the lever 8 receives an external force (force from an accelerator wire, etc., although not shown) to enable the throttle shaft 6 to rotate. The rotation of the intake air passage 5 changes the intake air passage area created between the intake air passage 5 and the butterfly valve 7, thereby changing the amount of intake air into the internal combustion engine.

On the other hand, in an internal combustion engine, if there is no external force,
The butterfly valve 7 is mounted so that the force of the spring 1 is biased in the closing direction. The spring 1 is attached coaxially to the throttle shaft 6, and the spring 1
A collar 10 is attached between the inside of the coil part and the throttle shaft 6 so as to be able to freely rotate with the outer circumference of the throttle shaft 6 and to reduce the sliding resistance between the spring 1 and the throttle shaft 6 during operation. It is being One end 2 of the hook portion of the spring 1 is connected to a spring stopper 1 fixedly formed on the flange 4.
1, and the other hook portion 3 is engaged with a portion of the lever 8, and is mounted so that the torsional moment of the spring 1 is applied in the direction in which the butterfly valve 7 is closed. FIG. 4 is a three-dimensional view of the parts around the throttle shaft 6.

In this way, when both end hooks of the spring are engaged and in the non-acting state, an external force greater than the return load of the spring 1 is applied to the lever 8 and the throttle shaft 6
, the throttle shaft 6 rotates to a predetermined angle against the force of the spring 1. When the external force is removed, the throttle shaft is similarly returned to its original state by the return load of the spring 1.

The relationship between the rotation angle and moment of the throttle shaft 6 during such an operation is explained using FIG. 5. The difference in moment between going and returning due to sliding resistance of the operating part When a plurality of conventional springs are used, the number of active parts increases, so the sliding resistance increases, resulting in the return characteristic shown by the dashed line, and the difference in moment becomes very large.

However, when the present invention is used, there is no addition of a sliding member and the spring force is only applied proportionally to the active portion, so that the return characteristic can reduce the moment difference as shown by the solid line.

C. Effect of the invention As described above, according to the invention, even when a high load is required as a spring characteristic, there is no need to increase the wire diameter or coil diameter of the spring, and furthermore, the length of the spring in close contact can be made extremely long. By simply forming two adjacent parallel windings made by simply bending one wire at the center and the hook part 2 that starts at one end, the spring properties are similar to that of a single linear wire. It can perform the same function as one using multiple springs, and does not require working parts such as a collar to satisfy the return characteristics of long-wound coils, and is wound in one piece. Therefore, as a spring that can be used under high loads without increasing the number of parts or assembly man-hours, its return characteristics are comparable to those of ordinary springs. , one wire is bent at the middle part, and the two parts on both sides are made into a linear body that is parallel and close to each other, so that the two parts forming the spring body have the same shape and each winding part In order to easily obtain uniformity of the gap between
This has the advantage that the total space between the winding portions can be reduced to reduce the space required for the entire spring body. Moreover, a common hook part 2 is formed at the bent side end, and the two parts of the wire rod connected to this hook part are wound adjacently in parallel, so even if one part is damaged, the other parts will still function. Therefore, the spring function is not completely lost, and furthermore, even when the spring itself resonates due to its own natural vibration, vibrations are damped by the slight contact between the two parts of the wire rod wound in parallel. In other words, a single piece of wire is bent at its middle part, and the two parts on both sides are wound in parallel next to each other so that the distance between the two parts can be stably reduced. As a result, when the two parts begin to move slightly, the two adjacent parts come into contact with each other and suppress the vibration. Further, it is possible to realize a torsion spring that has a simple structure, low cost, and safety in the event of breakage, without requiring any special additional parts to prevent the spring from deforming during movement until assembly.

[Brief explanation of the drawing]

Figures 1 to 4 show examples of this invention, respectively, where Figure 1 is a perspective view of a torsion spring, and Figure 2A is a perspective view of a torsion spring.
is the same side view, FIG. 2B is a view seen from the left of FIG. 2A, FIG. 3 is a cross-sectional view of the torsion spring of the present invention installed in an intake system for an internal combustion engine, and FIG. 4 is a view of FIG. 5 is a moment characteristic diagram of the torsion spring of the device shown in FIG. 4, FIG. 6A is a side view showing an example of a conventional spring, and FIG. 6B is a It is a view seen from the left of A. 1... Spring body, 2... Common hook part, 3...
...Futsuku Department.

Claims (1)

[Scope of utility model registration request] In a torsion coil spring that is wound into a coil and has hook parts formed at both ends, both wire rods (hereinafter referred to as two parts) formed by bending one wire rod at the middle part thereof are bent parallel to each other from the bent base. A hook part 2 shared by the two parts is formed at the bent side end of the linear body, and the linear body is connected to the hook part 2 to form a spring body. is wound into a coil shape, and a hook portion 3 is attached to the other end of the linear body, that is, the portion where both ends of the one wire are parallel to each other and in contact with each other.
A torsion spring characterized by being formed with.