JPH0554833U - Corrugated spring - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents wear of the pressure receiving surface of the compression load transmitting member (2) due to the first winding tip portions (1A) at both ends of the wave spring (1) being pressed under sliding contact. thing. [Structure] A tip end portion (1A) of a first winding at both ends of a corrugated spring (1) facing a pressure receiving surface of a compression load transmitting member (2),
The corrugated spring (1) is curved inward so as to extend toward the valley of the second winding at both ends, and the center (1
The tip end portions (1A) of the first winding at both ends of the corrugated spring (1) are positioned on the descending sloped surface separated from the C) by a predetermined distance.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a wave spring, and more particularly, to a device for preventing damage to a spring support structure due to sliding contact of a tip portion of a spring member.

[0002]

[Prior Art]

 BACKGROUND ART A clutch device or the like attached to an automobile engine incorporates a corrugated spring as a transmission structure for engine output, for example, a pressing biasing member for a clutch plate. Hereinafter, a general structure of the wave spring will be described with reference to FIG. The corrugated spring (1) is a coiling structure in which a plate-shaped steel material formed in a corrugated shape in the thickness direction is wound with a predetermined diameter in the width direction.

In the above-mentioned wave spring (1), a first winding on both ends of the wave spring (1) facing a member for transmitting a load (P), for example, a columnar support ring (2) having a groove for receiving a spring. Conventionally, since the corrugated spring (1) is formed into a closed type, as shown in FIGS. 4 (A) and 4 (B), the tip end portion (1A) of the first winding is the peak portion of the corrugation of the second winding ( 1B) was usually molded so as to be located above.

[0004]

[Problems to be solved by the device]

 When the compressive load (P) is repeatedly applied to the wave spring (1) having the above-described structure, a compressive stress is generated for each load of the compressive load (P). , Elastic deformation that balances the compressive load (P) occurs. The elastic deformation of the corrugated spring (1) is such that, at the tip end portion (1A) of the first winding wound in a spiral shape, a sliding contact pressure is applied to the spring receiving groove surface of the cylindrical support ring (2). Therefore, the tip end portion (1A) of the corrugated spring (1) is slidably pressed against the groove surface for spring reception each time the clutch device is actuated, and the abrasion is repeated each time. As a result, the cylindrical support ring (2) is worn in a relatively short period of time, causing malfunction such as malfunction of the clutch device. This not only lowers the durability of the clutch device but also hinders the safe driving of the vehicle, and there has been a strong demand for a solution to the above problem.

[0005]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, the present invention provides a corrugated spring in which a plate-shaped steel material formed in a corrugated shape in the thickness direction is spirally wound in the width direction. The corrugated spring is bent inward so as to extend toward the trough of the second winding of the corrugated spring, and its tip end is positioned on a slope having a downward slope that does not reach the center of the trough. A characteristic wave spring is provided.

[0006]

[Action]

 When designing the wave spring, the coiling structure facing the load transmitting member, that is, the tip of the first winding at both ends of the wave spring is extended inward so as to extend toward the valley of the second winding of the wave spring. The spiral winding pattern and dimensions of the spring material are set so that the tip end of the spring material is curved on the inclined surface of the downward slope that does not reach the center of the valley of the second winding.

When a compressive load is applied to the wavy spring, elastic deformation of the wavy spring causes the end portions of both ends of the first winding to be directed toward the second winding side, so that the tip portion of the first winding of the wavy spring is Prevents wear of the spring bearing support surface of the compression load transmission member due to sliding contact.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the following description, the same components as those in FIGS. 3 and 4 showing the conventional technique are denoted by the same reference numerals, and the description of the overlapping matters will be omitted.

FIG. 1 (A) shows a wave spring (1) in which both ends of the first winding in contact with the columnar support ring (2) are formed in a flat load receiving portion which is not wave-shaped, and FIG. 1 (B) shows 1 shows a wave spring (1) in which the first winding has a wave shape at a predetermined pitch. The corrugated spring (1) shown in FIGS. 1 (A) and 1 (B) is a thin plate of spring steel having a flat cross-sectional shape, formed into a wavy shape at a predetermined pitch along its length, It is formed into a compression spring by spirally winding in multiple directions.

In these wave springs (1), the first winding at both ends of the wave spring (1) facing the receiving groove surface of the columnar support ring (2) prepared as a member for transmitting the compressive load (P). The tip portion (1A) of the corrugated spring (1) is curved inward so as to extend toward the valley portion of the second winding of the corrugated spring (1), and the tip portion (1A) of the first winding of The tip is located on the slope of the descending slope before the predetermined distance (1) from the center (1C) of the valley of the second winding.

In designing the wave spring (1), by selecting the shape and dimensional specifications of the tip end portion (1A) of the first winding at both ends of the wave spring (1) as described above, the compressive load (P ), The direction of elastic deformation of the tip end portion (1A) of the first winding of the wave spring (1) is directed toward the second winding side of the wave spring (1). 3) The wear of the spring bearing support surface of the transmission member (2) due to the ends of the first winding (1A) at both ends is prevented. Further, the tip end portion (1A) of the first turn of the wave spring (1) is separated from the center (1C) of the valley part of the second turn of the wave spring (1) by a predetermined distance (1). Therefore, even if the tip portion (1A) moves forward due to the elastic deformation of the spring, it is possible to prevent the tip end portion of the tip portion (1A) from being balanced with the slope of the upward slope from the center (1C) of the second winding valley portion. .

FIG. 2 shows an additional embodiment of the present invention to reduce friction when the first winding tip portion (1A) slides against the second winding of the wave spring (1). In FIG. 2A, a chamfering process indicated by diagonal lines is applied to the most distal width portion of the first winding tip portion (1A). For the same purpose, in FIG. 2 (B), the tip portion (1A) is ground in a tapered shape in the thickness direction. The polishing allowance is maintained within the range of t / 4 to t / 2 (where t represents the thickness of the spring steel thin plate) over 1/2 pitch of the first winding. I am adjusting it to be done. Further, in FIG. 2C, the tip end portion of the first winding of the corrugated spring (1) that is in contact with the spring bearing side wall surface of the transmission member (2) of the load (P) is moved in the direction opposite to the spring bearing side wall surface by w. / 8 to w / 2 (where w represents the lateral width of the spring steel thin plate) and is curved in the width direction.

[0013]

[Effect of the device]

 By selecting the shape of the tip end portion (1A) of the first winding on both ends of the wave spring (1), when the compressive load (P) is applied to the wave spring (1), the tip end portion (1A) is The wear of the compression load transmission member (2) by the sliding contact pressing of (1A) and the valley portion (1C) of the second winding corrugation of the wave spring (1) is avoided, and the longevity of the clutch device is achieved.

[Brief description of drawings]

FIG. 1A is a partially enlarged side view showing a first specific example of both ends of a wave spring according to the present invention. (B) is a partially enlarged side view showing a second specific example of the wave spring according to the present invention.

FIG. 2A is a plan view of a first winding tip portion at both ends of a wave spring showing a first modification of the present invention. (B) is a side view of a first winding tip portion at both ends of the wave spring showing a second modification of the present invention. FIG. 6C is a plan view of the first winding tip portion at both ends of the corrugated spring showing a third modification of the present invention.

FIG. 3 is a side view showing a conventional example of a wave spring.

FIG. 4A is a partially enlarged side view showing a first conventional example of a first winding tip portion at both ends of a wave spring. FIG. 7B is a partially enlarged side view showing a second conventional example of the first winding tip portion at both ends of the wave spring.

[Explanation of symbols]

 1 Wave Spring 1A Tip of the first winding at both ends of the wave spring 1C Center of the valley of the second winding at both ends of the wave spring 2 Compressive load transmission member (cylindrical support ring)

Claims (1)

[Scope of utility model registration request] 1. A corrugated spring in which a plate-shaped steel material formed in a corrugated shape in a thickness direction is spirally wound in a width direction, wherein a tip end portion of a first winding at both ends of the corrugated spring is a second portion of the corrugated spring. A corrugated spring, characterized in that it is curved inward so as to extend toward a trough of a winding corrugation, and its tip end is located on an inclined surface having a downward slope that does not reach the center of the trough.