JPH0217241A - Metallic belt with teeth for power transmission - Google Patents

Abstract

PURPOSE:To aim at the prolongation of the life of a belt by laying an endless circular tooth-formed hoop formed like a tooth at a constant pitch continuously on the inner circumference of a core hoop made by the piles of endless metallic flexible thin rings and nipping them every pitch from outside by an application member having an application hole for fitting tooth formed one. CONSTITUTION:A core hoop 2 is formed by piling endless metallic flexible thin rings 2. An endless circular tooth-like hoop 5 at which the form of a tooth is formed at a constant pitch is piled on the inner circumference of the core hoop 2. A holding body 6 formed by flexible material flat and cylindrically at which an application hole for fitting the form of the tooth 3 at the central portion are arranged every one pitch to hold the core hoop 2 and the tooth-like hoop 5 to be tightly wound by a bent edge 8. Under this construction, stress load of the respective portion of the belt is distributed so that the life of the belt is lengthened.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to improvements in toothed transmission belts used for purposes such as power transmission and timing of machine operation in industrial machinery, automobiles, etc. .

(Prior art) A toothed belt made of rubber or synthetic resin and having teeth arranged at a constant pitch on one or both sides of the belt body is well known, and the winding is used as a transmission belt. It is also known to bury steel wire, glass fiber, synthetic resin fiber, etc. as a reinforcing material in the neutral part of the interior, and this is widely used as a so-called timing belt. However, this type of conduction belt is It is well known that there are problems such as large elongation, often causing tooth skipping, contact noise between the pulley and the other pulley, and durability deterioration due to adhesion of oil, water, etc. In order to solve this problem, a method of using a metal strip for such a toothed belt has been proposed.One example of this is disclosed in Japanese Patent Application Laid-open No. 14061/1983, and the details can be found in the same publication. As stated, rubber,
A tooth-shaped protrusion is integrally formed on one or both sides of a belt body made of synthetic resin or the like and has a rectangular cross section, and an endless metal strip having the same width as the belt body is attached to one flat surface or tooth-shaped part of the base body. Both are integrally bonded to the other surface having the protrusion or within the neutral portion of the belt body.

(Problem B to be solved by the invention) In a transmission belt that uses the above-mentioned metal band plate, the belt has a thickness relative to the neutral part, and power is transmitted from the other pulley around which it is wrapped to the toothed part of the belt. When the belt is used, a large force is applied to the root of the tooth shape, and the force decreases as it moves toward the outer periphery of the belt body. There still remains a problem in terms of peeling.

In order to contribute to solving the above-mentioned problems, the present inventors have proposed that by fitting both an endless metal annular band having teeth and an endless metal flexible ribbon having no teeth, the teeth can be connected to the teeth. We have proposed a conductive belt that does not cause peeling of the belt body, is lightweight, strong, and has improved durability. Specifically, as shown in FIG. Core material tool 15 consisting of one or more core materials
This is a transmission belt 56 in which an endless annular toothed hoop 55 formed into a continuous toothed shape 53 with a fixed pinch is fitted on the inner circumferential surface or the outer circumferential surface or both of them. According to this, both hoops 52 and 55 are not completely fixed but slip between them, eliminating problems such as separation between the teeth and the main body of the bell 1, and the tooth-shaped hoop 55 is secured by the core material hoop 52. This has been improved so that the shape is maintained so that it does not interfere with power transmission. However, this conduction belt 56 still has the following problem in that the burden on the material becomes too large. That is, as shown in FIG. 4, when this transmission belt 56 is wound between a driving pulley 57 and a driven pulley 58 and circulated in the direction shown by the arrow in the figure to transmit power (the tensioner is omitted),
The side A in the figure is the tension side of the belt, and the side B in the figure is the slack side. Torque transmission is obtained by the tension of the belt on this tension side A. However, if the belt has low tensile strength against this tensile force, it will break or stretch, and even if the belt has high strength, it will stretch within its elastic limit. ,
In the one shown in FIG. 4, each tooth profile 53 is unrestricted, so even if a strong material is used, it is difficult to completely prevent elastic deformation. When the thickness of the tooth-shaped hoop 55 is increased, the bending stress when wrapped around the pulley increases. In addition, on the loose side B, as shown in FIGS. 5(a) and 5(b), which show the deformation (elongation and contraction) of each tooth profile 53 on the tight side A and loose side B, the elongation of the tooth profile 53 portion of the belt on the tight side A is shown. but,
As the drive pulley 7 rotates, the slack IB is fed one after another, and this elongation must be absorbed by the contraction and deformation of the tooth profile 3. This repetition of such expansion and contraction requires a large bearing capacity on the material surface. This creates a new problem in terms of the durability of the belt itself.

(Means for Solving the Problems) The present invention solves the problems in the composite belt structure of the core material hoop and the toothed hoop by integrating both hoops. Specifically, One or more endless metal flexible ribbon rings are stacked to form a core material hoop, and an endless annular ring shaped into a continuous tooth shape at a constant pitch is formed on the inner circumferential surface or outer circumferential surface of the cough core material hoop, or both. The toothed hoops are fitted in an overlapping manner, and a locking hole into which one of the teeth of the toothed hoop is fitted in a protruding manner is formed in the center of one longitudinal surface of the flat cylindrical holding body. A clip-shaped stopper whose total length in the longitudinal direction corresponds to the length of one pitch of the constant pitch in the toothed hoop is attached over the entire circumference of the fitted hoops and at each toothed position. The purpose is to fit and integrate the stopper into the tooth-shaped stopper locking hole and to fit it externally into both hoops from the thickness direction of both hoops.

(Function) According to the above-mentioned technical means of the present invention, in FIGS. 1, 2 and 3, one or more endless metal flexible ribbon rings 1 are polymerized. When the core hoop 2 is turned, an endless annular tooth shape hoop 5 is formed on the inner circumference side with a tooth shape 3 having a desired cross-sectional shape in a fixed pinch, and each tooth shape 3 is used as the core material hoop 2. The teeth 3 fit into the central part of one longitudinal surface 6a of the clamping main body 6, which is separately formed into a flat cylindrical shape from a flexible material. Locking hole 7 to be inserted
The other surface 6b corresponding to the one surface 6a has bent edges 8, 8 that can be bent in the width direction, and the total length in the longitudinal direction of the clamped living body 6 is a tooth-shaped hoop, as shown in FIG. A large number of clip-shaped stoppers 9 each having a length corresponding to one pitch length of the fixed pitch in 5 are provided, and each stopper 9 is fitted into its locking hole 7 with the tooth profile 3 protruding, thereby forming the tooth profile. The bent edges 8, 8 are attached to the hoop 5 side and bent in the thickness direction of the tooth-shaped hoop 5 and the core material hoop 2.
By winding it tightly around the core material hoop 2 side, both hoops 2.5 are fixed and integrated over the entire circumference of the hoop by the respective stoppers 9 arranged next to each other, and the total length corresponding to l pitch L is The fasteners 9 are arranged continuously in parallel along the entire circumferential direction of the composite belt formed by the two hooves 12 and 5, and do not impede the flexibility of the belt as a whole. Therefore, as previously explained in FIG. 4, the belt of the present invention is wound between the driving pulley 57 and the driven pulley 58, each having a tooth profile peripheral surface that meshes with the tooth profile 3, and is driven under appropriate tension by a tensioner. In order to transmit power, the belt is stretched due to tension during winding and rotation, and the tooth profile tooth 15 alone cannot maintain a predetermined tooth profile because the belt stretches. Therefore, the tension applied to the hoop 5 is reduced as much as possible by separating it from the toothed hoop 5, and the expansion and contraction deformation of each toothed shape 3 caused by the separation of both 2 and 5 is suitably and effectively prevented by the clip-shaped stopper 9. It prevents them from doing so. That is, the stopper 9 has a locking hole that holds and restrains the tooth profile 3, and reliably prevents expansion and contraction deformation of the tooth profile 3 that occurs in accordance with the elongation and contraction of the belt. Since the belt does not stretch at the rear of the rotation of the gear, the change in length is small, but since no tension is applied to this part, it tends to loosen, and the tendency of the stopper 9 to rise from the core material hoop 2 is reduced. This is reliably prevented by clamping, and the stopper 9 also prevents lateral displacement in the width direction between the core hoop 2 and the toothed hoop 5. Moreover, in the present invention, the clip-shaped stopper 9
Since the total length in the longitudinal direction of the tooth profile tool 15 is set to be equivalent to the length of one constant pitch of the tooth profile tool 15, the second
As shown in the figure, the respective stops are arranged in a continuous manner close to each other, and power (torque) can be transmitted by pressing the fasteners 9 together.
On the belt slack side B illustrated in the figure, the stopper 9 is sent out from the tension side A, so it has the function of realizing power (torque) transmission by the pushing force of the stoppers 9. Moreover, this also distributes the stress among the various parts of the entire belt, which helps extend the belt's lifespan.

(Example) A suitable example of the belt of the present invention will be described with reference to FIGS. 1 to 3.

In the embodiment shown in each figure, tooth profiles 3 are formed at a constant pitch on the inner surface of a core material hoop 2 made of one endless metal flexible ribbon l, and the open ends of each tooth base side of the tooth profiles 3 are connected together. Although the core material hoop 2 is formed into an annular shape in the example shown, one or more endless metal flexible thin strips 1 may be polymerized, depending on the scale and purpose of the belt. The number is free. This core material hoop 2 is used to maintain the shape of the tooth profile tool 15, and its inner and outer surfaces are both flat. Further, the cross-sectional shape of the tooth profile 3 in the tooth profile hoop 5 can be any cross-sectional shape, and in the illustrated embodiment, the tooth profile 3 is approximately trapezoidal, and tooth profile irregularities are alternately formed on the inner and outer circumferential surfaces. This time both hoops 2,
5. When fitting, the fitting is forcibly fitted without any difference in circumferential length, or is an interference fit.

Furthermore, when fitting the toothed hoop 5 to the outer surface of the core hoop 2, each toothed hoop 5.5 is fitted to the inner and outer surfaces of the core hoop 2.
The present invention also includes the case where the two are fitted together. In either case, the connecting portions 4 of the toothed hoop 5 are tightly pressed against the inner and outer surfaces of the core hoop 2. Furthermore, in the present invention, the core material hoop 2 and the toothed hoop 5, which are fitted in a superposed manner as described above, are fixed together at each toothed shape 3 position in the toothed hoop 5 using a clip-like stopper 9. It is something that has. As shown in FIG. 2.3, the stopper 9 has a toothed tool 1 at the center of one surface 6a in the longitudinal direction of the clamping main body 6 formed in a flat cylindrical shape.
5, a rectangular locking hole 7 is opened that matches the rectangular cross-sectional shape of the root side of the trapezoidal tooth profile 3, so that the tooth profile 3 has a protruding shape in the locking hole 7. The tooth shape is secured by being inserted into the tooth shape and restrained by the four sides of the rectangle, preventing free deformation.

One surface 6a of the holding main body 6 and the other surface 6b in the opposite longitudinal direction are formed into bent edges 8.8 that can be bent in the width direction as shown in the figure.

What is also important is that the total length of the holding main body 6 in the longitudinal direction is set to a length corresponding to the length of one pitch of the toothed hoop 5 at a constant pitch. Therefore, in the clip-shaped stopper 9 having such a structure, one tooth profile 3 of the tooth-shaped hoop 5 is fitted into the locking hole 7 formed on one surface 6a in a protruding manner, and the other surface 6b is formed. By bending the bent edges 8, 8 to the upper surface side of the core material hoop 2 in a tight shape, both hoops 2.5 and the stopper 9 can be integrated, and in this case, Since the entire length of the clamping main body 6, that is, the stopper 9, is set to be a length corresponding to one pinch length of the constant pitch in the toothed hoop 5,
Both ends in the longitudinal direction of the stoppers 9 attached to each adjacent tooth profile 3 stop at the center position of each joint portion 2 that is in pressure contact with the core material hoop 2, and extend over the entire circumference of both hoops. Each stopper 9 will be juxtaposed closely as shown in the second figure.

In this case, there is no need to increase the clamping force of the clip-shaped stopper 9 on the core material hoop 2 and tooth-shaped hoop 5.
It is sufficient that the core material hoop 2 and the toothed hoop 5 are strong enough to freely slide at different rotational speeds, and the material of the stopper 9 is not particularly limited, but since it rotates integrally with the toothed hoop 5. , since it slides on the surface of the core material hoop 2,
It is desirable to use an appropriate material such as metal or synthetic resin that does not damage the hoop 2. In addition, frictional force due to the difference in circumferential speed acts on the contact area between the core material hoop 2 and the toothed hoop 5, causing wear and heat generation. It is appropriate to apply a surface coating treatment or the like.

(Effects of the Invention) According to the toothed metal belt of the present invention, the problem of tooth shape deformation in the composite belt of the fitting type between the core material hoop 52 and the tooth shape hoop 53, which was previously explained in FIG. 4, is solved, Excellent in improving belt life and ensuring torque transmission.

That is, in the present invention, one tooth profile 3 in the tooth profile hoop 5 is fitted into the tooth profile hoop 5 in a protruding manner, and has a locking hole 7 for restraining its deformation, and has a total length corresponding to the l pitch length in the tooth profile hoop 5. The tooth profile 3 is fixed by integrally fixing both hoops 2 and 5 using a chestnut-shaped stopper 9.
Not only is the expansion and contraction deformation strongly prevented in both the circumferential direction and the belt width direction, but also the core material hoop 2
More reliable synchronous transmission can be obtained without the tooth-shaped hoop 5 lifting up. Furthermore, by arranging the stops 9 in parallel over the entire circumference of the belt, torque transmission can also be achieved by the force of the stops 9 pushing against each other, so large torque transmission is also guaranteed. According to this, there is no need to increase the thickness of the tooth-shaped hoop 5, without impairing the characteristics of the lightweight belt, and from a structural standpoint, the overlapping arrangement of the stoppers 9 can also improve the strength of the entire belt. Since the effect of dispersing the stress burden on each part of the belt also occurs, the belt life can be further extended.

[Brief explanation of the drawing]

Figure 1 is a front view of the main parts of an embodiment of the belt of the present invention, Figure 2 is a slope view of the main parts, Figure 3 is an exploded slope view of each component of the belt, and Figure 4 is a conventional core material hoop and tooth profile. A front view of an example of a belt with hoops (FIG. 5(a)) is a diagram showing the deformation of each tooth profile on the tight side and the loose side. 2-core material hoop, 3--toothed hoop, 4--joint portion, 5-toothed hoop, 6--clamping main body, 7--locking hole, 9--clip-like stopper. Patent applicant: Kobe Seimei Co., Ltd.
Toshio Yasuda, patent attorney, ■゛top. Figure 4

Claims (1)

[Claims] (1) One or more endless metal flexible ribbon rings are stacked to form a core hoop, and the inner circumferential surface, outer circumferential surface, or both of the core hoop is formed into a continuous tooth shape at a constant pitch. Endless annular tooth-shaped hoops are fitted in an overlapping manner, and a locking hole into which one of the teeth of the tooth-shaped hoop is fitted in a protruding manner is provided in the center of one longitudinal surface of the flat cylindrical holding body. A clip-shaped stopper whose total length in the longitudinal direction of the clamping body corresponds to the length of one fixed pitch in the toothed hoop is provided over the entire circumference of the fitted hoops and at each toothed position. 1. A toothed metal belt for power transmission, characterized in that the toothed metal belt is integrally fitted onto both hoops from the thickness direction of the hoops in a manner such that the hoops are fitted into a tooth-shaped stopper locking hole.