JPS60104832A - Multiple coupling type driving belt - Google Patents

Abstract

PURPOSE:To reduce the generation of vibration and noise, by a method wherein synthetic elasticity distribution on the whole multiple belt is approximately uniformized. CONSTITUTION:A range having high elasticity is displaced from a range having low elasticity so that they are prevented from aligning in a phase manner with each other between multiply belts, and synthetic elasticity distribution is about uniform throughout the whole periphery of the belt. Namely, a relation position between the belts is decided so that a maximum elasticity spot and a minimum elasticity spot are positioned in alignment with each other in a phase manner between elasticity distributions I and II being inherent to each belt. This enables control of twist vibration generated at a belt driving system and caused by uneven elasticity distribution of the belt and the secondary generation of vibration and noise.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to a multi-connected trapezoidal power transmission belt for general industrial use, which transmits power by passing a frame between a prime mover and a pulley on a driven machine side.

[Prior art and its problems]

First, FIG. 1 shows a basic belt transmission mechanism. In the figure, 2 is the driving pulley, 2 is the driven pulley, and 3 is the belt wrapped between pulleys 1 and 2. During operation, the upper side of the belt is the tension side and the lower side is the slack side, and the surface of the belt and pulley is It is well known that power is transmitted by the frictional force between the two. Furthermore, in general industrial machinery where the transmitted power is relatively large, multiple belts are usually used, and in the case of brackets, V-belts with less slippage and high transmission efficiency are widely used. By the way, when the belt transmission ma is in operation, vibrations are observed in the belt transmission mechanism, and especially if a gear device or the like is also incorporated in the power transmission system, vibration noise may become strong. In addition, this vibration noise may sometimes turn into a buzzing sound, giving a sense of anxiety to operation and maintenance personnel. According to the inventor's study of the mechanism by which such noise is generated, the cause is that the tensile elasticity of each belt is not uniform over the entire length of the belt, as detailed below. It turned out that That is, using a commercially available belt as a sample, the following tests were conducted to determine the tensile elasticity distribution over its entire length. First, as shown in FIG. 2, one belt 3 is divided into 16 equal parts, and each position is marked with a number from ■ to [phase] to serve as gauge points. Furthermore, at equal intervals from a point away from the gauge point ■ by a distance corresponding to the distance β between the axes of pulleys 1 and 2,
Place the heald 3 between the pulleys 1 and 2 as shown in Figure 1, and while applying force P to the pulleys 1 and 2 and tensioning the belt 3, pull the pulley from the drive side. Rotate. Here, when the belt gauge mark ■ reaches point X shown in Figure 1, measure the belt length between the gauge mark ■ and ■° and find out the belt elongation △! From this measured value, the average tensile elasticity C-Δβ/P between the gauge points ■ and ■° is calculated. By carrying out similar operation 4 for each of the gauge points 1 to [phase], the tensile elasticity distribution shown in FIG. 3 is obtained. As is clear from Figure 3, the tensile elasticity of the belt is not uniform over its entire length (
There are regions of high elasticity and regions of low elasticity. Although the degree of this tendency varies, it has been confirmed from the test results conducted by the inventor that each commercially available belt exhibits its own unique elasticity distribution. The reason for this is presumed to be the following. That is, the manufacturing method of the V-belt mentioned above is as shown in FIGS. 4 to 6. First, a wide unvulcanized rubber 5 for the base is wrapped around the drum 4, and then the unvulcanized rubber 5 for the base layer is roughly wrapped. Rubber 6 for reinforcement of bending rigidity is wrapped around. Next, the core wire cord 7 is continuously wound in a spiral shape with narrow pinch intervals and then vulcanized. Next, the V-belt 3 is completed by cutting it into pieces with a fixed width along the broken line shown in FIG. 5, and finally wrapping the cloth 8 around the circumferential surface. In this way, the product of the belt 3 with core wire cords made by cutting a wide belt into rings has a large number of spirally wound cords 7 in some places and a few places in other places depending on the location along the circumferential direction. Yes, and this cord is interrupted at some point along its length. Naturally, seams also exist because the rubber band is wrapped in the manufacturing process. Furthermore, since the core cord 7 shares a considerable proportion of the tension acting on the belt, as a result, regions of high tensile elasticity and regions of low tensile elasticity are formed along the circumferential direction of the belt 3. By the way, in the bell 1-transmission mechanism shown in FIG. 1, the torque TI transmitted between the pulleys 1 and 2 by the belt 3
, T2 are well-known to be expressed by the following equations. TI = R1 (Fl - F2 ) T2 = R2 (Fl - F2 ) Note that Fl and F2 are belt tensions on the tight side and slack side, respectively, and R1 and R2 are the radii of pulleys I and 2. On the other hand, with respect to the entire length of the belt 3 shown in FIGS. 1 and 2, the region of average elasticity of the region of length β is designated as A, and the region of high elasticity is designated as B, respectively. Let the elasticities of region B be C1 and C2. Note that when no tension is applied to the belt, the lengths of areas A and B are both l.
As can be seen from the measurement results in FIG. 3, the A and B areas of one heald are generally located on opposite sides of the belt. Here, when the belt 3 is passed over the pulleys 1 and 2 and rotated while applying tension to the belt 3 by applying force P at the same time as described above, when the A area and B area respectively come to the tension side of the heald. The elongation Δp of the belt becomes FI C1 and FIG G2 with respect to the heald length l, and this state is illustrated in FIGS. 7 and 8. On the other hand, when area A and area B come to the slack side of the belt, each elongation Δl of the heald is FI with respect to the heald length l.
CI, F2 C,2. From this, belt 3
The amount of elongation of the belt is determined by the state in which the A region with low elasticity is on the tension side and the B SJi region with high elasticity on the slack side, and the state where the B region is on the tension side of the belt and the A region on the slack side. △β
changes, and the difference in the extension of the heald, that is, the 9th
The angle Δθ (radian) in the figure is expressed by the following formula. △θ-((FICI-F2C2) -(FIC2-F2
CI) l /R2-(CI-C2) (Fl +F
2) When the difference in /R2, that is, the elasticity CI of the A and B regions, and C2 is large, Δθ becomes large, and a change corresponding to this elongation occurs repeatedly in the revolution period. Note that the revolution period of the belt is expressed as L/v, where V is the circumferential speed of the belt and L is the total length of the belt. As a result, when the belt transmission mechanism is in operation, torsional vibration with an amplitude of 603 frequency v/L as shown in Fig. 1θ occurs on the shaft on the driven side. The vibration frequency in this case is - for example, belt length 1.
Calculating a belt transmission mechanism with a pulley diameter of 5 m and a pulley diameter of 150 mm, the rotational speed is 200 Or, p, m.
So 10.511z, 4000r, p, m is 21H
It becomes z. As mentioned above, when vibration occurs due to the difference in belt elongation during operation, the natural frequency of the rotating shaft, gears, etc. that make up the transmission mechanism is the excitation frequency generated from the heald mentioned above. If they match, the resonance effect will result in large torsional vibrations, which will generate large noises, especially if there is a gear system. Furthermore, if the natural bending frequency of the rotary shaft of the pulley and the excitation frequency match and resonate, there is a risk of increased vibration and damage to the shaft. Now, the above description has been made regarding the case where there is only one belt, but in the case of a multi-belt in which multiple belts are wound in parallel as in an actual transmission device, the state of vibration becomes even more complicated. In other words, if two belts are passed parallel to each other on a pulley, the elastic distribution of each belt will be as shown in Fig. 11 or 12 depending on the relative positions of the two healds. (a) and (b) in the diagram
become that way. Among these, in the case of Fig. 11, the elasticities (a) and (b) of each belt are superimposed topologically, resulting in the composite elasticity of the two belts (c), and the maximum and minimum elasticity values are The difference between the values becomes larger. On the other hand, in the case of Figure 12, the elasticity distributions (a) and (b) cancel each other out topologically, so the composite elasticity is as shown in (c), and the difference between the maximum and minimum elasticity values becomes small. , averaged over the entire length. on the other hand,
As is well known, belts suffer from creep that occurs during operation.
It moves while slipping locally between the pulleys,
In this case, since the amount of slip varies depending on the individual heald, the relative position of each belt in the circumferential direction changes over time during actual operation, and the states shown in Figures 11 and 12 occur alternately and repeatedly. Become. As a result, torsional vibration whose amplitude changes with time occurs on the driven pulley shaft as shown in FIG. 13. Furthermore, as the number of belts used increases, more and more complex and irregular torsional vibrations occur, and the resulting vibration noise becomes a whirring noise, which gives a sense of anxiety to machine maintenance personnel.

[Purpose of the invention]

This invention was developed in view of the above points, and is designed to reduce the excitation force generated in multiple belts due to the uneven tensile elasticity distribution unique to each belt, which is unavoidable due to the heald manufacturing method as described above. It is an object of the present invention to provide a multi-connected trapezoidal power transmission heald which can be skillfully suppressed.

[Key points of the invention]

In order to achieve the above object, the present invention actually measures the tensile elasticity distribution over the entire length of each belt using the method described in FIGS. By shifting the positions of large and small elastic regions in each of the constituent belts in the circumferential direction so as to offset each other, the composite elasticity distribution of the entire multi-belt can be made almost uniform over the entire length. The relative positions of the belts are set so that the belts are aligned with each other, and the belts are integrally connected to each other through the connecting means while maintaining this relative position, thereby reducing torsional vibration of the shaft that occurs during operation and It is designed to reduce vibration and noise in people's homes.

[Embodiments of the invention]

The configuration and assembly procedure of the present invention will be described below based on the illustrated embodiments. In order to assemble the multi-connected metal transmission heald according to the present invention, first, the tensile elasticity distribution over the entire length of each belt constituting the multi-connected belt is actually measured. Although the principle of this method was previously described in FIGS. 1 to 3, it is actually measured using a stroboscope-type measuring device as shown in FIG. 14 as an example. In the figure, 9 is a drive motor, 10 is a flywheel as a driven load, 11 is a pink-up for detecting rotational speed or torque, 12 is a measuring device, 13 is an indicator thereof, and 14 is a strobe. A reference belt 15 whose elastic distribution is known in advance is stretched between the pulleys 1 and 2, and a strobe reference mark 15a is attached at a predetermined position on the belt. At this point, mark marks 3a are placed on the heald 3 to be inspected at multiple locations as described above with chalk, etc., and the reference belt 15 is placed one by one.
The frame is passed to the pulleys 1 and 2 in parallel, and the motor 9 is operated. In this case, when the elastic distributions of the reference belt 15 and the belt 3 to be inspected match in phase as shown in FIG.
Large speed fluctuations or torque fluctuations that change with the period of the revolution frequency of the belt appear on the indicator 13. On the other hand, when the elastic distributions are shifted so as to offset each other phasewise as shown in FIG. 12, the indication of the indicator 13 becomes minimum. At this time, the light source of the stroboscope is made to flicker in synchronization with the revolution speed of the heald, and the relative position of the reference mark 15a of the belt 15 and the mark 3a of the heald 3 to be inspected is detected. The elasticity distribution of the belt 3 to be inspected is determined based on the elasticity distribution of -15 as a reference and in comparison with this.In addition, for the belt assembly work described later, instruction marks indicating the positions of the maximum and minimum elasticity points are drawn. Mark it on the belt.In addition to the above-mentioned stroboscope method, there is also a method of measuring the tensile elasticity distribution of the belt to be inspected using a rotary encoder method.Next, the individual The following describes the procedure for assembling and configuring a multi-connected trapezoidal power transmission heald using belts.First, line up a predetermined number of belts, and using the instruction marks marked in the above process for each belt to indicate areas of high elasticity and areas of low elasticity, Belt 1 is offset in the circumferential direction so that each region does not match in phase between the multiple belts, and the composite elasticity distribution of each belt as a multiple belt is approximately equal over the entire circumference of the belt. -Determine the relative position between each other.In this case, if the multi-belt is composed of two belts, as shown in Figure 15, the point of maximum elasticity between I and ■, which is unique to each belt. The relative positions of the belts are determined so that the minimum point and the minimum point are aligned topologically.As a result, the composite elasticity distribution of the two belts becomes uniform over the entire length as shown by T.Similarly, When a multi-belt consists of three healds, as shown in Fig. 16, the elasticity distribution of each belt is determined so that the composite distribution T of Il and III is uniform over the entire length of the belt. The relative positions of the belts are set by rearranging the belts.In other words, the relative positions of the belts using the above method are determined in the same manner as the vector composition drawing method.Therefore, the individual elastic distributions of the three belts and their elastic values are Even if the elasticity distribution is uneven, by performing proper relative positioning using the method described above, the composite elasticity distribution of the multiple belt can be made almost uniform over the entire area. Once the relative position of each belt in the multi-belt is determined so that the elastic distribution is uniform,
Next, while maintaining this relative position, each of the belts constituting the multi-connection 1-1 is mechanically connected integrally with each other via a connecting means, thereby assembling and constructing a multi-connection trapezoidal power transmission belt. become. Next, several examples of connecting means for integrally connecting multiple belts while maintaining their relative positions are described in the first section.
This is shown in Figures 7 to 20. In each cycle, 3I to 3■ are three belts constituting a multiple belt whose relative positions in the circumferential direction are determined through a complete elastic distribution equalization process. In order to maintain the relative positions of the belts 3I to 3■ and to integrally connect the respective belts, in the embodiment shown in FIG. A wide pack band 16 is attached to the side, and the three healds are integrally connected via this bank pan 16. It is also possible to stack unvulcanized bank bands 16 on each belt and vulcanize them to integrate them. In the embodiment shown in FIG. 18, a tooth row 1 is provided in advance along the longitudinal direction on the back surface of each belt 31 to 3 as a connecting means.
7, and with the relative positions between the belts determined, a wide toothed bank band 18 is attached to each belt 3I~
The bells 31 to 3 are integrally connected to each other by being engaged with each other across the tooth rows 17 of the bells 3 and 3. In this embodiment, the healds can be replaced or rearranged one by one, and as mentioned earlier, indication marks are placed on the circumference of the belt to indicate the maximum elasticity points and the minimum elasticity points based on the elasticity distribution measurement results. By keeping these marks in mind, it is also possible to assemble or replace the multi-connected trapezoidal power transmission belt at the site of use, relying on this mark. In the embodiment shown in FIG. 19, a row of teeth 1 is provided in advance on each of the belts 31 to 3 as a connecting means, protruding on both the left and right sides.
7 is formed, and after setting the relative position between the healds, the tooth rows 17 are meshed with each other to be integrally connected,
In this embodiment, as in the embodiment shown in FIG. 18, the multi-connected trapezoidal power transmission belt can be assembled or replaced at the place of use. In the embodiment shown in FIG. 20, a large number of screw holes 19 are drilled along the longitudinal direction on the back surface of each belt 31 to 3. Connecting pieces 20 are fastened to a plurality of locations on the top to be integrally connected. As in each of the above embodiments, after performing an operation to equalize the elasticity distribution of a multi-belt that combines multiple healds, each belt is connected to each other by a connecting means while maintaining the relative position between the belts. Since they are integrally connected, each of the healds 31 to 3 will not slip separately between them and the pulley during operation, and therefore, an evenly distributed state of composite elasticity will always be maintained as a multiple belt.

[Effects of the Invention] As described above, the present invention actually measures the tensile elasticity distribution over the entire length of each of the plurality of belts constituting the multiple belt, and based on this, when assembling and configuring the multiple belt. By relatively deviating the large and small elastic areas of each belt in the circumferential direction, the positioning is set so that the synthetic tensile elasticity distribution as a multiple heddle is almost equalized over the entire length. The multi-connected trapezoidal power transmission belt is constructed by integrally connecting each belt to each other by a connecting means while maintaining this relative position. Therefore, due to the manufacturing method of the belt, the inherent unevenness of each heddle is unavoidable. It is possible to obtain a multi-connected trapezoidal power transmission belt with an even tensile elasticity distribution by compensating for each other's tensile elasticities. This provides an excellent effect of suppressing the vibration noise derived from the vibration.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle configuration of the belt transmission mechanism, Fig. 2 is a developed view of the belt, Fig. 3 is a tensile elasticity distribution diagram of the belt in Fig. 2, and Figs. 4 to 6 are V-belts with core cords. A cord winding state diagram shown in the order of the manufacturing process, a partial Ijji side view of the intermediate finished product, and a perspective sectional view of the completed belt, No. 7
Figures 9 to 9 are explanatory diagrams showing changes in elongation of the belt during operation, Figure 10 is a waveform diagram of torsional vibration applied to the driven shaft during operation with one belt, and Figures 11 and 12 are Figure 13 is a diagram of the tensile elasticity distribution at different relative positions of the double belt, Figure 13 is a waveform diagram of torsional vibration applied to the driven shaft during operation with the double belt, Figure 14 is
The figure is a configuration diagram of a stroboscope-type tensile elasticity distribution measuring device, and Figures 15 and 16 are explanatory diagrams showing the relative positioning procedure between belts according to the present invention for double belts and triple belts, respectively. , Figures 17 to 2
FIG. 0 is a perspective sectional view of different embodiments showing the structure of communication means between belts according to the present invention. 1.2-pulley, 3,31~3nt-g-belt, 7-
Core wire cord, 16-bank band, 17-dentition, 18
-・Toothed back band, 20 pieces. Kuzutsu・shi,i91J〉 1st figure 2nd figure Heitei No. 3rd figure 5.6 4th figure 5th figure 8 10th figure 11th figure off 2nd figure 13th figure 715 Figure 18

Claims (1)

[Claims] 1) A multi-connected trapezoidal power transmission belt formed by connecting a plurality of belts in parallel and integrally with each other, which is based on the tensile elasticity distribution over the entire length of the heald determined by actual measurements for each belt. In addition, by shifting the positions of the regions of large and small tensile elasticity in each belt relative to each other in the circumferential direction, the synthetic tensile elasticity distribution as a multiple belt becomes almost uniform over the entire length. A multi-connected trapezoidal power transmission belt characterized in that the relative positions of each belt are determined as follows, and the belts are integrally connected to each other via a connecting means while maintaining this relative position. 2. A multi-connected trapezoidal power transmission belt according to claim 1, wherein each belt is a core corded belt. 3) The belt according to claim 1, characterized in that on the circumference of each belt, indicator marks indicating the maximum and minimum points of tensile elasticity determined by actual measurement of the tensile elasticity distribution are marked. A multi-connected trapezoidal transmission belt. 4) In the belt according to claim 1, a wide back band is attached to the entire circumference across the back side of each belt as a connecting means, and each belt is integrally connected to each other via this bank band. A multi-connected trapezoidal power transmission belt characterized by: 5) In the belt according to claim 1, each belt is provided with a row of teeth protruding from the back side as a connecting means, and a bank band with a row of teeth is engaged over the entire circumference of each belt. A multi-connected trapezoidal power transmission belt characterized in that each belt is integrally connected to each other via the hack band. 6) In the heddle according to claim 1, a row of teeth protruding from both sides of each belt is formed as a connecting means,
A multi-connected trapezoidal power transmission belt characterized in that each belt is integrally connected to each other by meshing the tooth rows. 7) The belt according to claim 1, characterized in that connecting pieces are fixed across the belts at a plurality of locations on the belt, and the belts are integrally connected to each other via the connecting pieces. A multi-connected trapezoidal transmission belt.