JPH0769002B2 - Transmission belt inspection method and device - Google Patents

Description

The present invention relates to a method and an apparatus for inspecting a transmission belt.

(B) Prior art A chain type transmission belt as shown in, for example, Japanese Patent Laid-Open No. 59-200838 is one in which a large number of link plates are endlessly connected by pins, but a large number of blocks are assembled on the entire circumference. is there. In order for the completed power transmission belt to exhibit the desired performance, it is necessary that each component has a predetermined dimensional accuracy. Therefore, the inspection of individual parts is performed. Each block is inspected for the dimension (dimension a in FIG. 3) from the point of contact with the link of the block to the point of contact with the pulley. Further, the dimension from the pin hole center of the link plate to the contact point with the block (dimension b in FIG. 3) is also inspected for each link plate. If these dimensions are out of the allowable range, they are rejected.

(C) Problems to be Solved by the Invention However, as described above, there is a problem that a large number of man-hours are required to inspect all the blocks and link plates. Moreover, even if the individual parts are inspected, the variation of the transmission belt in the assembled state is not inspected. The present invention aims to solve such problems.

(D) Means for Solving the Problems The present invention solves the above problems by inspecting the transmission belt based on the torque fluctuation when the transmission belt is wound around the V pulley and rotationally driven. That is, the transmission belt inspecting method of the present application uses two Vs arranged in parallel.
A transmission belt is wound between the pulleys, and one of the V pulleys is driven to rotate with a predetermined tension applied to the transmission belt. Depending on whether the torque fluctuation during this rotation drive is within the allowable range, transmission is performed. Inspect the belt.

Further, the transmission belt inspection device of the present application includes a fixed-side V pulley whose axial position is fixed, a movable-side V pulley in which a distance between axes of the fixed-side V pulley is variable, and a movable-side V pulley. A tension-free mechanism capable of exerting a force in a direction away from the fixed-side V pulley, a rotary drive device capable of rotationally driving one of the V pulleys, and a torque measurement device measuring an output torque of the rotary drive device. is doing.

(E) Action By applying a force between the two V pulleys around which the transmission belt is wound by the tension applying mechanism, a predetermined tension is applied to the V pulleys. In this state, one V-pulley is rotationally driven by the rotary drive device. The V pulley is in an unloaded state. The drive torque of the rotary drive device is measured by the torque measuring device. When the fluctuation of the torque measured by the torque measuring device is within the allowable range, the power transmission belt is determined to be a passing product. As a result, the dimensions from the contact point of the block with the link to the contact point with the pulley and the dimension from the center of the pin hole of the link plate to the contact point with the block are inspected. That is, when there is a large variation in the above-mentioned dimensions, the position of the block in the state where the block is attached to the link plates connected endlessly, that is, the position of the block in the direction orthogonal to the traveling direction of the transmission belt, Will vary. If this variation is large, the pressing force concentrates on the block where the displacement of the transmission belt toward the inner peripheral side is large, and the torque is transmitted only by such a specific block. That is, the state is such that it is driven intermittently. For this reason,
The torque fluctuation will increase. On the other hand, when the link plate and the block having a small dimensional variation are used, the torque is uniformly applied to each block, so that the rotational force is smoothly transmitted and the torque fluctuation width is reduced. Therefore, by measuring the torque fluctuation, it is possible to inspect the dimensional variations of the block and the link plate.

(F) Embodiments FIGS. 1 and 2 show a transmission belt inspection apparatus according to the present invention. This transmission belt inspection device has two V pulleys, that is, a fixed V pulley 10 and a moving V pulley 12. The stationary V pulley 10 is connected to the frame via a support member 14.
It is fixed at 16. Therefore, the fixed V pulley 10 does not move. On the other hand, the moving V-pulley 12 has a support member 18
The support member 18 is attached to the frame 16 via a hydraulic cylinder 20 which is a tension applying mechanism. Therefore, the moving side V pulley 12 is a hydraulic cylinder.
By actuating 20, it is possible to move in a direction approaching the fixed-side V pulley 10 and a direction moving away from it. The fixed V pulley 10 can be rotationally driven by an electric motor 22 which is a rotational driving device. A torque meter 24, which is a torque measuring device, is provided in the middle of the drive shaft between the stationary V pulley 10 and the electric motor 22.

The transmission belt 26 is inspected as follows using this transmission belt inspection device. The transmission belt 26 is, for example, the third
And a chain type as shown in FIG. That is, a large number of link plates 30 are connected endlessly by pins 32, and a large number of blocks 34 having frictional surfaces are assembled to this. Such a transmission belt 26 is wound around the fixed V pulley 10 and the moving V pulley 12. Next, the hydraulic cylinder 20 is operated to move the moving-side V pulley 12 to the right in the figure, that is, in the direction away from the fixed-side V pulley 10.

As a result, a predetermined tension acts on the transmission belt 26. Then, the electric motor 22 is operated to rotationally drive the stationary V pulley 10. As a result, the transmission belt 26 runs, and the moving-side V pulley 12 also rotates. This electric motor 22
Output torque is measured by the torque meter 24. When the fluctuation of the torque measured by the torque meter 24 is less than or equal to the allowable value, the power transmission belt 26 is determined to be an acceptable product.
For example, if the torque fluctuates as shown in FIG. 5, it is judged as acceptable, and if it largely moves as shown in FIG. 6, it is judged as unacceptable.

As shown in FIG. 6, the torque fluctuates greatly because the block a dimension (dimension from the link contact point to the pulley contact point) and the link plate b dimension (pin hole center to the block) shown in FIG. This is because there is a large variation in the dimension up to the contact point with. In other words, if the variations in these dimensions are large, the contact state of the block 34 with the pulleys 10 and 12 when the transmission belt 26 travels fluctuates, and the block that receives a large pressing force and the block that receives a large pressing force. There are no blocks and no. For this reason, the transmission belt 26 is driven intermittently, and the torque fluctuation increases. On the other hand, if the variation in the a dimension and the b dimension is small, the blocks 34 are aligned as specified and a uniform pressing force acts on each block 34. Therefore, the transmission belt 26
Runs smoothly and the torque fluctuation becomes small as shown in FIG. Therefore, the a dimension of the block 34 and the b dimension of the link plate 30 are comprehensively inspected by measuring the fluctuation of the torque.

(G) Effect of the Invention As described above, according to the present invention, the driving torque of the transmission belt is measured, and the variation in the dimensions of the component parts is inspected based on the fluctuation of the driving torque. Compared with the case of inspecting, the number of man-hours required for the inspection is significantly reduced. In addition, it is possible to comprehensively inspect the dimensional accuracy of the transmission belt in the use state.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a view showing a transmission belt, FIG. 4 is a side view of FIG. 3, and FIG. The figure which shows the change of the product torque, No. 6
The figure is a diagram showing changes in torque of rejected products. 10 …… Fixed side V pulley, 12 …… Movement side V pulley, 20 ……
Hydraulic cylinder, 22 …… electric motor, 24 …… torque meter, 26
...... Transmission belt.

Claims (2)

[Claims] 1. A method for inspecting a transmission belt, which is constituted by assembling a number of link plates endlessly connected by pins and a number of blocks having friction surfaces, wherein two V pulleys arranged in parallel are provided. A transmission belt is wound between them, and one of the V pulleys is rotationally driven while a predetermined tension is applied to the transmission belt. Depending on whether the torque fluctuation during this rotational drive is within the allowable range, the transmission belt is A method for inspecting a transmission belt, which comprises inspecting 2. A transmission belt inspection apparatus constructed by assembling a large number of blocks each having a friction surface on a large number of link plates endlessly connected by pins, and a fixed side V whose axial position is fixed. A moving-side V-pulley having a variable axial distance between the pulley and the fixed-side V-pulley, and a moving-side V-pulley.
A tension applying mechanism capable of exerting a force on the pulley in a direction away from the fixed V pulley, a rotary drive device capable of rotationally driving one of the V pulleys, and a torque measuring device for measuring an output torque of the rotary drive device. An inspection device for a transmission belt, comprising: