JPH01299352A - Device for driving power drive belt - Google Patents

Abstract

PURPOSE:To contrive to prevent the occurrence of slips of a belt by arranging projected pins via springs for plural numbers of recessed sections which are narrowed down at the bottom section of a driving belt V-pulley groove in the circumferential direction, and thereby letting at least one projected pin be meshed with the notch section of the belt. CONSTITUTION:Notches 2 in a specified shape are provided for the bottom section of a drive belt 1 along its whole length, recessed section 4 are narrowed down at the groove bottom section 3 of a drive pulley De at equal intervals in the circumferential direction wherein projected pins 5 to be meshed with the notches 2 are arranged via springs 6 in such a way as to be freely extended and contracted. At least one tip end section 7 of the projected pins 5 is made to be meshed with the notch section 2 of the belt 1 at the early stage of driving. This constitution can thereby prevent the occurrence of slips at a small diameter drive pulley, thereby making it also possible to reduce the diameter.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a power transmission belt drive device, and particularly in use conditions where friction transmission alone cannot transmit power at the initial stage of belt drive, it is possible to reduce slippage by adding meshing transmission. The invention relates to a power transmission belt drive device that does not have a power transmission belt drive device.

(Prior art) Generally, when the pulsator of a washing machine is driven by a belt,
As shown in Fig. 3, there is a belt (16) between the driving pulley (13) connected to the motor (12) side of the washing machine (11) and the driven pulley (14) connected to the pulsator (15) side.
However, as the performance of washing machines has improved in recent years, the diameter of the drive pulley (13) has been reduced, increasing the rotation ratio and lowering the speed of the washing machine.
) and the shaft of the driven pulley (14) as much as possible by using the belt (16) under a low shaft load to simplify the mechanism, reduce weight, reduce costs, and extend the life of the bearing and belt. It is becoming common to measure

By the way, in such a belt drive device, the driving/driven pulley on which the belt (16) is hung is conventionally a type pulley having a V groove into which the belt is fitted, and the pulley and the belt are connected to each other. It is designed to transmit power through frictional transmission.

(Problems to be Solved by the Invention) However, although there is no problem with the above-mentioned belt drive device when running under normal shaft load, when running with a low shaft load, for example, in the case of the belt drive device for a washing machine, washing Due to the structure of the machine, it is not possible to make the V-pulley support very strong, and therefore the belt is driven with an axial load that is less than the axial load required from the effective belt tension, resulting in the belt slipping due to insufficient tension, resulting in insufficient transmission force. There are cases.

The present invention has focused on the above-mentioned points, and in order to further improve them, the present invention has developed a belt drive device that has less slip and good transmission power even when running with low tension and low shaft load by considering the usage pattern of (1) belt and (2) pulley. The purpose is to provide the following.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized by a pair of pulleys having a driving and driven pulley, and a friction transmission belt wound between the pulleys. In a power transmission belt drive device, notches of a predetermined shape are provided at the bottom of the transmission belt at regular intervals over the entire length of the belt, and a plurality of recesses are squeezed in the circumferential direction at the bottom of the groove of the drive pulley, and the recesses This is a power transmission belt drive device having a structure in which a protruding pin is disposed on the belt via a spring, and when the belt is driven, at least one protruding pin engages with a notch portion of the belt to assist in power transmission.

(Embodiments) Hereinafter, embodiments of the power transmission belt drive device of the present invention will be described with further reference to the accompanying drawings.

FIG. 1 shows a part of the driving state of the drive pulley and the transmission belt in the drive device of the present invention, and FIG. 2 shows an enlarged sectional view taken along the line X--X of the same device.

In these figures, (1) is a power transmission belt, such as a lap belt or an RIE belt, and the bottom thereof has notches (2) extending in the belt width direction at regular intervals over the entire length of the belt.
) is formed. The vertical cross-sectional shape of this notch (2) is an inverted V shape in the figure, but it goes without saying that it includes various shapes such as square, semicircular, etc. It is designed so that when it is bent, it can maintain a space to engage with a protruding pin, which will be described later.

On the other hand, the drive pulley (D
r), a plurality of recesses (4) are formed at equal intervals in the circumferential direction in the groove bottom (3), and the notches ( A protruding pin (5) having a predetermined shape is disposed so as to mesh with the pin 2) via a member having an elastic function, such as a spring (6).

The material of this protruding pin (5) is metal, resin, etc., and its shape is designed to engage with the notch (2) at the bottom of the transmission belt, and the width of the protruding pin (5) is determined to fit within the belt width. It needs to be 1/2 or more. If the width of the protruding pin is less than 1/2 of the width of the belt width, the engagement with the notch portion of the belt will not be sufficient, the durability will be weak, and the effect of engagement and transmission will be reduced. When the belt is fitted to the pulley, the tip (7) of the protruding pin (5) and the notch (2) of the belt engage at least at one point at the initial stage of driving, thereby functioning to prevent slips that occur during frictional transmission. is formed.

The protruding pin (5) is supported by a spring (5) so that it can be moved in the pulley radial direction by the rotation of the drive pulley (Dr).
6), and normally when the drive pulley (Dr) rotates at high speed in the initial stage of driving, the protruding pin (5) moves outward due to the action of centrifugal force that overcomes the spring force, and the belt It engages with the notch part (2) and plays a role in assisting frictional transmission. Furthermore, when a load is applied to the drive pulley (Dr) and the number of revolutions decreases, it moves inward due to the action of the spring and is no longer engaged with the notch (2) of the belt, allowing power to be transmitted only by conventional friction transmission.

(Effects) As described above, the present invention provides a plurality of recesses in the circumferential direction at the bottom of the drive V-pulley groove, and a protrusion pin is disposed in the recess via a spring, so that at least one protrusion occurs during driving. The pin engages with the notch of the belt and assists power transmission, and the slip that conventionally occurs in the small diameter drive pulley at the beginning of driving when running with a low shaft load is compensated for by the meshing transmission. This has the remarkable effect of making it possible to completely prevent this problem, and making it possible to reduce the diameter of the drive pulley and to ensure sufficient power transmission without slipping even during high-speed rotation during initial drive.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a part of the drive device of the present invention, FIG. 2 is an enlarged sectional view taken along the line X--X of FIG. 1, and FIG. 3 is a schematic explanatory diagram of a washing machine for low shaft loads. (1)...Transmission belt (2)...Belt notch (3)...Groove bottom of pulley (4)...Pulley recess (5)...Protruding pin (6)...・Spring (7)...Tip of the protruding pin (Dr)...Drive pulley Patent applicant: Mitsuboshi Belting Co., Ltd. Figure 11 Figure 2 Figure 3 z

Claims (1)

[Claims] 1. In a power transmission belt drive device consisting of a pair of V-pulleys having driving and driven pulleys and a friction transmission belt wound between the pulleys, notches of a predetermined shape are provided at the bottom of the transmission belt at regular intervals over the entire length of the belt. At the same time, a plurality of recesses are inserted in the bottom of the groove of the drive pulley in the circumferential direction, and a protruding pin is disposed in the recess via a spring, so that at least one of the protruding pins is inserted into the notch of the belt during driving. A power transmission belt drive device with a structure that meshes with the engine and assists in power transmission.