JPS6237010Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a transmission device in a power transmission mechanism using a belt and a pulley.

(Prior art) Conventionally, a V-shaped belt is placed on pulleys attached to a driving shaft and a driven shaft, and the rotational speed ratio of both pulleys is adjusted by changing the width of each pulley and changing the diameter of the pulley on which the V-belt is placed. There was a transmission that changed the speed continuously and steplessly.

(Problem that the invention aims to solve) However, since power is transmitted by the frictional force between the pulleys and the V-belt, losses due to slips are likely to occur, which is an obstacle to improving power transmission efficiency. was.

(Example) This invention was made in view of such problems, and its structure will be explained below based on the example shown in the drawings.

As shown in Fig. 1, the transmission includes a primary pulley 2 attached to a driving shaft 1, and a driven shaft 3.
It has a secondary pulley 4 attached to the primary pulley 2 and a V-shaped belt 5 that is stretched across the primary pulley 2 and the secondary pulley 4, and the pulleys 2 and 4 are attached to the V-shaped belt as shown in FIG. A pair of conical plates 6, 7 with a conical surface on the inclined surface of 5.
and 8 and 9 are arranged facing each other, one of the conical plates 6 and 8 is fixed to the shafts 1 and 3, and the other conical plates 7 and 9 are fixed to the shafts 1 and 3.
By fitting movably on the axis and adjusting the positions of the conical plates 7 and 9 using the adjuster 11 and the stopper 12, the distance between the opposing conical plates 6 to 9,
In other words, the diameter position of the V-shaped belt 5 of the pulleys 2 and 4 can be varied continuously and steplessly. Further, sawtooth-like uneven portions 12 and 13 are provided at equal intervals on the inner circumferential surface of the maximum diameter portion of the primary pulley 2 and the inner circumferential surface of the minimum diameter portion of the secondary pulley 4. 1
The equally spaced concave and convex portions 14 that engage with the V-shaped belt 5
provided on the inner circumferential surface or side surface of the The position of the adjuster 10 can be changed so that the width of the primary pulley 2 decreases as its rotational speed increases, and the width of the secondary pulley 4 increases. The stopper 11 is provided to maintain the maximum width of the pulleys 2, 4. Note that the mechanism for changing the widths of the pulleys 2 and 4 may be a mechanical governor that applies centrifugal force.

(Function) With this structure, at the time of starting, the state is as shown in Fig. 1, and the motor or electric motor (not shown) connected to the driving shaft 1 is started and brought into a state of low to medium speed rotation. As the width increases, the width of the primary pulley 2 becomes narrower and the width of the secondary pulley 4 becomes wider, and the V-shaped belt 5 moves to the position shown in FIG. When the rotation speed is further increased, the uneven portion 14 of the V-shaped belt 5 becomes the uneven portion 12 of the primary pulley 2 and the uneven portion 1 of the secondary pulley 4.
3, the V-shaped belt 5 no longer slips, and power is efficiently transmitted from the primary pulley 2 to the secondary pulley 4. in this way,
In the low/medium speed rotation state, the pulleys 2 and 4 are continuously rotated in a stepless manner due to the frictional coupling of the V-shaped belt 5.
However, in a high-speed rotation state in which the V-shaped belt 5 is used for a relatively long time, the rotation speed is converted at a constant transmission ratio in a gear type manner by coupling with the concavo-convex portion 14 of the V-shaped belt 5. This transmission is particularly suitable when an AC inductance motor with low starting torque is used as the prime mover, and is used as an automatic transmission for rotating equipment such as record players and tape recorders, automobiles, etc.

(Effects) As mentioned above, according to this invention, the engine can be started with a small starting torque at first, and then the rotation transmission ratio can be changed continuously in a stepless manner. pulley and V
By coupling the gears of the type belt, it is possible to eliminate loss due to slippage and improve power transmission efficiency.
This excellent effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a transmission implementing this invention, and FIG. 2 is a sectional view of the main part of FIG. 1. 1... Driving shaft, 2... Primary pulley, 3
... Driven shaft, 4 ... Secondary pulley, 5 ...
V-shaped belt, 6 to 9... Conical plate, 12 to 14...
Uneven parts.

Claims (1)

[Scope of utility model registration request] A primary pulley that is attached to the driving shaft and whose width narrows when it is in a high-speed rotation state, a secondary pulley that is attached to the driven shaft and whose width increases when it is in a high-speed rotation state, and a V-shaped pulley that is hung between this secondary pulley and the primary pulley. and a belt, provided with uneven portions at equal intervals over the entire circumference of the inner circumferential wall of the largest diameter portion of the primary pulley and the inner circumferential wall of the smallest diameter portion of the secondary pulley, and has uneven portions that engage with these uneven portions. A transmission device that is provided at equal intervals over the entire circumference of the inner circumferential wall of the V-shaped belt.