JPS5929862A - V-pulley for stepless speed change gear - Google Patents

Abstract

PURPOSE:To prevent slipping between both pulleys and a V-belt against acceleration on starting by radially providing anti-slip grooves with rugged configuration on the inside diameter part of the main driving shaft V-pulley and the outside diameter part of the driven shaft V-pulley. CONSTITUTION:On starting operation, i.e., when accelerating, a belt 13 is set around the inside diameter side of a driving shaft V-pulley 11 and, on the other hand, around the outside diameter side of a driven shaft V-pulley 12, i.e., around the rugged grooves 18 of both pulleys, and the rotating power of the driving shaft 16 is transmitted to the belt 13 through V-blocks 14 engaged with the grooves 18, rotating the driven shaft 19. When the speed increases beyond the specified level, i.e., when acceleration is lowered, the diameter of the belt 13 winding around the driving shaft V-pulley 11 is reduced and the belt comes off the both pulley grooves 18, transmitting the required torque by only the frictional resistance between the V-pulleys 11 and 12 and the inclined surface 15 of the V-blocks 14.

Description

[Detailed description of the invention] This relates to a pulley that is suspended.

The principle of transmitting power from the driving shaft to the driven shaft in a continuously variable transmission is to utilize the frictional force generated between the V-shaped belt suspended from the pulleys attached to the driving shaft and the driven shaft, respectively, and the sloped surface of the pulley. By adjusting the width of the pulley, stepless speed change is possible.

However, unlike roller chains, which are often used as power transmission devices, or power transmission systems that have a constant pitch and are engaged with sprocket teeth, winding inevitably causes slippage between the pulley and the V-belt. Needless to say, misalignment between the two shafts leads to a reduction in power transmission efficiency.

Therefore, a method has conventionally been adopted in which uneven grooves are provided on the sloped surface of the pulley to suppress the slippage with the V-shaped belt. There is no problem if it is a belt, but if it is a continuously variable transmission belt made of metal and has a specific pitch, there will be a problem in meshing with the uneven grooves. That is, when uneven grooves are provided radially on the inclined surface of the pulley, the pitch between the grooves becomes larger due to an increase in the diameter, and a difference occurs between the pitch of the belt that should engage the grooves.

The above-mentioned difference between the uneven grooves on the inclined surface of the pulley and the belt pitch may cause the belt to slip, resulting in an adverse effect.

Generally, when power is transmitted between the main drive shaft and the driven shaft, slippage between the pulley and V-shaped belt occurs during acceleration, and after reaching a certain speed, the acceleration decreases and the occurrence of slippage becomes extremely rare. .

The object of the present invention is to prevent slippage between the pulley and the belt on which a metal gV-type belt is suspended, particularly initial slippage during acceleration.

Embodiments according to the present invention will be described in detail below based on the drawings.

FIG. 1 shows a state in which a belt (/3) is hung over a V-shaped pulley (//), (/, 2) according to the present invention.
//) fi main driven shaft type pulley (/, ri is driven shaft V
The model pulley (/3) is a belt.

The above bell) (/J) is not a rubber V-belt, but a large number of V-blocks (/J) as shown in Figures 2 and 3, for example.
This is a belt made of metal or a similar material, which is constructed by connecting two blocks. #i It is transmitted to the belt (/3) due to the frictional resistance with the slope (/3), and the driven shaft V-type pulley (/, 2)
gives rotational force to.

By the way, the main drive shaft V-type Boo'J - (//) inner surface (/7
) has a bell on the inner diameter near the main drive shaft (/B) (/J)
Considering the pitch of , the uneven grooves (/l) are provided at a pitch corresponding to the pitch.

On the other hand, the driven shaft V-type pulley (/, 2) is the opposite of the driven shaft side. A similar uneven groove (7g) is provided on the outer diameter of h (/!i').

The shape of the groove may be a smooth continuous curve as shown in Figs. （／／） （／、
2) A bell that can be hung on a rack) (/J) It should be determined by the shape. The area where uneven grooves (/za) are still to be provided, that is, the inner diameter of the main drive shaft V-type pulley (//) and the outer diameter of the driven shaft V-type pulley IJ- (/2), is the pitch length of the belt (/3). Acceleration during sheath operation should be considered.

By the way, to explain the function of the V-type pulleys (//), (/, 2), at the start of operation, that is, at the time of acceleration, the bell)
(/J) has an uneven groove (/lr) on the inner diameter side of the driving shaft V-type pulley (//), and on the outer diameter side of the driven shaft V-type pulley (/, 2). The rotational power of the main drive shaft (/6) is transmitted to the belt (/3) via the V block (/3) that engages with the groove (7g), and the rotational power of the main drive shaft (/6) is transmitted to the belt (/3) Rotate (/9). If the speed exceeds a certain level, that is, if the acceleration decreases, the main drive shaft V-shaped IJ
- (bell wrapped around
A predetermined torque can be transmitted only by the frictional resistance between //), (/ko) and the (/g) sloped surface (/y) of the ■block (/g).

As described above, the present invention has a main drive shaft V-type boot IJ-(//
) and the outer diameter of the driven shaft V-type boob IJ - (/, 2) are provided with uneven grooves (/lr) in a radial pattern to prevent slipping, and the The V-type pulley (//), (/2) and the belt (/3) transmit power to the driven shaft without slipping, and after reaching a steady speed, the V-shaped pulley (//) (/2) and the belt (/3) are released from the groove (7g). End, Figure 1, Figure 3
A belt with unevenness at a constant pitch as shown in the figure (/J
) is very effective in continuously variable transmissions. It is particularly applicable to continuously variable transmission devices such as motorcycles that require acceleration when starting.

[Brief explanation of drawings]

Fig. 1 shows a case where a belt is hung on a V-shaped pulley according to the present invention, Fig. 2 shows seven examples of belts used, and Fig. 3 shows a cross section taken along line A-A in Fig. 2. Further, Fig. 3 shows a main drive shaft - type pulley, and Fig. 5 shows a driven shaft V-type pulley. (//)...Driver shaft V-type pulley (/2)...Driver shaft V-type pulley (/J)...Belt (/4+ri...V block (/j)...Slanted surface (/Otsu)...Main shaft (
/7)...Inner surface (7g)...Groove (/″?)
... Driven shaft patent applicant Daido Kogyo Co., Ltd. Agent Hiko Hirasaki Jiha Fig. 2 Fig. 3＼ Mouth 1δ Fig. 4 Fig. 5 301-

Claims (1)

[Claims] In a continuously variable transmission device consisting of a combination of a V-shaped pulley and a belt made of a metal cape or a similar material that is uneven at a constant pitch, the main drive shaft is V-shaped Boo'J-(/
There is an uneven groove (/za) on the inner diameter chamber near the main drive shaft (/B) of /) and the outer diameter of the driven shaft'V-type jib-J-(/2').
A V-type pulley for a continuously variable transmission characterized by having radially arranged.