JPS5917043A - Wrapping connecting type power transmission device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large power transmission device for use in continuously variable transmissions and the like.

Large power transmission devices that enable stepless speed change include those that use a V-belt on a V-shaped pulley, and those that use a chain or wire set equipped with a V-shaped guide. The present invention belongs to the latter category, and many chains of this type have been developed in the past. (For example, U.S. Patent No. 3720//3, google/special) The above U.S. patent?
7. +(7//, ? is made up of superimposed steel bands and multiple V-shaped metal blocks, and the power given from the main drive shaft pulley is used as the propulsion force of the V-shaped metal blocks to generate steel. The steel band is transmitted to the guide driven shaft pulley.In other words, the V-shaped metal block is a thin plate shaped like a V-shape so that both sides are in contact with the V-shaped goo v-1. is inserted so that it can slide over it.

However, when the above-mentioned large power transmission device is wrapped around a pulley, it curves with a predetermined radius of curvature as it curves around the pulley like a belt, and the tensile stress on the outer circumferential surface of the steel band is Compressive stress acts on the inner peripheral surface. The above bending stress cannot be reduced by increasing the number or width of the steel bands, and if the running radius of the steel band is made smaller in order to make the transmission more compact, the maximum bending stress increases accordingly. Moreover, the bending stress is always generated as long as the pulley rotates around the pulley even in a no-load idling state in which no power is transmitted, and is almost unrelated to the magnitude of the transmitted power.

The above-mentioned bending stress generated in the steel band is not static, but occurs only when the band is wrapped around a pulley, and not when it is in a straight line, so it becomes a dynamic repeated stress, which adds fatigue. Therefore, the life of the steel band, especially the band on the innermost circumferential side, is short, and the problem is that the durability of the large power transmission device is low. Furthermore, as an additional problem, the winding is a large power transmission device in which V-shaped metal blocks are arranged around an endless annular steel band, and the circumference of the band cannot be easily changed. ,
The positional relationship between the driving and driven axes cannot be changed arbitrarily. In other words, the length of the endless annular steel band controls the distance between the driving shaft and the driven shaft, resulting in the inconvenience of restricting the degree of freedom in design.

By the way, the present invention uses chains, wires, etc. in place of the above-mentioned steel bands, and is aimed at improving the durability of the power transmission device.One embodiment of the present invention will be described below based on the drawings. This will be explained in detail.

Figure 1 shows a large power transmission device (1) (
This device (hereinafter referred to as "this device") is hung on a V-shaped boo')-(2), and this device (1) has a large number of V blocks ( //), and a leaf chain (/2) consisting of a combination of link grate and pin, and the above ■block (//) is an opening (/, 2).
The leaf chain (/2) is inserted into the opening (/J).

In other words, the V blocks (//) are arranged without any gaps using the leaf chain (/J as a guide), and the ■ block (
/No and Leaf Chain (/Isao are not fixed in any way so that they can slide relative to each other.

Although Figures 1 and 3 show leaf chains (/J), they are not limited to leaf chains (/), and may include roller chains or bush chains that do not use rollers. As shown in the cross section in Figure 1, a wire lobe (/3) may be used instead of the chain, and even a rubber reinforced belt may be used.
It can fully demonstrate its function as a guide for the block (//).

Furthermore, in place of the cylindrical bottle, it is even more preferable to use a chain using an electric wire "-≧CW" as shown in FIG. 5 to prevent chain elongation.

By the way, the slope angle (16) of the V block (l/) is
IE)) corresponds to the inclined surface of the V-shaped pulley), and both adjacent sides (/7) or one side are convex so that they can be bent, and the thickness H) can be selected arbitrarily. However, it is possible to wrap around a V-shaped pulley, and considering the contact area, the smaller the better, and the shorter the pitch length of the leaf chain.

Furthermore, the leaf chain (/■ and the V block (/) are mutually free to move in the longitudinal direction, but the V block (//) is attached to the leaf chain (/2) at the opening (/metal). After installing it, you can swage it with a head (/φ), etc. to prevent it from coming off.
It is also possible to provide an interference margin and use elastic deformation to attach it.

However, as shown in the figure, a V block (//) without this opening (10) may also be used. Insert the remaining V block (//) and connect the 7th block after connecting the chain.
A V block with an opening (/) as shown in the figure (//
) can also be screwed to the top plate (/j).

As described above, the present invention provides a leaf chain (/-211
V-blocks (//) are inserted and aligned to form the main drive shaft V-type Boo! The rotational force of I-(-2) is the V-shaped boo
−(, slope of V block (//) in contact with ri (/Otsu)
The frictional force between the two wheels propels the forward V-block (//), and the driving force is transmitted to the driven shaft V-shaped block (//) using the leaf chain (//) as a guide.

The leaf chain (/necessary) is only tensioned to prevent this device (1) from sagging, and the V block (
It acts as a guide for the V-shaped pulley (2), and even when wrapped around the V-shaped pulley (2), it bends around the pin, so durability is a problem due to bending fatigue e like the steel band mentioned in the conventional example. There is no loss of energy required for bending the steel band or sliding between the superposed layers due to the above-mentioned target, and the winding with a higher transmission effect is a large power transmission device. Furthermore, by increasing the number of links in the chain, the circumference of the device (1) can be easily increased.
Conversely, it can be shortened by reducing the number of links, and can easily accommodate changes in the distance between the driving shaft and the driven shaft.

Furthermore, Fig. 4 shows a case where a wire rope is used as a guide, but the wire rope is made by twisting many thin wires, and is easily bent, and its fatigue strength against bending is extremely high. Strong against

Furthermore, as mentioned above, each V block (//)
A predetermined power is transmitted by a propulsive force based on the compressive stress between the two, and in terms of strength, a conventional tension-based hook is much stronger than a power transmission device.

[Brief explanation of the drawing]

Figure 7 shows the device suspended on a V-type pulley, Figure 2 is a vertical cross-sectional view of the device, and Figure 3 is the A--
A further cross-sectional view shows the wire □ cutting area. ,)t
jI&1ka. , No. □ Yopi Senji ←-Lost chain,
FIG. 3 shows a cross section when a leaf chain is inserted into a V-block without an opening, and FIG. 7 shows a cross section when the opening is screwed to the upper plate. (1)------One winding is a large power transmission device (---
-, V-type pulley (//)----, V block (/required----Leaf chain (/J)----Wire rope (/4Q----~head Department (/!>-
---------1 plate (/B)----One inclined surface (/7), ------One side surface (/W1----Opening patent applicant Daido Kogyo Co., Ltd. Company Agent Hikoji Hirasaki Figure 1 Figure 3 Figure 4 Figure 6 Figure 7 (¥) Figure 5

Claims (1)

[Claims] ((a) A circular chain t, in which a large number of V blocks (//) having an inclination angle that abuts the inclined surface of the V-shaped pulley (, 2) of the drive device are inserted without any gaps. - The windings formed by arranging them are a large power transmission device. (The windings described in claim 1 are a large power transmission device. (3) The wrapping described in claim 7, in which the chain is a roller chain, is a large power transmission device. The chain described in Items 1 to q is a large power transmission device. (≦) The chain described in Claim 1, in which the chain is a wire lobe (/J), is a large power transmission device. (7) Chain The winding device according to claim 1 is a large power transmission device in which the belt is a rubber-based reinforced belt.