JPS6153567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a drive belt having a trapezoidal cross section suitable for transmitting torque between a pair of conical belt pulleys defining a V-shaped space for receiving the drive belt, comprising: a carrier in the form of a book or a plurality of endless metal belts, said metal belt having a continuous series of transverse members slidably relative to said carrier, said transverse members being said drive belt; It pertains to defining the cross-sectional shape of.

Such a drive belt is described in Dutch patent no.
Already known from No. 142,767, this patent discloses the operation of a drive belt which transmits torque by means of a pressing force. Such a drive belt is particularly suitable for use in continuously variable transmissions.

A disadvantage of such drive belts is that under certain operating conditions the transverse members can move laterally and cause significant wear. During such lateral movement, the transverse member strikes the side walls of the belt or belts forming the carrier.

In order to solve this problem, patent application No. 73-12089
No. 6, it is proposed to provide the transverse member with a fixing device that completely prevents lateral movement.
For this purpose, it has been proposed to provide the transverse members with interengaging devices.

However, practice has shown that such solutions are unsatisfactory for the following reasons.
This is because a mere sliding movement of two successive transverse members results in an unacceptably large sliding movement in the lateral direction in a large number of transverse members.

The object of the invention is to obtain a drive belt of the type mentioned above, which, moreover, avoids wear caused by lateral movement of the transverse members.

To this end, the drive belt according to the invention has an abrasive roughened surface formed on one or both of the adjacent surfaces of each pair of adjacent transverse members in a straight section of the drive belt.

Experiments have shown that an adverse displacement of the cross members in the lateral direction occurs when the transmitted torque is relatively small and therefore in situations where there is a relatively small mutual pressing force between the cross members. This only occurs at the pressure part of the drive belt. In slack areas where there is no pressing force at all, and in other areas where the cross members press against each other with great force, no disadvantageous displacement occurs.

From the above it follows that:
The cause of the movement of the cross members in the lateral direction is to be found in the fact that the cross members move along each other such that lateral forces are transmitted between successive cross members. This creates conditions for the series of transverse members to vibrate, as it were.

By increasing the coefficient of friction between the transverse members,
It has been discovered that said disadvantageous movement can be prevented by a method which can be implemented technically easily. It is believed that mutual movement of the cross members in the slack areas, which cannot be prevented by this method, does not have any disadvantageous effects in practice.

According to one preferred embodiment according to the invention, the friction-increasing device has a roughened surface with a small depth, for example a few hundredths of a millimeter. According to the invention, this surface roughening can be achieved by two-way surface grinding, referred to as cross-grinding.

It is important that such a roughened surface is formed in such a way that it is maintained during use of the drive belt, so that it does not wear easily or disappear during the running of the drive belt.

The invention will now be described in more detail with reference to the accompanying drawings, which illustrate one embodiment of a drive belt made in accordance with the invention.

Referring to FIG. 1, two V-shaped sheaves 1, 2 are schematically illustrated. Belt wheel 1,
The running diameter of the drive belt 3 arranged on the V-shaped sheaves 1, 2 can be varied by adjusting the mutual distance of the conical sheave portions of the V-shaped sheaves 1, 2. The rotational speed ratio between the schematically illustrated axes 4 and 5 can be varied infinitely in this way. The drive belt 3 has a number of metal cross members 6 slidably mounted on an endless carrier 7. Carrier 7 is, for example,
It has a number of metal belts combined into one or more belt packs. Preferably each of the two belt packs has a large number, for example 10
The book has metal belts slidably superimposed on each other. (In Figure 1, simply 4
One pack is shown with a belt of books).

The transverse member 6 is slightly tapered radially inwardly of the drive belt 3. This allows the drive belt 6 to run along the sheave with a curved transition, as shown in FIG.

During the movement of the drive belt 3, a tension force is exerted on the carrier 7 such that the transverse member 6 is forced to pass between the belt pulleys 1 and 2 along an essentially straight path.
Thereby, torque is transmitted between the sheaves 1 and 2 by means of a pressing force which forces the transverse members 6 into contact with each other in the loaded portion of the drive belt 3.

FIG. 2 shows the transverse member 6, which is shown in side view in FIG. 1, in a front view.
The transverse member 6 has two side faces 8 adapted to cooperate with the conical sheave portions of the V-shaped sheaves 1, 2;
As shown, it has two recesses 9 adapted to receive belt packs 7. The dashed line 10 indicates the slope line or area, ie the position at which the cross member 6 begins to taper. In the essentially straight thrust section of the drive belt 3, the transverse members 6 abut each other with their surfaces on the dashed line 10, which is indicated by cross-hatched lines in FIG. Said intersecting diagonal lines are formed by two grooves in which said surface is ground in such a way that grooves are obtained in said surface such that a relatively small pressure is exerted between the transverse members 6, thereby increasing mutual friction in the transverse direction. Indicates the grinding direction.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of two belt pulleys on which a running drive belt is arranged; FIG. 2 is a front view of the transverse member. In the drawing, 1 and 2 are "belt pulleys"; 3 is a "drive belt"; 4 and 5 are "shafts"; 6 is a "transverse member"; 7 is a "carrier"; 8 is a "side"; 9 is a "concave"Place';1
0 indicates a "slope line".

Claims (1)

Claims: 1. A drive belt having a trapezoidal cross-section suitable for transmitting torque between a pair of conical belt pulleys defining a V-shaped space for receiving the drive belt, comprising one or more drive belts. a carrier in the form of a book endless metal belt, said metal belt having a continuous series of transverse members sliding freely relative to said carrier, said transverse members crossing a cross section of said drive belt; A drive belt defining a shape, characterized in that a friction-increasing device is provided on one or both of the adjacent surfaces of each pair of adjacent transverse members in a straight section of the drive belt. 2. The drive belt of claim 1, wherein the ground roughened surface is formed by grinding one or both of the adjacent surfaces of the transverse member in two directions.