JPS6323627Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a V-belt device for power transmission that runs around a V-belt wheel.

BACKGROUND OF THE INVENTION A V-belt device for power transmission consisting of a number of metal members slidably attached to an endless metal band in the longitudinal direction thereof is known from Japanese Patent Publication No. 55-6783. FIG. 1 shows such a V-belt device 110, in which a large number of metal members 112 are disposed on a flexible endless belt 111 made up of a plurality of overlapping metal strips.
is being passed. The wall of the hole 113 in the metal member 112 through which the endless band 111 is passed is rounded on the side of the center of curvature of the endless band.

However, in such a configuration, the metal member 1
The tilting movement of 12 causes excessive bending stress to act on the endless metal band 111, significantly reducing its durability. Furthermore, during the tilting movement of the metal member 112, the contact surfaces 114 between the metal members slip, reducing the transmission efficiency, and the wear of the contact surfaces 114 of the metal members reduces the durability of the belt transmission device. Furthermore, transmission efficiency deteriorates due to biting loss that occurs when the metal member 112 is bitten into the V-shaped groove of the belt pulley, and durability decreases due to slippage on the meshing surface.

SUMMARY OF THE INVENTION The present invention provides a V-belt device that does not have these drawbacks. Therefore, the V-belt device according to the present invention includes a flexible endless belt, a number of suspension members slidably attached to the endless belt in the longitudinal direction, and a side wall of the V-shaped groove of the V-belt wheel. The transmission pieces have corresponding side surfaces and are swingably supported by the suspension members.

Embodiment In FIGS. 2 to 6, an endless belt 2 consisting of three flexible layers of metal or woven fabric strips 2a to 2c of the V-belt device 1 is provided with an endless belt 2 that surrounds it and extends along its length. A large number of frame-shaped suspension members 3 are slidably attached to the frame. These suspension members 3 have a U-shaped member 4 made of rigid metal or ceramic, and on the bottom side 4a of this U, there is an endless band 2 between both leg sides 4b, which passes through a hole 4c in the leg side 4b. Its cross section is surrounded by the pin 5. As can be seen from FIG.
is rounded in the length direction so that when the suspension member 3 swings about an axis parallel to the pin 5, it contacts the endless band 2 without bending it. On both sides of the U-shaped member 4, pivot projections 4e projecting laterally from the bottom side 4a are formed, and side surfaces 7 corresponding to the side walls 6b of the V-shaped groove 6a of the V-belt pulley 6 are formed.
The almost U-shaped transmission piece 7 with a has a leg side 7b.
The hole 7c in the U is fitted onto the pivot protrusion 4e.
It is swingably supported by the character-shaped member 4. As can be seen from the figure, the diameter of the hole 7c is made slightly larger than the diameter of the pivoting projection 4e, so that play is generated. This transmission piece 7 is also made of rigid metal or ceramic. As can be seen from FIG. 5, the distance between the tips of both pivoting protrusions 4e is smaller than the distance between the side walls 7a of the transmission piece 7 in the support range, that is, the range of the hole 7c. It is designed not to come in contact with. As can be seen from FIG. 6, the thickness d of the transmission piece extending in the length direction of the endless band 2 decreases from at least the area of the hole 7c toward the center of curvature of the endless band 2. Further, as can be seen from FIG. 5, the U-shaped transmission piece 7 consists of two L-shaped pieces 71 and 72 divided by the vertical center plane Y-Y of the endless band 2, and
The protrusion 75 formed on the other piece 72 is press-fitted into the hole 7e on one piece 71 in the U
It constitutes a letter-shaped transmission piece 7. On the bottom side 4a of the U-shaped member 4 of the suspension member 3, a contact ridge 4f is formed that slightly protrudes from the transmission piece 7 in one or both directions in the length direction of the endless band 2, thus keeping it in a straight state. Adjacent U-shaped members 4 in the length direction of a certain endless band 2 are in contact with each other at contact ridges 4f, and the transmission pieces 7 are not in contact with each other.

Of course, this contact protuberance 4f is eliminated, and the thicknesses of the U-shaped member 4 and the transmission piece 7 in the length direction of the endless band are made the same, so that the U-shaped member 4 and the transmission piece 7 adjacent in the length direction of the endless band 2 may be in contact with each other.

FIG. 7 shows an example in which such a V-belt device 1 is used in a continuously variable transmission for an automobile.
can be connected to a drive V-belt pulley 6 via a clutch 11. This V-belt pulley 6 includes a disc 61 fixedly connected to the output shaft 12 of the clutch 11, and an opposing movable disc supported on the output shaft 12 so as to be movable only in the axial direction with respect to the disc 61. It is composed of a plate 62. A device for changing the mutual spacing of the discs 61, 62 is not shown. The V-belt device 1 that is routed around this drive V-belt pulley 6 is
It also runs around a driven V-belt pulley 6' having the same configuration as the belt pulley 6, and the driven shaft 13 of this belt pulley 6' is
A differential gear unit 15 is driven via a reduction gear unit 14 .

Operation The V-shaped groove side wall 6b of the drive belt pulley 6 transmits the driving force to the transmission piece 7 while applying clamping pressure to both side surfaces 7a of the transmission piece 7. This driving force is transmitted from the hole 7c of the transmission piece 7 to the pivot projection 4e of the U-shaped member 4, and is transmitted to the next U in the length direction of the endless band 2 via the contact protuberance 4f of this U-shaped member. It is transmitted to the character-shaped member 4 in the form of thrust. In this way, the U-shaped members 4 located outside the range of the drive belt pulley 6 receive thrust from adjacent U-shaped members in sequence.

The transmission piece 7 and the U-shaped member 4, which are about to be caught in the driven V-belt sheave 6', must tilt toward the center of the driven V-belt sheave 6', as shown in FIG. Since the transmission piece 7 is swingably supported by the pivoting protrusion 4e of the U-shaped member with play, the transmission piece 7 is tilted by the tilting movement of the transmission piece 7.
Alternatively, since the U-shaped member does not push up the endless band 2 and can tilt smoothly, no large bending stress is applied to the endless band 2. Therefore, the biting loss to the V-belt wheel is also reduced. Further, since the relative movement between the transmission piece 7 and the endless band 2 during the tilting movement of the transmission piece 7 is reduced, wear of the endless band 2 is reduced. Further, due to the contact protuberance 4f, there is no mutual sliding contact between adjacent transmission pieces 7 during the tilting movement of the transmission pieces 7, so there is no wear due to this, and the durability of the V-belt device can be improved.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a conventional V-belt device, Fig. 2 is a cutaway side view of a suspension member of the V-belt device according to the present invention, and Fig. 3 is a perspective view of the suspension member with pins removed. , FIG. 4 is a sectional view taken along the - line in FIG. 2, FIG. 5 is a partially cutaway front view of the V-belt device running around the V-belt wheel,
The figure is a side view of the suspension member and transmission piece, Figure 7 is a configuration diagram of an automobile drive system with a continuously variable transmission using such a V-belt device, and Figure 8 is a V-belt device running around a V-belt vehicle. FIG. 1... V-belt device, 2... Endless band, 3... Suspension member, 4f... Contact bump, 6... V-belt wheel,
6a...V-shaped groove, 6b...side wall, 7...transmission piece, 7b...side surface.

Claims (1)

[Scope of claim for utility model registration] 1. A V-belt device that is routed around a V-belt vehicle,
A flexible endless band, a number of suspension members slidably attached to the endless band in the longitudinal direction, and each suspension member has a side surface corresponding to the side wall of the V-shaped groove of the V-belt wheel. A V-belt device for power transmission, comprising a movably supported transmission piece. 2 The suspension member has a frame shape surrounding the endless band, and the U
It consists of a letter-shaped member and a pin that passes through both leg pieces of the U, and has pivoting protrusions that protrude laterally on both sides.
The device according to claim 1, which is a registered utility model, characterized in that a substantially U-shaped transmission piece is supported on the protrusion so that its legs can swing. 3. The device according to claim 1, characterized in that the suspension member has a contact ridge that slightly projects from the transmission piece in the length direction of the endless band in the area of the base of the U. 4. The device according to claim 1, wherein the endless band is a band made of at least one piece of metal or woven fabric. 5. The device according to claim 1, wherein the suspension member and the transmission piece are made of rigid metal or ceramic. 6 The distance between the tips of both pivoting projections of the suspension member is
2. The device according to claim 2, wherein the distance is smaller than the distance between both sides of the transmission piece in the support range. 7. The device according to claim 1, wherein the bottom side of the U of the suspension member in contact with the endless band is formed with a convex surface that is rounded in the length direction of the endless band. 8. The transmission piece that is swingably supported by the pivoting projection of the suspension member has a hole with a diameter slightly larger than the diameter of the pivoting projection, and is seated on the pivoting projection with play through this hole. The device according to claim 2 of the utility model registration claim, characterized in that: