JPS60121342A - V-belt equipment for transmission of motive power - Google Patents

Abstract

PURPOSE:To increase transmitted torque to such a degree that the endless belt of a V-belt equipment might be broken, by providing the transmission blocks of the V-belt equipment, which are engaged in V-belt pulleys, with a very high rigidity in the directions perpendicular to the longitudinal direction of the endless belt. CONSTITUTION:The transmission blocks 6 of a V-belt equipment 1, which are engaged in the V-groove 12b of a driving V-belt pulley 12, are made of a rigid material such as metal, sintered alloy and ceramic. The transmission blocks 6 receive the torque of the V-belt pulley 12 by the frictional force between the side surfaces 6a of the blocks and the walls 12a of the V-groove of the pulley. The torque is then transmitted to other transmission blocks 6 engaged in a driven V-belt pulley 14, by the tension of an endless belt 2 on which suspension members 3 supporting the transmission blocks are secured. The torque is thereafter transmitted from the latter transmission blocks 6 to the driven V-belt pulley 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a V-belt device for power transmission, particularly to a V-belt device suitable for use in a continuously variable transmission.

PRIOR ART As such a V-belt device, for example, a rubber belt with a trapezoidal cross section is used, but its rigidity (lateral rigidity) in the lateral direction, that is, in the direction perpendicular to the length direction, is low, and when it is caught in the belt wheel. This results in buckling deformation in the lateral direction,
It cannot transmit large amounts of power. In addition, since the thickness of the belt, that is, the lead portion between the two bases and the lower base is large, it is difficult to obtain a small radius of curvature, resulting in a disadvantage that a large range of gear ratios cannot be obtained.

Furthermore, a V-belt device consisting of a large number of transmission pieces that are penetrated by an endless metal band made of a plurality of laminated metal strips and can slide in the longitudinal direction thereof is also known from Japanese Patent Publication No. 55 (4)-6783. However, since the transmission piece slides along the endless band, there is a drawback that friction loss occurs and the power transmission efficiency decreases.

SUMMARY OF THE INVENTION The present invention provides a V-belt device which does not have these disadvantages and includes a flexible endless strip and a number of rigid suspension members secured to the endless strip at right angles to the length of the endless strip. It is comprised of a roughly 11-shaped rigid conduction piece that is swingably supported by pivot projections projecting from each suspension member to both sides and can be engaged with a V-shaped groove of a V-belt pulley.

Embodiment FIGS. 1 and 2 show a V-belt device according to the present invention, in which a flexible endless belt 2 is made of a metal plate or a woven fabric made of plant, animal or synthetic resin fibers or strings. has a large number of metal U-shaped suspension members 3 surrounding the top and both sides thereof and extending perpendicularly to its length.
is fixed to the endless band 2 along with the metal opposing plate 4 which is the bottom surface of the endless band 2 by means of studs 5 (5) passing through these parts 2, 3 and 4, with the endless band 2 in between.

Fixing can also be carried out by gluing, hemming, caulking or welding. These suspension portions 3 are arranged closely in the longitudinal direction of the endless band 2, as shown in FIG. Pivot protrusions 3b projecting laterally are integrally formed on both sides 3a of the U of the suspension member 3, and the central axis X
-X passes through approximately the center of the thickness of the endless band 2.

A roughly U-shaped rigid transmission piece 6 made of metal, sintered alloy, ceramic or plastic and having an outer surface 6a corresponding to the side fJ12a of the V-shaped groove 12b of the belt pulley 12,
The hole 6c in the leg side 6b is fitted onto the pivoting protrusion 36, and the suspension member 3 and thus the endless band 2 are swingably supported.

As can be seen from the figure, the diameter of the hole 6C is formed to be slightly larger than the diameter of the pivot projection 3b, so that play occurs. Since the mutual distance between the outer surfaces of both sides 3a of the suspension member 3 is smaller than the mutual distance between the inner surfaces of both sides 6b of the transmission piece 6, the leg side 3a of the suspension member 3 and the transmission piece 6 (6) A gap 7 is created between the leg side 61 of the Note that the mutual distance between the tips of both pivoting protrusions 3b is selected to be larger than the mutual distance between both rows of side surfaces 6a of the transmission side 6, so that the suspension member 3, together with the endless band 2, is lateral to the transmission side 6. Even if the protrusion 3b is deflected to the side, the tip of the protrusion 3b does not protrude from the outer surface 6a of the transmission side 6. The U-shaped transmission piece 6 consists of two L-shaped pieces 6], 62 that are symmetrical with respect to the longitudinal center plane y-y of the endless band 2, and the two pieces 6], 62 are arranged at the base 6d of the U. Blind hole 6 extending coaxially from the butt surface
1a and 62a are connected to each other by a common pin 8 that is press-fitted into them. The width d of the transmission side 6 taken in the longitudinal direction of the endless band 2 is selected to be such that adjacent transmission sides 6 in the endless band 2 extending straight are in contact with each other, as shown in FIG. It is. This @d is narrowed in a wedge shape from a position 9 above the bottom surface of the endless band 2, that is, a position within the thickness range of the endless band 2, toward the bottom side 6d. Therefore, when the endless belt 2 is in a straight state, there is a position (7) between the adjacent transmission sides 6. Gap 10 of isosceles triangle with i9 as vertex
only remains. The rate of decrease of this width d is therefore between Fa1
The apex angle of 0 is selected such that when the endless band 2 wraps around the bell 1-wheel with its bottom surface inside the curvature, there will be no gap [10] at its minimum radius of curvature ( Figure 5).

FIG. 4 shows a continuously variable transmission using such a V-belt device 1, in which a truncated conical disc 121 is fixedly provided on the input shaft II and an input shaft is movable only in the axial direction with respect to the truncated conical disc 121. The driving belt pulley 12, which consists of a truncated conical disc 122 supported on the shaft 11, has a V-shaped groove 1 with its conical surface 12a.
2b is divided. These conical surfaces 12a are V-shaped grooves 1
It forms the side wall of 2b. A driven belt pulley 14 on the output shaft 13 provided parallel to the input shaft 11 also
Similarly, a fixed truncated conical disk 141 and a movable truncated conical disk 14
2, and its conical surface 14a forms a V-shaped groove 141).
are divided. ■The belt device 1 is wound around both ■belt wheels 12 and 14, and is routed from the input shaft 11 to the output shaft 13.
Transmit power to (8).

The transmission side 6 of the belt device 1 pinches the V-shaped groove 12b of the driving V-belt sheave 12. The V-shaped groove side wall of the belt sheave 12] 2a and the transmission side outer wall 6a ■Receives the torque of the belt pulley 12 due to the frictional force between the This torque is transmitted as a tensile force of the endless belt 2 to which the suspension member 3 supporting the transmission side 6 is fixed, to the transmission side 6 where it engages the driven V-belt pulley 14, and from this transmission side 6 as described above. In the same way, it is transmitted to the belt pulley 14.

Effects According to the present invention, the transmission side of the belt device has a much larger rigidity in the direction perpendicular to the length direction of the endless belt than conventional rubber belts, so that A large surface pressure from the side wall of the V-shaped groove can be applied to the transmission side, and therefore the transmission torque can be increased to the extent that the endless band breaks, and (9) it is possible to generate significantly more power than the conventional rubber bell. transmission becomes possible. Furthermore, the belt device as a whole can have the minimum radius of curvature allowed for the endless belt, and therefore can have a wide range of speed ratios. Moreover, since the endless belt is surrounded by the suspension member and further surrounded by the rigid transmission side, when it is bitten by the belt pulley, it is not subjected to the pressure of the V-shaped groove at all, so its lateral rigidity is taken into consideration. It is sufficient to design by considering only the tension.

Note that the suspension member is fixed to the endless band and the transmission side does not come into contact with the endless band at all, so there is no relative movement between the endless band and the suspension member or the transmission side, and therefore no friction loss occurs and the power transmission efficiency is improved. It becomes possible to further increase it. Finally, since the transmission side can be displaced in the width direction of the endless band with respect to the suspension member, the transmission side side wall can uniformly contact the V-shaped groove side wall of the bell 1 wheel.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the ■belt device according to the present invention, (lO) Fig. 2 is a sectional view taken along line II-II, Fig. 3 is a side view, and Fig. 4 is a stepless belt device using the ■belt device. FIG. 5 is a schematic diagram of the transmission, and is a partially cutaway side view of the belt device that is routed around the V-belt vehicle. l...■ Belt device, 2... Endless band, 3... Suspension member, 3b... Pivoting projection, 6... Transmission piece, 12, 1
4...V Held car, 12b, 14b ---V
gutter groove. (11)

Claims (1)

[Claims] 1. A belt device that is run around a V-belt wheel includes a flexible endless band and a number of rigid suspension members fixed to the endless band at right angles to the length direction of the endless band. , consisting of a substantially U-shaped rigid conduction piece that is swingably supported by pivot projections projecting from each suspension member to both sides and can be held in a V-shaped groove of a V-belt wheel. A V-belt device for power transmission. 2. The device according to claim 1, wherein the suspension members are in close contact with each other in the longitudinal direction of the endless band. 3. Claim 1, characterized in that the flexible endless band is composed of a metal band plate, or a woven fabric of fibers or strings of plants, animals, or synthetic materials.
Equipment described in Section. (1) 4 Claim 1, characterized in that the transmission piece is made of metal, sintered alloy, ceramic, or plastic.
Equipment described in Section. 5. A patent claim characterized in that the width of the transmission piece in the longitudinal direction of the endless belt decreases in a wedge shape from a position within the thickness of the endless belt toward the center of curvature of the belt device. The device according to range M1. 6. The device according to claim 1, wherein the central axis of the pivot projection passes through approximately the center of the thickness of the endless band. 7. The device according to claim 1, wherein the suspension member is formed into a substantially U-shape surrounding one bottom surface and both side surfaces of the endless band. 8. The device according to claim 7, wherein pivot projections projecting laterally are integrally formed on both sides of the U-shaped suspension member. 9. The suspension member surrounds one bottom surface and both sides (2) of the endless band to form a nearly IJU shape, and is fixed to the endless band together with the opposing plate that corresponds to the other bottom surface of the endless band. An apparatus according to claim 1. 10. The device according to claim 1 or 9, wherein the suspension part is fixed to the endless band by riveting, gluing, edge bending, caulking, or welding. 11 U-shaped transmission pieces are symmetrical about the vertical center plane of the endless band and are connected to each other at the base of the U.
The device according to claim 1, characterized in that it is composed of seven-figure piece pieces. 12 The two piece pieces each have a blind hole coaxially extending from the abutting surface at the bottom of the U of the transmission piece, and are combined into the transmission piece by a common pin that is press-fitted into each of these blind holes. The apparatus according to claim 11. 13. The device according to claim 9, characterized in that (3) the suspension member and the opposing plate are made of metal.