JPS6258417B2 - - Google Patents

Description

[Detailed Description of the Invention] Rubber V-belts have conventionally been used as driving endless belts that are used with pulleys, particularly pulleys of continuously variable transmissions, to transmit torque between a pair of pulleys. When durability and high torque transmission performance are required, an endless belt is being used in which a large number of plate-shaped metal blocks having a cross-sectional shape that crosses the V-belt are bound together with a metal band.

In this type of endless belt, the front shape of the metal block is the cross-sectional shape of the V-belt, that is, the width of the belt from the outer circumferential side to the inner circumferential side of the belt, which is to be in contact with the conical contact surface of the pulley, is on both side edges. It is a plate-shaped block with a trapezoidal shape with an inclined contact surface that reduces the width, and a thickness of about 1/4 to 1/10 of its maximum width. Recesses are formed from both side edges of the metal block so as to form a metal band support surface at a position on the outer side of approximately 1/2 of the distance to the edge, and the metal belts are respectively engaged in the recesses. A large number of the metal blocks are arranged in parallel in the thickness direction of the metal blocks and bound together,
It is known that the front and back surfaces of each metal block are tapered at a portion on the inner peripheral side of the metal band support surface, so that the metal block is allowed to curve in an arc shape around the rotation axis of the pulley. Kaisho 54−
(Refer to Publication No. 52253).

This type of belt has little wear and aging even after long-term use, and is suitable for high-torque transmission.Especially, each pulley has a pair of conical flanges that are always pushed close to each other by the elasticity of the spring. Also, one of the pair of pulleys is adapted to change the spacing between the conical flanges by the action of centrifugal force, and is particularly suitable for use in a continuously variable transmission in which a V-belt is stretched between both pulleys. However, since it simply consists of a large number of metal blocks arranged in parallel and a metal band engaged in the recess, the metal blocks may fall off from the metal band when passing them around a pulley after stitching. Due to the accuracy of the block and band and the unevenness of the frictional force between the inclined contact surfaces on the left and right end faces of the block and the frictional contact surface of the pulley, etc., the gap between the metal block and metal band is Skidding occurs, causing uneven wear and fatigue of the metal block and metal band, impairing efficiency, and in the worst case, there is a risk that the metal block may fall off from the metal band during operation.

The present invention aims to eliminate the above-mentioned defects by maintaining the relative position of the metal block and metal band normally during assembly and operation, and the metal block has a frontal shape that is in contact with the pulley. In addition to forming a trapezoidal shape in which inclined contact surfaces that come into contact with the surface are formed on part or all of both end surfaces,
The slit for receiving the metal band has a straight line whose extension lines intersect the inclined contact surfaces of both end faces at approximately equal angles, and the slit is bored so as to open only on one end face of the block. Similar to the metal block No. 1, the inclined contact surfaces that come into contact with the contact surfaces of the pulleys are formed on some or all of the end surfaces on both sides, and the front shape is formed at the center of the surface corresponding to the outer circumferential surface of the endless belt. is recessed into a substantially rectangular shape to form a support surface for the metal band at the same dimensional position as the inner peripheral side wall surface of the slit in the first metal block, and support ends are formed at both ends of the surface. a second metal block having a shape of a block body, and a rod-like member is removably bridged between the free ends of the supporting ends, and the space between the rod-like member and the band support surface is a space through which a metal band is inserted. and the thickness is equal to or less than the width of the slit of the first metal block, and the width is equal to or less than the spacing between the supporting ends of the second metal block. 1 or 2 of the second metal blocks are arranged for every plurality of the first metal blocks arranged in parallel, and these blocks are arranged in the thickness direction of the plate. The metal bands are arranged in parallel and inserted between the linear slit of the first metal block and the rod-like member of the second metal block and the band support surface, and these metal blocks are connected in an endless band shape.

The drawings show one embodiment of the present invention.
FIG. 1 shows a front view of a first metal block 1. FIG.
The metal block 1 has a trapezoidal front profile;
an inclined contact surface 3 having a part of both side edges in contact with a contact surface 2, 2 forming a conical surface of a pulley (not shown);
3, and when an endless belt is constructed, the surface constituting the inner circumferential surface is formed into a linear surface 4, the surface constituting the outer circumferential surface is formed into a polygonal outline, and the inclined contact surfaces 3, 3 are formed.
A slit 6 whose inner peripheral wall is the support surface 5 whose extension lines intersect at approximately the same angle is opened only on one side edge (the left side edge in FIG. 1). The lower half 7 on the inner peripheral side of the support surface 5 has one surface (the upper surface in FIG. 1) formed into a tapered surface 8, as is clear from the side view shown in FIG. The outer peripheral side of the support surface 5 is made of a plate-like material formed in an upper half part 9 of uniform thickness.

FIG. 2 shows a front view of the second metal block 11 of the present invention. In the front view, part of both side edges are inclined contact surfaces 13, 13 that contact the contact surfaces 2, 2 of the pulleys, When constructing an endless belt, the surface constituting the inner circumferential surface is made into a linear surface 14, and the surface constituting the outer circumferential surface is recessed in a substantially rectangular shape at the center, leaving support ends 12, 12 on both sides, and The block body is formed with a planar metal band support surface 15 formed at a substantially equal angle to the inclined contact surfaces 13, 13 on both side edges, and the supporting end portions 12, 12 have an equal thickness. One surface (the upper surface in FIG. 2) of the lower half 17 on the inner peripheral side of the support surface 15 is formed into a tapered surface 18 as clearly shown in the side view of FIG. The edge is formed into a straight surface 14 similar to that in FIG. Circular holes 19, 19 having axial centers in the width direction of the metal block 11 are bored in the free ends of the supporting end portions 12, 12, and both ends are tightly fitted into the circular holes 19, 19 to form one piece. A rod-shaped member 20 having a cylindrical peripheral surface shape is bridged so as to be detachable and not easily fall off.
0, the space 16 surrounded by the support surface 15 and the support ends 12, 12 is a space through which a metal band is inserted.

One surface of the upper half 9 of both metal blocks 1, 11 or one of the supporting ends 12 (the upper surface of FIGS. 1 and 2)
A truncated conical projection 21 is formed protrudingly at the same position both in the width direction and at the same height from the support surfaces 5 and 15, and is formed on the upper half 9 or the support end 12. A recess 22 is formed in the surface to receive and fit the protrusion 21 for positioning. Note that the arcuate portions formed at the intersections between the back wall of the slit 6 and the support wall 5 of the slit 6 in the metal block 1 and the intersections between the support wall 15 and the inner wall of the support end 12 in the metal block 11 are This is a concave part due to circumstances.

The metal band 30 is formed by stacking, for example, 10 endless metal bands, and the width of the slit 5 of the metal block 1 (the distance between the supporting surface 5 and the corresponding outer peripheral wall in FIG. 1) ), and its width is equal to or smaller than the distance between the inner walls of the supporting ends 12, 12 of the second metal block 11. It is.

In order to construct an endless belt for driving by the first metal block 1, second metal block 11, and metal band 30 having the above configuration, an appropriate number of second metal blocks 11 are prepared, and the rod-like member 20 is When the metal band 30 is removed from the circular hole 19 of the support end 12 and held on the support surface 15, and the rod-like member 20 is tightly fitted into the circular hole 19 again in this state, the second metal is attached to the metal band 30. Block 11 is locked. At this time, it goes without saying that the linear surface 14 of the metal block 11 should be locked so that it is located on the inner peripheral side of the metal band 30. Next, an appropriate number of the first metal blocks 1 in the range of 3 to 20 are locked between the second metal blocks 11 so that the metal bands 30 are inserted through the linear slits 6. Thus, over the entire length of the metal band 30, n pieces (n
is a positive integer from 3 to 20), one or two second metal blocks 11 are interposed, and the whole is connected to form an endless belt in the form of a V-belt.

The endless driving belt in which the second metal blocks 1 and 11 are connected in a row has the metal blocks 1 and 11 at key points.
1 is arranged, and the metal block 11 has a rod-like member 20, a support surface 15, a support end 12,
Since the metal band 30 is inserted into the space 16 surrounded by the second metal block 11, the metal band 30 is inserted into the space 16 surrounded by the second metal block 11 during the assembly of the endless driving belt to the pulley and during the torque transmission operation of the pulley. The first metal block 1 is held in the space 16 at approximately the center of the block and the first metal block 1 is held between the second metal block 11 and the metal block 1.
There is no risk of separation from the metal band 30 due to friction between each other and the metal band 30. The truncated conical projection 2 is formed on each metal block 1, 11.
1 and a recess 2 into which the protrusion 21 is received and fitted.
2, each metal block 1, 11 is regulated and aligned by fitting between the protrusion 21 and the recess. And each metal block 1,
11 curves the endless belt into an arc by tapered surfaces 8, 18 formed on the lower half parts 7, 17,
The drive travels in an arc shape centered on the rotation center axis of the pulley while bringing its both end surfaces into contact with the contact surfaces 2, 2 of the pulley. At this time, since the tapered surfaces are formed on the lower halves 7, 17 of the metal blocks 1, 11 with the metal band support surfaces 5, 15 as boundaries, the metal band 30 is curved along the support surfaces 5, 15. , the inclined contact surfaces 3 and 13 are connected to the pulley contact surface 2,
2 to ensure contact with the pulley.

In the present invention, the endless driving belt has inclined contact surfaces that come into contact with the contact surfaces of the pulleys formed on part or all of both side edges, and a linear slit into which the metal band is inserted is formed on one side edge. a first metal block having an opening only at the periphery; and the inclined contact surfaces are formed on part or all of the edges on both sides, and when forming an endless belt, the center portion of the surface corresponding to the outer peripheral surface is approximately rectangular. A second metal block having a U-shaped block body formed by recessing and forming support ends on both sides thereof, and a rod-like member removably bridged between the support ends, and the first metal block. an endless metal band having a thickness equal to or less than the width of the slit in the block and a width equal to or less than the spacing between the inner walls of the supporting end of said second metal block; Therefore, these blocks are arranged in parallel in the plate thickness direction so that one or two second metal blocks are arranged for every plurality (for example, 3 to 20) of the first metal blocks, and the metal band is inserted into the linear slit of the first metal block and the inside of the rod-like member of the second metal block, and these metal blocks are connected together, so the second metal block has an endless belt. During assembly to the pulley and while the pulley is being driven by torque transmission, the metal band is held in the space surrounded by the support end and the rod-like member, and a plurality of the first metal blocks are held between the metal blocks. The friction between the first metal block and the metal band prevents the first metal block from falling off, and the second metal block holds the metal band at the center in the width direction of the metal block, especially during torque transmission driving. Therefore, even if the first metal block receives an uneven load on the left and right sides due to contact with the pulley, it is possible to prevent the first metal block from falling off from the metal band.

In the present invention, when assembling the second metal block and the metal band, the rod-shaped member is removed from the block body, the metal band is positioned in the recessed part of the block body, and then the rod-shaped member is assembled into the block body. Although it takes time and effort to bridge the support end, the first metal block and the metal band can be assembled by an extremely simple method that only requires the metal band to be engaged with the linear slit of the first metal block. I can,
Moreover, the number of metal blocks is a plurality of the first metal blocks (3 to 20, preferably 8 to 20).
It is sufficient to have one second metal block for every 15 pieces, and the presence of the second metal block prevents the first metal block from falling off during assembly to the pulley or during torque transmission drive. It has the feature of significantly reducing the amount of assembly required, and this feature has a great practical effect that more than compensates for the trouble during assembly.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view of the first metal block, FIG. 2 is a front view of the second metal block, and FIG. 3 is a front view of the first and second metal blocks.
FIG. 4 is a side view of a portion of an endless belt made of connected metal blocks, and FIG. 4 is an exploded perspective view thereof. In the figure, 1 is a first metal block, 11 is a second metal block, 3 and 13 are inclined contact surfaces, 5,
15 is a metal band support surface, 8 and 18 are tapered surfaces,
6 is a linear slit, 16 is a space for inserting a metal band, 19 is a circular hole, 20 is a rod-shaped member, 21 is a protrusion, 22 is a recess, 30 is a metal band, and 2 is a contact surface of a pulley. It is something.

Claims (1)

[Claims] 1. For transmitting torque between a pair of pulleys having contact surfaces formed by opposing two conical surfaces, a part or all of both side surfaces are in contact with the contact surfaces of the pulleys. An endless drive belt comprising a plurality of trapezoidal metal blocks each having an inclined contact surface, which are connected together by a metal band, wherein the trapezoidal belt has inclined contact surfaces that come into contact with the contact surfaces of the pulleys formed on part or all of both end faces. A plate having a predetermined thickness, which has a frontal shape and has a linear slit whose extension lines intersect at substantially equal angles with the inclined contact surfaces of the both end faces, and which is opened only on the one end face. a first metal block having a first metal block; and inclined contact surfaces that come into contact with the contact surfaces of the pulleys are formed on part or all of both end surfaces, and the front shape is made such that the central part of the surface corresponding to the outer circumferential surface of the endless belt is approximately rectangular. A second plate having a predetermined thickness is formed by recessing the U-shaped block body and forming support ends on both sides, and a rod-like member is removably bridged between the support ends on both sides. a metal block having a thickness equal to or less than the width of the straight slit of the first metal block and equal to or less than the spacing between the supporting ends of the second metal block; The metal blocks are arranged in parallel in the plate thickness direction so that one or two second metal blocks are arranged for every plurality of the first metal blocks. An endless belt for driving, characterized in that a band is inserted into the linear slit of the first metal block and inside the rod-like member of the second metal block, so that these metal blocks are connected together. 2. The second metal block has a top surface located at the same dimensional position as a surface of the linear slit of the first metal block located inward of the endless belt with respect to the inclined contact surfaces of both end surfaces. The endless belt for driving according to claim 1, characterized in that a rectangular concave portion is carved. 3. The second metal block is characterized in that a rod-like member having a substantially cylindrical surface is tightly fitted into a circular hole provided in the supporting end portion to form a bridge. The endless belt for driving according to item 1 or 2. 4 The upper half of the first metal block and the second
The supporting end of the metal block is provided with a protrusion at the same position on the front surface thereof, and the rear surface thereof is provided with a recess into which the protrusion is received and fitted. The endless belt for driving according to item 2.