JPS61127944A - Transmission belt - Google Patents

Abstract

PURPOSE:To keep off a positional slip of a hoop as well as to improve durability in the hoop, by forming an inner wall surface at the outer circumferential side of the inside of a slot of a block, into a concave form, while making an on-position of the hoop to the block so as to be corrected. CONSTITUTION:Inner wall surfaces 54 and 54 at the side of head part 40 forming an inner wall surface at the outer circumferential side of slots 52 and 52 formed out of both side parts of a block 50 are formed into concavities being concaved to the outer circumferential side as far as the central part in a width direction. When hoops 26 and 26 are pressed to these concavities, these hoops 26 and 26 are led into the central part owing to action of these concavities, whereby the position is corrected so as to be the center. Therefore, a lowering of durability in these hoops caused by these phenomena that these hoops 26 and 26 slip sideward, coming into contact with a side plate 22 of a V-pulley and the block, and notches including burrs and the like are produced there are all prevented from occurring.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to (1) a transmission belt that is wound between pulleys to transmit power, and particularly relates to an endless annular hoop and a large number of blocks arranged one above the other along the hoop. The present invention relates to an improvement of a transmission belt having the following characteristics.

Prior Art An endless annular hoop and a slot having a pair of inner wall surfaces on the outer circumferential side and inner circumferential side facing the outer circumferential surface and the inner circumferential surface of the hoop, respectively, are provided, and the slots are stacked along the hoop. Including a large number of blocks connected,
A transmission belt is known that is wound between V-pulleys to transmit power.

For example, a conduction heald 10 shown in FIG. 6 is one example, and is used as a belt for a continuously variable transmission.

In the figure, an input side rotating shaft 12 and an output side rotating shaft 14
V-pulleys 16 and 18 are attached to these pulleys 916 and 18, respectively, and a conduction belt 10 is wound between these pulleys 916 and 18. ■The pulleys 16.18 each have a pair of side plates 20.20 and 22.22;
2 are provided with respectively opposite conical surfaces 24, 24, as can be seen in FIG. Therefore, by changing the distance between the pair of side plates 20, 20 and 22, 22, the groove width of the groove formed between the conical surfaces 24, 24, that is, the diameter of the conduction belt 10, can be changed, and The rotation of the rotating shaft 12 is transmitted to the output rotating shaft 14 in a stepless manner.

The conductive bell 1-10 includes a pair of endless annular hoops 26.26 provided in parallel with each other, and the hoops 26.26.
It is provided with a large number of blocks 28, 28, . The hoop 26 is made up of multiple layers of very thin flexible metal sheets 30, 30, etc., and has a predetermined thickness. In addition, the block 28 is made of metal, as shown separately in FIG.
The main body part 34 has a rectangular plate shape made of a highly rigid material such as ceramic, and has tapered side surfaces 32.32 that slide into the V groove between the conical surfaces 24.24, and a slot from both sides. 36.36 is formed symmetrically to make the neck portion 38 narrow, and the head portion 40 is connected to the main body portion 34 by the neck portion 38.

And hoop 26.2 in slot 36.36 respectively.
6 is inserted, the block 28 is attached to the pair of hoops 26, 26 with its head 40 located on the outer circumferential side of the hoops 26. slot 36
．． The inner wall surfaces 42, 42 on the head 40 side of the hoop 26.
The inner wall surface on the outer circumferential side facing the outer circumferential surface 44 of the hoop 26 is formed, and the inner wall surface 46 on the main body part 34 side is
．． It forms an inner wall surface on the inner circumferential side opposite to the inner circumferential surface 48, 48 of 26. Note that a predetermined tension is applied to the hoop 26, 26 by attaching a large number of blocks 28, and the inner peripheral surface 48, 48 of the hoop 26, 26 is brought into sliding contact with the inner wall surface 4646.

In the transmission belt 10 configured in this way, for example, when the input side rotating shaft 12 is rotated in the clockwise direction indicated by the arrow in FIG. A number of blocks 28.28.16 are continuously pushed out from the block 28.28. . . . ■Pulley 18 and output side rotating shaft 14
Rotate clockwise. Then, the block 28 located at the part wrapped around the pulley 18 transmits the rotating torque to the pulley 18, and then the block 28, which is located at the part wrapped around the pulley 18, controls the rotation of the pulley 18 due to the frictional force between the side surface 32.32 and the conical surface 24.24. 2) and is discharged from the pulley 18.

On the other hand, the hoop 26 of the conduction belt 10 is moved toward its outer circumference by moving the metal sheet 30 located at its innermost circumference with the movement of the block 28 due to the frictional force between it and the inner wall surface 46. A large number of metal sheets 3 located
0.30... are also moved in the same direction as the innermost metal sheet 30 due to the frictional force between them, and eventually the hoop 26 as a whole is moved in the same direction together with the block 28. Therefore, the above ■pulley 18
The block 28 discharged from the hoop 26, ie, the block 28 located at the bottom in FIG. 6, is moved toward the pulley 16 while being suspended from the hoop 26.

Here, the groove width of the ■ groove of the pulley 16 and the v of the V pulley 18 are
When changing gears with different groove widths, the diameters of the transmission belts 10 wound around the pulleys 16 and 18 also differ. In such a case, the frictional force between the transmission belt 10 and the block 28 on the side with the larger hanging diameter is greater than the frictional force on the side with the smaller hanging diameter, so the transmission belt on the side with the smaller hanging diameter 10 and the block 28 and between each metal sear 1-30.

That is, for example, as shown in FIG. 6, when the hook diameter on the V-pulley 16 side is small and the hook diameter on the V-pulley 18 side is large, the gap between the hoop 26 and the block 28 when measuring the pulley 18 is The hoop 26 moves integrally with the block 28 without any relative sliding. It is moved while causing sliding.

In this way, during the operation of the continuously variable transmission, the transmission belt 10 undergoes a slight relative sliding movement between its hoops 26.26 and blocks 28.28. Since stresses such as bending force and tensile force are acting on the hoop 26, the hoop 26°26 is not only moved relative to each other in the direction of movement of the block 28, but also moved in a direction perpendicular to the direction of movement, that is, in the width direction. If this accumulates, the side end portion of the hoop 26 will come into contact with the neck portion 38 of the block 28 and the conical surface 24, causing a cutout such as a burr, which may impair the durability of the transmission belt. For this reason, the inner wall surface 46 of the block 28 is made into a convex surface that protrudes toward the outer circumferential side toward the center in the width direction, as shown in FIG.
By increasing the frictional force between the inner wall surface 46 and the inner circumferential surface 48 of the hoop 26 toward the center in the width direction, and by increasing the circumferential speed of the hoop 26 toward the center in the width direction, the inner wall surface 46
The hanging position of the hoop 26 in the width direction of the hoop 26 is corrected. Incidentally, such a conductive heald 10 is disclosed in, for example, Japanese Patent Laid-Open No. 52-47158.

Problems to be Solved by the Invention However, in the conventional transmission belt 10,
Since the hanging position of the hoop 26 is corrected based on the frictional force between the inner wall surface 46 of the block 28 and the inner circumferential surface 48 of the hoop 26, the tension of the hoop 26 is relatively small and sufficient frictional force is generated. If the hoop 26 is used in a manner that does not allow the above-mentioned frictional force to be lowered, or if the inner circumferential surface 48 of the hoop 26 is worn down due to changes over time and the above-mentioned frictional force is reduced, the hoop 26 may
It slides in the width direction along the convex surface. In addition, such a reduction in frictional force also occurs between each of the metal sheets 30, 30 of the hoop 26, and in particular, the metal sheets 30 located on the outer periphery side where the shared tension is small. As the width increases, the movement in the width direction becomes more pronounced. When the hoop 26 moves in the width direction in this manner, the side end portions of the hoop 26 come into contact with the neck portion 38 and the conical surface 24 as described above, shortening its lifespan.

Means for Solving the Problems The present invention has been made to solve such problems, and its gist is that the endless annular hoop and each slot are fitted into the hoop. As a result, in a conductive belt that includes a large number of blocks that are stacked and arranged in series along the hoop, a central portion in the width direction of the conductive belt is formed on the inner circumferential surface of the outer peripheral side of the slot. This is because a concave surface is formed that is concave toward the outer circumference.

Function: In such a transmission belt, when one of the pulleys around which the transmission heddle is wound is driven to rotate, the
A block is pushed out from the boob, and its thrust is transmitted through a series of blocks, causing the other V-boo to rotate. At this time, the hoop is moved substantially integrally with the block due to the frictional force between the inner peripheral surface of the hoop and the inner wall surface on the inner peripheral side of the block.

On the other hand, the flocs that have transmitted rotational torque to the other pulley are then moved as the pulley rotates based on the frictional force with the V-pulley, and are ejected from the pulley. Since the block is in a state of being squeezed in the ■groove of the pulley, the block remains in the V
Try to move around the pulley. On the other hand, since the hoop tries to move along the common tangent line connecting the blocks, its outer circumferential surface is pressed against the inner wall surface on the outer circumferential side of the block, and the block moves based on the tension of this hoop. It is pulled out from the pulley. When the hoop is pressed against the inner wall surface on the outer circumference side of the block in this way, the inner wall surface on the outer circumference side is a concave surface that is concave toward the outer circumference toward the center, so the hoop pushes against the center of the concave surface due to its own tension. The position of the hoop in the width direction of the slot is corrected.

EXAMPLES Hereinafter, some embodiments of the present invention will be described in detail based on the drawings. In the following description, parts common to those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

The block 50 shown in FIG.
The inner wall surface 54.54 of the 40 heads, which is the inner wall surface on the outer circumferential side of -52.52, is a concave surface that is concave toward the outer circumferential side toward the center in the width direction, while the main body portion 34, which is the inner wall surface on the inner circumferential side The difference is that the side inner wall surface 56°56 is a flat surface.

The slots 52.52 are provided symmetrically with respect to the center line S of the block 50, and are located at the center of curvature 0 of the inner wall surface 54.54.
．． , O□ and the center line S are also equal in distance 1t, , lyu.

Such blocks 50, 50... are connected to the hoop 26
．． A transmission belt arranged in series along 26 is wound between the V pulleys 16 and 18 of the continuously variable transmission shown in FIG.
When the drive side rotating shaft 12 is rotationally driven in the clockwise direction indicated by the arrow, the block 50 is pushed out from the pulley 16 and transmits rotational torque to the other pulley 18, and the output side rotating shaft 14 is rotated at a predetermined gear ratio. As mentioned above, it can be rotated. Thereafter, the block 50 is moved together with the pulley 18, and when it reaches the bottom of the pulley 18 in FIG.
．． The block 50 is moved toward the ■ pulley 16 while being suspended from the ■ pulley 16 .
The pulley 18 is pinched between the pair of side plates 22.22, and no compressive force is applied between the front and rear blocks 50.50, and there is a slight relative displacement between the blocks 50.50. is allowed, so block 50
attempts to rotate around the pulley 18. On the other hand, hoop 26.26 is ■Pulley 18 and ■Boo IJ1
At this time, the hoop 26.26 and the block 50 are moved along a common tangent line connecting them to the block 50, so that the hoop 26.26 is moved along the inner wall surface 54. The block 50 is now pressed against the pulley 1 based on the tension of the hoop 26.
Pulled out from 8.

Here, the block 5 against which the hoop 26.26 is pressed
Since the inner wall surface 54.54 of the hoop 26.0 is a concave surface that is concave toward the outer circumference toward the center, each of the metal seams 1-30.30. ... are each guided to the center of the inner wall surface 54° 54 by the action of the concave surface of the inner wall surface 54,
As a result, the hooking positions of the hoops 26, 26 relative to the slots 52, 52 are modified so that they are in the center of the respective inner wall surfaces 54, 54.

Note that the radius of curvature r + rl of the inner wall surface 54.54 is
If this is too small, the amount of deformation of the hoop 26.26 will increase and its durability will be impaired, while if it is too large, it will not be possible to guide the hoop 26.26 along the concave surface. 26.26 to the center of the inner wall surface 54.54.
It is desirable to set it to 00 am.

In this way, according to the transmission belt having the blocks 5Q, 50, . , between the hoop 26.26 and the inner wall surface 56.56, or each metal seam of the hoop 26)30.
30... Even if the frictional force generated between the hoop 26 and the concave inner circumferential inner wall surface decreases due to changes over time, or even if the continuously variable transmission is operated under operating conditions where such frictional force is small, Hoop 26.26 suloso 1- for every contact with 54
The hooking position for 52.52 is modified and maintained at its center. Therefore, the side portions of the hoops 26, 26 do not come into contact with the neck 38 of the block 50 or the conical surfaces 24, 24 of the pulleys 16, 18, thereby greatly improving their lifespan.

On the other hand, in the conduction heald 10 equipped with the conventional block 28, the inner wall surface 42.42 is substantially flat, so that the hoop 26.26 as shown in FIG.
Therefore, even when the block 28 is pulled out from the pulley 18, the effect of guiding the hoop 26.degree. 26 to the center of the slot 36.36 cannot be obtained. For this reason, 4, the inner wall surface 46.
Slot 36.3 of hoop 26.26 with 46 as convex surface
Even if the hanging position for 6 is corrected, those inner wall surfaces 4
When the frictional force between 6.46 and the hoop 26.26 decreases due to changes over time, the hoops 26, 26
．． 46, and if the frictional force between the metal sheets 30, 30... of the hoop 26 decreases, they will similarly slide in the width direction. .

In addition, in the above embodiment, the inner wall surface 56,56 of the slot 52
is a flat surface, but as shown in FIG. 3, if the inner wall surface 56.56 is a convex surface that protrudes toward the outer circumference toward the center as in the conventional example, the inner wall surface 56.56 is a flat surface. 56
Since the hanging position of the hoop 26.26 is corrected based on the frictional force between the hoop 26.26 and the inner peripheral surface 48.48 of the hoop 26.26,
Coupled with the action of correcting the hooking position by the concave surface formed on the inner wall surface 54; 54, the hooking position of the hoop 26, 26 can be corrected more effectively. In this case, the inner wall surface 5
It is desirable that the correction position due to the action of 4.54 and the correction position due to the action of the inner wall surface 56.56 substantially match in order to move the hoop 26.26 smoothly.
．． The center of curvature of the convex surface formed at 56 02.0□ and the center line S
Distance with β2. The distance 21 is set to be approximately the same as the distance 21.

Further, the block 50 of the above embodiment includes a pair of slots 1-
52, 52 are formed to fit into the hoops 26, 26, respectively, whereas the blocks 60, 62 shown in FIGS. There is no problem even if only 66 is provided and it can be attached to one hoop.

Although several embodiments of the present invention have been described above in detail based on the drawings, the present invention can also be implemented in other embodiments.

For example, in the embodiments described above, the present invention is applied to a transmission belt for a continuously variable transmission, but the present invention can be similarly applied to other transmission belts for power transmission.

Further, in the above embodiment, the hoop 26 is made up of a large number of metal sheets 30, 3'0, etc., but it may be made of a single layer metal hoop, and the material may be metal. In addition, it may be made of resin, or may be made of metal or resin fibers.

Although other examples will not be given, it goes without saying that the present invention may be practiced with various modifications and improvements based on the knowledge of those skilled in the art, without departing from its spirit.

Effects of the Invention As detailed above, according to the transmission belt according to the present invention, the hooking position of the hoop with respect to the block is corrected based on the contact action between the hoop and the concave inner wall surface of the slot. Therefore, even if the frictional force between the hoop and the block decreases due to changes over time, the effect of correcting the hanging position of the hoop will not be impaired. Therefore, the durability of the hoop is prevented from being lowered due to the side ends of the hoop coming into contact with blocks and holes, causing notches such as holes, and the service life of the transmission belt is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a block of a conductive belt according to an embodiment of the present invention. FIG. 2 is a sectional view showing the block shown in FIG. 1 being pulled out from the V-pulley. 3 to 5 are front views of blocks according to other embodiments of the present invention, respectively. FIG. 6 is a partially cutaway front view showing a conventional transmission belt wound between a pair of pulleys. Figure 7 shows that the block of the transmission belt in Figure 6 is ■V of the pulley.
It is a sectional view showing a state where it is fitted in a. Figure 8 is the 6th
FIG. 2 is a front view showing the block of the conductive heald shown in the figure, and corresponds to FIG. 1; FIG. 9 is a sectional view showing the block shown in FIG. 8 being pulled from the V-pulley, and corresponds to FIG. 2. 16.18: V pulley 26: Hoop 44: Outer circumferential surface 48: Inner circumferential surface 50, 60. Applicant: Toyota Motor Corporation Figure 2 5 q^ Figure 4 Figure 5 Figure 6 Figure 9

Claims (3)

[Claims] (1) A state in which an endless annular hoop and a slot having a pair of outer circumferential inner wall surfaces and inner circumferential inner wall surfaces facing the outer circumferential surface and inner circumferential surface of the hoop, respectively, are provided and are stacked along the hoop. In a transmission belt that is wound between V-pulleys and transmits power, the slot includes a concave surface that is recessed toward the outer circumference toward the center in the width direction of the transmission belt. A conductive belt characterized by forming. (2) The inner wall surface on the outer peripheral side of the slot is 50 to 1000
The conductive belt according to claim 1, which has a concave surface formed with a radius of curvature of mm. (3) The inner peripheral wall surface of the slot is a convex surface with a curvature centered at approximately the same position in the width direction of the conductive belt as the center of curvature of the concave surface. Transmission belt as described in section.