JPH0765641B2 - Block for transmission belt - Google Patents

Description

TECHNICAL FIELD The present invention relates to a block for a transmission belt used in a continuously variable transmission or the like.

[Conventional technology]

Belts for continuously variable transmissions used in automobile power transmission systems,
A so-called CVT belt is stretched between a driving side pulley 1 and a driven side pulley 2 to change the radius of the contact position between the pulleys 1 and 2 and the belt 3 as illustrated in FIG. To obtain an arbitrary gear ratio.
The belt 3 of this type is composed of an endless carrier band 4 made of a thin metal plate having a multilayer structure and a large number of blocks 5 stacked in the length direction of the carrier band 4.
Power is transmitted via the.

In a conventional block, for example, like a transmission v-belt disclosed in Japanese Patent Application Laid-Open No. 58-81252, a pair of left and right taper surfaces contacting the slopes of the V-shaped groove of the pulley are slidably contacted with a carrier band. It has a band engaging surface. Further, in this prior art, a protrusion along the entire width direction of the block is provided on one surface side in the thickness direction of the block, and a recess along the entire width direction of the block is provided at a position corresponding to the above-mentioned protrusion on the other surface side. It is shown that the heights of the blocks are made uniform by fitting the projections and the recesses with each other.

[Problems to be solved by the invention]

The above-described block of the related art can restrict the movement of the blocks in the height direction but cannot restrict the movement of the blocks in the width direction. Further, it is not possible to sufficiently prevent the blocks from rotating about an axis parallel to the traveling direction of the block and about an axis parallel to the height direction of the block. For this reason,
If the positions of the blocks are displaced or rotated relative to each other for some reason, the linearity of the belt may be lost between or on the pulleys, and the belt may run in a meandering manner, which may adversely affect durability and the like.

In addition, the block has a neck projecting above the band hanging surface and a head continuing to the neck, and the neck is quite thin, but when the block goes over the pulley, the blocks are adjacent to each other. Since the heads are separated from each other, a small bending rigidity of the neck causes the head to vibrate.

Therefore, an object of the present invention is to prevent the blocks from moving in parallel with each other during traveling of the belt and to prevent problems such as tilting in an irregular direction, and to increase the bending rigidity of the neck and the like. It is in.

[Means for solving problems]

To achieve the above object, the present invention provides a block main body portion 7 having a pair of left and right tapered surfaces 6 contacting the slopes of the V-shaped grooves of the pulleys 1 and 2 and a band hanging surface 10 contacting the carrier band 4, and a band hanging surface 10. In a transmission belt block 5 having a neck portion 8 protruding from the head portion 8 and a head portion 9 connected to the neck portion 8 and being used by stacking a large number in the length direction of the carrier band 4, one surface in the thickness direction of the block 5 On the side, a portion 11a formed of portions 11a, 11b along the width direction and the height direction of the block 5 and a portion 11b along the height direction passes through the neck portion 8 and is a portion 11a along the width direction at the center of the block body portion 7 in the width direction. A cross-shaped convex portion 11 that intersects with the cross-shaped groove 11 is provided, and a cross-shaped groove 12 that can be fitted to the convex portion 11 of the adjacent block is provided on the other surface side of the block 5 at a position corresponding to the above-mentioned convex portion 11. It is a thing.

[Action]

In the block having the above structure, the tapered surfaces are in contact with the pulleys, respectively, and the carrier band passes on the band hanging surface of the block body, and the carrier band travels integrally with the block. However, the block and the carrier band can slide on each other.

In the above block, since the cross-shaped convex portion and the groove are fitted to each other by the things adjacent to each other in the front and back, the blocks move in parallel in the width direction or the height direction, or the axis parallel to the moving direction of the block. Rotation in the rotation direction, rotation about an axis parallel to the height direction of the block, rotation about an axis parallel to the width direction, and the like are sufficiently restricted by fitting the cross-shaped convex portion and the groove.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. The belt block 5 of this embodiment is used in a state in which a large number of blocks are stacked in the thickness direction as in the conventional case.
As the material of the block 5, cermet, ceramics or the like can be applied in addition to the iron-based metal. The carrier band 4 (shown in FIG. 3) may be the same as the conventional one and has a multi-layer structure in which a plurality of thin endless strip-shaped steel plates are stacked in the thickness direction. The block 5 can freely slide on the carrier band 4.

The block 5 has a block main body 7 having a pair of left and right tapered surfaces 6 in contact with the slopes of the V-shaped grooves of the pulleys 1 and 2, a neck 8 projecting upward from the block main body 7, and a neck 8 of the block 8. And a head portion 9 which is continuous with.
Further, band hanging surfaces 10 are provided on the upper surface side of the block main body portion 7 in the figure, on both left and right sides of the neck portion 8. The carrier band 4 slidably contacts the band hanging surface 10. The block body 7 has a taper shape such that its lower side is slightly tapered in a side view (FIG. 5).
With such a tapered shape, it is possible to cope with the curvature when the block 5 passes over the pulleys 1 and 2.

On the one side in the thickness direction of the block 5, that is, on the front side in the traveling direction of the block 5, a cross-shaped convex portion when viewed from the front direction.
11 are provided. The convex portion 11 includes a portion 11a along the width direction of the block 5 and a portion 11b along the height direction,
The front end, that is, the ridge portion of the convex portion 11 is sharpened in a so-called knife edge shape.

Further, on the back surface side of the block 5, a groove 12 which is also formed in a cross shape is provided. The groove 12 is provided at a position corresponding to the convex portion 11, and the convex portion 11 of the block on the rear side adjacent to the block 5 can be fitted therein.

The groove 12 includes a portion 12a along the width direction of the block 5 and a portion 12b along the height direction. The cross section of the groove 12 is V-shaped, and the groove bottom is sharp. Further, as shown in FIG. 5, by making the inclination angle θ ₂ on the lower surface side of the portion 12a along the width direction of the groove 12 larger than the inclination angle θ _{1 of the} lower surface of the convex portion, the block 5 is moved to the pulley 1 The block 5 does not prevent the block 5 from tilting in the normal direction when passing over the above-mentioned components. The surface layer of the block 5 may be subjected to an appropriate surface treatment such as carburizing or nitriding treatment and TiC or TiN coating.

The transmission belt 3 including the block 5 having the above-described configuration is stretched between the pulleys 1 and 2 as in the conventional belt. The left and right taper surfaces 6 of the block body 7 are respectively pulleys 1,
Touch the slope of the V-shaped groove of 2. Further, the carrier band 4 passes over the band hanging surface 10, and the carrier band 4 travels together with the blocks 5 as the pulleys 1 and 2 rotate.

In each block 5, the cross-shaped convex portion 11 and the groove 12 are fitted to each other in a mutually adjacent manner. Therefore, the movement of the block 5 in the height direction (the movement in the arrow Z direction in FIG. 3)
Or rotation about an axis parallel to the traveling direction of the block 5 (fourth
The rotation about the xx axis in the drawing) and the rotation about the axis parallel to the width direction of the block 5 (the rotation about the Y axis in FIG. 3) are performed by the portion 11a and the groove along the width direction of the convex portion 11. It is regulated by the portion 11a along the width direction of 12. Further, in the straight running portion between the pulleys 1 and 2, the movement of the block 5 in the width direction (the third
(In the figure, movement in the direction of arrow Y) and a force about to rotate around an axis (xx axis in FIG. 4) parallel to the traveling direction of the block 5 and an axis parallel to the height direction of the block 5 (first axis). Three
With respect to a force to rotate about the Z-axis in the drawing), portions of the portions 11b, 12b along the height direction above the center Q are engaged with each other, so that the parallel movement in the above direction and Rotation is restricted. On the pulleys 1 and 2, the portions of the portions 11b and 12b along the height direction, which are lower than the center Q, are fitted to each other, so that the block 5 moves in the width direction and the block 5 moves in the parallel direction. Rotation about a certain axis and rotation about an axis parallel to the height direction of the block 5 are restricted.

In this way, the linearity of the belt 3 between the pulleys 1 and 2 and on the pulleys 1 and 2 is maintained. On the pulleys 1 and 2, the block 5 tilts in the front-rear direction as shown in FIG. That is, the block 5 rotates in the above direction around the contact point (center Q) between the tip of the convex portion 11 and the rear end of the groove 12. In this case, the vertical bisector H of the straight line 1 connecting the two contact points in front and rear does not coincide with the block center line C that bisects the plate thickness of the block 5, so that the block 5 is located at the rotation center o of the pulley. On the other hand, a slight inclination occurs. However, the protrusion 11
If you regulate even the position of the tip of and the back end of the groove 12,
The slight unevenness of the shapes of the convex portion 11 and the groove 12 is eliminated by the fitting play between the convex portion 11 and the groove 12.

Incidentally, FIG. 7 shows a second embodiment of the present invention. in this case,
The tip (ridge) of the convex portion 11 is rounded, and the deep end (groove bottom) of the groove 12 is also rounded. By doing so, it is possible to reduce the surface pressure of the contact portion between the convex portion 11 and the groove 12 and reduce the deformation due to wear.

Further, in the block 5 of the third embodiment shown in FIGS. 8 and 9, at least portions 11a and 12a of the cross-shaped convex portion 11 and the groove 12 along the width direction are formed in a semi-cylindrical shape and a semi-cylindrical shape, respectively. It is molded into. The above-mentioned portion 12a of the groove 12 has an inner diameter corresponding to the outer diameter of the semi-cylindrical portion 11a so that the above-mentioned portion 11a of the convex portion 11 can be fitted exactly. Therefore, in this embodiment, the portions 11a, 12a along the width direction rotate around the central axis of the cylinder. Therefore, the vertical bisector H of the line segment 1 connecting the two front and rear rotation centers P, P coincides with the block center line C, and when the block 5 rotates on the pulley, the block 5 faces the center o of the pulley. be able to. That is, the block center line C passes through the rotation center o of the pulley. Further, since the semi-cylindrical convex portion 11 and the semi-cylindrical concave groove 12 are in contact with each other, the contact area can be made large and abrasion is less likely to occur.

FIG. 10 shows a fourth embodiment of the present invention. In the block 5 of this embodiment, of the cross-shaped convex portion 11 and the groove 12, the portions 11b and 12b along the height direction are formed in a rectangular parallelepiped shape and a rectangular parallelepiped concave shape, respectively. Then, the upper portion 12b of the groove 12 has a width,
The width and depth correspond to both height. For this reason,
Both on the pulley and in the straight running section between the pulleys,
Even if there is a gap between the blocks as shown in FIG. 11, if the gap is equal to or less than the protruding height of the convex portion 11b,
The effect of restricting the movement of the block 5 in the width direction, the rotation about the axis parallel to the traveling direction of the block 5, and the rotation about the axis parallel to the height direction of the block 5 is maintained.

Further, as in the fifth embodiment of the present invention shown in FIG. 12,
The block 5 may have a plate thickness smaller than that of each of the embodiments. Even if the plate thickness is thin as described above, the cross-shaped convex portion 11 serves as a reinforcing rib, so that a predetermined strength can be secured.

〔The invention's effect〕

According to the present invention, the blocks can be prevented from translating or rotating in a direction other than the normal direction between the pulleys or on the pulleys, which is very effective in maintaining the mutual postures of the blocks. Moreover, since the bending rigidity of the entire block can be increased by providing the cross-shaped convex portion, and the bending rigidity of the neck portion can be increased by the portion along the height direction of the convex portion, the neck portion can be made thin. Also has the effect of suppressing vibration on the head side.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention.
The figure is a perspective view of the block viewed from one side, FIG. 2 is a perspective view of the block viewed from the other side, FIG. 3 is a front view of the block, FIG. 4 is a plan view of the block, and FIG. 5 is a side view. Figure, 6th
FIG. 7 is a sectional view showing a state when rotating on a pulley, FIG. 7 is a side view of a block showing a second embodiment of the present invention, and FIG. 8 is a side view of a block showing a third embodiment of the present invention. FIG. 9 is a sectional view showing a state in which the block shown in FIG. 8 rotates on a pulley, FIG. 10 is a plan view of a block showing a fourth embodiment of the present invention, and FIG. 11 is FIG. Fig. 12 is a cross-sectional view of the blocks shown in Fig. 1 in an overlapping state, Fig. 12 is a perspective view of the block showing the fifth embodiment of the present invention, and Fig. 13 is a side view conceptually showing the relationship between the belt and the pulley. . 1,2 ... Pulley, 3 ... Transmission belt, 4 ... Carrier band, 5 ... Block, 6 ... Tapered surface, 11 ... Convex part,
11a ... A portion along the width direction, 11b ... A portion along the height direction, 12 ... A groove, 12a ... A portion along the width direction, 12b ... A portion along the height direction.

Claims (2)

[Claims] 1. A block main body having a pair of left and right tapered surfaces in contact with a slope of a V-shaped groove of a pulley and a band hooking surface in contact with a carrier band, a neck protruding from the band hooking surface, and a head continuing to the neck. A block for a transmission belt which has a plurality of layers and is used in the length direction of a carrier band, wherein one side in the thickness direction of each of the blocks extends along the width direction of the block and along the height direction. And a cross-shaped convex portion that intersects the portion along the width direction at the center in the width direction of the block main body that passes through the neck portion and that is formed on the other surface side of the block. Is a block for a power transmission belt, which is provided with a cross-shaped groove that can be fitted to the convex portion of an adjacent block at a position corresponding to the convex portion. 2. At least a portion of the convex portion along the width direction of the block has a semi-cylindrical shape, and at least a portion of the groove along the width direction of the block has a semi-cylindrical concave shape. The transmission belt block according to claim (1), characterized in that the two are fitted to each other so as to be rotatable about the central axis of the cylinder.