JPS61236945A - Block for v-belt - Google Patents

Abstract

PURPOSE:To elongate the life of a belt by providing a roller rotatable about the width-wise shaft of a block body between the block body and a belt element. CONSTITUTION:A block body 10 is provided on both widthwise sides with V-shaped tapered surfaces 18, 19 contacting the inner surfaces of pulleys 5, 6. Also, the block body 10 is formed on the belt element 2 side with a widthwise fitting groove 20. A roller 11 is fitted and held in the fitting groove 20 rotatably about the widthwise shaft of the block body 10. The roller 11 is cylindrical so that it fits precisely the fitting groove 20 having the semicircular section on the bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a block for a V-belt used in a V-belt for power transmission.

[Conventional technology]

For example, a V-belt used in continuously variable transmissions of automobiles, etc., has a plurality of belt elements 2 (approximately 10 to 20) in the shape of an endless belt, such as the transmission V-belt 1 shown in FIG.
are stacked in the thickness direction, and a large number of V-shaped blocks i' (only some of which are shown) are stacked in the longitudinal direction of the belt element 2 so that they can be grooved relative to each other. These belt elements 2 and blocks 3' are generally made of metal.

The V-belt 1 is stretched between a pair of pulleys 5 and 6 having a fixed center distance, and power is transmitted through each block 3'. Each pulley 5, 6 includes a pair of conical plates 5h facing each other, as shown in FIG.
5b and 6a.

6b. and each conical plate 5 breath, 5b and 6*
, 6b are moved relative to each other in the axial direction of the rotation axis 8°9 by hydraulic control or the like to change the distance between the conical plates St and Sb and between the conical plates 6* and 6b. The contact position is changed in the radial direction of f-ri s, t; In this way, the rotation ratio, that is, the gear ratio is changed steplessly, and the belt 1 is stretched without slack.

FIGS. 9 and 10 show examples of the shapes of conventional blocks 3'. □-[Problem to be solved by the invention].

In the above vpe/l/) I, each belt element 2 and block 3' have different circumferential speed radii when passing over pulleys 5 and 6. In particular, block 3' has a V-shaped Teno J? Since the surfaces s*' and 3g are in contact with each other at a part of the block 3', the circumferential speed radius of the block 3' is smaller than that of the belt element 2.

Therefore, belt element 2 and block 3/ are arranged according to mutually different circumferential speed radii, ν (circumferential speed) = γ (circumferential speed radius) × ω (
Move at angular velocity (constant). In other words, since the angular velocity ω is constant on the pulleys 5 and 6, each belt element 2 and block 3' rotate together without relative slippage when passing through the pulley 5 and 6, but the circumferential velocity at this time is The speed will be faster for those located on the outside. Therefore, when traveling between the pulleys 5 and 6, relative slippage occurs between the belt element 2 and the block 3' due to the circumferential speed difference generated when traveling on the pulleys 5 and 6. In this way, the belt element 2 and the block 3' wear at the contact points with each other, causing a reduction in service life.

[Means for solving problems]

The present invention is applied to a V-belt block in which a large number of endless belt elements are stacked in the longitudinal direction. In the present invention, the block has data IJ on both sides in the width direction.
The belt includes a block body having a V-shaped tapered surface in contact with the belt element, and a roller that is rotatably provided on an axis in the width direction of the block body and located between the block body and the belt element.

The rollers are, for example, cylindrical or otherwise shaped, and are rotatably held in fitting grooves provided in the block body. , 2 [Function] When the V-belt using the blocks of the above configuration runs on the straight line between the pulleys, there is a gap between the belt element and the block 4 due to the difference in circumferential speed and degree that occurs when running on the pulleys. Causes relative slip. According to the block for V-e/I/) of the present invention, four rotatable rollers are interposed between the roller body and the belt element, and the rotation of the rollers causes the block body to It is possible to prevent wear caused by the relative speed difference between the belt element and the belt element.

〔Example〕

The V-belt block 3 shown in FIG. 1, similar to the illustrated example (FIG. 7), consists of a plurality of endless belt-shaped belt elements 2 (for example, about 10 to 20 pieces) stacked in the thickness direction. In the length direction K, many pieces are stacked and used. Each belt element 2 is
It consists of a thin metal plate with a thickness of about 0.1 to 0.2 w.

The block 3 includes a block body 10, a roller 11 located between the block body 10 and the belt element 2,
The rack consists of a transverse member 15 which is passed between the necks 13, 14 of the block body 10. These block body 10, support member 11, and horizontal member 15 are made of metal.

Above, on both sides of the block body IO in the width direction, there are pulleys 5.
, 6 are provided with V-shaped tapered surfaces 18° and 19 that are in contact with the inner surfaces thereof. In addition, a fitting groove 20 along the width direction is formed on the surface of the block body 10 on the side of the belt element 2, and the roller 11 can be freely rotated in the fitting groove 20 in the width direction of the block body 100. The fit is maintained. The rollers 11 have a cylindrical shape, and the fitting groove 20 has a semicircular concave cross section at the bottom so that the cylindrical shape can fit therein (see FIG. 2).

Since the roller I is held between the block body 10 and the belt element 2 and is held in the fitting groove 20, it will not come off even after one rotation. This groove 20 also serves as an oil reservoir for lubrication.

The V-belt block 3 having the above structure is provided overlappingly in the length direction of the belt element 2 in the same manner as shown in FIG.
．． Zhang Shi was handed over in 6 minutes.

Each block 3 runs integrally with the belt element 2 as the gear rotates 95 and 60 times. and a conical plate 5m constituting each pulley 5,6.

By changing the distance between 5b and 6*, 6b by hydraulic control or the like, the rotation ratio of the pulleys 5 and 60, that is, the speed ratio, can be changed steplessly. This point is the same as before.

According to the V-belt block 3 of this embodiment, the rotatable lever 11 is provided between the block body 10 and the belt element 2.

The relative movement between the block 3 and the belt element 2 based on the difference in circumferential speed when the belt 2 passes between the pulleys 5.6 can be smoothly guided. Therefore, wear due to contact can be significantly reduced compared to conventional systems in which the belt element and the block are in direct contact.

The rollers 11 are not necessarily cylindrical, but may be barrel-shaped rollers 21, as shown in FIG. 3, for example.

When the barrel-shaped structure 21 is adopted, there are advantages as described below.

That is, as mentioned above, the V-belt pulleys 5 and 6 can change the gear ratio steplessly by changing the distance between each pair of conical plates 5&, 5b and 6m, 6b (see Fig. 8). It is something that changes. Here, conical plates 5*, 6b
If the conical plates 5b and 6m on the movable side are fixed in the axial direction and only the conical plates 5b and 6m on the movable side are moved in the axial direction by hydraulic control etc., the belt 1 will not be at right angles to each rotating shaft 8.9, as shown by the dashed line. The vehicle runs tilted by an angle θ as the gear changes. In order to eliminate this inclination, for example, three conical plates 5b, 6g,
6bt - Must be moved axially in relation to each other or on either side of the axis of rotation 8,9. However, these methods significantly complicate the structure of the pulley portion and make control difficult. For this reason, the two conical plates si and tsb are usually fixed and the belt inclination θ caused by speed change is ignored.

If the inclination of the belt 1 changes as the speed changes in this manner, the running of the belt 1 becomes unstable.

Here, when the barrel-shaped rollers 21 of this embodiment are adopted, even if the belt 1 is slightly tilted, the curved surface of the barrel-shaped rollers 21
Since the xhllc belt elements 2 are in contact with each other, the belt 1 can run stably.

Moreover, since the belt element 2 moves while being in contact with the curved surface 21hK, when the belt element 2 and the block 3 cause relative slippage, the belt element 2 moves in the widthwise center portion of the barrel roller 21. Furthermore, it is possible to prevent the side surfaces of the belt element 2 from coming into contact with the neck portions 13, 14, etc. of the block body 10.

The radius of curvature R of 21% of the curved surface of the barrel-shaped roller is set in the range of 1550 to 1000 for the reason described below. According to the research conducted by the present inventors, when R becomes less than 50, the contact area of the first part with the belt element 2 becomes smaller.
, the surface pressure increases and the wear of the belt element 2 increases. Further, if R exceeds 1000, the curvature is insufficient, and the belt element 2 moves laterally from the center of the barrel roller 21 and comes into contact with the block body 10, causing a problem. Bad, so R is set within the above range.

Note that the fitting groove 2° that holds the barrel-shaped roller 21 may be curved in the width direction corresponding to the curvature of the curved surface 21h of the zeta roller (Fig. 3), or As illustrated in FIG. 5, the fitting groove 20 may be straight in the width direction.

In addition, as shown in FIG. 6, the length of the fitting groove 2o is
The length and width of the rollers may be made sufficiently large so that the two barrel-shaped rollers can slide in the width direction of the block body 10.

〔Effect of the invention〕

According to the present invention, there is a great effect in extending the life of a V-belt made of band-shaped belt elements and V-shaped blocks.

[Brief explanation of the drawing]

FIG. 1 is a front view of a V-belt block showing an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional side view of the block shown in FIG. 1 attached to a belt element, and FIG. FIG. 4 is a front view of the barrel-shaped ζ loop in FIG. 3, and FIGS. 5 and 6 are partial front views showing modified examples of the fitting groove, respectively. FIG. 7 is a schematic side view of a V-belt transmission device, FIG. 8 is a schematic plan view showing the positional relationship of pulleys, and FIGS. 9 and 10 are front views showing conventional V-belt blocks, respectively. 1...V"t bolt, 2...5 belts, 3-V belt block, 5, 6...pulley, 10...block body, 1 node...roller, 18.19. - V-shaped teno inner surface, 20... Fitting groove, 21... Barrel-shaped roller, 21a
...Curved surface. , Figure 1 Figure 2 Figure 3wJ Figure 4 Figure 55i3 Figure 6 Figure 7 Figure 8wi Figure 9

Claims (4)

[Claims] (1) In a V-belt block provided in large numbers stacked in the length direction of an endless belt-like belt element, this block has a block main body having a V-shaped tapered surface that contacts the pulleys on both sides in the width direction, and a block main body. A block for a V-belt, comprising: a roller located between the belt element and the belt element and rotatable around an axis in the width direction of the block body. (2) The V-belt block as set forth in claim (1), wherein the roller has a cylindrical shape and is rotatably held in a fitting groove formed in the block body. (3) Claim (1) characterized in that the rollers are barrel-shaped rollers that are thicker on the center side, and the barrel-shaped rollers are rotatably held in fitting grooves formed in the block body. Block for V-belt as described. (4) The radius of curvature R of the barrel-shaped roller is 50 to 100.
Claim No. (3) characterized in that the diameter is 0 mm.
V-belt block described in section.