JPH04224341A - High load transmitting v belt - Google Patents

Abstract

PURPOSE:To restrict impact force, reduce loads to blocks and tension belts and heighten durability by lowering a speed in the case respective blocks are fallen in pulleys without thinning the thickness of the blocks in a high load transmitting belt formed by engaging the tension belts and a large number of the blocks with each other. CONSTITUTION:Respective blocks are divided respectively into the upper blocks 6 and the lower blocks 12, and the upper beams 6a in the upper blocks 6 and the lower beams 12b in the lower blocks 12 are dislocated backward and forward in the lengthwise direction, for example, by a prescribed distance such as 1/2 of respective pitches in the upper and lower blocks 6 and 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-belt for high-load transmission used in automobile transmissions, etc., and more particularly to a so-called block belt constructed by locking a large number of blocks to a tension band. It is something.

0002

[Prior Art] Conventionally, gear-type or fluid-type transmissions have been widely used in automobiles or agricultural machinery such as combine harvesters and tractors.
Belt-type continuously variable transmissions are being developed with the aim of improving operability during gear shifting and improving fuel efficiency.

The belt used in this belt-type continuously variable transmission requires an extremely high torque transmission ability, and conventional general rubber V-belts cannot withstand high lateral pressure.
It is unusable due to buckling deformation.

[0004] Therefore, as an example of a high-load transmission belt that satisfies such requirements, a conventional belt disclosed in Japanese Patent No. 1441895 has been proposed.
No., Japanese Unexamined Patent Publication No. 61-206847, Utility Model Application No. 62-5
A so-called block belt disclosed in Japanese Patent No. 4348 and the like is known. For example, FIGS. 16 and 17
As shown in FIG. 3, a plurality of core wires 33, 33, . . .
A pair of endless tension bands 31, 31 formed by embedding a sliding contact portion 37, which slides into contact with the groove surface of the V pulley, on the left and right side surfaces.
37, and a large number of substantially trapezoidal plate-shaped blocks 36, 36, . . The same number of grooves 34, 35 as the blocks 36, 36, . On the upper and lower surfaces of each fitting portion 38 are protrusions 39 that can fit into the grooves 34 and 35 of the tension band 31, respectively.
40 is formed, and the block 36 is locked and fixed to the tension body 31 in the belt longitudinal direction by engagement of the concave grooves 34, 35 of the tension band 31 and the protrusions 39, 40 of each block 36.

[0005]

However, in the belt of this conventional structure, a large number of blocks 36, 36,
... are locked to the tension bands 31, 31 at a constant pitch P (interval), so as shown in Fig. 18, when the belt enters (wraps around) the pulley PLY, the belt falls against the pulley PLY. An intrusion movement occurs. At this time, if the running speed of the belt is Vb and the radius of the pulley PLY is r, then the falling speed Vd of the belt is Vd = Vb × (P/r)...(
1) is given. That is, as the speed Vb of the belt increases and as the pitch P of the blocks 36 increases, the falling speed Vd increases, and this acts as an impact force. This impact force puts a burden on the block 36 and tension band 31,
Particularly when driving at high speeds, these parts are likely to break down, and a solution has been sought.

[0006] In order to solve this problem, the pitch P of the blocks 36 may be reduced. However, this means reducing the thickness of the block 36, and when the thickness is reduced, the strength to withstand high lateral pressure from the pulley is insufficient, and there is a limit.

The present invention was made in view of the above points, and its object is to reduce the pitch between the blocks without changing the thickness of the blocks, and to reduce the falling movement of the belt onto the pulley. The purpose is to be able to reduce the speed of

[0008]

[Means for Solving the Problem] In order to achieve the above object, in the invention of claim 1, the block is divided into upper and lower blocks, and the upper beam in the upper block and the lower beam in the lower block are shifted back and forth by a predetermined distance. I did it like that.

Specifically, in the present invention, the belt has a pair of endless tension bands each having a plurality of concave grooves extending in the width direction on the upper and lower surfaces thereof at equal intervals in the length direction; It has a pair of left and right slit-shaped fitting parts into which each tension band is fitted, and a plurality of protrusions are formed on the upper and lower surfaces of each of the fitting parts, each of which can fit into the groove of the tension band. It consists of blocks.

[0010] Each block is divided into upper and lower blocks,
The upper block includes an upper beam having sliding contact parts on the left and right sides that make sliding contact with the groove surfaces of the pulleys, and a lower beam that is shorter and thinner than the upper beam, and the center pillar is arranged such that the fitting part is formed between both beams. On the other hand, the lower block has a lower beam having a sliding contact portion on the left and right sides that slides into contact with the groove surface of the pulley, and an upper beam that is shorter and thinner than the lower beam, and the above-mentioned upper beam is connected between the two beams. and a lower block joined by a center pillar to form a fitting part.

[0011] When the upper and lower blocks are connected to the tension body, the lower beam of the lower block is smaller than the pitch between the upper beam of the upper block and the pitch between the upper blocks due to the engagement of the protrusions of each block with the grooves of the tension band. The belt is alternately locked and fixed in the longitudinal direction so as to be shifted forward or backward by the same amount.

In the second aspect of the invention, the upper beam of the upper block and the lower beam of the lower block are shifted back and forth by 1/2 pitch.

That is, in the present invention, in the invention according to claim 1, the plurality of grooves formed on the upper and lower surfaces of each tension band are made to correspond vertically.

[0014] Furthermore, a fitting recess into which a half part of the upper beam or center pillar of the lower block in the thickness direction is fitted is provided on the front and rear surfaces of the upper beam or center pillar of each upper block, and On the front and back sides of
Each of the upper and lower blocks has a fitting recess into which the lower beam or center pillar of the upper block is fitted, and the lower beam or center pillar of the upper block is fitted with a recessed part in the thickness direction. The structure is such that the beams or center pillars of adjacent blocks are fitted into the fitting recesses of the blocks and are alternately locked and fixed in the belt longitudinal direction.

[0015] In the third aspect of the invention, each block is made of a resin material, and a pair of beam portions of the same length are embedded in the resin material and extend parallel to each other in the left-right direction, and the central portions are joined by a pillar portion. The upper block is made up of reinforcing members.
The beam portion of the reinforcing member is embedded in the upper beam, and for the lower block, the beam portion of the reinforcing member is embedded in the lower beam.

[0016]

[Operation] According to the above structure, in the inventions of claims 1 and 2, the upper beam of the upper block and the lower beam of the lower block of the belt are shifted in the front and rear direction, so that when the belt enters the pulley, each beam When entering beyond the approach boundary line of the pulley, the approach of the lower beam of the lower block behind the upper block starts before the approach of the upper beam of the above upper block is completely completed, and the lower beam of the lower block begins to enter the upper block It is possible to realize the approach of Therefore, the pitch between the blocks can be substantially reduced without reducing the thickness of the blocks, and the speed at which the belt falls onto the pulley can be reduced.

In particular, in the invention of claim 2, since the upper and lower beams are shifted by 1/2 of the inter-block pitch, when the upper beam of the upper block enters the pulley by half (the pulley entry boundary line is ), and at the same time, the lower beam of the lower block behind it enters. Also,
When the lower beam enters only half, the upper beam of the upper block behind it will enter at the same time,
The approach timings of the upper and lower beams of adjacent blocks can be synchronized, allowing the belt to enter more stably.

According to the third aspect of the invention, since the reinforcing member is embedded in each block, the strength of the block against lateral pressure can be increased. Moreover, since the reinforcing members of the upper and lower blocks all have the same shape, the upper and lower blocks can be easily manufactured by making them common.

[0019]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

1 to 5 show a V-belt B for high-load transmission according to a first embodiment of the present invention. This belt B consists of a large number of upper blocks 6, 6, .
2, 12, . . . are alternately locked and fixed.

Each of the tension bands 1 includes a shape-retaining layer 2 made of fiber-reinforced rubber or fiber-reinforced plastic, and a plurality of longitudinally extending wires embedded in the upper and lower center portions of the shape-retaining layer 2 in line with the width direction of the belt. It is composed of core wires 3, 3,... Further, upper grooves 4, 4, . . . are provided on the upper surface of the shape-retaining layer 2 as engaging portions extending in the width direction, and similar lower grooves 5, 5, . . . are formed on the lower surface of the upper block 6, respectively. , 6, . . . or twice as many as the lower blocks 12, 12, .

As shown in FIGS. 6 to 8, each of the upper blocks 6 includes an upper beam 6a and a lower beam 6b that extend in parallel in the left-right direction, and a center that integrally connects the left and right center portions of both beams 6a and 6b. It consists of a pillar 6c. Above lower beam 6
b is formed to be shorter and thinner than the upper beam 6a, and sliding contact portions 7, 7 are provided on both left and right side surfaces of the upper beam 6a for slidingly contacting groove surfaces of a pulley PLY (not shown). A pair of slit-shaped fitting parts 8, 8 surrounded by upper and lower beams 6a, 6b and a center pillar 6c are formed on the left and right sides of the upper block 6. The upper wall surface of each fitting part 8 has an upper protrusion 9 as a locking part that fits into each upper groove 4 on the upper surface of the tension band 1, and the lower wall surface of the fitting part 8 has an upper protrusion 9 on the lower surface of the tension band 1. Lower protrusions 10 are formed as locking parts that fit into the respective lower grooves 5 of the tension band 1. The tension bands 1, 1 are fitted into the fitting portions 8, 8 of each block, respectively.

On the other hand, each lower block 12 has the shape of the upper block 6 upside down, and as shown in FIGS. The upper beam 12a is shorter and thinner than the lower beam 12b, and the lower beam 12b has sliding portions on both left and right sides of the lower beam 12b, which are in sliding contact with the pulley groove surface. 13
, 13 are formed. A pair of slit-like fitting parts 14, 14 are formed on the left and right sides of the lower block 12, and are surrounded by upper and lower beams 12a, 12b and a center pillar 12c. The upper wall surface of each fitting part 14 has an upper protrusion 15 that fits into each upper groove 4 on the upper surface of the tension band 1, and the lower wall surface of the fitting part 14 has an upper groove 15 on the lower surface of the tension band 1. Lower protrusions 16 that fit into the grooves 5 are formed, and these protrusions 15 and 16 are engaged with the grooves 4 and 5 of the tension band 1 every other time to form the fitting portion 14 of each block. , 14 are fitted with the tension bands 1, 1, respectively.

Furthermore, fitting recesses 11, 11 are formed on the front and rear surfaces of the upper beam 6a or the center pillar 6c of the upper block 6, into which half of the upper beam 12a or the center pillar 12c of the lower block 12 is fitted. has been done. On the other hand, similarly, fitting recesses 17, 17 are formed on the front and rear surfaces of the lower beam 12b or center pillar 12c of the lower block 12, into which half of the lower beam 6b or center pillar 6c of the upper block 6 in the thickness direction is fitted. ing.

The upper blocks 6, 6, . . . and the lower blocks 12, 12, . The belt is alternately locked and fixed in the longitudinal direction by engagement with the concave grooves 4 and 5 of 1 and 1, and in this state, the front and rear of the upper block 6 are inserted into the fitting recesses 11 and 11 on the front and rear surfaces of each upper block 6, respectively. Each lower beam 12b or center pillar 12c of the lower blocks 12, 12 is fitted into the fitting recesses 17, 17 on the front and rear surfaces of each lower block 12, respectively, and each upper beam of the upper blocks 6, 6 on the front and rear of the lower block 12, respectively. 6a to center pillar 6c are fitted, and the lower beam 12b of the lower block 12 is shifted from the upper beam 6a of the upper block 6 by half the pitch P between the upper blocks 6, 6 ΔP = (1/2)
It is shifted forward by P.

Furthermore, the center pillar 6 of each block 6, 12
protrusions 18, 18 with a hemispherical cross section are formed on the front surface of the blocks 6, 12c, and recesses 19, 19 with a hemispherical cross section are formed on the rear surface, as shown in FIG. , 1, the protrusions 18 of each block 6, 12 are fitted into the recesses 19 on the front side of the blocks 6, 12, thereby preventing swinging between the blocks 6, 12.

Therefore, in the above embodiment, each upper beam 6a of the upper blocks 6, 6, . . .
and the lower beams 12b of each of the lower blocks 12, 12, . , when the belt B enters the pulley, the upper beam 6a of the upper block 6 and the lower beam 12b of the lower block 12 enter the pulley beyond the pulley entry boundary line L (see FIG. 2), At the same time that the upper beam 6a crosses the pulley entry boundary line L by half and enters the pulley by half, the lower beam 12b of the lower block 12 behind it enters. Further, when the lower beam 12b enters only half way, the upper beam 6a of the upper block 6 behind it enters at the same time. Thereafter, similar operations are repeated to synchronize the entry timings of the upper and lower beams 6a, 12b of the adjacent blocks 6, 12. Therefore, block 6
, 12, the block pitch can be substantially reduced without reducing the thickness of the belt B, and the falling speed of the belt B to the pulley can be lowered to reduce the tension band 1, 1 and the upper and lower blocks 6, 1 during high-speed running.
2 can be prevented from breaking, and the durability of the belt B can be improved.

In experiments conducted by the present inventors, the belt of the present invention and the conventional belt having the structure of the above embodiment were wound around the driving and driven pulleys, and the tension load of the belt was set to 200 kg.
When the pulley was rotated at a speed of 6000 rpm in an atmosphere of It turns out that the power has decreased.

FIGS. 12 to 15 show a second embodiment (the same parts as in FIGS. 6 to 11 are given the same reference numerals and detailed explanations are omitted), and the structures of blocks 6 and 12 are changed. It is something that

In this embodiment, each block 6', 12'
is composed of a resin material 21 and a reinforcing member 22 embedded in the resin material 21, and the reinforcing member 22 includes a pair of beam portions 22a, 2 having the same length and extending parallel to each other in the left-right direction.
The central portions of the pillars 2a are joined together by a pillar portion 22b, forming a substantially "E" shape. That is, in the upper block 6', as shown in FIG.
And as shown in FIG. 13, one beam part 22a of the reinforcing member 22 is embedded in the upper beam 6a', and specifically, a resin material 21 is placed on the upper surface or both left and right ends of the one beam part 22a of the reinforcing member 22. The protruding stripes 9 and 10 on the upper and lower wall surfaces of each fitting portion 8 are also made of resin material 21 .

On the other hand, in the lower block 12', as shown in FIGS. 14 and 15, a reinforcing member 22 is attached to the lower beam 12b'.
Specifically, a resin material 21 is protruded from the lower surface or both left and right ends of one of the beam parts 22a of the reinforcing member 22, and the convex strips 15 on the upper and lower wall surfaces of each fitting part 14 are embedded. , 16 are also made of resin material 21.

Therefore, in the case of this embodiment, in addition to the effects of the first embodiment, since a part of the blocks 6', 12' is constituted by the reinforcing member 22, the blocks 6', 12' are
The strength against the high side pressure from the pulley 2' can be increased. Moreover, since the reinforcing members 22 of the upper and lower blocks 6' and 12' can be shared with the same configuration, each block 6'
, 12' can be easily manufactured.

In each of the above embodiments, the upper and lower blocks 6,
The deviation amount ΔP between blocks 6 and 6 (or 12 and 12
), but it can be changed within the range of 0<ΔP<1.

[0034]

As explained above, according to the inventions of claims 1 and 2, the blocks in the high-load transmission belt are divided into upper and lower blocks, and the upper beam of the upper block and the lower beam of the lower block are separated by a predetermined deviation. I shifted the amount back and forth, so
The pitch between blocks can be substantially reduced without changing the thickness of the blocks, reducing the speed and impact force of the falling motion of the belt onto the pulley, and reducing the tension band and blocks when the belt is running at high speed. It has an excellent practical effect of being able to effectively suppress breakage and significantly improve the durability of the belt.

In particular, according to the second aspect of the invention, since the deviation between the upper and lower beams is set to half the inter-block pitch, it is possible to synchronize the entry timing of the upper and lower beams of adjacent upper and lower blocks, and the belt to the pulley can be synchronized. The approach can be made even more stable.

According to the third aspect of the invention, since the reinforcing member is embedded in each block, the strength against the lateral pressure of the block can be increased, and the upper and lower blocks can be easily separated by using the same reinforcing member for the upper and lower blocks. can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a portion of a belt according to a first embodiment of the present invention.

FIG. 2 is a side view of the belt.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a sectional view taken along the line V-V in FIG. 1;

FIG. 6 is a front view of the upper block according to the first embodiment of the present invention.

FIG. 7 is a side view of the block.

FIG. 8 is a perspective view of the block.

FIG. 9 is a front view of the lower block according to the first embodiment of the present invention.

FIG. 10 is a side view of the same block.

FIG. 11 is a perspective view of the block.

FIG. 12 is a front view of an upper block according to Example 2 of the present invention.

FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. 12;

FIG. 14 is a front view of a lower block according to Example 2 of the present invention.

15 is a sectional view taken along the line XV-XV in FIG. 14. FIG.

FIG. 16 is a perspective view showing a conventional belt.

FIG. 17 is a side view of the belt.

FIG. 18 is an explanatory diagram showing the movement of the belt falling onto the pulley.

[Explanation of symbols]

B, B'...V belt 1...Tension band 4, 5...concave groove 6,6'...Upper block 6a, 6a'...upper beam 6b, 6b'...lower beam 6c, 6c'...center pillar 7...Sliding contact part 8...Mating part 9,10...Convex strip 11... Fitting recess 12, 12'...lower block 12a, 12a'...upper beam 12b, 12b'...lower beam 12c, 12c'...center pillar 13...Sliding contact part 14...Mating part 15, 16...Protruding stripes 17... Fitting recess 21...Resin material 22...Reinforcement member 22a...Beam part 22b...pillar part

Claims (3)

[Claims] 1. A pair of endless tension bands each having a plurality of concave grooves extending in the width direction on the upper and lower surfaces thereof and spaced at equal intervals in the length direction; and a large number of blocks each having a pair of slit-like fitting portions, each of which has a protruding strip formed on the upper and lower surfaces of each fitting portion, each of which is capable of fitting into the groove of the tension band. consists of an upper block and a lower block, and the above upper block is
An upper beam having sliding contact parts slidingly in contact with the groove surfaces of the pulleys on the left and right sides, and a lower beam that is shorter and thinner than the upper beam are joined by a center pillar so as to form the above-mentioned fitting part between both beams. On the other hand, the lower block has a lower beam having a sliding contact portion on the left and right side surfaces for sliding contact with the groove surface of the pulley, and an upper beam that is shorter and thinner than the lower beam, so as to form the above-mentioned fitting portion between both beams. The upper and lower blocks are connected to each other by a center pillar, and the upper and lower blocks are connected to the tension body by the engagement of the convex strips of each block with the grooves of the tension band, so that the lower beam of the lower block is connected between the upper beam of the upper block and the upper block. A V-belt for high-load power transmission, characterized in that the V-belt is alternately locked and fixed in the longitudinal direction of the belt so as to be shifted forward or backward by an amount smaller than the pitch of the belt. 2. A pair of endless tension bands each having a plurality of concave grooves extending in the width direction on the upper and lower surfaces, spaced at equal intervals in the length direction and corresponding to each other in the upper and lower sides; It has a pair of left and right slit-shaped fitting portions that fit together, and is composed of a large number of blocks each having a protrusion formed on the upper and lower surfaces of each fitting portion that can fit into the groove of the tension band. Each of the above blocks consists of an upper block and a lower block, and the above upper block has an upper beam having sliding contact portions on the left and right side surfaces for sliding contact with the groove surface of the pulley, and a lower beam that is shorter and thinner than the upper beam. Both beams are joined by a center pillar to form the above-mentioned fitting part between them, and the lower block has a lower beam having sliding contact parts on the left and right sides that make sliding contact with the groove surface of the pulley, and a lower beam that is lower than the lower beam. A short and thin upper beam is connected to the center pillar so as to form the above-mentioned fitting part between both beams, and the upper beam or center pillar of the lower block is attached to the front and rear surfaces of the upper beam or center pillar of the upper block. A fitting recess into which a half part of the lower beam or center pillar of the upper block is fitted is formed on the front and rear surfaces of the lower beam or center pillar of the lower block. A recess is formed, and the upper and lower blocks engage the tension body with the beam or center pillar of the adjacent block into the insertion recess of each block by engaging the convex strip of each block with the groove of the tension band. A V-belt for high-load transmission characterized by being alternately locked and fixed in the longitudinal direction of the belt. 3. The block has a reinforcing member embedded in a resin material, which is formed by connecting the central parts of a pair of beam parts of the same length extending parallel to each other in the left-right direction at a pillar part, and the upper block has a reinforcing member embedded in a resin material. 3. The V-belt for high-load transmission according to claim 1, wherein the beam portion of the reinforcing member is embedded in the beam, and the beam portion of the reinforcing member is embedded in the lower beam of the lower block.