JPH0672646B2 - Endless belt for transmission - Google Patents

Description

The present invention relates to a transmission endless belt, and more particularly to a belt for a continuously variable transmission that is used by being wound around a primary pulley and a secondary pulley composed of a pair of sheaves. Relates to a chain type belt formed by connecting a number of links endlessly.

(B) Conventional Technology As shown in FIG. 21 (a), the chain type belt 1 of the prior art is composed of a number of links 2 ', pins 3'and V blocks 5', and both ends of the link 2 '. A pin 3'is fitted into a pin hole 2'a having a circular cross section and connected endlessly. Further, the link 2'is formed into a V shape so that both side surfaces come into contact with a pair of sheaves. The formed V blocks 5'are connected to each other (see JP-A-57-22442).

Further, a chain type belt in which a pair of connecting pin members capable of swinging contact with each other is fitted into one pin hole instead of the cylindrical pin has also been devised (Japanese Patent Publication No. 35-14807 and Japanese Patent Publication No. Sho).
52-35833 and JP-B-58-3136).

(C) Problems to be Solved by the Invention By the way, the belt 1 of the above-mentioned conventional example is not limited to one using a cylindrical pin, but one using a pair of connecting pin members, the link and the pin member are separate members. Consists of
Therefore, it is necessary to form a hole for inserting the pin member in the link.

Therefore, as shown in FIG. 21, the pitch P of the chain type belt 1 must be larger than the sum of the radius a of the pin hole 2'a and the link end length b required for strength (P >
2 (a + b), the pitch P cannot be reduced.
Therefore, the conventional belt produces a large polygonal effect,
Undesirable phenomena such as pulsation of transmission speed, vibration of belt and generation of noise occur.

Also, a chain type belt in which a pin and / or a pin hole is formed integrally with a V block to shorten the pitch has been devised (JP-A-57-12147).

However, the belt is composed of a V-block member that receives the compressive force from the pulley and transfers the power between the belt and the pulley by frictional force, and a link member that receives the tensile force and transmits the power by one member. Therefore, the structure becomes extremely complicated, and a complicated force acts on the V-block integrated member provided with pins and the like, and further, these V-block integrated members have a structure in which the V-block integrated members are extremely easy to come off in the lateral direction. There is a risk that the V-block integrated member may come off during traveling and the belt may be disassembled, and the V-block integrated member cannot be configured in multiple layers, which may cause problems in power transmission and durability.

Therefore, in the present invention, the link and the V block are formed separately, and the links can be connected in multiple, so that the pitch can be greatly shortened while the structure is extremely excellent in strength. Therefore, it is an object of the present invention to provide an endless belt for transmission which solves the above problems.

(D) Means for Solving the Problem In the first invention, as shown in FIG. 1, pin portions 10 are integrally formed on both ends of the link 7 so as to project perpendicularly to the link plane. A hole 11 is formed facing the inside of the pin portion 10, and the inner surface 10b of the pin portion is formed by a rolling surface. Furthermore, the pin portion 10 of each link is formed into a hole 11 of an adjacent link and a rolling surface. Insert and engage 10b so that they abut each other
A multi-section link row 2 is configured, and the V block 5 is locked and attached so as to sandwich the links 7n, 7n on both outermost rows of the link row 2, and the V row 5 disassembles the link row 2. It is characterized by being held and configured so as not to.

Further, in the second invention, as shown in FIG. 14, on both surfaces of both ends of the link 27, projections 29 ... Projecting over substantially the entire vertical width thereof are integrally formed, and the projections 29 are formed. In addition to forming a concave portion 30 between the inner sides of the, the rolling surface 31 between the convex portion 29 of each link 27 in the concave portion 30 of the adjacent link, 31 is formed on the inner surface of the convex portion. Are engaged with each other to form a multiplex / multinode link row 2, and the V block 5 is locked / mounted so as to sandwich the links 27n, 27n of both outermost rows of the link row 2. The V-block 5 is configured to hold the link string 2 so as not to disassemble it.

(E) Action Based on the above-described configuration, the sheave of the primary pulley presses the V block 5, whereby power is transmitted from the pulley to the V block 5, and further, the V block and both outermost row links.
Outer row link from the V block 5 by locking with 7n, 27n
Power is transmitted to 7n and 27n. Then, from the link, the rolling surfaces 11b and 11b are joined to each other based on the engagement between the pin portion 10 and the hole 11 (first invention), or the rolling is based on the engagement between the convex portion 29 and the concave portion 30. By joining with the surfaces 31 and 31 (second invention), the force is dispersed and transmitted to the links 7 and 27, and the power is transmitted to the link row 2 via the pulling force acting on the links. Then, in the secondary pulley portion, both outermost row links 7
Power is transmitted from n, 27n to the V block 5, and further, based on frictional force, power is transmitted from the V block 5 to the secondary pulley.

(F) Example An example in which the endless belt for transmission according to the present invention is used in a continuously variable transmission will be described below with reference to the drawings.

First, a first embodiment according to the present invention will be described with reference to FIGS. 1 to 8.

The belt 1 for a continuously variable transmission is composed of a series of link rows 2 and a large number of V blocks 5, and the link rows 2 are center links 6
And side links 7 are included. The central link 6 is
As shown in FIGS. 5 and 6, pin portions 9 ... Are integrally formed on both surfaces of both end portions thereof so as to project perpendicularly to the link plane, and the pin portion 9 has an outer portion 9a having a cylindrical shape. In addition, the inner portion 9b is formed of a rolling surface formed of an arc surface having a relatively large curvature, and the protruding length l thereof is substantially the same as or slightly shorter than the plate thickness t of the links 6 and 7. So formed. As shown in FIGS. 7 and 8, the side link 7 has a pin portion 10 integrally formed on one side surface of both end portions thereof so as to project perpendicularly to the link plane. Similar to the pin portion 9 of the center link described above, it is composed of a cylindrical outer side portion 10a and an arcuate rolling inner side portion 10b, and its protruding length 1 is also formed to be the same length as the pin portion 9 described above. Further, the side link 7 has a hole 11 formed inside the pin portion 10, and the hole 11 is formed in a circular shape together with the outside 10a of the pin portion 10, that is, the inside portion is formed in a cylindrical shape. At the same time, the outer side is aligned with the inner side rolling surface 10b of the pin 10. Further, the V block 5 is, as shown in FIGS. 1 to 4, a V block piece made of a metal piece having a predetermined thickness.
12 and a thin plate-like locking piece 13. The V block piece 12 has a recessed groove 15 for receiving the link 2, and tapered surfaces 16 and 16 are formed on the lower portions of both side surfaces of the V block piece 12 so as to be aligned with the pulley. 17 are formed. Further, the locking piece 13 is made of a leaf spring material, both ends thereof are bent, and locking claws 19, 19 are formed at the tips of the bent portions.

Then, in order to assemble the belt 1 for the continuously variable transmission, first, the central links 6 are laterally arranged endlessly. Further, on the central link 6, the pin portion 9 is formed in the hole of the side link 7.
11 so as to fitted to, align the side link 7 ₁ of the first column. Similarly, the first column of the side links ₇₁ of the pin portion 10 holes or less
The side links 7 ₂ in the second row are arranged so as to be fitted into 11, and the links 7 ₃ , in the third row, ..., And the links 7n in the n-th row are sequentially arranged. Then, the link row 2 in which the one side is connected is replaced in the vertical direction, and the side rows 7 _{1 in} the first row, the links 7 _{2 in} the second row, ... 2 are superposed on 2n + 1 layers and connected endlessly. Then, the V block piece 12 is inserted from the inner diameter side of the endless link row 2 so that the concave groove 15 is fitted between the pin portions 10, 10 of the outermost row side links 7n, 7n. With the multiple link row 2 completely inserted in the groove 15, the locking piece 13 is covered from the outer diameter side, and the locking claw 19 of the locking piece 13 is engaged with the notch 17 of the block piece 12. Then, the V block 5 is mounted and the multiple link row 2 is prevented from being disassembled into pieces.

Then, the continuously variable transmission belt 1 ₁ is used in wound between the primary pulley and the secondary pulley, the sheave and the block piece tapered surface 16 based on the sheave of the pulley is sandwiched and pressed strongly V-block 5 Power is transmitted between the pulley and the V block 5 due to the frictional force of
When 12 contacts the pin portion 10 of the outermost row link 7n, power is transmitted to the link row 2. And further, the link
The force is distributed to each link 6, 7 based on the fact that the inner rolling surfaces 9b, 10b of the pin portions 9, 10 of 6, 7 are joined to the inner rolling surfaces 9b, 10b of the adjacent pin portions. Moreover, the power is transmitted based on the pulling force acting on each of the links 6 and 7. On this occasion,
Arcuate rolling filtrate rising surface 9b of the pin portion, by 10b is rolling filtration shy contact, each link 6,7 to bend the belt 1 ₁ may freely change its curvature to match the effective diameter of the pulley.

In the above-described embodiment, the link row 2 is composed of the center link 6 having the pin portions 9 on both sides and the side link 7 having the pin portion 10 on only one side.
Can also be configured. In this case, the pin portion for locking the V block 5 does not exist on one side of the outermost row, but the V block 5 is locked by using a special link only on the outermost row of one side or by fixing means such as a pin. Good.

Next, a second embodiment in which the first embodiment is modified will be described with reference to FIGS. 9 and 10.

This continuously variable transmission belt 1 ₂ is obtained by mounting the V-block 13 further narrow between the V block 5 of the belt 1 of the _first embodiment. That is, the V block 20 is composed of a narrow V block piece 21 and a locking piece 22, and the block piece 21 is fitted between the adjacent links 7n in the outermost row and locked by the locking piece 22. Has been done. Therefore, V block 5 has one link
While the inner rolling surfaces 10b and 10b of both end pin portions 10 and 10 in 7n are contacted and positioned, the narrow V block 20 has outer cylindrical surfaces 10a and 1a of pin portions 10 and 10 in different links 7n.
Positioned in contact with 0a.

Thus, the belt 1 ₂ according to this embodiment, the pitch in contact with the pulley can be reduced significantly, since further consisting of two different V blocks 5,20 width, changes the contact period between the pulley, the peak frequency Dispersion can reduce noise. Further, the number of V blocks can be doubled, the contact surface with the pulley can be increased, slippage can be reduced, and transmission torque can be increased.

Next, a further modified third embodiment will be described with reference to FIGS. 11 to 13.

Continuously variable transmission belt 1 ₃ according to this embodiment, the belt 1 of the _first embodiment, the outermost row of links special link 7 '
It has been changed to n. That is, as shown in detail in FIGS. 12 and 13, the protrusions 2 are formed on one side surface of both ends of the link 7'n.
3 and 23 are formed, so that between the convex portions 23, the V block piece 12 is formed.
Side walls 25a, 25 that make contact with the side of the
A groove portion 25 having a is formed. Then, the block piece 12 of the V block 5 is fitted into the concave groove portion 25, and locked and fixed by the locking piece 13.

Thus, the belt 1 ₃ according to this embodiment, V block piece
The contact surface between 12 and the outermost row link 7'n increases, the contact stress is reduced when the force is transmitted from the V block 5 to the link row 2 or from the link row 2 to the V block 5, and the durability is improved. To do. Further, the V block 5 is, as shown in FIG.
The lower tapered surface 16 receives the force indicated by arrow F from the pulley,
In addition, at the upper part, the force shown by the arrow F'from the link row 2
Therefore, a relatively large moment acts on the V block 5 itself, but since the V block 5 contacts the link 7'n at substantially the entire width 25a in the vertical direction, the V block 5 is inclined with respect to the link row 2. And stable power transmission can be performed.

Next, an embodiment (fourth embodiment) according to the present invention will be described with reference to FIGS. 14 to 18.

Continuously variable transmission belt 1 ₄ according to this embodiment, similarly to the foregoing embodiment, consists of the link string 2 and V block 5, the structure of the links constituting the link row is different from the previous embodiments . As shown in FIG. 18, the link 27 has convex portions 29 ... Formed on both surfaces of both ends so that concave portions 30 are formed between the convex portions 29. Then, the inner surface of the convex portion 29
Reference numeral 31 stands perpendicular to the plane of the link 27, and forms two tapered surfaces 31a and 31b having a central portion C protruding or a rolling surface composed of a gently curved surface. Similarly, the side surfaces 32 at both ends of the link 27 are also formed by tapered surfaces 32a and 32b or a gently curved surface from which the central portion C'projects.

Then, the assembled present belt 1 _4, the recess 30 of the link 27
The protrusions 29, 29 of the link 27 of the front and rear two sections that are adjacent to
Although engagement is connected intertwined with each other at both sides of the link 27, first, as shown in FIG. 16, the second link section 2 ₂ in the center, a first link which engages on the link clause 2 ₂ the engage one another clause 2 ₁ and the third link section 2 _3. In this state, insert the block piece 12 of the V-block 5 from the second lower link clause 2 _2, engaging and fastening the outermost row link 27n, from above fitted into the recess 30 of the 27n at the locking piece 13 Then, each link clause 2 ₁ , 2
_2, 2 ₃ is prevented from passing in the lateral direction and the vertical direction,
Hold together. Then, the fourth link Section 2 ₄ and the fifth link node 2 ₅ connected to the third link Section 2 ₃ engages, similarly V
By assembling the block 5, the link nodes are prevented from being disassembled and are held together. Following repeated similarly assembled V-block 5 the final link section 2n connected to the first link section 2 _1, the belt 1 ₄ is completed assembled annularly.

The power transmission according to the belt 1 _4, like the first embodiment, the frictional force between the sheave and the V-block 5 of the primary pulley is transmitted from the pulley to the V-block 5, further V-block 5 and the outermost row The link 27n is transmitted to the link 27n by being engaged with the convex portion 29, and is dispersed and transmitted to the multiplex / multi-node link row 2 by the engagement of the convex portion 29 and the concave portion 30 of each link 27. Further, the pulling force acting on each link 27 is transmitted to the V block 5 on the secondary pulley side, and the friction force is transmitted to the sheave of the secondary pulley.
At this time, the links 27 are joined at the rolling surface 31 where the central portion C is protruding, and as shown in FIG. 15, they can be freely bent by the gaps a and b between the upper and lower portions. without links both side ends 32 also interfere during bending, belt 1 ₄ can be bent freely in conformity with the pulley effective diameter.

Next, a fifth embodiment in which the fourth embodiment is partially modified will be described with reference to FIGS. 19 and 29.

Continuously variable transmission belt 1 ₅ according to this embodiment, the belt 1 ₄ of the fourth embodiment is obtained by mounting another of the 2V block 33 also between the V-block 5. That is, the second V block 33
Is composed of a V block piece 35 and a locking piece 36. The V block piece 35 has the same outer dimensions as the block piece 12 of the V block 5, but the width of the concave groove 37 for receiving the link row 2. The dimension is increased by the height of the convex portion 29 of the link 27. Then, after assembling the link string 2 and V block 5, i.e. in the belt 1 ₄ states of the fourth embodiment, the 2V block
The block piece 35 of 33 is inserted between the V blocks 5, and is locked and fixed by the locking piece 36 to be assembled.

Thus, the belt 1 ₅ is significantly reduced cycle block 5 comes into contact with the pulley, thereby significantly reducing the occurrence of noise, along with the contact area between the sheaves of the pulley increases to reduce slippage The transmission torque can be increased. Further, since the V blocks 5 and 33 are closely arranged so as to contact each other, the transmitted power is not only the tensile force acting on the link row 2 but also the pressing force directly acting on each block 5, 33. Also, the transmission force can be dramatically increased, and the blocks 5 and 33 can be prevented from inclining, so that power can be transmitted reliably and smoothly.

(G) Effect of the Invention As described above, according to the first aspect of the invention, the pin portion 10 is formed integrally with the link 7, and the pressing force acting on the rolling surfaces 10b, 10b on the inner surface of the pin portion is applied. Since the power is transmitted by the conventional link 2 ', as shown in Fig. 21 (b).
Compared with (see FIG. 21 (a)), the radius a of the pin hole 2'a is unnecessary, and the pitch P '(P'> 2b) can be reduced, and therefore the adverse effect due to the polygonal effect is reduced. Therefore, smooth power transmission can be performed, and since each link 7 receives a force inside the pin portion 10, the tensile strength of the link is improved and the shear strength is improved, and the links 7 are multiplexed. What cooperation with the a configuration, it is possible to improve the endless (continuously variable transmission) belt 1 ₁ to 1 ₃ of the strength and durability for transmission.

Further, according to the second aspect of the present invention, since the convex portion 29 and the concave portion 30 formed integrally with the link 27 are engaged with each other to be connected,
As shown in FIG. 7C, the pin hole 2'a unlike the conventional link 2'is not necessary at all, and the pitch P "(P"> 2b ') is eliminated.
Therefore, the adverse effect due to the polygonal effect is reduced, and since the convex portion 29 and the concave portion 30 are provided on both sides of the link 27, the biasing force does not act on the link 27 and the belt It is possible to prevent the meandering of the rod and smoothly transmit power, and since the link 27 has no pin hole that causes a notch effect and receives the force at the inner rolling surface 31 of the convex portion 29. , In combination with the multiple configuration of the link 27, the endless belt for transmission (for continuously variable transmission) 1 ₄ , 1
The strength and durability of ₅ can be greatly improved.

And a belt according to the present invention (first invention and second invention)
In 1 ₁ to ₁₅ , the link row 2 and the V block 5 are configured separately, and the clamping force from the pulley acts on the V block 5 to transfer the power to and from the pulley. A large pinching force from the pulley acts on the V block and the link row 2
(Particularly, the pin portion 10 and the convex portion 29) does not act, and the pulling force acting on the endless belt does not act on the link row and not on the V block, thereby acting on each member. The force is simplified, the durability of the whole belt can be improved, and the pin portion 10 of the link 7,27 is
Alternatively, the cross-sectional area of the convex portion 29 can be reduced and the pitch of the link rows can be reduced. Further, the number of multiple rows of the links 7 and 27 can be arbitrarily changed, and can be easily dealt with according to the required transmission power. Further, since the link row 2 is retained by locking and mounting the V block 5 so as not to be disassembled, the V block 5 has not only the power transmission with the pulley but also the function of holding the link row 2, It is possible to reliably prevent the link rows from being disassembled by the V blocks 5 having a high strength, although the link row holding means is not required, and the links 7 and 27 are pulled out laterally or vertically during operation. , Safe.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment according to the first invention, FIG. 2 is a partially sectional front view, FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. 2 Sectional view taken along line IV-IV,
FIG. 5 is a perspective view showing the center link, FIG. 6 is a view showing the center link, (a) is a front view, (b) is a side view, and (c).
Is a sectional view taken along line cc of (a), FIG. 7 is a perspective view showing a side link, FIG. 8 is a view showing a side link, (a) is a front view, and (b) is a side view. Figure, (c) is (a)
FIG. 7 is a sectional view taken along line cc of FIG. FIG. 9 is a partially sectional front view showing a second embodiment in which the first embodiment is partially modified, and FIG. 10 is a sectional view taken along line XX of FIG. FIG. 11 is a perspective view showing a third embodiment in which the first embodiment is partially modified, FIG. 12 is a perspective view showing the outermost row link thereof, and FIG. 13 is a view showing the link, (a) Is a front view, (b) is a side view, and (c) is a sectional view taken along line cc of (a). FIG. 14 is a perspective view showing a fourth embodiment according to the second invention, FIG. 15 is a partially sectional front view, and FIG. 16 is FIG.
FIG. 17 is a sectional view taken along line I-XVI, FIG. 17 is a sectional view taken along line XVII-XVII in FIG. 15, and FIG. 18 is a perspective view showing a link. FIG. 19 is a partially sectional front view showing a fifth embodiment in which the fourth embodiment is partially modified, and FIG. 20 is a sectional view taken along line XX-XX in FIG. FIG. 21 is a diagram comparing the conventional example, the first invention and the second invention, where (a) is the conventional example, (b) is the first invention, and (c).
FIG. 3 is a front view showing a belt according to each of the second inventions. 1 ₁ to ₁₅ ... Endless belt for transmission (belt for continuously variable transmission), 2
… Link row, 5… V block, 6… (center) link, 7
... (side) link, 7n ... outermost row link, 7'n ... outermost row link, 9 ... pin section, 10 ... pin section, 10b ... rolling surface, 1
1 ... Hole, 12 ... V block piece, 13 ... Locking piece, 20 ... V block, 25 ... Recessed groove part, 27 ... Link, 27n ... Outermost row link, 29
… Convex part, 30… Concave part, 31… Rolling surface, 33… V block.

Claims (7)

[Claims] 1. A link string comprising a plurality of links and a V block fixed to the link string, the V block comprising:
An endless belt for transmission, which is pinched by a pulley and transmits power by a frictional force generated between the pulley and the pulley. The end portion of the link has pin portions integrally projecting perpendicularly to the link plane. And a hole is formed facing the inside of the pin portion, and the inner surface of the pin portion is formed by a rolling surface, and the pin portion of each link is further formed in the hole of the adjacent link.
Inserting and engaging so that the rolling surfaces contact each other
The multi-section link row is configured, and the V block is locked and attached so as to sandwich the links on both outermost rows of the link row, and the V block holds the link row so that the link row is not disassembled. Endless belt for transmission configured with. 2. The endless transmission according to claim 1, wherein the V block is fitted between the pin portions of the link, and the link and the V block are fixed by the pin portions. belt. 3. The V block is fitted and fixed between the pin portions of one link, and another V block is fitted and fixed between the pin portions of adjacent links. An endless belt for transmission according to item 1 of the above. 4. The V block is fitted and fixed in a concave groove portion formed on the outermost row of links and contacting the side surface of the V block over substantially the entire width in the vertical direction. Endless belt for transmission. 5. A link string comprising a plurality of links and a V block fixed to the link string, the V block comprising:
An endless belt for transmission, which is pinched by a pulley and transmits power by a frictional force generated between the pulley and the both ends of the link, and is projected over substantially the entire width in the vertical direction. A convex portion is integrally formed, and a concave portion is formed between the insides of the convex portions, and the inner surface of the convex portion is formed by a rolling surface, and the convex portion of each link is further formed in the concave portion of an adjacent link. The rolling surfaces are engaged so that they come into contact with each other to form a multi-row / multi-node link row, and the V block is locked / mounted so as to sandwich the links on both outermost rows of the link row. , An endless belt for transmission configured to hold the link row so as not to be disassembled by the V block. 6. The endless belt for transmission according to claim 5, wherein the V block is fitted into the concave portion of the link, and the link and the V block are fixed by the convex portion. 7. A patent in which the V block is fitted and fixed in the recess of the link, and another V block is fitted between the V blocks, and the V blocks are continuously arranged so as to be in close contact with each other. The endless belt for transmission according to claim 5.