JPS6182039A - Transmission v-belt - Google Patents

Abstract

PURPOSE:To secure the transmission of a driving force by constituting the captioned belt so that an endless belt and a V-shaped block contact and engage each other free from the gap between the contact surfaces of the convex and concaved engagement parts when the V-belt is laid onto a pulley and bent. CONSTITUTION:A V-shaped block 46 has an endless-belt nipping part between the both arms 46a and 46b, and the engaging convex parts 46e and 46f having a circular section which are engaged with the endless belt 47 are formed in the nipping part, and the engaging concaved parts 47a and 47b having a circular section are formed onto the endless belt 47 corresponding to the engaging convex parts 46e and 46f. The convex and concaved engagement parts of the V-shaped block 46 and the endless belt 47 are constituted so that a gap is formed in the center part when the endless belt 47 is set flat. Said gap is set so as to become zero when the V-belt is laid onto a pulley and bent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to (1) a power transmission V-belt used in a belt-type continuously variable transmission, etc.;

[Conventional technology]

Conventionally, this type of V-belt has an endless belt with a V-shaped cross section, and the V-shaped inclined surface is connected to the pulley's V"
Previously, the belt was frictionally engaged with the facing surface of the groove, but since the belt tends to deteriorate due to frictional heat, in recent years endless belt gripping parts have been formed on both sides of the ■-shaped block made of a material that is resistant to frictional heat. A 4M structure is used in which a pair of endless belts are engaged with each other in a concave and convex manner in the holding portion, and a large number of V-shaped blocks are successively arranged in the longitudinal direction of the endless belt.

This belt with V-shaped blocks is, as shown in Fig. 1,
An endless belt 2 made of a flexible material such as rubber and having a tensile core material 1 therein has recesses 3a on the outer peripheral surface 2a and inner peripheral surface 2b, respectively.
3b is formed, and convex portions 4a and 4b are formed on the upper and lower insides of the ■-shaped block 4, respectively, and the convex portions 4a and 4b are engaged with the concave portions 3a and 3b of the endless 2, thereby forming the V-shaped block 4. A large number of belts are arranged continuously in the longitudinal direction of the endless belt 2.

[Problem that the invention seeks to solve]

But on! In the case of SI], the recess 3 of the endless belt 2
a, 3b and a convex portion 4a of the V-shaped block 4 that engages therewith,
4b have approximately the same curvature, so when the V-belt is wound around the pulley and bent, the contact between the V-shaped block 4 and the endless belt 2 is as shown in FIG. On the outer circumferential surface 2a of the belt 2, the contact surfaces between the convex portion 4a of the V-shaped block 4 and the concave portion 3a of the endless belt 2 are in line contact only at the center, and a gap is created between both starting ends. Or on the inner peripheral surface 2b, the four parts 3 of the endless belt 2
Since b is strongly pressed against the convex portion 4b of the ■-shaped block 4, the stress distribution becomes extremely uneven, causing elongation and uneven wear of the endless belt 2, which poses problems to the durability of the belt. There is.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention 1 continuously disposes a large number of ■-shaped blocks in the longitudinal direction of the endless belt in a concave-convex engagement manner, and the sloped surfaces on both sides of the V-shaped blocks are used as the surfaces facing the grooves of the pulleys. In a power transmission V-belt used in a thick friction engagement, when the endless belt is flattened, the contact surface of the engagement protrusion of the ■-shaped block that engages with the engagement recess on the outer periphery of the endless belt is engaged. The contact surfaces of the engaging protrusions of the ■-shaped block that engage the four retaining parts on the inner periphery of the endless belt have gaps at both starting ends, respectively, with a gap in the center. It is characterized in that it is formed so that the central portion thereof is brought into contact engagement with each other.

[For production]

Therefore, when the V-belt is wound around the pulley and bent, the contact surfaces of the concave-convex engaging portions of the endless belt and the V-shaped block are brought into contact with each other without any gaps, thereby ensuring the transmission of driving force. .

〔Example〕,.

An embodiment of the present invention applied to continuously variable transmission of a motorcycle will be described with reference to FIGS. 3 to 7.

The drive 81N111 connected to the drive source is provided with a variable diameter transmission pulley 12 on the drive side. This V pulley 12
consists of a fixed pulley half 13, a movable pulley half 14, and a sprocket 15 which is a gear member disposed between both pulleys 13 and 14, and the fixed pulley half 13 has a conical surface 16 on one side. The drive shaft 11 is formed on a board having
The sprocket 15 is fixed to the end of the guide boss 17 fixed to the drive shaft 11, and is disposed between the fixed pulley half 13 and the movable pulley half 14. The half-rest 14 is formed into a short cylindrical shape with a conical surface 18 on one side, and is fitted onto the guide boss 17 so as to be movable in the axial direction. A facing UV-shaped annular groove 19 is formed into which the V-belt 20 is inserted and clamped between the opposing conical surfaces 16.18.

A roller guide plate 21 is fixed to the other end of the guide boss 17, and a tapered name 24 that gradually narrows in the radial direction is formed by an inclined surface 22 of this guide plate 21 and an inclined surface 23 formed on the back surface of the movable pulley half-rest 14. A plurality of centrifugal rollers 25 are accommodated in the tapered groove 24 in a floating state. When the drive shaft 11 is rotated and its rotational speed increases, several centrifugal rollers 2 receive centrifugal force.
5 moves radially outward, moving the movable pulley half rest 14 in the direction approaching the fixed pulley half rest 13 (to the left in FIG. 3).
This allows the radius of engagement of the V-belt 20 with the conical surface 16.18 to be increased.

Follow! The IJ@26 is provided with a variable diameter transmission V pulley 27 on the driven side. This pulley 27 consists of a fixed pulley shaft 30 supported by bearings 28 and 29 fitted to the driven shaft 26, and a fixed pulley half fixed to the inner end of this pulley @30 (on the right side in Fig. 3). A fixed pulley body 31, a driven sprocket 32 which is a gear member fixed to the fixed pulley half 31, and a movable pulley shaft 33 fitted to the outer circumference of the fixed pulley @30 so as to be movable in the axial direction. The fixed pulley half 31 and the movable pulley half 34 have conical surfaces 35.3 facing each other.
6 are formed, and the V-belt 20 is inserted into the square annular groove 37 formed between these conical surfaces 35 and 36, and is held between the conical surfaces 35 and 36. As a result, the V-belt 20 is mounted between the drive-side variable-diameter transmission V-pulley 12 and the driven-side variable-diameter transmission V-boo 92.

The movable pulley shaft 33 of the movable pulley half 34 has a long hole 38 extending in the axial direction, and three guide bins protruding from the fixed pulley shaft 30 are rotatably inserted into the long hole 38. The supported guide roller 40 is engaged, and the movable pulley shaft 33 is guided by the elongated hole 38 and the guide roller 40 so that it can move left and right in the axial direction.

A drive plate 1-42 including clutch ways 1 to 41 is fixed to the outer end (left end in FIG. 3) of the fixed 1111f f-rear 30, and this drive plate 42
A #Jl coil spring 43 is contracted around the movable pulley half-rest 341z, and urges the movable pulley half-rest 34 to approach the fixed pulley half 31.

A clutch outer 44 is fixed to the outer end (left end in FIG. 3) of the driven shaft 26, and the driven side fixed pulley shaft 30
When the number of rotations of the drive plate 42 exceeds a predetermined value, the drive plate 42
A clutch shoe 45 fixed to the outer periphery of a clutch weight 41 that is pivotally supported so as to be rotatable in the radial direction contacts the inner circumferential surface of the clutch outer 44, and the clutch outer 4
The sub-l that rotates together with 4! Rotate 1lIN126.

V-belt 20 that transmits the rotation of the drive shaft 11 to the driven wheel 26
As shown in FIGS. 4 and 5, a pair of endless belts 47, 47 are sandwiched on both sides of the V-shaped block 46,
A large number of these V-shaped blocks are successively arranged in the longitudinal direction of the endless belt 47, 47.

The V-shaped block 46 connects the upper and lower bj 46a, 46b with a central connecting part 46c, forms a beltless belt clamping part between both arms 46a, 46, and has both sides of the tip
It is formed on an inclined surface 46d that engages with the surface facing the groove of the pulley in an H-shape.

Engagement convex portions 46e and 46f each having an arcuate cross section that engages with the endless belt 47 are formed on the endless belt clamping portion formed between both 11) i146a and 46, respectively, and the lower part of the lower arm 46b. are the teeth that mesh with the teeth 15a, 32a of the fIII teeth h15, 32.

Endless belt 47. /17 is pile core material 48 respectively
A canvas 49 is attached to the lower surface of each of the rectangular front legs, and engagement recesses 47a and 47b each having an arcuate cross section are formed at corresponding positions on the upper and lower surfaces.

This endless belt 47.47 is inserted from both sides of the ■-shaped block 46, and the engagement convex part 46e of the upper arm 46a of the V-shaped block 46 is engaged with the engagement concave part 47a on the upper surface which is the outer peripheral surface of the endless belt 47. And ■ lower arm of the shape block 4
The ■-shaped block 4 is assembled by engaging the engaging convex portion 46f of the endless belt 47 with the lower surface engaging portion 47b, which is the inner peripheral surface of the endless belt 47.
6 holds the endless belt 47.47.

As shown in FIG. 5, when the endless belt 47 is flattened, the engaging convex portion 46e of the V-shaped block 46 is formed on the outer circumferential side of the endless belt 47. and endless belt 47
The engaging recesses 47a have gaps at the center portions 460 and 47c, and /I6h, 461 and 47d at both starting ends, respectively.
47e to contact and engage, and on the inner peripheral side of the endless belt 47, both starting ends 46j, 46 of the ■-shaped block 46 [
The two starting ends 47f and 47q of the endless belt 47 are in contact with the central portions 464 and 47h with a gap rT.

When the V-belt 20 is wound around the pulley and bent, the V-shaped block 46 is bent as shown in FIG.
The engagement protrusions 46e and 46f of the endless bells i to 47 and the engagement recesses 47a and /i7b of the endless bells i to 47 have gaps 1j'l, respectively.
l'vE <contact engagement.

In this way, a large number of Cv-shaped block blocks 46 are successively arranged in the longitudinal direction of the endless belt 47 to form the V-belt 20. This V-belt 2° is mounted between the drive side variable diameter transmission pulley 12 and the vertical drive side variable diameter transmission boot 92.

With the above configuration, the V-shaped block 46 and the endless belt 47 smoothly engage with each other to transmit the driving force, so that the stress distribution is made uniform and reliable transmission is possible, and the belt elongates. The occurrence of uneven wear is suppressed,
Improves durability.

Next, to explain the operation of the continuously variable transmission configured in this way, when the rotation of the drive shaft 11 is low, the interval between the V-shaped annular grooves 19 of the drive side variable diameter transmission pulley 12 widens; In the variable diameter transmission V pulley 27 on the driven side, the movable pulley half 34 is urged in the direction of the fixed pulley half rest 31 by the spring 43, so the interval between the V-shaped annular grooves 37 is narrow, and the V belt 20 is shown in the upper half of FIG.
6b is in contact with the teeth 15a of subrocket]-15, and is in a state of engagement with the large diameter V pulley 27 on the driven side.
The rotation of the drive shaft 11 is from the drive shaft 11 to the sub [1 butt 15
It is transmitted to the teeth 46b of the V-belt 20 through the teeth 15a of the V-belt 20, and
d and 46d to the conical surfaces 35 and 36 of the fixed pulley half-rest 31 and the movable pulley half-rest 34 of the driven side V-pulley 27, and this rotation is transmitted to the clap outer 44 via the dry plate 42 and then The driving wheel 26 is rotated.

As the rotation of the drive shaft 11 increases, the distance between the V-shaped annular i seedlings of the drive side pulley 12 becomes narrower.
The V belt 20 is attached to the V pulley 1 as shown in the lower half of FIG.
2 with a gradually larger diameter, and thereby the driven side ■ pulley 27
The movable pulley half 34 moves away from the fixed pulley half 31 against the spring 43, the interval between the ■-shaped annular grooves 37 becomes wider, and the V-belt 20 gradually engages the driven-side V-pulley 27 with a smaller diameter, until the maximum In rotation, the V-belt 20 is connected to the V-shaped block 4
46b is meshed with the tooth 32a of the sprocket 32 under the sprocket 6. Therefore, the rotation of the drive shaft 11 is transmitted to the sprocket 32 on the driven side by the lower arm 46b of the ■-shaped block 46 of the V belt 20 via the V belt 20 that engages with the drive side V pulley 12 with a large diameter, and is transmitted to the drive side sprocket 32. 42, the driven wheel 26 is rotated at an increased speed via the clutch outer 44.

Therefore, in the case of a low ratio, the driving side is the do + i + /
I 6 b J, mainly geared transmission, centrifugal roller 2
5't/iji! ；Cl ritual movement is auxiliary, and the driven side is gooseberry: Nogu・i 3 to J, ruV blood friction transmission and C
When using the hull R ratio, the drive side is centrifugal [1-Ra 25 V side! ? Hole transmission, driven side is sprocket 32 and V belt-20'7) V L-1 lock 46 (7) lower M
46b and the southern transmission, and the spring 43 is the V-plane J? [Rubbing] The movement? lIi], and the C driving force can be transmitted reliably.

By configuring as described above, the V belt 20 is attached to the drive side V pulley 12 or the driven side pulley 27 with a small diameter.
Cj also V-belt 2o V-shaped block 46 1 arm 4
6b meshes with the sprocket 15 (1415a) or the south 32a of the sprocket 32, so rotation can be reliably transmitted without slippage occurring in the V-belt 20, and the durability of the parts is also improved.

In the above example, the V-belt is mounted between the drive-side and driven-side V-pulleys equipped with sprockets, but it is of course applicable to conventionally used pulleys. Further, in addition to the structure in which a pair of endless belts are held between the two sides of a square block, a structure in which a single endless belt of wood is held by a V-shaped block may also be used.

〔Effect of the invention〕

As described above, in the present invention, a large number of V-shaped blocks are continuously disposed in the longitudinal direction of an endless belt in a concave-convex engagement manner, and both inclined surfaces of the V-shaped blocks are aligned with the V-groove facing surfaces of the pulleys. i
! In a transmission V-belt that is used in frictional engagement,
When the endless belt is flattened, the contact surface of the engagement protrusion of the V-shaped block that engages with the engagement recess on the outer periphery of the endless belt has a gap in the engagement center, and both starting ends are in contact and engagement. The contact surfaces of the engagement protrusions of the V-shaped tabs that engage with the engagement recesses on the inner periphery of the endless belt have gaps at both starting ends of the engagement blocks so that the center portions contact and engage. Therefore, when the V-belt is bent by being bent by the pulley, the concave-convex engaging portions of the endless belt and the V-shaped block #i contact and engage without any gaps.
■The stress valve (1) between the shaped block and the endless belt is equalized and the driving force can be reliably transmitted, suppressing belt elongation and uneven wear and improving durability.

[Brief explanation of the drawing]

Figures 1 and 2 show conventional power transmission V-belts, so Figure 1 is a cross-sectional view showing the engaged state of the endless belt and V-shaped block when the endless belt is flattened, and Figure 2 is a cross-sectional view of the endless belt and the V-shaped block. A cross-sectional view showing a bent state, the third
7 to 7 show an embodiment of the present invention, FIG. 3 is a cross-sectional view of a continuously variable speed motorcycle to which an embodiment of the present invention is applied, and FIG. Cross-sectional view of the belt, No. 5
The figure is a cross-sectional side view showing the uneven engagement between the endless belt and the V-shaped block when the endless belt is flattened.
The figure is a cross-sectional side view showing the engagement state between the endless belt and the ■-shaped block when the endless belt is bent, and FIG. 7 is a cross-sectional view showing the engagement state between the flexible diameter transmission V-pulley and the V-belt. . 12... Drive side variable diameter transmission V pulley 20...
V-belt 27... Driven side variable diameter transmission ■Pulley 4
6...V-shaped block 46a...upper arm 46b
...Lower arm 46d...Frictional engagement inclined surface 46e
. 46f... Engagement convex portion 46a, 461... Center portion 46h, 46i, 46j, 46k... Starting end portion 47...
・Endless belt 47a...outer circumferential engagement recess
47b...Inner peripheral side engagement recess 47C, 47h -
...Central part 47d, 47e, 47f, 47' Q
...starting end

Claims (1)

[Claims] 1. A power transmission V-belt in which a large number of V-shaped blocks are continuously disposed in a longitudinal direction of the endless belt in a concave-convex engagement manner, and the sloped surfaces on both sides of the V-shaped blocks are frictionally engaged with the V-groove facing surfaces of the pulleys. When the endless belt is flattened, the contact surface of the engagement protrusion of the V-shaped block that engages with the engagement recess on the outer periphery of the endless belt has a gap in the engagement center, and both starting ends are in contact and engagement. The contact surfaces of the engaging convex portions of the V-shaped blocks that engage with the engaging concave portions on the inner circumference of the endless belt are formed such that there is a gap at both engagement start ends, and the central portions are in contact engagement. A power transmission V-belt that is characterized by: