JPS61127948A - Transmission v-belt - Google Patents

Abstract

PURPOSE:To aim at the dispersion of power transmission load, by performing the engagement between a V-type block and an endless belt with a convexo- concave engagement between upper and lower surfaces of the endless belt and a pressure-contact surface of the side. CONSTITUTION:A lower block 30 of a V-type block 28 is engaged with an engaged concave part 30f on an inner surface of a connecting part 30c from an inner circumferential surface of an endless belt 20 in a way of holding this endless belt 20 embracively with symmetrical arms 30a and 30b. In addition, an engaged convex part 29a on an inner surface of an upper block 29 is engaged with an engaged concave part 22 on an outer circumferential surface of the endless belt 20. With this constitution, compressive stress to be produced on the endless belt 20 is reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission V-belt used in a V-belt type continuously variable transmission and the like.

[Conventional technology]

Conventionally, this type of transmission V-belt has an endless belt with a V-shaped cross section, and the V-shaped inclined surface is frictionally engaged with the V-groove facing surface of the pulley, but the belt tends to deteriorate due to frictional heat. For this reason, in recent years, V-belts have been used in which a large number of ■-shaped blocks made of a material resistant to frictional heat are successively arranged in the longitudinal direction of an endless belt.

Figure 1 shows a belt with V-shaped blocks applied to a continuously variable transmission for a motorcycle, in which a fixed pulley half 2 and a movable pulley half 3 are provided on a drive shaft 1 connected to a drive source. a variable diameter transmission V-pulley 4 on the driving side, and a fixed pulley half-rest provided at the inner end of a fixed pulley shaft 7 rotatably supported via bearings 6a, 6b on a driven shaft 5 connected to the rear wheel. A belt 11 with a V-shaped block is installed between a driven side variable diameter transmission Dv pulley 10 consisting of a movable pulley half 9 and a movable pulley half 9, and the rotation of the drive shaft 1 is transferred to the driven side via the V belt 11. The width of the V-shaped annular groove of the V-pulleys 4, 10 is varied in accordance with the rotational speed of the drive shaft 1, and the diameter of the 100-Dari pulleys 4, 10 is changed to achieve continuously variable speed.

As shown in FIG.
A rubber endless belt 14 containing a tensile core material 13 is engaged between the grooves b, and a large number of V-shaped blocks 12 are continuously arranged in the longitudinal direction of the endless belt 14, so that the inclined surfaces of both sides of the V-shaped blocks 120 are The V-shaped annular grooves of the V-shaped pulleys 4 and 10 are frictionally engaged with opposing surfaces, and tensile force is transmitted by the fitting force of the uneven engagement portion between the V-shaped block 12 and the endless belt 14.

[Problem that the invention seeks to solve]

In this case, as shown in FIG. 3, when tension F acts on the belt, a component force N is generated in the axial direction, and this component force N is applied between the inner peripheral surface of the endless belt 14 and the lower arm 12b of the ■-shaped block 12. acts, compressive stress is generated in the endless belt 14, and compressive stress is also generated in the opposite direction to the traveling direction at the concave-convex engaging portion of the ■-shaped block 12 and the endless belt 14.

Therefore, compressive deformation is applied by multiple elements to the engaging portion on the inner circumferential side of the endless belt 14, which causes the rubber portion to buckle or wear out, and even cause cracks around the tensile core material.
There is a problem that the durability of the belt is deteriorated.

Therefore, an object of the present invention is to reduce the load applied to the engaging portion of the endless belt and improve the durability of the V-belt.

[Means for Solving Problem C] In order to achieve the above object, the present invention continuously arranges a large number of V-shaped blocks in the longitudinal direction of an endless belt in a convex-concave engagement manner, and In a power transmission V-belt that is used by frictionally engaging the V-groove opposing surface of each pulley,
The endless belt has a tensile core material inside in the longitudinal direction, and has a locking recess in the width direction on the outer peripheral surface and a locking protrusion in the width direction on the inner peripheral surface, and at least one side surface in the longitudinal direction. The V inclines toward the inner circumference in the radial direction.
The V-shaped block has a crimping surface and an inclined surface inclined toward the outer periphery in the radial direction, respectively, while the V-shaped block has an upper portion provided with a locking protrusion that engages with a locking recess on the outer peripheral surface of the endless belt. The lower parts of the left and right arms, each of which has a block and an inclined surface that frictionally engages with the groove facing surface of the pulley on the outside, are connected by a connecting part, the upper surface is open, and the inner circumference of the endless belt is formed on the inner surface of the connecting part. A locking concave portion that engages with the locking convex portion of the face is formed, and a crimped surface that engages with the crimping surface of the endless belt on the left and right internal surfaces of the vagina, and a crimped surface that engages with the crimping surface of the endless belt on the inner surface of the joint between the left and right arms and the connecting portion. and a lower block in which escape grooves are formed, respectively, and the lower block is held by the left and right arms from the inner peripheral surface of the endless bell 1 to lock the inner surface of the connecting part. The concave portion is locked to the locking convex portion of the endless belt, the locking convex portion on the inner surface of the upper block is locked to the locking concave portion on the outer circumferential surface of the endless belt, and the upper block and the lower block are placed above the endless belt. It is characterized by the fact that it was concluded.

[For production]

Thereby, the engagement between the ■-shaped block and the endless belt is performed by the uneven engagement on the upper surface of the endless belt and the crimping surface on the side surface, so that the power transmission load can be distributed.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 4 to 6.

The endless belt 20 is made of a flexible material such as rubber,
A tensile core material 21 is installed inside in the longitudinal direction, and a ■-shaped block locking recess 22 with a trapezoidal cross section is formed on the outer peripheral surface 20a of the tensile core material 21.
V-shaped block locking convex portions 23 having a substantially arcuate cross section are formed on b, respectively, and crimping surfaces 24 that slope toward the inner circumference in the radial direction are formed on both sides.
．． 25 and inclined surfaces 26 and 27 that are inclined from slightly above the center toward the outer circumference in the radial direction, and are formed in a hexagonal cross section.

The V-shaped block 28 has an upper block 29 and a lower block 3.
It consists of 0.

The upper block 29 has a locking convex portion 29a on its lower surface that engages with a locking recess 22 formed on the outer peripheral surface 20a of the endless belt 20, and belt cooling air introduction grooves 29b and 29G at the front and rear portions of the upper surface, respectively. A pin insertion hole 29d is formed in the center of the side surface and extends through both sides.

The lower block 30 has a substantially U-shape in which the lower parts of the left and right arms 30a and 30b are connected by a connecting part 30C and the upper surface is open.
The left and right arms 30a, 30b are provided with inclined surfaces 30d, 3Qe on the outside thereof, which frictionally engage with the groove facing surface of the pulley, respectively.
The inner peripheral surface 20 of the endless belt 20 is attached to the inner surface of the connecting portion 30c.
In addition to forming a locking recess 30f that engages with the locking protrusion 23 formed in b, crimping surfaces 24 and 25 are formed on the inner surfaces of the left and right arms 30a and 30b on both sides of the endless belt 2o.
formed respectively on the pressure bonded surfaces 300 and 30h that engage with the
Relief pads 30i and 30j are provided on the inner surfaces of the respective engagement portions of the left and right arms 30a and 30b and the connecting portion 30C, and
Furthermore, the left and right arms 30a.

Engagement 1 with two upper blocks extending upward of 30b
Pin insertion holes 30m and 30n are bored in 11130 and 30J, respectively.

This lower block 30 is connected to the left and right arms 30a of the lower block 30 from the inner peripheral side of the endless belt 20.

30b holds the endless belt 20 and presses the crimping surfaces 24 and 25 of the endless belt 20 onto the lower block 3, respectively.
Pressure bonded surfaces 3 provided on the inner surfaces of the left and right arms 30a and 30b of 0
0 to I and 30h, and the locking concave portion 30f on the inner surface of the connecting portion 30c is locked to the locking convex portion 23 formed on the inner circumferential surface 20b of the endless belt 2o.

At this time, there is a gap (,
+ is formed, and a gap C2 is also formed between the front and rear ends of the connecting portion 30c and the inner circumferential surface 20b of the endless belt 20, so that the lower block 30 and the endless belt 20 are locked.

Then, the two upper blocks are attached to the engaging arm 30 of the lower block 30 between 30J and the locking protrusion 29a of the upper block 29.
The locking recess 22 on the outer peripheral surface 20a of the endless belt 20
The lower block 30 and the upper block 2
The two are fastened with a pin 31 above the endless belt 20, and the locking portions 31a and 31b at both ends of the pin 31 are attached to the engagement arm 30 of the lower block 3°, and a pin locking groove 300.30D is formed on the outside of the belt 301. 11:

At this time, a gap C3 is formed between the outer circumferential surface 20a of the endless belt 20 and the inner surface of the upper block 29, and they are locked.

In this way, the ■-shaped block 28 is attached to the endless belt 2.
The transmission V-belt 32 is configured by continuously arranging it in the longitudinal direction of 0.
Ru.

The power transmission form of the transmission V-belt 32 includes a concave-convex engagement portion between the outer circumferential surface 20a and the inner circumferential surface 20b of the endless belt 20, crimping surfaces on both side surfaces of the endless belt 20, and a crimping surface 30q of the lower block 30.

30h, the transmission load can be distributed.

Further, the locking convex portion 23 of the inner circumferential surface 20b of the endless belt 20 and the locking recess 30 of the connecting portion 30c of the lower block 30
The reason why the gap C1 is formed between the endless belt 2o and the f is that when the endless belt 2o is only supported on the side, the endless belt 20 may warp downward when the load is large due to the component force N caused by the action of the tension force F mentioned above. Yes, and if they are engaged without a gap C1, the result will be endless bells 1 to 20.
Compressive stress is generated on the inner circumferential side. Further, if the crimp surface 24.25 of the endless belt 2o is bent, a gap is created in the crimp surface 24.25, and compressive stress is generated on the inner circumferential side of the endless belt 20.

Therefore, the lower engagement portion between the endless belt 20 and the lower block 30 is engaged with the engagement convex portion 23 of the endless belt 20 at the front and back of the engagement recess 30f so that the load in the belt traveling direction is supported. A gap C1 is provided in the center to allow the belt to fall.

Further, as shown in FIG. 5, there are inclined surfaces 30d, 30 that frictionally engage with the V-shaped annular grooves of the pulleys on both sides of the lower block 30.
The angle α formed by The purpose is to reduce warping, thereby reducing the compressive stress of the belt, and the left and right arms 30a of the lower block 30.

It is possible to improve the rigidity by increasing the strength near the connecting portion between the connecting portion 30b and the connecting portion 30c.

Note that the relationship between the angle α and the angle β only needs to be α≦β.

Furthermore, when attaching the V-shaped block 28 to the endless belt 20, that is, to the engaging arm 30 of the lower block 30,
When fitting the two upper blocks between the two upper blocks 30j and fastening them with the pin 31, attach the V-shaped block 28 to the endless belt 20 with a predetermined tension. From the outer peripheral surface 2 of the endless bell 1-20
0a)More shrinking force is applied, but the endless belt 20
Since inclined surfaces 26 and 27 are formed on both sides of the outer circumferential side of the endless belt 20, the outer circumferential side of the endless belt 20 is
It deforms in seven directions and absorbs compressive force, improving durability without increasing the compressive stress inward from the bell 1.

In addition, the endless belt 2
A gap C4 is formed between the 0 and ■-shaped blocks 28, and when the block is bitten by the pulley and curved, this gap lXIC
4, outside air is introduced to cool the endless belt 20 and improve its durability.

Since the locking recesses 22 are formed on the outer circumferential surface 20a of the endless belt 20, and the locking protrusions 23 are formed on the inner circumferential surface 20b at corresponding positions above and below, the minimum cross-sectional area of the endless belt is made as large as possible. This makes it possible to reduce tensile stress and reduce the vertical height of the V-shaped block 28 in the longitudinal direction, making it compact.

Furthermore, when the ■-shaped blocks 28 are continuously arranged in the longitudinal direction of the endless belt 20, cold FIU wind introduction grooves 29 are formed in the front and rear parts of the two upper blocks of the V-shaped blocks 28, respectively.
Since b and 29c are provided, the continuous upper block 2
A cooling air inlet C5 is formed between 9.29 and air is introduced through this inlet C5 when the belt is driven, and a gap C3 is also provided between the inner surface of the upper block 29 and the outer peripheral surface 20a of the endless belt 20. Yes, and also endless belt 2
Since a gap C4 is formed on both sides of the gap C4, the introduced air is sent from the gap C5 to C3,0,< and cools the outer circumferential surface 20a of the endless belt 20.

On the inner peripheral surface 20b side of the endless belt 20, the left and right arms 30a, 30b of the lower block 30 and the connecting portion 30c
Since relief grooves 301° 30j are provided on the inner surface of the joining portion, air is introduced into these relief grooves 30i and 30j, and the central part of the locking convex portion 23 of the endless belt 20 and the locking recess 30f of the lower block 30. The gap C1 is the clearance groove 30i, 3
Since it is in communication with Oj, the uneven engagement portion on the inner peripheral surface 2Ob side of the endless belt 20 can be cooled. Furthermore, since a gap C2 is provided between the inner circumferential surface 20b of the endless belt 20 and the front and rear ends of the connecting portion 30G of the lower block 30, the endless belt 20 can be easily bent. The inner circumferential surface 20b comes into contact with air and is cooled.

In this way, when the belt is driven, each ll!
Since the endless belt 20 and the square block 28 are cooled by C+, C2, C3, C4, and Cs during the two hours, the progress of deterioration due to heat generated during driving can be significantly reduced.

In the above embodiments, the ■-shaped block made of resin was explained, but it may be made of metal or non-metal. For example, if the upper block is made of aluminum alloy, etc., a lightweight block with good heat dissipation properties can be obtained. can.

In addition, although the bottle was explained using a hollow pin, it may be a solid bottle, and although the bottle is locked by bending the locking portions at both ends of the bottle, it may be fully or partially caulked. The locking strength can be improved by inserting a washer or the like into the bottom block, and it is also possible to glue the bottle, lower block, and upper block to each other, and insert the bottle into the insertion hole of the engaging arm of the lower block. It is also possible to melt the vicinity of both ends of the hole to prevent the bottle from being removed.

In addition, although the locking concave and convex portions of the endless belt are described as having a locking recess with a trapezoidal cross section on the outer circumferential surface and a locking convex portion with a substantially circular arc cross section on the inner circumferential surface, both may have a trapezoidal cross section or a substantially circular arc cross section. good.

(Effects of the Invention) As described above, the present invention includes a large number of ■-shaped blocks that are continuously disposed in the longitudinal direction of an endless belt in a concave-convex engagement manner, and the sloped surfaces on both sides of the ■-shaped blocks are respectively aligned with the surfaces facing the ■grooves of the pulleys. In the transmission V-belt used in frictional engagement, the endless belt has a tensile core material inside in the longitudinal direction, and has a locking recess in the width direction on the outer peripheral surface and a locking protrusion in the width direction on the inner peripheral surface. At the same time, at least one of the longitudinal side surfaces is formed with a crimping surface with the ■-shaped block that slopes toward the inner circumference in the radial direction and an inclined surface that slopes toward the outer circumference in the radial direction. 1! is an upper block provided with a locking protrusion that engages with a locking recess on the outer peripheral surface of the endless belt, and a V-groove facing surface of the pulley on the outside. The lower parts of the left and right arms are connected to the engaging inclined surface by a connecting part, the upper surface is open, and the inner surface of the connecting part has a locking recess that engages with the locking convex part on the inner circumferential surface of the endless belt. At the same time, a crimped surface that engages with the crimped surface of the endless belt is formed on the inner surface of the left and right arms, and relief grooves that steal the flesh are formed on the inner surface of the engagement portion between the left and right arms and the connecting portion. Remove the bottom block from the inner peripheral surface of the endless belt, hold the endless belt with your right arm, and use the locking recess on the inner surface of the connecting part to lock the endless belt. The upper block is locked to the protrusion, the locking protrusion on the inner surface of the upper block is locked to the locking recess on the outer circumferential surface of the endless belt, and the upper block and lower block are fastened above the endless belt. In addition to reducing the compressive stress generated in the belt, the load on the uneven engagement portion during power transmission can be reduced, and the belt can also be cooled, reducing the progress of deterioration due to the heat generated when the belt is driven. , which can significantly improve durability.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a continuously variable transmission for a motorcycle, Fig. 2 is a partial sectional view of a conventional V-block equipped bell 1, and Fig. 3 is the tension generated in the belt and its component force. 4 to 6 show an embodiment of the present invention, FIG. 4 is a partially sectional side view, and FIG. 5 is a cross-sectional side view of FIG. 4.
The sectional view, FIG. 6, is a sectional view taken along VI-Vl in FIG. 4. 20...Rubber endless belt 20a...
Outer circumference of the belt 20b... Inner circumference of the belt 21.
... Tensile core material 22 ... Locking recess 23 ... Locking convex portion 24.25 ... Crimping surface 28 ... Two ■-shaped blocks ... Upper block 29a ...
Locking convex portion 30...lower block 30a, 30
b...Left and right arms 30c...Connection part 30d,
30e... Sloped surface on both sides of the arm 30f... Locking recess on the inner surface of the connecting part 30q, 30h... Pressure bonded surface 3
1...Bin 32...Transmission V-belt patent application Person Honda Motor Co., Ltd. agent Patent attorney Kido (Tobe A Wagga 1st prisoner)

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. The endless belt has a tensile core material inside in the longitudinal direction, and has a locking recess in the width direction on the outer peripheral surface and a locking protrusion in the width direction on the inner peripheral surface, and at least one side surface in the longitudinal direction. A crimping surface with the V-shaped block that slopes toward the inner circumference in the radial direction and an inclined surface that slopes toward the outer circumference in the radial direction are respectively formed on the V-shaped block.
The shaped block has an upper block having a locking convex portion that engages with a locking concave portion on the outer peripheral surface of the endless belt, and an inclined surface on the outside that frictionally engages with the V-groove facing surface of the pulley. The lower portions of the arms are connected by a connecting portion, the upper surface is open, and a locking recess that engages with a locking convex portion on the inner peripheral surface of the endless belt is formed on the inner surface of the connecting portion, and the endless belt is formed on the inner surface of the left and right arms. It is composed of a crimped surface that engages with the crimped surface of the belt, and a lower block that has relief grooves formed on the inner surface of the connecting portion between the left and right arms and the connecting portion, and the lower block is connected to the endless belt. Hold the endless belt between the left and right arms from the inner circumferential surface of the endless belt, and lock the locking recess on the inner surface of the connecting part to the locking protrusion of the endless belt. A power transmission V-belt, which is locked in a locking recess on the outer peripheral surface of the belt, and has an upper block and a lower block fastened above the endless belt.