CN213176657U - Double-sided toothed V belt - Google Patents

Abstract

The utility model provides a double-sided tooth V area, this double-sided tooth V area has symmetrical upper cog profile and lower cog profile, and include line "L" and arc "A", line "L" and arc "A" are from the center of tooth root to the center of neighbouring addendum, the upper cog is according to L-A-L-A-L, lower tooth is according to A-L-A-L tangent and connect, double-sided tooth V area's thickness is 12mm ~ 14mm, the upper cog height is 2.2mm ~ 3.0mm, the ratio of upper cog height and upper cog pitch top distance is 0.5 ~ 0.7, the ratio of wheel abdomen thickness and area thickness is 0.28 ~ 0.4, the ratio of the length of upper cog L1 plus the radius sum of A1 and the radius of A2 plus the length sum of L3 is 0.5 ~ 0.7, the angle that the upper cog formed along the both sides of double-sided tooth V area length direction is 21 ~ 25, the angle that the lower cog forms along the both sides of double-sided tooth V area length direction is 22, the number of the upper teeth is 1.0-1.2 times of the number of the lower teeth, and the double-sided tooth V belt fills the blank of a stepless speed change belt for a pedal motorcycle with the displacement of 200cc to 450cc in China.

Description

Double-sided toothed V belt

Technical Field

The utility model relates to a two-sided tooth V area especially relates to infinitely variable two-sided tooth V area for scooter.

Background

Infinitely variable speeds are widely used in motorcycles, such as utility vehicles, all terrain vehicles, skis, and the like. The stepless speed change belt is matched with the clutch to form a stepless speed change system, so that the transmission system can be accelerated and decelerated stably. The layout of the system is a 2-wheel transmission system, and a driving wheel transmits power to a driven load wheel through a stepless speed change V belt. The driving wheel is a clutch V-shaped belt wheel, after the main shaft rotates, the clutch rotor generates an inward acting force under the action of centrifugal force, and when the acting force is large enough to overcome the resistance of the spring, the clutch V-shaped disc starts to move inwards, so that the position of a speed change V-shaped belt pitch line is pushed to move upwards along the side face of the belt wheel. The driven wheel is also a clutch V-shaped belt wheel, and the principle of the driven wheel is similar to that of the driving wheel. Along with the movement of the clutch disc of the driving wheel and the driven wheel, the position of the speed change V belt in the diameter direction is continuously changed, so that the speed ratio is also continuously changed, and the transmission speed ratio is generally 2.4-0.8, which is the principle of stepless speed change.

The motorcycle displacement in the current market is mainly concentrated on a light motorcycle below 150cc meeting daily use requirements, and the adopted stepless speed change belt is of a single-sided tooth structure with the general thickness of about 8-10 mm, or a part of large-displacement motorcycles, mainly four-wheel motorcycles, adopts stepless speed change driven by chains. The part of the large-displacement stepless speed change V belt is designed into a double-sided tooth structure, the lower tooth is designed into a deeper big tooth, the whole thickness of the V belt is generally more than 14.5mm, such as patent CN102165217B granted by Ganz company, Japanese patent publication JP2005265106A and US patent US4410314B granted by the Ganz company, so as to meet the requirement of transmission load and the requirement of flexibility of the V belt.

The current market popularizes the middle and small displacement stepless speed change motorcycle with the displacement of 200cc to 450cc, but the stepless speed change belt for the motorcycle with the displacement is relatively vacant, the direct adoption of the speed change belt for the motorcycle with the large displacement wastes space, and the economy is not good, the belt bearing capacity with smaller thickness is insufficient, and the stepless speed change belt is not, but if the stepless speed change belt with the large thickness is adopted to reduce the size of the belt in proportion, the flexibility of the belt is insufficient, and the bearing capacity can not meet the requirements, so the middle and small displacement stepless speed change motorcycle belt with the displacement of 200cc to 450cc does not have proper double-sided V belt which can be used and referred, and the current situation is urgently needed to be solved by providing a novel stepless speed change belt.

SUMMERY OF THE UTILITY MODEL

The utility model provides a double-sided V-belt, which is provided with a plurality of upper teeth and upper tooth-shaped profiles which are alternately arranged on upper tooth roots;

a plurality of lower teeth and lower tooth roots are alternately arranged to form a lower tooth profile;

and a plurality of bearing parts between the upper tooth root and the lower tooth root;

characterized in that said upper tooth profile is symmetrical and comprises a line L and an arc A, said line L and arc A being connected tangentially according to L1-A1-L2-A2-L3 from the center of the upper tooth root to the center of the adjacent upper tooth crest;

the lower tooth profile is symmetrical and comprises a line L and an arc A, the line L and the arc A being tangentially connected according to A3-L4-A4-L5 from the center of the lower tooth root to the center of the adjacent lower tooth tip;

the thickness of the double-sided V-shaped belt is 12 mm-14 mm;

the upper tooth height is 2.2 mm-3.0 mm;

the ratio of the upper tooth height to the upper tooth pitch-to-top distance is 0.5-0.7;

the ratio of the thickness of the wheel belly to the thickness of the belt is 0.28-0.4;

the ratio of the sum of the length of the upper tooth L1 and the radius of A1 to the sum of the radius of A2 and the length of L3 is 0.5-0.7;

the angle formed by the two side edges of the upper teeth along the length direction of the double-sided V-belt is 21-25 degrees;

the angle formed by the two side edges of the lower teeth along the length direction of the double-sided V-belt is 22-28 degrees;

the number of the upper teeth is 1.0-1.2 times of the number of the lower teeth.

Preferably, the radius of the lower tooth root is 1.0 mm-1.5 mm.

Preferably, the pitch of the upper teeth is 9mm to 10 mm.

Preferably, the angle formed by the two side edges of the upper tooth is 23 °.

Preferably, the angle formed by the two side edges of the lower teeth along the length direction of the double-sided toothed V-belt is 26 °.

Preferably, the thickness of the V-belt is 13mm to 14 mm.

Preferably, the pitch-to-crest distance of the upper teeth is 3.5 mm-4.5 mm.

Preferably, the upper teeth and the lower teeth are covered with nylon canvas.

Adopt the utility model discloses the double-sided tooth V area of structure is because it is lower to go up the tooth height, lower tooth broad, though thickness is little than the infinitely variable speed motorcycle area of prior art, nevertheless can satisfy the requirement that the motorcycle took pliability and bearing capacity still, fills the blank in the infinitely variable speed area for the pedal motorcycle of domestic market 200cc to 450cc discharge capacity, has better application prospect.

Drawings

Fig. 1 and fig. 2 are schematic structural diagrams of the present invention.

Detailed Description

For ease of understanding and description, the present invention first describes some symbols, where a represents an arc and L represents a line, where L1 represents a first segment in a contour, and depending on the context, L1 may also represent the length of that segment, and a1 represents the first arc in the series of contours. For a symmetric profile, only half of the repeating unit is represented, as the other half is a mirror image of the first half.

The utility model relates to a double-tooth V belt with go up tooth profile and lower tooth profile, this goes up tooth profile and has the LALALAL of sequence, and this lower tooth profile has the ALAL of sequence. The utility model discloses an it is by last root of tooth center to the order at the last crest of tooth center of adjacency to go up the tooth profile: L1-A1-L2-A2-L3, the lower tooth profile being in the order from the lower root center to the adjacent lower tip center: A3-L4-A4-L5, all the straight lines are connected with the arcs in a tangent mode, and because the arcs are connected with the straight lines in a tangent mode, stress concentration is reduced, and cracking from the connection position is avoided. Therefore, the profiles of the upper teeth and the lower teeth are in a trapezoidal structure, namely the upper tooth root, the side edges of the upper teeth and the lower teeth and the upper tooth crest and the lower tooth crest are all provided with flat structures, and the transmission joint surface of the belt is increased, as shown in fig. 2.

As shown in fig. 1 and 2, the diameter of the cord of the double-sided toothed V belt is D, the upper tooth height H2 is the distance from the upper tooth root to the upper tooth crest, H1 is the lower tooth height, PLD1 is the distance from the upper tooth crest to the center of the cord, i.e., the upper tooth pitch crest distance, the thickness W of the load-bearing part, i.e., the web, is the vertical distance between the upper tooth root and the lower tooth root, the total thickness H of the belt is the distance from the upper tooth crest to the lower tooth crest, the upper tooth pitch P2 is the distance from the center of the upper tooth root to the center of the adjacent upper tooth root, and the above distances are all the straight distances of the double-sided toothed V belt in. From the above, H is H1+ H2+ W.

The utility model discloses in, the total thickness H of tooth is between 12 ~ 14mm, it is 2.2mm to 3.0mm to go up tooth height H2, it is within 0.5 to 0.7 scope to go up the ratio of tooth height H2 and last tooth pitch-top PLD1, the value of preferred PLD1 is 3.5mm ~ 4.5mm, guarantee the size stability of belt transverse section, avoid belt cross-section middle cotton rope to sink and destroy the risk of cross-section support stability, undertake partial transmission load simultaneously; by adopting the lower upper teeth, the flexibility of the top is increased, so that the stress concentration of the top is effectively eliminated, and the cracking of the top and the tooth root is prevented. The ratio of the thickness W of the wheel belly to the thickness H of the belt is 0.28-0.4, and the flexibility requirement and the transmission performance of the belt are guaranteed.

When the upper teeth are too wide, the flexibility of the upper teeth is insufficient; go up too narrow then stress release of tooth and horizontal rigidity relatively poor, because the utility model discloses a trapezoidal last tooth and last tooth root, the ratio of going up the length of tooth L1 and adding the radius R1 sum of A1 and the radius R2 of A2 and adding the length sum of L3 is 0.5 ~ 0.7, adopts this kind to go up the whole wide profile of tooth that is greater than slightly in last tooth's socket, finds through the test that pliability and fracture all obtain good solution, sees following static test data. The upper tooth pitch P2 is preferably 9-10 mm, and the number of the upper teeth is 1.0-1.2 times of the number of the lower teeth.

The angle B2 formed by the two sides of the upper teeth along the length direction of the belt is 21-25 degrees, preferably 23 degrees, and the angle B1 formed by the two sides of the lower teeth along the length direction is preferably 22-28 degrees, preferably 26 degrees. The inclination of tooth diminishes down, and lower tooth root is the circular arc excessive, and lower tooth root radius is preferred 1.0mm ~ 1.5mm, increases the whole width of tooth down, and then has increased down the driven area of contact of tooth, has guaranteed the stability of drive belt width direction size.

For increasing protection tooth portion, cover nylon fiber canvas outside upper and lower tooth, go up the canvas of tooth and protect on the one hand and go up the tooth, make it be difficult to the fracture, on the other hand is favorable to going up the shaping of tooth, and tooth is difficult for the fracture under the protection of lower tooth canvas, protects the tooth bottom rubber simultaneously and is difficult for receiving external environment and destroys, increases the durability in area.

Preferably, the aramid fiber ropes with high strength, low shrinkage and excellent stability are adopted as the ropes, so that the dimensional stability of the products in the length direction is ensured, and the damage of rubber materials due to tensile stress is reduced.

And a bottom transmission rubber layer is arranged between the thread rope and the lower tooth crest, the rubber layer is preferably made of high-abrasion-resistance, high-temperature-resistance and high-hardness ethylene rubber, and the rubber layer and the thread rope together bear main transmission load.

The utility model discloses a two-sided tooth V area is through the rack dynamic test under the condition of maximum torque 36N.m, 6200RPM, and the life-span is 1 ten thousand meters and does not break to the standard, and the area 10700 kilometer that 12mm is thick seriously splits, and 14 mm's area 12100 kilometer breaks, and 13 mm's area 23800 kilometer slightly splits, therefore the utility model discloses a two-sided tooth V area is thick is fit for 12mm to 14mm, and area thickness is less than 12mm can't balance compliance and transmission load's requirement; above 14mm, the bottom of the belt is prone to cracking. The thickness of area is the most optimized between 13mm to 14mm, and dynamic test is seen from this, the utility model discloses a durability has also satisfied the requirement through the test verification when the area satisfies the space requirement.

In static pliability test, the belt is crooked naturally when interval to 5mm at the bottom of the tooth, surveys the resilience force of belt, and the resilience force in test prior art double-sided tooth V area is 8N ~ 11N, and the resilience force in this tooth belt is 5N ~ 7N, because the resilience force is little then the pliability in description area is good, consequently the utility model discloses a pliability in the double-sided tooth V area of prior art of pliability in tooth belt is good.

Claims (10)

1. A double-sided toothed V-belt having an upper toothed profile with a plurality of upper teeth alternating with upper roots;

a plurality of lower teeth and lower tooth roots are alternately arranged to form a lower tooth profile;

and a plurality of bearing parts between the upper tooth root and the lower tooth root;

characterized in that said upper tooth profile is symmetrical and comprises a line L and an arc A, said line L and arc A being connected tangentially according to L1-A1-L2-A2-L3 from the center of the upper tooth root to the center of the adjacent upper tooth crest;

the lower tooth profile is symmetrical and comprises a line L and an arc A, the line L and the arc A being tangentially connected according to A3-L4-A4-L5 from the center of the lower tooth root to the center of the adjacent lower tooth tip;

the thickness of the double-sided V-shaped belt is 12 mm-14 mm;

the upper tooth height is 2.2 mm-3.0 mm;

the ratio of the upper tooth height to the upper tooth pitch-to-top distance is 0.5-0.7;

the ratio of the thickness of the wheel belly to the thickness of the belt is 0.28-0.4;

the ratio of the sum of the length of the upper tooth L1 and the radius of A1 to the sum of the radius of A2 and the length of L3 is 0.5-0.7;

the angle formed by the two side edges of the upper teeth along the length direction of the double-sided V-belt is 21-25 degrees;

the angle formed by the two side edges of the lower teeth along the length direction of the double-sided V-belt is 22-28 degrees;

the number of the upper teeth is 1.0-1.2 times of the number of the lower teeth.

2. The double-sided toothed V-belt according to claim 1, wherein said lower tooth root has a radius of 1.0mm to 1.5 mm.

3. The double sided toothed V-belt of claim 2 wherein said upper teeth have an upper tooth pitch, said upper tooth pitch being between 9mm and 10 mm.

4. The double sided tooth V-belt as in claim 3, wherein the angle formed by the two sides of said upper tooth is 23 °.

5. The double-sided toothed V-belt according to claim 4, wherein the angle formed by the two side edges of the lower teeth along the length direction of the double-sided toothed V-belt is 26 °.

6. The double-sided toothed V-belt according to claim 1, wherein said V-belt has a thickness of 13mm to 14 mm.

7. The double-sided toothed V-belt according to claim 1, wherein said upper tooth pitch distance is 3.5mm to 4.5 mm.

8. The double-sided toothed V-belt according to claim 1, wherein said upper and lower teeth are covered with nylon canvas.

9. The double-sided toothed V-belt of claim 1, wherein the cord of the double-sided toothed V-belt is an aramid cord.

10. The double-sided toothed V-belt of claim 1, wherein the bottom drive rubber layer of the double-sided toothed V-belt is vinyl rubber.

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