CN212839223U - Continuously variable transmission for small power machinery and single-pin-shaft continuously variable transmission chain applied to continuously variable transmission - Google Patents
Continuously variable transmission for small power machinery and single-pin-shaft continuously variable transmission chain applied to continuously variable transmission Download PDFInfo
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- CN212839223U CN212839223U CN202020851271.9U CN202020851271U CN212839223U CN 212839223 U CN212839223 U CN 212839223U CN 202020851271 U CN202020851271 U CN 202020851271U CN 212839223 U CN212839223 U CN 212839223U
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Abstract
The utility model relates to a single pin axle infinitely variable speed chain and use this infinitely variable speed chain be used for small-size power machinery's buncher, including conical disk shafting I, conical disk shafting II, single pin axle infinitely variable speed chain, speed adjusting mechanism and loading system. The chain links, the chain plates and the pin shaft components of the single-pin shaft stepless speed change chain are specifically arranged in proportion and shape, and meanwhile, the parts matched with the stepless speed change device are specifically arranged, so that the speed change performance of the stepless speed changer for the small power machinery is improved, the bearing capacity of the stepless speed changer for the small power machinery is increased, the stepless speed change chain is more suitable for the small and miniature power machinery, and the working efficiency and the stability of the small power machinery are improved.
Description
Technical Field
The utility model belongs to the gearbox field, concretely relates to a single pin axle infinitely variable speed chain that is used for small-size power machinery's buncher and is applied to it.
Background
A CVT transmission device applied to an automobile is characterized in that a chain or a steel belt surrounds between a movable cone disc and a fixed cone disc, and the working radius of the contact point of the chain or the steel belt and the cone discs is adjusted by changing the distance between the two cone discs, so that the speed change is realized. The transmission ratio of the gearbox is stable, and the design and the manufacture are simple and convenient.
Besides automobiles, many small power machines, such as small aircrafts and small self-propelled robots, also have requirements for application of a continuously variable transmission. However, the conventional CVT structure, especially the chain structure, cannot be further miniaturized, which hinders the application of the CVT to the field of small power machines.
The core components of the known CVT transmission are a transmission system consisting of a chain or a steel belt and a driving pulley and a driven pulley, and one of the obstacles of a continuously variable transmission for small power machines is the chain or the steel belt with smaller size and a cone disc system matched with the chain or the steel belt. Due to structural limitations of steel belts and more fixed processes, it is difficult to reduce the size of steel belts, and therefore a transmission element of a continuously variable transmission for a small power machine is desired on a chain.
PCT/DE2006/002053 "link chain", PCT/DE2006/001675 "link plate", chain comprising the link plate, chain drive formed by the chain and vehicle equipped with the chain drive "each disclose a pivot pin chain structure, and the pitch, the link plate, the hinge parts are optimally configured in relation to each other or in relation to each other. On the basis of this, german LuK developed a series of chain products with a link plate type of 0.8mm thickness. However, LuK company has developed a minimum chain pitch of 6mm and a minimum working radius of 25mm, and has not disclosed a more compact CVT and chain structure on a global scale.
The obstacle to the reduction of the working radius of the chain is the hinge construction by analysis of the construction. In order to suppress the polygon effect, the continuously variable transmission chain often employs a pivot pin chain as a hinge structure. However, the hinge structure of the swing pin chain is a pair of pin shafts, so that the pitch of the swing pin chain is further reduced, the moving range of the swing pin chain is limited by the swing pin structure, the swing pin chain cannot be flexibly bent, and the smaller minimum bending radius is realized. And a pair of special-shaped pin shafts are simplified into a special-shaped pin and a corresponding rolling structure on the chain plate, but the minimum bending radius cannot be further reduced due to the basic structural limitation.
The obstacles to further miniaturization of the chain are also the way and the location of the pins in the link plates. CN108167390A and CN108368915A disclose the structure and connection method of the stop pin for limiting the relative position of the pin shaft in the chain, which is also representative in the prior art. For the further reduced sizes of the chain and the pin shaft, the stop pin structure is difficult to realize.
US005728021 and EP1624225 disclose a structure in which pin shafts are fixed in a link plate in an interference manner, and friction transmission of a single pin shaft is realized by shortening the length of one of a pair of pin shafts, to some extent, improving transmission efficiency. However, the double-pin structure is still adopted, and the special-shaped pin is easy to loosen in interference fit, so that the long-time reliability is influenced, and the small-sized application is difficult to realize in engineering implementation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a small-size infinitely variable device, satisfies small-size power machinery to the demand of infinitely variable function.
The method is realized by the following technical means:
a continuously variable transmission for small power machinery comprises a conical disc shaft system I, a conical disc shaft system II, a single-pin shaft continuously variable transmission chain, a speed regulating mechanism and a pressurizing mechanism.
The cone disc shaft system I and the cone disc shaft system II both comprise a fixed cone disc and a movable cone disc; the single-pin shaft stepless speed change chain is clamped between a fixed cone disc and a movable cone disc of the cone disc shaft system I and the cone disc shaft system II and is used for transmitting power; the speed regulating mechanism is used for driving a movable conical disc of the conical disc shaft system I and/or the conical disc shaft system II to axially move; the pressurizing mechanism provides axial force required by the single-pin shaft stepless speed change chain for transmitting torque by applying pressure on the fixed cone disc and/or the movable cone disc.
The single-pin-shaft stepless speed change chain consists of a plurality of chain links; the whole length of the single-pin shaft stepless speed change chain in the working state is in a closed loop shape distributed on a plane, and the whole length of the single-pin shaft stepless speed change chain in the working state comprises an arc section and a straight line section connected with the arc section.
Each chain link comprises a plurality of chain plates, the chain plates are in a sheet shape, namely the size in one direction is obviously smaller than the sizes in the other two directions, the obviously smaller size is defined as the thickness of the chain plate, the size consistent with the motion direction of the straight-line section of the single-pin shaft stepless speed change chain is defined as the length of the chain plate, and the size vertical to the thickness of the chain plate and the length direction of the chain plate is defined as the height of the chain plate.
Each chain plate is provided with 2 through holes in the thickness direction of the chain plate, 1 pin shaft is arranged in each through hole, and two adjacent chain links are connected through 1 pin shaft arranged in the through hole; or each chain plate is provided with 1 long through hole formed by removing materials among 2 through holes, 2 pin shafts are arranged in each long through hole, and every two adjacent chain links are connected through 1 pin shaft arranged in the long through hole; two side surfaces of the end part of the pin shaft are parallel to the length direction of the chain plate on the straight line section and are obliquely arranged with a plane formed by the length direction and the height direction.
The outer diameters of the fixed cone disc and the movable cone disc of the cone disc shafting I are D1 (unit mm), and the outer diameters of the fixed cone disc and the movable cone disc of the cone disc shafting II are D2 (unit mm).
The speed ratio range (i.e., maximum reduction ratio/minimum reduction ratio) of the continuously variable transmission is i; the minimum pitch of the single-pin shaft stepless speed change chain is p (unit mm).
Preferably, two side surfaces of the end portion of the pin shaft are arranged to be inclined with respect to a plane formed by the length direction and the height direction of the link plate, and an angle formed by a tangent line of a midpoint of the side surface of the pin shaft in the height direction of the link plate on the plane formed by the height direction of the link plate and the thickness direction of the link plate and the plane formed by the length direction and the height direction of the link plate is not more than 15 degrees, not more than 7 degrees, preferably not more than 11 degrees, and not more than 9 degrees.
More than 90% of the area of the side surface of the pin shaft has a projection on a plane vertical to the length direction of the chain plate, and the curvature radius of the obtained projected curve is more than 80 mm.
Preferably, the main stress and connection matching part of the pin shaft is a cylinder, and the diameter of the cylinder is larger than or equal to that of the cylinder
Preferably, the width of the chain plate at the highest point of contact with the pin shaft in the height direction is greater than or equal to the width of the chain plate
The width of the chain plate at the lowest point of the contact of the chain plate and the pin shaft in the height direction is more than or equal to that of the chain plate
The width of the chain plate in the length direction of the chain plate is more than or equal to
Preferably, the surface of the pin shaft is provided with a ceramic layer except the side surface contacted with the fixed cone disc and/or the movable cone disc, the thickness of the ceramic layer is more than or equal to 5 nanometers, and the ceramic layer is made of one or a combination of more of aluminum oxide, zirconium oxide, titanium nitride, titanium carbide, titanium oxide and tungsten carbide.
Preferably, the thickness of the link plate is not less than
The sum of the thicknesses of all the chain plates on each section of the chain link is more than or equal to
Preferably, the maximum pitch of the single-pin shaft stepless speed change chain is less than or equal to 5.6 mm.
Preferably, when the input rotation speed of the continuously variable transmission is in a single direction, the movement direction of the chain is also in a single direction.
At least 2 link plates on the outer side of each link plate in the width direction of each link plate respectively pass through 2 pairs of through holes of 2 pin shafts on the link plates, and a pair of through holes in the back of each link plate in the motion direction of the link plate are in interference fit with the pin shafts.
Preferably, when the pin shaft is not in interference fit with the through hole in the chain plate, a fastening ring or a stop pin is additionally arranged on the outer side of the through hole on the pin shaft and is in interference fit with the pin shaft, or the pin shaft is fixedly connected in a welding mode, a bonding mode and the like, so that the chain plate is prevented from falling off.
Or when the input rotating speed of the continuously variable transmission is in a single direction, the moving direction of the chain is also in the single direction; two adjacent chain links are connected through 1 special-shaped pin shaft arranged in a through hole on the chain plate, the special-shaped pin shaft, namely a stressed and matched part of the pin shaft is a cylinder, a non-stressed part is provided with a special-shaped surface, and the special-shaped surface is preferably a plane; the front through hole of the chain plate is circular, and the rear through hole is in the shape corresponding to the pin shaft; the outer side is in interference fit with the pin shaft by a fastening ring or a stop pin, or is fixedly connected by welding, bonding and other modes;
the chain links are connected in a 2-chain link circulation or 3-chain link circulation arrangement mode.
Preferably, the chain plate material is alloy steel, and the alloy steel comprises the following chemical components in percentage by mass in addition to matrix iron and inevitable impurities: carbon: 0.55-0.75%, manganese: 0.3-1.2%, chromium: 0.4-1.2%, nickel: 0.3-1.0%, molybdenum: 0.05 to 0.2 percent; or the chemical components of the alloy steel, except matrix iron and inevitable impurities, further comprise the following components in percentage by mass: carbon: 0.45-0.55%, manganese: 0.70-1.2%, chromium: 0.9-1.2%, vanadium: 0.1 to 0.25 percent.
Furthermore, the single-pin shaft stepless speed change chain is arranged by adopting the arrangement mode of the single-pin shaft stepless speed change chain.
The utility model has the effects that:
in the prior art, 1 pair (2) of swing pins are used as the connection between chain links of the stepless speed change chain, and during the movement, 1 pair of pin shafts form rolling movement without sliding friction, but at the moment that the 1 pair of pin shafts are clamped between conical disks, the angles of the 1 pair of pin shafts are changed mutually, and the side surfaces of the pin shafts form sliding friction on the surfaces of the conical disks under larger axial pressure, so that the power loss is increased.
And the utility model discloses reduce the connection between the chain link, adopt 1 round pin axle to replace 1 to the round pin axle, with the link joint at the epaxial bending that realizes the chain that rotates of round pin, avoided 2 round pin hub connections to take place sliding friction under great axial pressure, and take place sliding friction under the condition of less chain pulling force, in chain CVT's oil film lubrication friction pair, axial pressure is about 10 times of the frictional force that produces (oil film drags typical coefficient of friction is 0.075-0.095), it can realize the inter-link connection to replace 2 round pin axles with 1 round pin axle, thereby effectively reduce friction loss, improve transmission efficiency.
2, the utility model discloses the connected mode of 1 specific round pin axle, the shape of cooperation round pin axle is the cylinder, takes place sliding friction under great axial pressure and less and conical disk area of contact's condition for the connected mode of 2 dysmorphism round pin axles among the well-known technique, because sliding friction takes place under less chain pulling force and great link joint and round pin axle area of contact's condition to can make wearing and tearing alleviate greatly.
3, through set up specific ceramic layer in the concrete position on round pin axle surface, can improve the wearability of part greatly, reduce frictional force.
4, through will not set up to the form of 1 microscler through-hole with round pin axle interference fit's link joint, can effectively alleviate link joint weight more than 20%.
5, by setting the width and the pitch of the chain plates, a smaller minimum working radius can be realized, and the realization of the continuously variable transmission for the small power machinery is facilitated; meanwhile, by matching with the connection mode of 1 pin shaft, the large polygon effect can be effectively avoided, the noise is reduced, and the service life of the chain is prolonged.
6, the cylindrical pin shaft is easier to manufacture and lower in cost.
Compared with the connection mode that 1 pair of special-shaped pin shafts roll oppositely and the chain plates are limited on the pin shafts by the stop pins in the prior art, the interference fit is utilized to limit the chain plates on 1 pin shaft, so that the structure is more reliable, the manufacture is easier, the consistency is better, and the cost is lower.
Compared with the prior art, the limit of the round pin shaft is realized by the stop pin, and the specific interference fit connection mode can more reliably ensure the meshing posture of the inclined side surface of the round pin shaft relative to the conical disc, so that more reliable transmission is ensured.
9, the smaller side inclination (9 degrees) makes the continuously variable transmission system more compact.
By setting the specific link plate thickness and the link plate total thickness, the bearing capacity of the chain can be ensured, and the compactness of a mechanical system can be ensured.
And 11, the component content of the existing alloy steel is specifically improved, wherein the specific content of carbon, manganese, chromium, nickel and molybdenum is adjusted, so that the chain has higher strength and better toughness and wear resistance, and is more suitable for being used in a small-sized continuously variable transmission.
Drawings
FIG. 1 is a schematic view of embodiment 1 of the present invention
Fig. 2 is the utility model relates to a single round pin axle infinitely variable speed chain operating condition straightway and circular arc section sketch map.
Fig. 3 is a three-dimensional structure diagram of the single-pin-shaft continuously variable transmission chain.
Fig. 4 is a schematic view of the bottom structure of the single-pin-shaft stepless speed change chain.
Fig. 5 is a side view schematically showing the single-pin continuously variable transmission chain.
Fig. 6 is the schematic view of the cross-sectional structure of the pin shaft on the plane perpendicular to the length direction of the chain plate.
Fig. 7 is a graph comparing the transfer efficiency (output power/input power) at input torques of 20n.m, 40n.m and 60n.m for example 1 and comparative example 1, respectively.
Fig. 8 is a three-dimensional schematic view of the link plate of the present invention.
Fig. 9 is a schematic view of an interference fit sequential arrangement manner of the pin shafts and the link plates in embodiment 2.
Fig. 10 shows an embodiment of a 3-link cyclic arrangement of pins and link plates.
Fig. 11 is a schematic view of a lightweight link plate with 1 elongated through hole according to an embodiment.
Fig. 12 is a schematic view of an embodiment of a special-shaped pin shaft matched with a corresponding chain plate.
Reference numerals: 01. the device comprises a power device, 02, a conical disc shafting I, 03, a pressurizing mechanism, 04, a single-pin-shaft continuously variable transmission chain, 041, a chain arc section in a working state, 042, a chain straight section in the working state, 05, a conical disc shafting II, 06 a speed regulating mechanism, 1, a chain link, 2, a chain plate, 21, the highest contact point of the chain plate and a pin shaft, 22, the lowest contact point of the chain plate and the pin shaft, 201, 209, 3, a pin shaft, 31, an inclined plane of the pin shaft, 3a, 3b, a cylindrical pin shaft, 3c, 3d, a special-shaped pin shaft and 4, and a fastening ring.
The letters used in the figures are for explanation of the dimensional relationships already mentioned and have the following meanings:
d1: the outer diameters of a fixed conical disc and a movable conical disc of a conical disc shafting I, D2 the outer diameters of the fixed conical disc and the movable conical disc of the conical disc shafting II, p the pitch of the single-pin-shaft stepless speed change chain, L the length of the chain plate, s: link plate thickness, h: link plate height, m 1: link joint width at the highest point of contact with the round pin axle in the link joint direction of height, m 2: link joint width at the lowest point of contact with the round pin axle in the link joint direction of height, m 3: link plate width in the link plate length direction, v: the direction of movement of the chain.
Detailed Description
Example 1
A continuously variable transmission for small power machinery is shown in figure 1, wherein a power device connected with the continuously variable transmission is a motor, and the continuously variable transmission comprises a conical disc shaft system I, a conical disc shaft system II, a single-pin shaft continuously variable transmission chain, a speed regulating mechanism and a pressurizing mechanism; the cone disc shaft system I and the cone disc shaft system II both comprise a fixed cone disc and a movable cone disc; the power is transmitted between the conical disc shafting I and the conical disc shafting II through a single-pin shaft stepless speed change chain, and the single-pin shaft stepless speed change chain is clamped between a fixed conical disc and a movable conical disc of the conical disc shafting I and the conical disc shafting II; as shown in fig. 2 to 4, the single-pin shaft stepless speed change chain is composed of a plurality of chain links; the link plates are arranged according to the mode shown in fig. 10 (namely, the connection mode of 3-link circulation); the overall length of the single-pin shaft stepless speed change chain in the working state is a closed loop distributed on a plane, and the overall length of the single-pin shaft stepless speed change chain in the working state comprises an arc section and a straight line section connected with the arc section; each chain link comprises a plurality of chain plates, the chain plates are in a sheet shape, namely the size in one direction is obviously smaller than the sizes in the other two directions, the obviously smaller size is defined as the thickness of the chain plate, the size consistent with the motion direction of the straight-line section of the single-pin shaft stepless speed change chain is defined as the length of the chain plate, and the size vertical to the thickness of the chain plate and the length direction of the chain plate is defined as the height of the chain plate.
Each chain plate is provided with 2 through holes in the thickness direction of the chain plate, and two adjacent chain links are connected through a pin shaft arranged in the through holes; two side surfaces of the end part of the pin shaft are parallel to the length direction of the chain plate on the straight line section, and are arranged in an inclined way with a plane formed by the length direction and the height direction, and the inclination angle is 9 degrees.
The outer diameters of the fixed cone disc and the movable cone disc of the cone disc shaft system I are 60mm, and the outer diameters of the fixed cone disc and the movable cone disc of the cone disc shaft system II are 70 mm. The continuously variable transmission has a speed ratio range (i.e., maximum reduction ratio/minimum reduction ratio) of 5. The minimum pitch of the single-pin shaft stepless speed change chain is 4.5 mm.
The round pin axle is the cylinder, and the diameter is 2 mm. And the projection of more than 90% of the area of the side surface of the pin shaft on a plane vertical to the length direction of the chain plate, and the curvature radius of the obtained projection curve is 100 mm.
Comparative example 1
In the comparative example, the conical disc shafting I, the conical disc shafting II, the speed regulating mechanism and the pressurizing mechanism which are consistent with those in the embodiment 1 are adopted, the single-pin-shaft stepless speed change chain in the embodiment 1 is changed into a known-structure swing pin chain, the hinge structure is a pair of opposite pin shafts, and the other settings are the same as those in the embodiment 1; the minimum pitch of the oscillating pin chain is 6.5mm, the width is 24mm, and the thickness of the chain plate is 0.7 mm.
Comparative example 1 is assembled with the same motor as example 1, the input torque is 20N.m, 40N.m and 60N.m respectively, when the input rotation speed is 2000rpm, the CVT speed ratio is 2, 1.5, 1 and 0.5 respectively, the transmission efficiency (output power/input power) of example 1 and comparative example 1 is higher than that of comparative example 1 basically under the condition that the input torque and the speed ratio are set, and the efficiency advantage of the single-pin shaft stepless speed change chain is more obvious compared with the swing pin chain with the known structure under the condition that the transmission efficiency of example 1 and comparative example 1 are set, the CVT speed ratio is 2 under the condition that the input torque and the speed ratio are set, the sliding friction of the swing pin chain structure relative to the conical disc surface is increased due to the increase of the axial pressure of the shaft II and the smaller working radius of the shaft I under the condition that the pitch limit, and the efficiency advantage of example 1 can reach 3%; when the speed ratio of the CVT is 0.5, the efficiency advantage reaches 2% due to the smaller working radius of the shaft II; with the increase of the input torque, the whole input power is increased due to the constant rotating speed, and the power loss of the comparative example 1 tends to be smaller relative to the whole power.
Example 2
Unlike embodiment 1, the inclination angle of the middle part of the side link plate in the height direction of the pin shaft of the single pin shaft continuously variable transmission in this embodiment to the plane formed by the length direction and the height direction of the link plate was 11 degrees. As shown in fig. 8, the width m1 of the link plate at the highest point of the link plate in the height direction, which is in contact with the pin shaft, is 1.8mm, the width m2 of the link plate at the lowest point of the link plate in the height direction, which is in contact with the pin shaft, is 2mm, the width m3 of the link plate in the length direction is 2.5mm, the thickness of the link plate is 1.2mm, and the sum of the thicknesses of all the link plates on each link is 10.8mm, and the material of the link plate is alloy steel. The pin shaft limits the chain plates by interference fit, the chain plates are arranged as shown in fig. 9 (namely 2-link circulation), the moving direction v of the chain is defined from right to left in one link unit in the width direction of the chain, the sequence of the interference fit of the pin shaft and the chain plates is that the chain plates 201, 203, 205, 207 and 209 are in interference fit with the pin shaft 3b from the upper end and the lower end of the chain, and the chain plates 202, 204, 206 and 208 are in interference fit with the pin shaft 3 a. In another embodiment, as shown in fig. 12, 3c and 3d are two adjacent shaped pins.
Comparative example 2
Comparative example 2 a single pin shaft continuously variable transmission chain structure in accordance with example 2 was used, and a better comparative operation was achieved by a link plate changing operation, in comparative example 2, a link plate of a roller chain of a known single pin shaft structure was used as the link plate, the link plate thickness was 1.2mm, the sum of the thicknesses of all the link plates in each link was 10.8mm, the link plate width m1 at the highest point of the link plate in the height direction in contact with the pin shaft was 1.4mm, the link plate width m2 at the lowest point in the height direction in contact with the pin shaft was 1.4mm, the link plate width m3 in the length direction of the link plate was 1.4mm, and the link plate material was 45 Mn.
Compared example 2 and example 2 assemble the same motor, the life test is carried out on the same test bed, the input rotating speed is 1500rpm, the same input torque is 40N.m, the CVT speed ratio is from 2 to 0.5, speed is adjusted once every 2h, example 2 passes the 100h bed test, the dismounting chain is good, compared example 2, abnormal sound appears when the CVT speed ratio is 0.9, the transmission system fails, the dismounting finds that the chain fails, the chain plate breaks, and the running time is 23 h.
Claims (10)
1. A continuously variable transmission for a small power machine,
the device comprises a conical disc shaft system I, a conical disc shaft system II, a single-pin shaft stepless speed change chain, a speed regulating mechanism and a pressurizing mechanism;
the cone disc shaft system I and the cone disc shaft system II both comprise a fixed cone disc and a movable cone disc; the single-pin shaft stepless speed change chain is clamped between a fixed cone disc and a movable cone disc of the cone disc shaft system I and the cone disc shaft system II and is used for transmitting power; the speed regulating mechanism is used for driving a movable conical disc of the conical disc shaft system I and/or the conical disc shaft system II to axially move; the pressurizing mechanism provides axial force required by the single-pin-shaft stepless speed change chain for transmitting torque by applying pressure on the fixed cone disc and/or the movable cone disc;
the single-pin-shaft stepless speed change chain consists of a plurality of chain links; the overall length of the single-pin shaft stepless speed change chain in the working state is a closed loop distributed on a plane, and the overall length of the single-pin shaft stepless speed change chain in the working state comprises an arc section and a straight line section connected with the arc section;
each chain link comprises a plurality of chain plates, the chain plates are in a sheet shape, namely the size in one direction is obviously smaller than the sizes in the other two directions, the obviously smaller size is defined as the thickness of the chain plate, the size consistent with the motion direction of the straight-line section of the single-pin shaft stepless speed change chain is defined as the length of the chain plate, and the size vertical to the thickness of the chain plate and the length direction of the chain plate is defined as the height of the chain plate;
each chain plate is provided with 2 through holes in the thickness direction of the chain plate, 1 pin shaft is arranged in each through hole, and two adjacent chain links are connected through 1 pin shaft arranged in the through hole; or each chain plate is provided with 1 long through hole formed by removing materials among 2 through holes, 2 pin shafts are arranged in each long through hole, and every two adjacent chain links are connected through 1 pin shaft arranged in the long through hole;
two side surfaces of the end part of the pin shaft are arranged in a way that the straight line section is parallel to the length direction of the chain plate and is inclined with a plane formed by the length direction and the height direction;
the outer diameters of the fixed cone disc and the movable cone disc of the cone disc shafting I are D1 and are in unit mm, and the outer diameters of the fixed cone disc and the movable cone disc of the cone disc shafting II are D2 and are in unit mm;
the speed ratio range of the continuously variable transmission is i; the minimum pitch of the single-pin shaft stepless speed change chain is p and the unit is mm.
2. The continuously variable transmission for a small power machine according to claim 1,
two side surfaces of the end part of the pin shaft are obliquely arranged with a plane formed by the length direction and the height direction of the chain plate, and an angle formed by a tangent line of an arc line obtained by the projection of the side surface of the pin shaft on the plane formed by the height direction and the thickness direction of the chain plate at the midpoint of the chain plate in the height direction and the plane formed by the length direction and the height direction of the chain plate is less than or equal to 15 degrees and more than or equal to 7 degrees;
more than 90% of the area of the side surface of the pin shaft has a projection on a plane vertical to the length direction of the chain plate, and the curvature radius of the obtained projected curve is more than 80 mm.
3. The cvt for a small power machine as in claim 1, wherein the main force and connection fitting part of the pin is a cylinder with a diameter greater than or equal to the diameter of the cylinder
4. The continuously variable transmission for a small power machine according to claim 1,
the width of the chain plate at the highest point of contact with the pin shaft in the height direction is greater than or equal to that of the chain plate
The width of the chain plate at the lowest point of the contact of the chain plate and the pin shaft in the height direction is more than or equal to that of the chain plate
The width of the chain plate in the length direction of the chain plate is more than or equal to
5. The variable transmission for the small power machine according to claim 1, wherein a ceramic layer is provided on the surface of the pin shaft except for a side surface in contact with the fixed cone disc and/or the movable cone disc, the ceramic layer has a thickness of 5 nm or more, and the ceramic layer is made of one or a combination of alumina, zirconia, titanium nitride, titanium carbide, titanium oxide, and tungsten carbide.
6. The continuously variable transmission for small power machines according to claim 1, wherein the thickness of the link plate is equal to or greater than
The sum of the thicknesses of all the chain plates on each section of the chain link is more than or equal to
7. The continuously variable transmission for small power machines according to claim 1, wherein a maximum pitch of the single-pin continuously variable transmission chain is 5.6mm or less.
8. The continuously variable transmission for a small power machine according to claim 1,
when the input rotating speed of the stepless speed changer is in a single direction, the moving direction of the chain is also in the single direction; at least 2 link plates on the outer side of each link plate in the width direction of each link plate respectively pass through 2 pairs of through holes of 2 pin shafts on the link plates, and a pair of through holes in the front and the rear of each link plate in the motion direction of each link plate are in interference fit with the pin shafts;
alternatively, the first and second electrodes may be,
when the input rotating speed of the stepless speed changer is in a single direction, the moving direction of the chain is also in the single direction; two adjacent chain links are connected through 1 special-shaped pin shaft arranged in a through hole on the chain plate, the special-shaped pin shaft, namely a stressed and matched part of the pin shaft is a cylinder, and a non-stressed part is provided with a special-shaped surface; the front through hole of the chain plate is circular, and the rear through hole is in the shape corresponding to the pin shaft; the outer side is in interference fit with the pin shaft by a fastening ring or a stop pin, or is fixedly connected by welding, bonding and other modes;
the chain links are connected in a 2-chain link circulation or 3-chain link circulation arrangement mode.
9. The stepless speed changer for the small power machine as claimed in claim 8, wherein when the pin shaft is not in interference fit with the through hole on the link plate, a fastening ring or a stop pin is additionally arranged on the outer side of the through hole on the pin shaft to be in interference fit with the pin shaft, or the pin shaft is fixedly connected by welding or bonding, so that the link plate is prevented from falling off; the special-shaped surface is a plane.
10. A single-pin continuously variable transmission chain applied to a continuously variable transmission for a small power machine, characterized in that it is set in the manner of setting the single-pin continuously variable transmission chain according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020851271.9U CN212839223U (en) | 2020-05-20 | 2020-05-20 | Continuously variable transmission for small power machinery and single-pin-shaft continuously variable transmission chain applied to continuously variable transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020851271.9U CN212839223U (en) | 2020-05-20 | 2020-05-20 | Continuously variable transmission for small power machinery and single-pin-shaft continuously variable transmission chain applied to continuously variable transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212839223U true CN212839223U (en) | 2021-03-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112709793A (en) * | 2020-05-20 | 2021-04-27 | 杭州肇鹏科技有限公司 | Continuously variable transmission for small power machinery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709793A (en) * | 2020-05-20 | 2021-04-27 | 杭州肇鹏科技有限公司 | Continuously variable transmission for small power machinery |
| CN112709793B (en) * | 2020-05-20 | 2023-12-12 | 杭州肇鹏科技有限公司 | Stepless speed changer for small power machine |
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