WO2012010042A1

WO2012010042A1 - Rudder-shaped roller gear and arched-surface-enveloped gear engaged drive structure

Info

Publication number: WO2012010042A1
Application number: PCT/CN2011/076375
Authority: WO
Inventors: 朱豪东
Original assignee: Zhu Haodong
Priority date: 2010-07-20
Filing date: 2011-06-27
Publication date: 2012-01-26
Also published as: CN102338202A

Abstract

A rudder-shaped roller gear and arched-surface-enveloped gear engaged drive structure is disclosed. Rollers (3-1, 3-2) are equidistantly installed in the drive mating surface of the rudder-shaped roller gear (1), and the profile of the arched-surface-enveloped gear (2) is a surface of revolution formed by a concave arc revolving around the axis of the gear. On the surface of revolution there are helical rail grooves which can be engaged with rollers (3-1, 3-2). The rudder-shaped roller gear (1) and the arched-surface-enveloped gear (2) are simultaneously engaged by several rollers (3-1, 3-2), and the arched-surface-enveloped gear (2) forms an envelope to the rudder-shaped roller gear (1). Compared with a gear transmission, the structure has advantages of large transmission ratio, stable running, compact structure, small volume and no noise; and compared with a worm transmission, the structure changes the sliding friction between the gear teeth of the worm and the worm wheel into the rolling friction of the rollers, such that the structure has advantages of small abrasion, long service life, high efficiency, low energy consumption, large loading force and large designed transmission ratio range. The manufacturing of the rudder-shaped roller gear processes the gear teeth without using the way of rolling the teeth and inserting the teeth, but processes the assembled structure using the simple drilling, milling and twisting way, such that the manufacture cost is low.

Description

Rudder-shaped roller wheel arc bread wheel meshing transmission structure

Technical field

The invention relates to a power transmission structure. The transmission meshing surface of the rudder roller wheel is equidistantly mounted with a rolling roller. The shape of the arc bread roller is a rotating surface formed by a concave arc around the axis of the wheel, and the rotating surface has a The spiral track groove of the meshing roller, the rudder roller wheel and the arc bread wheel are simultaneously meshed and driven by a plurality of rollers, and the arc bread wheel forms an envelope with the rudder roller.

Background technique

The commonly used variable speed transmission structure has gear set transmission and worm drive. The gear set has high transmission efficiency, accuracy and reliability. It is widely used in transmission mode, but it has poor stability during high-speed operation, high noise, can not buffer vibration, and is bulky at large reduction ratio. Disadvantages; worm drive has the advantages of large reduction ratio, compact structure, stable operation, no noise, buffer vibration, 90 degree change direction, etc., and is widely used in various deceleration equipment and mechanical transmission, but The worm drive is driven by the friction of the tooth surface between the worm and the worm wheel. Therefore, its inherent disadvantages are large wear, low transmission efficiency, poor precision, short service life and high energy consumption. The transmission ratio of the worm drive structure is generally 10 or more, if the transmission ratio is required to be less than 10, it is very difficult to design and manufacture. In the ordinary cylindrical worm drive process, only 1-2 teeth carry the transmission force, so its bearing capacity is weak, it is not suitable for large heavy equipment; later the ring-wound worm technology, the worm and the worm wheel mesh during the transmission process. The number of teeth increases, the bearing capacity becomes larger, but the processing is difficult, the process is complicated, the effect is not good, and the tooth surface friction of the worm gear is still transmitted, so the problems of large wear of the common worm drive and low transmission efficiency still exist. .

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and to provide a novel rudder-shaped roller-wheel-curved bread-wound wheel meshing transmission structure, which has stable operation, compact structure, small volume, no noise, and low wear. High efficiency, low energy consumption, large bearing capacity, and a wide range of transmission ratios can be designed.

In order to achieve this goal, the technical solution of the present invention is realized as follows: a rudder-shaped roller-wheel-arc bread-wound meshing transmission structure, which is composed of a rudder-shaped roller wheel and an arc-shaped roller wheel, and a rudder-shaped roller The wheel comprises a roller carrier wheel, a roller, a planetary roller and a roller limiting device; on the transmission meshing circumferential surface of the roller carrier wheel, there are equally spaced roller mounting holes of the same structure, the roller mounting holes The center line is on the same cross section of the roller carrier wheel and passes through the center of the roller carrier wheel; a plane of the roller carrier wheel is concentric with the roller carrier wheel, and the annular groove depth limits the roller a portion can be inserted therein; the roller includes an engaging portion, a bearing portion and a limiting portion, the three portions are rotating bodies formed around the same central axis, the engaging portion has a cross section larger than the carrying portion cross section, and the engaging portion end portion can be a flat head Or a round head; after the roller is installed in the roller mounting hole, the bearing portion is in the roller mounting hole, the limiting portion protrudes into the annular groove, and the engaging portion is higher than the outer circumferential surface of the roller carrier wheel With The spiral track groove on the bread wheel is meshed; the bearing portion of the roller is in the roller mounting hole, and the planetary roller is installed around the roller; the roller mounting hole, the planetary roller and the roller shaft are closely matched to form a bearing structure, The roller mounting hole is equivalent to the outer ring of the bearing, and the roller is equivalent to the inner ring of the bearing; the limiting portion of the roller is connected with the roller limiting device in the annular groove, so that the roller can be in the roller mounting hole The center of the planetary roller rotates but cannot be separated from the roller mounting hole; the roller carrier wheel with the roller mounted is shaped like a rudder of a ship, called a rudder roller; the shape of the curved bread wheel is concave. The arc surface formed by the circular arc around the central axis of the arc bread wheel, the rotating surface can form an envelope for the rudder-shaped roller wheel, which is called a concave arc-turning bread wheel, referred to as an arc bread wheel; The diameter of the circular arc is equal to the diameter of the roller carrier wheel; the spiral track groove is formed on the rotating surface of the curved bread wheel, the pitch of the spiral track groove is equal; the longitudinal section shape specification of the normal section of the spiral track groove and the meshing portion of the roller Consistent, making the spiral track groove and roll The meshing portion can be optimally meshed; the rudder roller wheel and the central axis of the arc bread wheel are interlaced at 90 degrees, and the central axis of the arc bread wheel is in the same plane as the central axis of each roller of the rudder roller wheel. The central moment of the rudder roller and the arc bread wheel causes the roller engaging portion to just engage the spiral track groove of the arc bread wheel, and the arc bread wheel forms an envelope with the rudder roller.

The rudder-shaped roller-wheel-rolling bread-wound wheel meshing transmission structure is characterized in that when the outer circular surface of the bearing portion of the roller is a conical surface, it is called a tapered roller, and the roller on the outer circumferential surface of the roller carrier wheel The mounting hole is a tapered hole, and the tapered roller mounting hole communicates with the annular groove; correspondingly, the planetary roller is a tapered planetary roller, and the outer circular surface is also a conical surface, the bearing portion of the roller, the tapered roller The outer apex of the mounting hole and the tapered planet roller is the center of the roller carrying wheel.

The rudder-shaped roller-wheel-rolling bread-wound wheel meshing transmission structure is characterized in that when the outer circular surface of the bearing portion of the roller is a cylindrical surface, it is called a cylindrical roller, and the roller on the outer circumferential surface of the roller carrier wheel The mounting hole is a cylindrical hole, the planetary roller is a cylindrical planetary roller, and the center line of the cylindrical roller mounting hole passes through the center of the roller bearing wheel; the cylindrical roller mounting hole is composed of upper and lower parts, and the upper part is a flat bottom with a large diameter Cylindrical hole, cylindrical roller and cylindrical planetary roller; lower diameter cylindrical through hole, located in the center of the hole, communicating with the annular groove, allowing only the central cylindrical roller to pass; cylindrical roller The end of the limit portion is spherical.

The rudder-shaped roller-wheel-curved bread-wound meshing transmission structure has a cage in a roller mounting hole with a cage, and the cage combines the planetary rollers on a fixed circumference; the planetary roller As the child rolls around the roller, the cage rotates with it.

The rudder-shaped roller-wheel arc-wound wheel meshing transmission structure has a length of the arc-shaped portion of the arc bread wheel which can cover at most half of the rudder-shaped roller wheel.

The rudder-shaped roller wheel-arc-roller wheel meshing transmission structure, the roller spacing on the rudder-shaped roller wheel refers to the arc length on the outer circumferential surface of the roller carrier wheel between the centerlines of the two rollers, and the arc The spiral track groove pitch on the bread wheel refers to the arc length on the arc surface of the envelope wheel between the centerlines of the adjacent two-week spiral track grooves; when the arc bread wheel is designed as a single wire track, the arc bread wheel The pitch of the spiral track groove is equal to the pitch of the roller on the rudder roller and is 1/n of the roller pitch, n is a positive integer; when the arc bread wheel is designed with multiple wires, the arc bread wheel The pitch of the spiral track groove is an integral multiple of the roller pitch on the rudder roller.

The utility model relates to a rudder-shaped roller wheel arc bread wheel meshing transmission structure, a roller limit portion limited position groove, a roller limit device adopts a circular limit retaining ring, and a plurality of openings at a lower portion of the limit retaining ring The card slot and the diameter of the snap ring make the card slot and the roller limit slot position after the roller is installed in position, and each card slot corresponds to one roller, and the card slot is inserted into the roller limit slot.

The utility model has the beneficial effects that the rudder roller and the arc bread wheel are meshed by the rotatable roller, and have the advantages of large transmission ratio, stable operation, compact structure, small volume and no noise with respect to the gear set transmission system. Compared with the worm drive, it is equivalent to the sliding friction of the worm and worm gear into the rolling friction of the roller, so the wear during the transmission process is greatly reduced, the transmission efficiency is greatly improved, and therefore the input power required for the same load is required. The power of the equipment is reduced, and the energy consumption is reduced during the operation of the equipment. The number of rollers engaged between the rudder roller and the arc bread wheel is large, and the bearing capacity is enhanced several times, which can be used for heavy machinery; since the rudder roller and the arc bread wheel have multiple rolls at the same time The shaft is meshed and adopts pre-compression technology to eliminate backlash during reciprocating rotation. Therefore, the present invention can be applied to an automatic device for precision transmission; the transmission ratio of the present invention can be as low as 1:1, and can be reversely rotated, thus Worm and worm gear drives have a wider range of applications. In addition, the manufacture of the roller carrier wheel no longer uses hobbing, gear shaping, etc. to machine the teeth, but uses a simple drilling and milling method to process the assembled roller carrier wheel, which is less difficult to manufacture and has low manufacturing cost.

DRAWINGS

Figure 1 is a schematic view of the overall principle of the present invention, and can also be taken as an abstract drawing;

2 is a schematic structural view of a concave arc-turning bread wheel of the present invention, which is a front sectional view of an arc bread roller;

3 is a schematic structural view of a roller carrier wheel when the roller is not mounted according to the present invention, wherein the roller mounting hole is a conical hole;

Figure 4 is a schematic structural view of a tapered roller of the present invention;

Figure 5 is a schematic view showing the structure of a rudder-shaped roller wheel equipped with a tapered roller according to the present invention;

Figure 6 is a side view of Figure 5 of the present invention;

Figure 7 is a cross-sectional view taken along line A-A of Figure 6 of the present invention;

Figure 8 is a schematic view showing the structure of the planetary roller of the present invention;

9 is a schematic structural view of a limit retaining ring of the present invention;

Figure 10 is a schematic view showing the structure of the roller carrier wheel when the roller is not installed in the present invention, wherein the roller mounting hole is a cylindrical hole;

Figure 11 is a schematic structural view of a cylindrical roller of the present invention;

Figure 12 is a schematic view showing the structure of a rudder-shaped roller wheel in which a cylindrical roller is mounted according to the present invention;

Figure 13 is a side view of Figure 12 of the present invention;

Figure 14 is a cross-sectional view taken along line B-B of Figure 13 of the present invention.

among them:

1. Rudder-shaped roller wheel

1-1, roller carrier wheel

1-2, annular groove

1-3, shaft hole

1-4, tapered roller mounting hole

1-5, cylindrical roller mounting hole

2, arc bread wheel

2-1, spiral track groove

3, roller

3-1, tapered roller

3-2, cylindrical roller

3-3, the meshing part

3-4, bearing part

3-5, the limit part

3-6, limit slot

3-7, cylindrical roller spherical tail

4, limit card ring

4-1, card slot

5, planetary roller

5-1, tapered planetary roller

5-2, cylindrical planetary roller

detailed description

Example 1

In the specific implementation, the roller carrier wheel and the arc bread wheel are made of a steel material and heat treated to increase the surface hardness. The roller and the roller are manufactured by bearing technology and material, and the engaging portion of the roller can be made into a flat head. It can also be made into a round head. When the rudder-shaped roller wheel and the arc bread roller of the present invention are used, the bearing capacity requirement of the transmission is first determined, and the size of the roller is determined according to the bearing capacity requirement; then the number of rollers of the rudder roller is designed according to the transmission ratio. The diameter of the roller carrier wheel, the diameter of the arc bread wheel, the center distance of the rudder roller and the arc bread wheel, the length of the arc portion of the arc on the envelope wheel, the pitch of the spiral track groove, etc. . According to the specific bearing capacity requirements, transmission ratio requirements, precision requirements, the rudder-shaped roller wheel arc bread wheel meshing transmission structure can be serialized and standardized to meet the needs of different fields, different equipment and different applications. .

In this embodiment, a tapered roller is taken as an example, and the implementation method of the present invention will be described with reference to the accompanying drawings.

Figure 2 shows the structure of a concave arc-turning bread wheel. The manufacture of the arc bread wheel 2 firstly processes the concave arc surface of the wheel, the diameter of the concave arc is equal to the diameter of the roller carrier wheel 1, and then is milled or driven into a spiral track groove 2-1 by a special machine tool.

As shown in Fig. 3, an annular groove 1-2 concentric with the roller carrier wheel is drilled on the upper plane of the cylindrical roller carrier wheel 1-1, and the shaft hole 1-3 is drilled in the center and the inner hole keyway is milled. The structure of the tapered roller is as shown in Fig. 4. According to the bearing portion of the tapered roller 3-1 and the taper angle and diameter of the tapered planetary roller 5-1, the tapered shape of the roller carrier wheel 1-1 is determined. The specifications of the roller mounting holes 1-4 are such that the tapered through holes are drilled equidistantly on the outer circumferential surface of the roller carrier wheel 1-1; the processed roller carrier wheel is heat-treated to achieve the required hardness of the material. The tapered through hole is then subjected to grinding finishing to accurately determine the tapered roller mounting hole size 1-4 and to improve the surface roughness of the inner surface of the hole.

Figures 5, 6, and 7 show the overall structure of the rudder-shaped roller wheel mounted with the tapered roller 3-1. To make the drawing clear, the limit retaining ring is not shown in the cross-sectional view. Install the tapered planetary roller 5-1 with the roller cage in the tapered roller mounting hole 1-4, and then insert the tapered roller 3-1 at the center; as can be seen from the figure, After the roller is installed in position, the bearing portion 3-4 of the tapered roller 3-1 is closely matched with the tapered planetary roller 5-1 and the tapered roller mounting hole 1-4 to form a bearing structure, and the roller mounting hole is The outer ring of the bearing, the roller is the inner ring of the bearing; the limiting portion 3-5 just reaches the annular groove 1-2, and the engaging portion 3-3 is higher than the outer circumferential surface of the roller carrier wheel 1-1. Since the tapered roller 3-1 and the tapered planetary roller 5-1 are both thin at the upper end and the lower end, the tapered roller mounting holes 1-4 do not fall out from the lower end of the hole due to the pressure. The engaging portion 3-3 of the roller is slightly larger than the diameter of the carrying portion 3-4, and can prevent the roller mounting hole from coming out during the operation of the planetary roller; the limit retaining ring 4 is engaged from the annular groove 1-2, and each of the card slots 4-1 just snaps into the roller limit groove 3-6 to prevent the tapered roller 3-1 from falling out of the roller mounting hole. The image of the roller carrier wheel on which the roller is mounted is called a rudder roller.

As shown in Fig. 1, according to the design requirements of the central moment, the rudder roller 1 and the arc bread wheel 2 are respectively mounted on the carrying device 90 degrees vertically through the bearing, and the center line and the rudder of the arc bread wheel 2 The center line of the roller mounting hole of the roller-shaped roller 1 is on the same plane, and the engaging portion 3-3 of the tapered roller 3-1 is engaged with the spiral track groove 2-1 of the curved bread wheel 2, and the meshing is good. Later, the arc bread wheel 2 forms an envelope with the rudder roller 1 while a plurality of rollers are engaged. When the arc bread wheel 2 rotates, the spiral groove track 2-1 pushes the roller engaging portion 3-3 which is in contact with the track slope surface, and the horizontal direction component of the thrust action pushes the meshing portion 3-3 to drive the roller carrier wheel 1 to rotate. The vertical direction component forces the tapered roller 3-1 to roll along the surface of the spiral track groove; the tapered roller 3-1 rotates in the center of the tapered planetary roller 5-1 while driving the tapered planetary roller 5-1 to roll Rolling in the shaft mounting hole; the plurality of rollers engaged at the same time, the bearing points of the force are all in the plane where the roller center line is located, and the meshing force of the plurality of rollers forms a resultant force in one direction, pushing the rudder roller The wheel 1 rotates about its axis of rotation. Between the arc bread wheel 2 and the roller 3, between the roller 3 and the planetary roller 5, between the planetary roller 5 and the roller carrier wheel 1-1, all of which are rolling contact and rolling friction, as opposed to In the sliding friction of the conventional worm gear, the friction and wear are greatly reduced.

Example 2

In this embodiment, the roller is a cylindrical roller 3-2, the structure of which is shown in FIG. 11, the bearing portion 3-4 of the roller is cylindrical, and correspondingly, the specification of the roller mounting hole is according to the cylindrical roller. The load bearing portion 3-4 of 3-2 is determined by data; unlike the tapered roller mounting holes 1-4, the cylindrical roller mounting holes 1-5 cannot all be through holes, and the center cylindrical roller 3-2 needs to be transparent. The hole extends its limit portion 3-5 into the annular groove 1-2, while the surrounding cylindrical planetary roller 5-2 requires a bottom support to maintain its mounting position. Therefore, when the cylindrical roller 3-2 is used, the roller mounting hole on the roller carrier wheel 1-1 is composed of two parts, the upper part of the hole is a flat bottom column hole, and the diameter is large, and the cylindrical roller 3-2 can be installed. The cylindrical planetary roller 5-2 has a small diameter of the lower portion of the hole, allowing the cylindrical roller 3-2 to pass. A roller carrier wheel having a cylindrical roller mounting hole is shown in FIG.

Rudder-shaped roller wheel with cylindrical roller FIG. 13 is a side view of FIG. 12, and FIG. 14 is a cross-sectional view taken along line B-B of FIG. Mounting the cylindrical planetary roller 5-2 with the roller cage in the cylindrical roller mounting hole 1-5, and then loading the cylindrical roller 3-2 at the center thereof; after the roller is mounted in position, the column The bearing portion 3-4 of the roller 3-2 is closely fitted with the cylindrical planetary roller 5-2 and the cylindrical roller mounting hole 1-5 to form a bearing structure, and the roller mounting hole is an outer ring of the bearing, and the roller It is the inner ring of the bearing. As can be seen from the figure, after the cylindrical roller 3-2 is mounted in position in the cylindrical roller mounting hole 1-5 of the roller carrier wheel 1-1, the cylindrical roller tail end 3-7 is exactly The inner surface of the annular groove 1-2. When the cylindrical roller 3-2 rotates, there is rolling friction with the roller carrier wheel. The limit retaining ring 4 is snapped into the roller retaining groove 3-6 of the cylindrical roller 3-2 of the roller to prevent the cylindrical roller 3-2 from coming off the roller mounting hole.

When the cylindrical roller is used, the other design methods, manufacturing processes and working principles of the rudder roller and the arc roller are exactly the same, and the implementation method is exactly the same as that of the tapered roller in the first embodiment.

Claims

A rudder-shaped roller-wheel-curved bread-wound meshing transmission structure is characterized in that it is composed of a rudder-shaped roller wheel and an arc-shaped roller wheel, and the rudder-shaped roller wheel includes a roller carrier wheel, a roller, and a planet. Roller and roller limiting device; on the transmission meshing circumferential surface of the roller carrier wheel, there are equally spaced roller mounting holes of the same structure, and the center line of the roller mounting hole is in the same cross section of the roller carrier wheel And passing through the center of the roller carrier wheel; a plane of the roller carrier wheel is concentric with the roller carrier wheel, the annular groove depth enables the roller limiting portion to extend therein; the roller includes the meshing portion a bearing portion and a limiting portion, the three portions are rotating bodies formed around the same central axis, the cross section of the engaging portion is larger than the cross section of the bearing portion, and the end portion of the engaging portion may be a flat head or a round head; the roller is mounted in the roller mounting hole After being installed, the bearing part is in the roller mounting hole, and the limiting portion protrudes into the annular groove, and the engaging portion is higher than the outer circumferential surface of the roller carrier wheel to a spiral on the curved bread wheel Track groove meshing; rolling The bearing part is in the roller mounting hole, and the planetary roller is installed around the roller bearing hole; the roller mounting hole, the planetary roller and the roller shaft are closely matched to form a bearing structure, and the roller mounting hole is equivalent to the outer ring of the bearing, and the roller is equivalent In the inner ring of the bearing; the limiting portion of the roller is connected to the roller limiting device in the annular groove, so that the roller can rotate in the center of each planetary roller in the roller mounting hole but cannot be separated from the roller mounting hole The roller carrier wheel with the roller mounted is shaped like a rudder of a ship, which is called a rudder roller; the shape of the arc bread wheel is a rotation of a concave arc around the central axis of the arc bread wheel. Surface, the rotating surface can form an envelope for the rudder-shaped roller wheel, which is called a concave arc-turning bread wheel, referred to as an arc bread wheel; the diameter of the concave arc is equal to the diameter of the roller carrier wheel; The spiral surface of the enveloping wheel has a spiral track groove, and the pitch of the spiral track groove is equal; the normal section of the spiral track groove is identical to the longitudinal section shape of the roller engaging portion, so that the helical track groove and the roller meshing portion can be optimal. Engagement; rudder roller The central axis of the arc bread wheel is staggered at 90 degrees. The central axis of the arc bread wheel is in the same plane as the central axis of each roller of the rudder roller, and the center of the rudder roller and the arc bread wheel The moment causes the roller engaging portion to just engage the helical track groove of the curved bread wheel, and the curved bread wheel forms an envelope with the rudder roller.
The rudder-shaped roller wheel-arc wheel-wound gear meshing transmission structure according to claim 1, wherein when the outer circular surface of the bearing portion of the roller is a conical surface, it is called a tapered roller, and the roller carrier wheel is externally. The roller mounting hole on the circumferential surface is a tapered hole, and the tapered roller mounting hole communicates with the annular groove; correspondingly, the planetary roller is a tapered planetary roller, and the outer circular surface is also a conical surface, and the bearing of the roller The partial, tapered roller mounting hole and the outer conical surface virtual apex of the tapered planetary roller are the center of the roller carrying wheel.
The rudder-shaped roller wheel-arc wheel-wound gear meshing transmission structure according to claim 1, wherein when the outer circular surface of the bearing portion of the roller is a cylindrical surface, it is called a cylindrical roller, and the roller carrier wheel is externally. The roller mounting hole on the circumferential surface is a cylindrical hole, the planetary roller is a cylindrical planetary roller, and the center line of the cylindrical roller mounting hole passes through the center of the roller carrying wheel; the cylindrical roller mounting hole is composed of upper and lower parts. The upper part is a flat-bottomed cylindrical hole with a large diameter, and the cylindrical roller and the cylindrical planetary roller are installed; the lower part is a cylindrical through-hole having a small diameter, which is located at the center of the hole and communicates with the annular groove, allowing only the central cylindrical roller to pass The end of the limit portion of the cylindrical roller is spherical.
The rudder-shaped roller-wheel-curl-wound wheel meshing transmission structure according to claim 1, wherein the planetary roller in the roller mounting hole has a cage, and the cage combines the planetary roller in a fixed On the circumference; when the planetary roller rolls around the roller, the cage rotates.
The rudder-shaped roller wheel-arc wheel-wound meshing transmission structure according to claim 1, wherein the length of the arc-shaped portion of the arc-roller wheel is capable of enveloping at most half of the rudder-shaped roller wheel. .
The rudder-shaped roller wheel arc-wound wheel meshing transmission structure according to claim 1, wherein: when the curved bread wheel is designed as a single wire track, the pitch of the spiral track groove on the arc bread wheel and the rudder The pitch of the roller on the roller is equal to or equal to 1/n of the roller pitch, and n is a positive integer. When the arc bread wheel is designed with multiple wires, the pitch of the spiral track groove on the arc bread wheel is the rudder. An integral multiple of the roller pitch on the roller.
The rudder-shaped roller wheel arc-wound wheel meshing transmission structure according to claim 1, wherein: the roller limit portion has a limited position groove, and the roller limit device adopts a circular limit card ring, and the limit card There are a plurality of open card slots in the lower part of the ring, and the diameter of the snap ring makes the card slot and the roller limit slot position after the roller is installed in position, each card slot corresponds to one roller, and the card slot is inserted into the roller limit slot. .