CN113565868B

CN113565868B - Self-lubricating pin gear transmission mechanism

Info

Publication number: CN113565868B
Application number: CN202110861370.4A
Authority: CN
Inventors: 王以南
Original assignee: Zhejiang Cenfit Machinery Co ltd
Current assignee: Zhejiang Cenfit Machinery Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2023-06-02
Anticipated expiration: 2041-07-29
Also published as: CN113565868A

Abstract

The invention relates to the technical field of transmission. The self-lubricating pin gear transmission mechanism comprises a transmission gear arranged on a wheel shaft, wherein the transmission gear is meshed with a pin rack; the wheel shafts on two sides of the transmission gear are provided with self-lubricating bearings, and the self-lubricating bearings comprise an outer ring, an inner ring and a rotor; the inner ring comprises a sleeve sleeved on the wheel shaft and fixedly connected with the wheel shaft, two support grooves with L-shaped cross sections are arranged on the outer surface of the sleeve, and openings of the support grooves are opposite; the outer ring comprises a supporting cylinder sleeved outside the supporting groove of the inner ring, the supporting cylinder is arranged inside the supporting cylinder, and the supporting cylinder is fixedly connected with the supporting cylinder through two ring plates. The self-lubricating device can self-lubricate the rotation of the wheel axle, solve the problem of poor lubrication of the traditional transmission gear wheel axle, ensure the lubrication degree of the wheel axle and the bearing, and prolong the service life of the wheel axle; and the two layers of rotors form sliding, so that the whole sliding property is better.

Description

Self-lubricating pin gear transmission mechanism

Technical Field

The invention relates to the technical field of transmission, in particular to a self-lubricating pin gear transmission mechanism.

Background

Compared with the traditional mode that gears directly use key teeth for meshing, the pin gear transmission device adopts a mode that teeth and pins are meshed for meshing between two transmission parts, and is mainly applied to low-speed and heavy mechanical transmission and occasions with more dust, poor lubrication conditions and the like in severe environments. Compared with the traditional gear transmission device, the gear transmission device has the characteristics of easiness in processing, low manufacturing cost, convenience in disassembly and maintenance and the like, can buffer the wide surface friction between key teeth through the rotation of the pin, and can effectively improve the overall wear resistance of the device. In the form of engagement between its components, it mainly comprises 1, a gear engaged with a pin rack; 2. the gear is internally meshed with the pin gear; 3. the three forms of external engagement of the gear and the pin gear, which have a certain commonality, are mainly explained and illustrated in detail in the first form in the present invention.

Defects of the existing device: 1. because the pin rack and the gear are mainly applicable to large-scale and low-speed transmission, the pin rack has a large volume, and because the detachable pin columns are adopted for transmission, one or more pin columns can be independently replaced when damaged; however, the gear is still integrally machined, and once a certain tooth is damaged, the whole gear needs to be replaced, so that the use cost is greatly increased; 2. the damage friction force between the key teeth of the gear and the pin columns of the pin rack is reduced compared with the traditional transmission device, but the damage friction force still exists, and if the key teeth of the gear can be further improved on the basis, the friction force between the pin columns and the key teeth can be better relieved, and the overall wear resistance is improved. 3. The wheel shaft of the gear is arranged on the bearing seat through the traditional bearing, but because the lubrication condition is severe, the maintenance is needed to be repeated by staff, and the lubrication consumable is supplemented; if the self-lubricating device can realize self-lubricating of the wheel shaft through a simple design, the labor intensity of workers can be greatly reduced, and the overall shutdown risk of equipment is reduced.

Disclosure of Invention

The invention aims to provide a self-lubricating pin gear transmission mechanism capable of prolonging the service life of a bearing.

In order to achieve the aim of the invention, the invention adopts the following technical scheme: the self-lubricating pin gear transmission mechanism comprises a transmission gear which is arranged on a wheel shaft and meshed with a pin rack;

the self-lubricating bearings are arranged on wheel shafts on two sides of the transmission gear, and comprise an outer ring used for being connected with the bearing seat, an inner ring used for being connected with the wheel shafts, and a rotor arranged between the inner ring and the outer ring and used for enabling the inner ring and the outer ring to form running fit;

the inner ring comprises a sleeve sleeved on the wheel shaft and fixedly connected with the wheel shaft, two support grooves with L-shaped cross sections are arranged on the outer surface of the sleeve, and openings of the support grooves are opposite;

the outer ring comprises a supporting cylinder sleeved outside the supporting groove of the inner ring, a supporting cylinder is arranged inside the supporting cylinder, and the supporting cylinder is fixedly connected with the supporting cylinder through two ring plates; two ends of the supporting cylinder are inserted into the supporting groove, a layer of rotor is arranged between the outer surfaces of the two ends of the supporting cylinder and the inner side wall of the supporting groove, and another layer of rotor is arranged between the inner surfaces of the two ends of the supporting cylinder and the outer surface of the sleeve;

a storage chamber is arranged in an annular cavity defined by the bearing cylinder, the supporting cylinder and the two annular plates of the outer ring, the storage chamber is communicated with the inner side wall of the supporting cylinder through a lubrication hole, and a control valve is arranged in the lubrication hole; the outside of storage room still is provided with the feed inlet.

Preferably, the sleeve and the bracket are welded into an integral structure.

Preferably, the receiving cylinder, the supporting cylinder and the annular plate are welded into an integrated structure.

Preferably, the rotor is a cylindrical rotor.

Preferably, two groups of rotors are arranged at two ends of the supporting cylinder at one layer of the rotor positioned outside, and four groups of rotors are uniformly arranged at one layer of the rotor positioned inside along the length direction of the cylinder.

Preferably, the inner surface and the outer surface of the support cylinder, the inner side wall of the support groove and the outer side wall of the sleeve, which are opposite to the rotor, are provided with mounting grooves.

Preferably, the storage chamber is located at the upper part of the self-lubricating bearing.

Preferably, the inner surfaces of the two ends of the receiving cylinder are provided with spiral pump teeth with the pumping direction from the inside of the receiving cylinder towards the two ends.

Preferably, the transmission gear is a combined gear, and comprises a rim, a wheel cover and gear teeth arranged on the rim; the rim is in a circular ring shape, a plurality of tooth holes extending along the radial direction of the rim are uniformly formed in the circumferential surface of the rim, and the tooth holes gradually become smaller from inside to outside; the gear teeth are in a bowling pin shape, the middle sections of the gear teeth are matched with the gear holes, and the gear teeth are arranged in the gear holes in a penetrating manner from inside to outside; the two wheel covers are buckled in two directions from two sides of the rim, and the gear teeth are propped outwards in the gear holes; the two wheel covers are mutually locked through a middle bolt, and the center of the wheel cover is provided with a shaft hole for installing a wheel shaft.

Preferably, the inner ends of the gear teeth face the two sides of the gear cover, opposite to the inner ends of the gear teeth, of the two opposite sides of the gear cover are provided with a plurality of tooth grooves corresponding to the number of the gear teeth, and the groove surfaces of the tooth grooves are inclined surfaces matched with the inclined surfaces of the gear teeth; the inner ends of the gear teeth are clamped in the corresponding tooth grooves of the two wheel covers, and the gear teeth are propped in the tooth holes through lifting the upper slope surface of the wheel cover to the upper slope surface of the gear teeth.

The beneficial effects of the invention are concentrated in that: the self-lubricating device can perform self-lubricating on the rotation of the wheel shaft, solves the problem of poor lubrication of the wheel shaft of the traditional transmission gear, ensures the lubrication degree of the wheel shaft and the bearing, and prolongs the service life of the wheel shaft and the bearing; and the two layers of rotors form sliding, so that the whole sliding property is better. Specifically, in the use process, as the inner rotor and the outer rotor are arranged, the sliding performance between the inner ring and the outer ring can be improved by the two layers of rotors, the lubricating substances in the storage chamber can enter between the support cylinder and the sleeve through the timing opening control valve, lubricate the inner rotor, and then are thrown out between the support cylinder and the side wall of the support groove under the action of centrifugal force, lubricate the outer rotor, have a self-lubricating function, improve the overall working efficiency and reduce the difficulty of maintenance.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the internal structure of a transmission gear;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic view of the structure of the inner surface of the wheel cover;

FIG. 5 is a schematic view of the structure of the outer surface of the wheel cover;

FIG. 6 is a schematic view of the outer surface of the rim;

FIG. 7 is a schematic view of the inner structure of the rim;

FIG. 8 is a schematic view of the structure of FIG. 7 after installation of gear teeth;

FIG. 9 is a schematic view of a gear tooth configuration;

FIG. 10 is a left side view of FIG. 9;

FIG. 11 is a schematic view of the construction of a preferred embodiment of a roller pin;

FIG. 12 is a schematic view of the structure shown in FIG. 2 after the axle has been mounted;

fig. 13 is an enlarged view of a portion B in fig. 12.

Detailed Description

As shown in fig. 1-13, a self-lubricating pin gear transmission mechanism is mainly applied to the transmission of large-size heavy machinery with relatively low requirements on transmission precision, and mainly comprises three parts: 1. a transmission gear; 2. a wheel shaft provided with a transmission gear; 3. a pin tooth member for engaging the drive gear; the pin tooth component, namely the tooth key, is a transmission component formed by a rotary pin, a pin and the like, the most common form of the pin tooth component comprises a pin rack, a pin gear ring and the like, and the pin gear ring can form internal cutting transmission, external cutting transmission and the like with a transmission gear. In the present invention, since the main improvement points are focused on improvement of the mounting manner of the transmission gear 1 and the wheel axle 0, the present invention is mainly described with respect to the combination of the transmission gear 1 and the pin rack 0.

As shown in fig. 1, the present invention includes a transmission gear 1 mounted on an axle 0, the transmission gear 1 being meshed with a pin rack 2. The features of the present invention that distinguish from conventional pin gear transmissions are collectively represented in three general aspects: 1. a combined transmission gear 1 is adopted; 2. adopting rolling pin type gear teeth; 3. a self-lubricating bearing is adopted to bear the installation of the wheel axle 0; the three characteristics can be applied singly or in combination of two or three. The following describes specific structures one by one in combination with the embodiments and the drawings.

As shown in fig. 2, the transmission gear 1 according to the present invention is a combination gear, that is, the transmission gear 1 is not a conventional integrated structure but a combination structure, as its name implies. The drive gear 1 comprises a rim 3, a wheel cover 4 and gear teeth 5 mounted on the rim 3. As shown in fig. 2, 7 and 8, the rim 3 is annular, and a plurality of tooth holes 6 extending along the radial direction of the rim 3 are uniformly formed on the circumferential surface of the rim 3, and the tooth holes 6 gradually decrease from inside to outside. The gear teeth 5 are in a bowling pin shape, and the middle sections of the gear teeth 5 are matched with the tooth holes 6 and are arranged in the tooth holes 6 in a penetrating mode from inside to outside.

The number of teeth 5 shown in the drawings is small, mainly to avoid confusion of the drawings, and in practical application, the number of teeth 5 may be increased or decreased appropriately. As shown in fig. 2, two wheel covers 4 are provided, the outer diameter of the wheel cover 4 is larger than the inner diameter of the wheel rim 3, and the two wheel covers 4 are buckled on two sides of the wheel rim 3 in a bidirectional manner, and the gear teeth 5 are abutted outwards in the gear holes 6. That is, the wheel cover 4 plays a role of pressing the rim 3 after being buckled, and plays a role of pushing the inner end of the gear teeth 5 out, so that the gear teeth 5 are clamped in the gear holes 6, and play is prevented. The two wheel covers 4 are mutually locked through a middle bolt 7, and the center of the wheel cover 4 is provided with a shaft hole 8 for installing the wheel axle 0. Generally, the number of the middle bolts 7 is at least four, and the four middle bolts 7 are uniformly distributed in a ring shape around the shaft hole 8.

The transmission gear 1 mainly comprises a plurality of parts such as a rim 3, gear teeth 5, a wheel cover 4 and the like, wherein the gear teeth 5 are independently arranged on the rim 3, and the fixation is realized through circumferential limit of a gear hole 6 and radial propping of the wheel cover 4. On the one hand, the double positioning mode ensures that the installation stability of the gear teeth 5 is excellent, and is beneficial to uniformly transferring the stress suffered by the gear teeth 5 from the middle to the rim 3 and the root (namely the inner end) to the wheel cover 4, so that the stress concentration is avoided, and the service life of the gear teeth 5 is greatly prolonged. The gear teeth 5 can be independently replaced without integrally replacing the transmission gear 1.

In order to enable the wheel cover 4 to have an outer jacking function on the inner ends of the gear teeth 5, more specific structures can be adopted, for example, oblique pins can be arranged on the wheel cover 4, and the outer jacking can be realized by adjusting the extending length of the pins, but the mode requires a large number of pins, and is inconvenient to adjust. For this purpose, in order to achieve synchronous external tightening of the gear teeth 5, it may be better to use, as shown in fig. 3 and 4, two sides of the inner ends of the gear teeth 5 facing the wheel covers 4 as slopes, and positions opposite to the inner ends of the gear teeth 5 on opposite sides of the two wheel covers 4, that is, at the middle ring part of the wheel cover 4, a plurality of tooth grooves 9 are provided corresponding to the number of the gear teeth 5, and the groove surfaces of the tooth grooves 9 are slopes matched with the slopes on the gear teeth 5. The inner ends of the gear teeth 5 are clamped in corresponding tooth grooves 9 of the two wheel covers 4, and the gear teeth 5 are abutted in the tooth holes 6 through lifting the upper slope surface of the wheel cover 4 to the upper slope surface of the gear teeth 5. When the novel wheel cover is used, the wheel teeth 5 are firstly arranged on the wheel rim 3, then the two wheel covers 4 are buckled, each tooth groove 9 is correspondingly clamped at the lower end of the wheel teeth 5, and the wheel covers 4 tightly clamp and push out the wheel teeth 5 along with the fastening of the middle bolt 7.

On this basis, in order to further improve the bonding strength of the wheel cover 4 and the rim 3 and prevent the relative rotation of the wheel cover 4 and the rim 3, as shown in fig. 4 and 6, a circle of first limiting teeth 10 is annularly arranged at the position, close to the edge, of the surface, opposite to the rim 3, of the wheel cover 4, a circle of second limiting teeth 11 is arranged at the position, opposite to the first limiting teeth 10, of the rim 3, and the first limiting teeth 10 are meshed with the second limiting teeth 11. By utilizing the engagement of the first limiting teeth 10 and the second limiting teeth 11, the wheel cover 4 and the wheel rim 3 can form circumferential limiting, rotation of the wheel cover 4 and the wheel rim can be effectively prevented after locking, and the shearing force received by the middle bolt 7 is effectively reduced. In addition, in order to prevent the two from moving in the radial direction, the middle part of the opposite surface of the wheel cover 4 and the wheel rim 3 is provided with an annular first limiting shoulder 12, the middle part of the wheel rim 3 is provided with a second limiting shoulder 13 matched with the first limiting shoulder 12, and the first limiting shoulder 12 and the second limiting shoulder 13 are mutually buckled.

Of course, in some cases where the torque demand is extremely high, the structure of the transmission gear 1 of the present invention may be further improved, for example: the positions of the wheel cover 4 close to the edges are locked by side bolts 14, and the side bolts 14 penetrate through the wheel cover 4, the wheel rim 3 and the gear teeth 5. The locking degree of the wheel cover 4 is further improved through the plurality of side bolts 14, the stress of the middle section of the middle bolt 7 is shared between the first limiting tooth 10 and the second limiting tooth 11, and the overall structural strength is improved.

Regarding the connection between the transmission gear 1 and the axle 0, it may take various forms such as key connection, bolt connection, flange connection, etc., and here, as shown in fig. 3-5, the axle hole 8 of the wheel cover 4 is provided with a protruding axle key 15, where the axle key 15 extends along the length direction of the axle hole 8 and is matched with an axle key 15 groove on the axle 0. Two or more shaft keys 15 are symmetrically arranged in the shaft hole 8.

In order to further alleviate the friction between the gear teeth 5 and the pin rack 2, the present invention improves the gear teeth 5 in the second major direction in a specific manner, as shown in fig. 9-11, the outer ends of the gear teeth 5 of the transmission gear 1 are provided with vertical grooves 16, edges of the grooves 16 are fixedly provided with a plurality of center rods 17 connecting front and rear sidewalls of the grooves 16, two ends of the center rods 17 are welded with the sidewalls of the grooves 16, or two ends of the center rods 17 are fixedly arranged on the sidewalls of the grooves 16 through end caps, or other connection structures which are convenient to process and install and meet the strength are also adopted. The central rod 17 is provided with a rolling pin 18. The center of the rolling pin 18 is provided with a rod hole matched with the center rod 17, and the rolling pin 18 is sleeved outside the center rod 17 through the rod hole and forms a rotating fit with the center rod 17. During rotation of the rolling pin 18, both ends of the rolling pin 18 may be arranged in a hemispherical shape as shown in fig. 11 in order to reduce friction between the ends of the rolling pin 18 and the side walls of the groove 16.

The outer ends of the gear teeth 5 of the transmission gear 1 are provided with rolling pins 18, and when the transmission is carried out, the rolling pins 18 can form autorotation along with the transmission requirement by taking the peripheral surfaces of the rolling pins 18 as contact surfaces contacted with the pin racks 2, so that a part of friction force is converted into rotation. Compared with the traditional mode that the edge line of the gear teeth 5 is used as a contact surface, the integral stress condition is improved, and the device is particularly suitable for low-speed heavy machinery with low transmission precision requirements and large integral volume. On this basis, in order to strengthen the recess 16 and reduce the risk of deformation thereof, the upper and lower side walls of the recess 16 are connected by a set of stiffening elements. The simplest reinforcing assembly is the reinforcing link 19, which, as shown in fig. 9 and 10, comprises three reinforcing links 19, the three reinforcing links 19 being arranged in a delta shape and having both ends fixedly connected to both side walls of the groove 16, respectively. Further, the three reinforcing connecting rods 19 of the reinforcing assembly are sleeved with triangular reinforcing rings 20, and the reinforcing rings 20 are welded with the reinforcing connecting rods 19. The three reinforcing connecting rods 19 are better in integrity through the reinforcing rings 20, so that stress transmission and dispersion are facilitated.

As for the third great improvement of the present invention, namely, the mounting manner of the axle 0 on the bearing, as shown in fig. 12 and 13, self-lubricating bearings are provided on the axle 0 on both sides of the transmission gear 1, the self-lubricating bearings including an outer ring for connection with the bearing housing, an inner ring for connection with the axle 0, and a rotor 21 provided between the inner ring and the outer ring for making the inner ring and the outer ring form a rotational fit. A two-layer rotor 21 is arranged between the outer ring and the inner ring.

As shown in fig. 13, the inner ring includes a sleeve 22 sleeved on the axle 0 and fixedly connected with the axle 0, and the sleeve 22 is generally fixedly connected with the axle 0 directly through a bolt, or can be sleeved in a key connection and interference fit manner. The outer surface of the sleeve 22 is provided with two brackets 23 with an L-shaped cross section, wherein the L-shaped cross section of the bracket 23 is an L-shape, which is essentially a ring shape, and the openings of the two brackets 23 are opposite. The sleeve 22 and bracket 23 may be welded as a unitary structure or forged directly into this unitary shape.

As further shown in fig. 13, the outer ring includes a receiving cylinder 24 sleeved outside the bracket 23 of the inner ring, a supporting cylinder 25 is disposed inside the receiving cylinder 24, and the supporting cylinder 25 and the receiving cylinder 24 are fixedly connected through two ring plates 26. Two ends of the supporting cylinder 25 are inserted into the supporting groove 23, one layer of rotor 21 is arranged between the outer surfaces of the two ends of the supporting cylinder 25 and the inner side wall of the supporting groove 23, and the other layer of rotor 21 is arranged between the inner surfaces of the two ends of the supporting cylinder 25 and the outer surface of the sleeve 22. The receiving cylinder 24, the supporting cylinder 25 and the ring plate 26 are welded into an integral structure, and may be forged into the integral shape. The rotor 21 of the present invention may be a cylindrical rotor 21, a spherical rotor, etc., and here, taking the cylindrical rotor 21 as an example, two sets of the outer layer of the rotor 21 are disposed at two ends of the supporting cylinder 25, and four sets of the inner layer of the rotor 21 are uniformly disposed along the length direction of the cylinder. In order to facilitate the positioning and rotation of the rotor 21, the inner and outer surfaces of the supporting cylinder 25, the inner side wall of the supporting groove 23 and the outer side wall of the sleeve 22 which are opposite to the rotor 21 are provided with mounting grooves. Due to the arrangement of the inner rotor 21 and the outer rotor 21, the sliding performance between the inner ring and the outer ring can be improved by the two rotors 21.

In order to form automatic lubrication, a storage chamber is arranged in an annular cavity enclosed by the bearing barrel 24, the supporting barrel 25 and the two ring plates 26 of the outer ring, and the storage chamber is generally positioned at the upper part of the self-lubricating bearing. The material storage chamber is communicated with the inner side wall of the supporting cylinder 25 through a lubrication hole 27, a control valve is arranged in the lubrication hole 27, and a material supplementing opening 28 is further arranged on the outer side of the material storage chamber.

In the use process, by opening the control valve at regular time, the lubricating substance in the storage chamber can enter between the support cylinder 25 and the sleeve 22 from the lubricating hole 27 to lubricate the rotor 21 inside, and then is thrown out between the support cylinder 25 and the side wall of the support groove 23 under the action of centrifugal force to lubricate the rotor outside, so that the self-lubricating device has a self-lubricating function, can improve the overall working efficiency and reduce the difficulty of maintenance. In addition, in order to further improve the fluidity of the lubricating material, the lubricating effect is improved. The inner surfaces of the two ends of the receiving barrel 24 are provided with screw pump teeth 29 with the pumping direction from the inside of the receiving barrel 24 to the two ends. When the lubricating device is used, with the rotation of the inner ring, the outer side wall of the bracket 23 generates a pump suction force between the screw pump teeth 29 and the inner surface of the bearing barrel 24, so that lubricating materials are pumped to a certain degree, the lubricating materials move more actively, and the lubricating dead angles of the lubricating materials are reduced. Meanwhile, the storage chamber is filled with the lubricating oil, and the lubricating oil has higher specific heat capacity, so that the cooling effect on the whole self-lubricating bearing can be achieved, the phenomenon that the self-lubricating bearing is too high in temperature is avoided, and the deformation risk is reduced.

Claims

1. The self-lubricating pin gear transmission mechanism comprises a transmission gear (1) arranged on a wheel shaft (0), wherein the transmission gear (1) is meshed with a pin rack (2);

the method is characterized in that: the self-lubricating bearings are arranged on the wheel shafts (0) on two sides of the transmission gear (1), and each self-lubricating bearing comprises an outer ring used for being connected with a bearing seat, an inner ring used for being connected with the wheel shaft (0), and a rotor (21) arranged between the inner ring and the outer ring and used for enabling the inner ring and the outer ring to form running fit;

the inner ring comprises a sleeve (22) sleeved on the wheel shaft (0) and fixedly connected with the wheel shaft (0), two support grooves (23) with L-shaped cross sections are formed in the outer surface of the sleeve (22), and openings of the support grooves (23) are opposite;

the outer ring comprises a supporting cylinder (24) sleeved outside a supporting groove (23) of the inner ring, a supporting cylinder (25) is arranged inside the supporting cylinder (24), and the supporting cylinder (25) is fixedly connected with the supporting cylinder (24) through two annular plates (26); two ends of the supporting cylinder (25) are inserted into the supporting groove (23), a layer of rotor (21) is arranged between the outer surfaces of the two ends of the supporting cylinder (25) and the inner side wall of the supporting groove (23), and another layer of rotor (21) is arranged between the inner surfaces of the two ends of the supporting cylinder (25) and the outer surface of the sleeve (22);

a storage chamber is arranged in an annular cavity formed by the bearing cylinder (24) of the outer ring, the supporting cylinder (25) and the two annular plates (26), the storage chamber is communicated with the inner side wall of the supporting cylinder (25) through a lubrication hole (27), and a control valve is arranged in the lubrication hole (27); and a feed supplementing opening (28) is further formed in the outer side of the storage chamber.

2. The self-lubricating pin gear train of claim 1, wherein: the sleeve (22) and the bracket (23) are welded into an integral structure.

3. The self-lubricating pin gear train of claim 2, wherein: the bearing cylinder (24), the supporting cylinder (25) and the annular plate (26) are welded into an integrated structure.

4. A self-lubricating pin gear train as claimed in claim 3 wherein: the rotor (21) is a cylindrical rotor.

5. The self-lubricating pin gear train of claim 4, wherein: two groups of rotors (21) are arranged at two ends of the supporting cylinder (25) at one layer of the rotors (21) at the outer part, and four groups of rotors (21) at the inner part are uniformly arranged along the length direction of the cylinder.

6. The self-lubricating pin gear train of claim 5, wherein: the inner surface and the outer surface of the supporting cylinder (25) opposite to the rotor (21), the inner side wall of the supporting groove (23) and the outer side wall of the sleeve (22) are respectively provided with a mounting groove.

7. The self-lubricating pin gear train of claim 6, wherein: the storage chamber is positioned at the upper part of the self-lubricating bearing.

8. The self-lubricating pin gear train of claim 7, wherein: the inner surfaces of the two ends of the bearing barrel (24) are provided with spiral pump teeth (29) with the pumping direction from the inside of the bearing barrel (24) towards the two ends.

9. The self-lubricating pin gear train of claim 8, wherein: the transmission gear (1) is a combined gear, and the transmission gear (1) comprises a rim (3), a wheel cover (4) and gear teeth (5) arranged on the rim (3); the rim (3) is in a circular ring shape, a plurality of tooth holes (6) extending along the radial direction of the rim (3) are uniformly formed in the peripheral surface of the rim (3), and the tooth holes (6) gradually become smaller from inside to outside; the gear teeth (5) are in a bowling pin shape, and the middle sections of the gear teeth (5) are matched with the gear holes (6) and are penetrated in the gear holes (6) from inside to outside; the two wheel covers (4) are arranged, the outer diameter of each wheel cover (4) is larger than the inner diameter of the corresponding wheel rim (3), the two wheel covers (4) are buckled on two sides of the corresponding wheel rim (3) in a bidirectional manner, and gear teeth (5) are abutted outwards in the gear holes (6); the two wheel covers (4) are mutually locked through a middle bolt (7), and the center of the wheel cover (4) is provided with a shaft hole (8) for installing the wheel shaft (0).

10. The self-lubricating pin gear train of claim 9, wherein: the inner ends of the gear teeth (5) face the two sides of the gear cover (4) to form sloping surfaces, the opposite sides of the two gear covers (4) are opposite to the inner ends of the gear teeth (5), a plurality of tooth grooves (9) are arranged corresponding to the number of the gear teeth (5), and the groove surfaces of the tooth grooves (9) are sloping surfaces matched with the sloping surfaces of the gear teeth (5); the inner ends of the gear teeth (5) are clamped in corresponding tooth grooves (9) of the two wheel covers (4), and the gear teeth (5) are abutted in the tooth holes (6) through lifting the upper slope surface of the wheel covers (4) to the upper slope surface of the gear teeth (5).