A gear shaft with high precision and high efficiency positioning

Abstract

The present application discloses a high-precision and efficient positioning gear shaft, comprising a cylindrical main shaft, a first gear, a second gear and a locking and fixing unit, wherein the first gear is fixed to the main shaft, the second gear is passed through by the main shaft and can slide along the main shaft, the inner side of the second gear has a plurality of strip-shaped limiting convex ribs distributed in an annular manner with equal spacing, the main shaft has a plurality of first strip-shaped limiting sliding grooves, a plurality of second strip-shaped limiting sliding grooves and a plurality of third strip-shaped limiting sliding grooves; the locking and fixing unit comprises a first fixing ring and a second fixing ring, the first fixing ring and the second fixing ring are fixedly connected, the first fixing ring abuts the second gear, the second fixing ring has a plurality of strip-shaped grooves, and a locking bolt is installed at the strip-shaped groove to lock the relative position of the second fixing ring and the main shaft. The gear shaft of the present application accurately positions the second gear and can achieve efficient lubrication.

Description

Technical Field

[0001] The present application relates to the field of transmission components, and in particular to a gear shaft with high precision and high efficiency positioning. Background Art

[0002] The gear shaft is a common transmission component in mechanical transmission parts. Its structure mainly consists of a rotating shaft and a gear fixed to the main shaft. Some simple gear shafts have only one gear, and some complex gear shafts may have two gears. Most of the existing gear shafts have fixed relative positions between the gears and the gear shafts, which has a good application form for the already finalized large-scale mass-produced gear shafts. However, in some debugging occasions, or in mechanical transmission systems with different specifications and models, it is hoped that the gear shaft can meet the use of different systems, and the specifications of the gear shaft can be adjusted. In addition, during transmission, it is hoped that the gear shaft has a better lubrication effect, and it is often inconvenient to add lubricating oil to the existing gears after installation, and the lack of lubrication will increase the wear on the gear shaft. Summary of the invention

[0003] Purpose of the invention: This application aims to overcome the defects of the prior art and provide a gear shaft with high precision and high efficiency positioning.

[0004] Technical solution: A gear shaft, comprising a cylindrical main shaft, a first gear, a second gear and a locking and fixing unit, wherein the first gear is fixed to the main shaft, the second gear is passed through by the main shaft and can slide along the main shaft, the inner side of the second gear has a plurality of strip-shaped limiting convex ribs distributed in an annular manner with equal spacing, the main shaft has a plurality of first strip-shaped limiting sliding grooves, a plurality of second strip-shaped limiting sliding grooves and a plurality of third strip-shaped limiting sliding grooves, the number of the strip-shaped limiting convex ribs, the first strip-shaped limiting sliding grooves, the second strip-shaped limiting sliding grooves and the third strip-shaped limiting sliding grooves is equal, and the plurality of first strip-shaped limiting sliding grooves are annular and equal. Spacing distribution, multiple second strip limiting slide grooves are distributed in a circular shape with equal spacing, multiple third strip limiting slide grooves are distributed in a circular shape with equal spacing, the length of the first strip limiting slide groove is greater than the length of the second strip limiting slide groove, and the length of the second strip limiting slide groove is greater than the length of the third strip limiting slide groove; the locking fixing unit includes a first fixing ring and a second fixing ring, the first fixing ring and the second fixing ring are fixedly connected, the first fixing ring abuts against the second gear, and the second fixing ring has a plurality of strip grooves, and the strip grooves are provided with locking bolts for locking the relative position of the second fixing ring and the main shaft.

[0005] Further, it also includes a first fixing unit fixedly connected to the first gear, a second fixing unit fixedly connected to the second gear, and a surrounding unit, the first fixing unit includes a first annular portion and a first annular limiting plate fixedly connected to the first annular portion, the first annular limiting plate has a first annular sealing gasket, the second fixing unit includes a second annular portion and a second annular limiting plate fixedly connected to the second annular portion, and the second annular limiting plate has a second annular sealing gasket; the surrounding unit includes a first barrel portion having a first internal threaded hole and a second barrel portion having a first external thread, the main shaft passes through the first barrel portion and the second barrel portion, the end of the first barrel portion has a first annular end plate abutting against the first annular sealing gasket, and the end of the second barrel portion has a second annular end plate abutting against the second annular sealing gasket; the first annular end plate has a plurality of limiting protrusions distributed in an annular manner with equal spacing, the first annular limiting plate has a plurality of limiting grooves distributed in annular manner with equal spacing, and the number of the limiting protrusions and the number of limiting grooves is equal and the two correspond one to one, the first annular limiting plate is provided with a first oil filling hole, the first annular end plate is provided with a second oil filling hole connected with the first oil filling hole, a plug is installed at the second oil filling hole, and a one-way valve is installed at the plug; the inner side of the first fixing ring is provided with a plurality of first sealing protrusions and a plurality of second sealing protrusions, the number of the first sealing protrusions and the first strip-shaped limiting slide groove is equal, each first sealing protrusion is inserted into one of the first strip-shaped limiting slide grooves, the number of the second sealing protrusions and the second strip-shaped limiting slide grooves is equal, and each second sealing protrusion is inserted into one of the second strip-shaped limiting slide grooves; the diameters of the first annular portion, the first annular limiting plate, the second annular portion and the second annular limiting plate are equal, the diameter of the first annular portion is larger than the diameter of the main shaft by 1-5mm, and the second gear is provided with a plurality of oil outlet channels, the oil outlet channels include a radial channel connected with the inner circumferential wall of the second gear and an axial groove located on the inner circumferential wall of the second gear and connected with the radial channel.

[0006] Furthermore, one end of the axial groove is communicated with the radial channel, and the other end is located on the end surface of the second gear facing the first gear.

[0007] Further, the inner diameter of the second gear is equal to the diameter of the main shaft.

[0008] Furthermore, the plurality of oil outlet channels are distributed in a circular shape with equal intervals.

[0009] Furthermore, the diameter of the first annular portion is 1 mm larger than the diameter of the main shaft.

[0010] Therefore, the lubricating oil in the first and second barrel parts can pass through the second annular part and enter the oil outlet channel.

[0011] Furthermore, it also includes a support unit, which also includes a first support ring and two second support rings, a spring is connected between the first support ring and the second support ring, the first support ring has a first through hole, the second support ring has an annular groove and a plurality of second through holes connected to the annular groove; one of the two second support rings abuts against the first annular end plate of the first barrel, and the other second support ring abuts against the second annular end plate of the second barrel.

[0012] Furthermore, the outer diameter of the first support ring, the outer diameter of the second support ring and the inner diameter of the second cylinder are equal, and the inner diameter of the first support ring, the inner diameter of the second support ring and the diameter of the main shaft are equal.

[0013] Furthermore, the first oil filling hole and the second oil filling hole are both cylindrical holes, and the axes of the two are collinear, the second oil filling hole has a second internal thread, the plug has an insertion tube, an end cap connected to the insertion tube, and a one-way valve installed at the end cap, and the insertion tube has a second external thread that cooperates with the second internal thread.

[0014] Furthermore, both ends of the main shaft have regular hexagonal grooves.

[0015] Therefore, the regular hexagonal groove is convenient for assembly with other mechanical parts, and other assembly structures can certainly be used.

[0016] Furthermore, the first sealing protrusion and the second sealing protrusion are both made of rubber material.

[0017] Furthermore, the first fixing unit also includes a first bolt, the first gear has a first countersunk hole, the first annular portion has a first threaded hole, the first bolt passes through the first countersunk hole and cooperates with the first threaded hole to fix the first gear and the first fixing unit; the second fixing unit also includes a second bolt, the second gear has a second countersunk hole, the second annular portion has a second threaded hole, the second bolt passes through the second countersunk hole and cooperates with the second threaded hole to fix the second gear and the second fixing unit.

[0018] Further, the difference in length between the first strip limiting groove and the second strip limiting groove is equal to the difference in length between the second strip limiting groove and the third strip limiting groove; the gear shaft can be in a first state, a second state and a third state, in the first state, each strip limiting rib is located in a first strip limiting groove; in the second state, each strip limiting rib is located in a second strip limiting groove; in the third state, each strip limiting rib is located in a third strip limiting groove.

[0019] Furthermore, the difference between the length of the first strip-shaped limiting sliding groove and the length of the second strip-shaped limiting sliding groove is equal to the axial length of the second gear.

[0020] Furthermore, the number of the strip-shaped limiting rib, the first strip-shaped limiting groove, the second strip-shaped limiting groove, the third strip-shaped limiting groove, the first sealing protrusion, the second sealing protrusion, the first bolt and the second bolt are all 6.

[0021] Furthermore, the one-way valve is a one-way air-permeable valve.

[0022] Thus, the one-way valve can fill the first and second cylinder parts with air after the lubricating oil is removed from the oil outlet passage.

[0023] Furthermore, the end of the second barrel portion away from the first barrel portion has a plurality of operating grooves distributed in an annular shape with equal intervals.

[0024] The operating groove thus facilitates tightening the second barrel portion with a tool.

[0025] Beneficial effects: The gear shaft of the present application can adjust the installation position of the second gear, and has a plurality of limiting ribs and limiting grooves to cooperate to achieve stable matching transmission.

[0026] After the second gear is installed, accurate positioning and fixing of the second gear can be achieved.

[0027] The gear shaft of the present application can achieve good lubrication and realize stable transmission of the gear shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the gear shaft in the first state;

[0029] Figure 2 is a schematic diagram of the gear shaft in the second state;

[0030] Figure 3 It is a schematic diagram of the gear shaft in the third state;

[0031] Figure 4 A first-person perspective diagram of component separation;

[0032] Figure 5 This is an enlarged view of area A;

[0033] Figure 6 This is an enlarged view of area B;

[0034] Figure 7 This is an enlarged view of area C;

[0035] Figure 8 A second perspective diagram for separating components;

[0036] Fig. 9 This is a schematic diagram of the installation of the gear shaft component;

[0037] Fig.10 A schematic diagram showing the installation of the gear shaft component from another perspective. DETAILED DESCRIPTION

[0038] Figures: 1 first gear; 1.1 first bolt; 1.2 first fixing unit; 1.2.1 first annular portion; 1.2.2 first annular limiting plate; 1.2.3 first threaded hole; 1.2.4 first annular sealing gasket; 1.2.5 limiting groove; 1.2.6 first oil filling hole; 2 second gear; 2.1 second bolt; 2.2 second fixing unit; 2.2.1 second annular portion; 2.2.2 second threaded hole; 2.2.3 second annular limiting plate; 2.2.4 second annular sealing gasket; 2.3 second countersunk hole; 2.4 strip limiting rib; 2.5 radial channel; 2.6 axial groove; 3 main shaft; 3.1 regular hexagonal groove at one end of the main shaft; 3.2 regular hexagonal groove at the other end of the main shaft; 3.3.1 The first strip limiting slide groove; 3.3.2 the second strip limiting slide groove; 3.3.3 the third strip limiting slide groove; 4 locking fixing unit; 4.1 the first fixing ring; 4.2 the second fixing ring; 4.1.1 the first sealing protrusion; 4.1.2 the second sealing protrusion; 4.2.1 the strip groove; 4.2.2 the locking bolt; 5 the first barrel; 5.1 the first annular end plate; 5.2 the limiting protrusion; 5.3 the second oil filling hole; 5.4 the plug; 5.4.1 the end cap; 5.4.2 the insertion tube; 5.4.3 the one-way valve; 6 the second barrel; 6.1 the second annular end plate; 6.2 the operating groove; 7.1 the first supporting ring; 7.2 the second supporting ring; 7.2.1 the annular groove; 7.2.2 the second through hole; 7.3 the spring.

[0039] The following is a specific description with reference to the accompanying drawings. A gear shaft includes a cylindrical main shaft 3, a first gear 1, a second gear 2 and a locking and fixing unit. The first gear is fixed to the main shaft 3, the second gear 2 is passed through the main shaft 3 and can slide along the main shaft 3, the inner side of the second gear 2 has a plurality of strip limiting ribs 2.4 distributed in an annular manner with equal spacing, the main shaft 3 has a plurality of first strip limiting grooves 3.3.1, a plurality of second strip limiting grooves 3.3.2 and a plurality of third strip limiting grooves 3.3.3, the number of the strip limiting ribs 2.4, the first strip limiting grooves 3.3.1, the second strip limiting grooves 3.3.2 and the third strip limiting grooves 3.3.3 are equal, the plurality of first strip limiting grooves 3.3.1 are distributed in an annular manner with equal spacing, and the plurality of The second strip-shaped limit slots 3.3.2 are distributed in a circular shape with equal spacing, and the third strip-shaped limit slots 3.3.3 are distributed in a circular shape with equal spacing. The length of the first strip-shaped limit slot 3.3.1 is greater than the length of the second strip-shaped limit slot 3.3.2, and the length of the second strip-shaped limit slot 3.3.2 is greater than the length of the third strip-shaped limit slot 3.3.3; the locking and fixing unit includes a first fixing ring 4.1 and a second fixing ring 4.2, the first fixing ring 4.1 and the second fixing ring 4.2 are fixedly connected, the first fixing ring 4.1 abuts against the second gear 2, and the second fixing ring 4.2 has a plurality of strip-shaped grooves 4.2.1, and the strip-shaped grooves 4.2.1 are provided with locking bolts 4.2.2 for locking the relative position of the second fixing ring 4.2 and the main shaft 3.In addition, it also includes a first fixing unit fixedly connected to the first gear 1, a second fixing unit fixedly connected to the second gear 2, and an enclosing unit, the first fixing unit includes a first annular portion 1.2.1 and a first annular limiting plate 1.2.2 fixedly connected to the first annular portion 1.2.1, the first annular limiting plate 1.2.2 has a first annular sealing gasket 1.2.4, the second fixing unit includes a second annular portion 2.2.1 and a second annular limiting plate 2.2.3 fixedly connected to the second annular portion 2.2.1, the second annular limiting plate 2.2.3 has a second annular sealing gasket 2.2.4; the enclosing unit includes a first internal threaded hole The first barrel portion 5 and the second barrel portion 6 with a first external thread, the main shaft 3 passes through the first barrel portion 5 and the second barrel portion 6, the end of the first barrel portion 5 has a first annular end plate 5.1 abutting against the first annular sealing gasket 1.2.4, and the end of the second barrel portion 6 has a second annular end plate 6.1 abutting against the second annular sealing gasket 2.2.4; the first annular end plate 5.1 has a plurality of limiting protrusions 5.2 distributed in an annular manner with equal spacing, and the first annular limiting plate 1.2.2 has a plurality of limiting grooves 1.2.5 distributed in an annular manner with equal spacing, the number of the limiting protrusions 5.2 is equal to the number of the limiting grooves 1.2.5 and the two are the same Correspondingly, the first annular limiting plate 1.2.2 has a first oil filling hole 1.2.6, the first annular end plate 5.1 has a second oil filling hole 5.3 connected to the first oil filling hole 1.2.6, the second oil filling hole 5.3 is installed with a plug 5.4, and the plug 5.4 is installed with a one-way valve 5.4.3; the inner side of the first fixing ring 4.1 has a plurality of first sealing protrusions 4.1.1 and a plurality of second sealing protrusions 4.1.2, the number of the first sealing protrusions 4.1.1 and the first strip-shaped limiting sliding groove 3.3.1 is equal, each first sealing protrusion 4.1.1 is inserted into one of the first strip-shaped limiting sliding grooves 3.3.1, and the second sealing protrusions 4.1.1 are inserted into the first strip-shaped limiting sliding grooves 3.3.1, and the second sealing protrusions 4.1.2 are inserted into the first strip-shaped limiting sliding grooves 3.3.1. The number of protrusions 4.1.2 and second strip-shaped limiting grooves 3.3.2 is equal, and each second sealing protrusion 4.1.2 is inserted into one of the second strip-shaped limiting grooves 3.3.2; the diameters of the first annular portion 1.2.1, the first annular limiting plate 1.2.2, the second annular portion 2.2.1 and the second annular limiting plate 2.2.3 are equal, and the diameter of the first annular portion 1.2.1 is 1-5 mm larger than the diameter of the main shaft, and the second gear 2 is provided with a plurality of oil outlet channels, and the oil outlet channels include a radial channel 2.5 connected to the inner circumferential wall of the second gear 2 and an axial groove 2.6 located on the inner circumferential wall of the second gear 2 and connected to the radial channel 2.5.

[0040] In addition, in order to support the surrounding unit, a supporting unit is also included, and the supporting unit also includes a first supporting ring 7.1 and two second supporting rings 7.2. A spring 7.3 is connected between the first supporting ring 7.1 and the second supporting ring 7.2. The first supporting ring 7.1 has a first through hole, and the second supporting ring 7.2 has an annular groove 7.2.1 and a plurality of second through holes 7.2.2 connected to the annular groove 7.2.1; one of the two second supporting rings 7.2 abuts against the first annular end plate of the first barrel 5, and the other second supporting ring 7.2 abuts against the second annular end plate 6.1 of the second barrel 6.

[0041] The first oil injection hole 1.2.6 and the second oil injection hole 5.3 are both cylindrical holes, and the axes of the two are collinear. The second oil injection hole 5.3 has a second internal thread. The plug 5.4 has an insertion tube 5.4.2, an end cap 5.4.1 connected to the insertion tube 5.4.2, and a one-way valve 5.4.3 installed at the end cap 5.4.1. The insertion tube 5.4.2 has a second external thread that matches the second internal thread. Both ends of the main shaft 3 have regular hexagonal grooves. The first sealing protrusion 4.1.1 and the second sealing protrusion 4.1.2 are both made of rubber material. The first fixing unit also includes a first bolt 1.1, the first gear 1 has a first countersunk hole, the first annular portion 1.2.1 has a first threaded hole 1.2.3, the first bolt 1.1 passes through the first countersunk hole and cooperates with the first threaded hole 1.2.3 to fix the first gear and the first fixing unit; the second fixing unit 2.2 also includes a second bolt 2.1, the second gear 2 has a second countersunk hole 2.3, the second annular portion 2.2.1 has a second threaded hole 2.2.2, the second bolt 2.1 passes through the second countersunk hole 2.3 and cooperates with the second threaded hole 2.2.2 to fix the second gear and the second fixing unit. The difference between the lengths of the first strip-limiting groove 3.3.1 and the second strip-limiting groove 3.3.2 is equal to the difference between the lengths of the second strip-limiting groove 3.3.2 and the third strip-limiting groove 3.3.3; the gear shaft can be in a first state, a second state and a third state. In the first state, each strip-limiting rib 2.4 is located in a first strip-limiting groove 3.3.1; in the second state, each strip-limiting rib 2.4 is located in a second strip-limiting groove 3.3.2; in the third state, each strip-limiting rib 2.4 is located in a third strip-limiting groove 3.3.3. The number of the strip-shaped limiting rib 2.4, the first strip-shaped limiting groove 3.3.1, the second strip-shaped limiting groove 3.3.2, the third strip-shaped limiting groove 3.3.3, the first sealing protrusion 4.1.1, the second sealing protrusion 4.1.2, the first bolt 1.1 and the second bolt 2.1 are all six.

[0042] As shown in the figure, the gear shaft of the present application, since the position of the second gear can be adjusted, and the first, second and third strip-shaped limiting grooves are provided for the strip-shaped limiting convex ribs of the second gear, the position of the second gear can be adjusted when in use, so as to adapt to mechanical transmission systems of different structures. And when installing, the fixing unit is locked, so that the end is locked in position, thereby locking the position of the second gear. And the first barrel and the second barrel can be locked with each other. When locking, the position of the first barrel is fixed due to the cooperation of the limiting groove and the limiting convex block (the first oil filling hole should be aligned with the second oil filling hole during installation). As the second barrel is tightened, the first annular end plate abuts the first annular sealing pad, and the second annular end plate abuts the second annular sealing pad, thereby achieving the locking of the position, and objectively also achieving the locking of the position of the second gear. And the first and second support rings of the support unit can support the first and second barrels to avoid deformation caused by the hollow structure of the first and second barrels. And by opening the plug, oil can be injected into the first and second barrels. The first and second support rings have through holes, and the second support ring has an annular groove, so that the first and second support rings will not hinder the flow of lubricating oil. By injecting lubricating oil into the first and second barrels, lubrication is achieved, and as Figure 1-3 As shown, no matter which state the gear shaft is in, the first, second, or third state, the first sealing protrusion at the first fixing ring of the locking fixing unit can be inserted into the first strip-shaped limiting sliding groove to seal the first strip-shaped limiting sliding groove, and the second sealing protrusion can be inserted into the second strip-shaped limiting sliding groove to seal the second strip-shaped limiting sliding groove, so that the lubricating oil will not leak from the first strip-shaped limiting sliding groove and the second strip-shaped limiting groove (specifically, in the first state, as Figure 1 As shown, at this time, the first strip-shaped limit slide groove is inserted by the strip-shaped limit convex rib, the first, second and third strip-shaped limit slide grooves will not leak oil, and the ends of the second and third strip-shaped limit slide grooves cannot be connected to the inside of the first and second barrels; in the second state, as Figure 2 As shown, although the first limiting groove is connected to the internal space of the first and second barrels, the first strip-shaped limiting groove is inserted and sealed by the first sealing protrusion, and the end of the third strip-shaped limiting groove is not connected to the inside of the first and second barrels; in the third state, as Figure 3As shown, the ends of the first and second strip limiting grooves are connected to the internal spaces of the first and second barrel parts, but the first and second strip limiting grooves are sealed by the first and second sealing protrusions, and the third strip limiting groove is blocked by the strip limiting ribs); the reason why only the first and second sealing protrusions are set is that the axial length of the second gear is equal to the difference between the lengths of the first and second limiting grooves. Therefore, when in the first state, the second sealing protrusion just abuts the end of the second strip limiting groove, which will not hinder the movement of the locking and fixing unit along the main axis, and although there is no third sealing protrusion at this time (setting the third sealing protrusion will hinder the locking and fixing unit from sliding along the main axis and unable to move to the position shown in the first state), the end of the third limiting groove is not connected to the interior of the first and second barrel parts, so there is no leakage problem in the third strip limiting groove.

[0043] When in use, the first and second oil filling holes are filled with oil, and the plug is closed, so that when in use, under the condition of low-speed rotation, there is no oil leakage due to the small oil outlet channel. When oil lubrication is needed, under the condition of increasing the gear shaft speed, due to the centrifugal force, the lubricating oil will flow out from the oil outlet channel, and the air pressure inside the first and second channels will decrease, causing air to enter the one-way valve, thereby achieving a balance between the air pressure of the first and second barrels and the atmospheric pressure, thereby avoiding the difficulty of oil outlet caused by negative pressure.

[0044] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A high-precision and efficient positioning gear shaft, characterized in that: The invention comprises a cylindrical main shaft, a first gear, a second gear and a locking and fixing unit, wherein the first gear is fixed to the main shaft, the second gear is passed through by the main shaft and can slide along the main shaft, the inner side of the second gear is provided with a plurality of strip-shaped limiting convex ribs distributed in an annular manner with equal spacing, the main shaft is provided with a plurality of first strip-shaped limiting sliding grooves, a plurality of second strip-shaped limiting sliding grooves and a plurality of third strip-shaped limiting sliding grooves, the number of the strip-shaped limiting convex ribs, the first strip-shaped limiting sliding grooves, the second strip-shaped limiting sliding grooves and the third strip-shaped limiting sliding grooves are equal, the plurality of first strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the plurality of second strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the plurality of third strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the first strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the first strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the second strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the first strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the second strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the third strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the first strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the second ... second strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the second strip-shaped limiting sliding grooves are distributed in an annular manner with equal spacing, the first strip-shaped limiting sliding grooves are distributed in an annular The length of the strip limiting slide groove is greater than the length of the second strip limiting slide groove, and the length of the second strip limiting slide groove is greater than the length of the third strip limiting slide groove; the locking fixing unit includes a first fixing ring and a second fixing ring, the first fixing ring and the second fixing ring are fixedly connected, the first fixing ring abuts the second gear, and the second fixing ring has a plurality of strip grooves, and the strip grooves are provided with locking bolts that lock the relative position of the second fixing ring and the main shaft; the gear shaft also includes a first fixing unit fixedly connected to the first gear, a second fixing unit fixedly connected to the second gear, and a surrounding unit, the first fixing unit includes a first annular portion and a first annular limiting fixedly connected to the first annular portion The second annular stop plate has a first annular sealing gasket, the second fixing unit includes a second annular portion and a second annular stop plate fixedly connected to the second annular portion, and the second annular stop plate has a second annular sealing gasket; the surrounding unit includes a first barrel portion with a first internal threaded hole and a second barrel portion with a first external thread, the main shaft passes through the first barrel portion and the second barrel portion, the end of the first barrel portion has a first annular end plate abutting against the first annular sealing gasket, and the end of the second barrel portion has a second annular end plate abutting against the second annular sealing gasket; the first annular end plate has a plurality of limiting protrusions distributed in an annular manner with equal intervals, and the first annular stop plate has a plurality of limiting protrusions distributed in annular manner with equal intervals. The limiting grooves are distributed in an annular shape with equal intervals, the number of the limiting protrusions is equal to the number of the limiting grooves and the two correspond one to one, the first annular limiting plate is provided with a first oil filling hole, the first annular end plate is provided with a second oil filling hole connected with the first oil filling hole, a plug is installed at the second oil filling hole, and a one-way valve is installed at the plug; the inner side of the first fixing ring is provided with a plurality of first sealing protrusions and a plurality of second sealing protrusions, the number of the first sealing protrusions and the first strip-shaped limiting sliding grooves is equal, each first sealing protrusion is inserted into one of the first strip-shaped limiting sliding grooves, the number of the second sealing protrusions and the second strip-shaped limiting sliding grooves is equal, and each second sealing protrusion is inserted into one of the second strip-shaped limiting sliding grooves;The diameters of the first annular portion, the first annular stop plate, the second annular portion and the second annular stop plate are equal, the diameter of the first annular portion is 1-5 mm larger than the diameter of the main shaft, and the second gear has a plurality of oil outlet channels, the oil outlet channels include radial channels connected to the inner circumferential wall of the second gear and axial grooves located on the inner circumferential wall of the second gear and connected to the radial channels. ; 2. The high-precision and efficient positioning gear shaft according to claim 1, characterized in that: It also includes a support unit, which includes a first support ring and two second support rings, a spring is connected between the first support ring and the second support ring, the first support ring has a first through hole, the second support ring has an annular groove and a plurality of second through holes connected to the annular groove; one of the two second support rings abuts against the first annular end plate of the first barrel, and the other second support ring abuts against the second annular end plate of the second barrel.

3. The high-precision and high-efficiency positioning gear shaft according to claim 1, characterized in that: The first oil filling hole and the second oil filling hole are both cylindrical holes, and the axes of the two are collinear. The second oil filling hole has a second internal thread. The plug has an insertion tube, an end cap connected to the insertion tube, and a one-way valve installed at the end cap. The insertion tube has a second external thread that matches the second internal thread.

4. The high-precision and high-efficiency positioning gear shaft according to claim 1, characterized in that: Both ends of the main shaft are provided with regular hexagonal grooves.

5. The high-precision and high-efficiency positioning gear shaft according to claim 1, characterized in that: The first sealing protrusion and the second sealing protrusion are both made of rubber material.

6. The high-precision and high-efficiency positioning gear shaft according to claim 1, characterized in that: The first fixing unit also includes a first bolt, the first gear has a first countersunk hole, the first annular portion has a first threaded hole, the first bolt passes through the first countersunk hole and cooperates with the first threaded hole to fix the first gear and the first fixing unit together; the second fixing unit also includes a second bolt, the second gear has a second countersunk hole, the second annular portion has a second threaded hole, the second bolt passes through the second countersunk hole and cooperates with the second threaded hole to fix the second gear and the second fixing unit together.

7. The gear shaft with high precision and high efficiency positioning according to claim 1, characterized in that: The difference between the lengths of the first strip limiting groove and the second strip limiting groove is equal to the difference between the lengths of the second strip limiting groove and the third strip limiting groove; the gear shaft can be in a first state, a second state and a third state. In the first state, each strip limiting rib is located in a first strip limiting groove; in the second state, each strip limiting rib is located in a second strip limiting groove; in the third state, each strip limiting rib is located in a third strip limiting groove.

8. The high-precision and high-efficiency positioning gear shaft according to claim 6, characterized in that: The number of the strip-shaped limiting rib, the first strip-shaped limiting sliding groove, the second strip-shaped limiting sliding groove, the third strip-shaped limiting sliding groove, the first sealing protrusion, the second sealing protrusion, the first bolt and the second bolt are all 6.

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