Coaxial power output shaft gearbox and machine equipped with the coaxial power output shaft gearbox

Abstract

The present invention discloses a coaxial power output shaft gearbox and a machine equipped with the coaxial power output shaft gearbox. It includes a gearbox housing, on which a bearing hole is provided. The outer ring of a tapered roller bearing is arranged in the bearing hole, and a coaxial shaft is arranged in the inner ring of the tapered roller bearing; a cover is provided at a position on the gearbox housing corresponding to the bearing hole, and a fixed ring is arranged on the gearbox housing outside the bearing hole, and the cover is arranged outside the fixed ring; a moving ring is connected by thread in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing; a locking groove hole is arranged on the moving ring; a protrusion for locking the moving ring is provided on the cover corresponding to the locking groove hole, or a locking ring adapted to the locking groove hole is arranged between the fixed ring and the cover for locking the moving ring. The coaxial power output shaft gearbox of the present invention can effectively solve the problem that the axial clearance of the tapered roller bearing is too large or too small due to using a paper gasket to adjust the radial clearance of the tapered roller bearing in the current gearbox.

Description

Technical Field

[0001] The present invention relates to a coaxial power output shaft gearbox and a machine equipped with the coaxial power output shaft gearbox. Background Art

[0002] The existing coaxial power output shaft gearbox includes a gearbox housing provided with bearing holes. The coaxial power output shaft of the gearbox is supported by tapered roller bearings. The outer rings of the tapered roller bearings are installed in the bearing holes of the gearbox housing, the inner rings of the tapered roller bearings are arranged on the coaxial power output shaft, and the tapered rollers of the tapered roller bearings are disposed between the outer rings and the inner rings of the tapered roller bearings. An oil seal is installed in a housing for installing the oil seal, and the housing for installing the oil seal is mounted on the gearbox housing with a bolt assembly. There are gears in the gearbox housing, and a paper gasket is provided between the gearbox housing and the housing for installing the oil seal. The function of the paper gasket is to seal to prevent lubricating oil from leaking between the gearbox housing and the housing for installing the oil seal. Another function is to adjust the axial clearance and radial clearance of the tapered roller bearings. Obviously, the method of adjusting the axial and radial clearances of the tapered roller bearings by increasing or decreasing the number of paper gaskets is unreasonable. If the number of paper gaskets is small, it will cause the housing for installing the oil seal to overly compress the outer ring of the tapered roller bearing, resulting in a large amount of heat generated by the tapered roller bearing during operation and shortening the service life of the tapered roller bearing. If the number of paper gaskets is too large, the axial clearance and radial clearance of the tapered roller bearing will be too large, and even the outer ring of the tapered roller bearing will be disengaged from the tapered rollers, which will also reduce the service life of the tapered roller bearing and cause the coaxial power output shaft to wobble during rotation, shortening the service life of the oil seal.

[0003] Figure 1 is a cross-sectional view of the existing coaxial power output shaft gearbox 1. The material of the gearbox housing 1-1 is q450 (ferritic ductile iron No. 450), and it is made of Figure 1 It can be seen that the gearbox 1 has a power input shaft 1-10. Figure 2 is Figure 1 a cross-sectional view along line A-A, Figure 2 showing a structural form for adjusting the radial clearance and axial clearance of the tapered roller bearing 1-3 in the existing gearbox 1. This structure is to provide a plurality of paper gaskets 1-8 between the gearbox housing 1-1 outside the bearing hole 1-1-1 and the cover 1-9. First, the slightly compressible property of the paper gasket 1-8 is utilized to prevent the lubricating oil in the gearbox 1 from leaking between the gearbox housing 1-1 outside the bearing hole 1-1-1 and the cover 1-9. At the same time, the number of paper gaskets 1-8 is increased or decreased to adjust the clearance between the cover 1-9 and the outer ring 1-3-3 of the tapered roller bearing 1-3. Since the material of the gearbox housing 1-1 is q450 (ferritic ductile iron No. 450) and the material of the shaft is 45# steel.

[0004] Traditional theory holds that: Metals of different materials have different volume changes when heated. The volume change of the shaft made of 45# steel after heating is greater than that of the gearbox housing made of q450 (ductile iron 450) after heating. Therefore, all textbooks on mechanical design in the past have stipulated that: "Considering that the shaft will elongate when heated, generally a compensation gap of 0.2 - 0.40 mm is left between the bearing cover and the end face of the outer ring of the bearing." This theory has a defect in practice. Since the tapered roller bearing belongs to a separable bearing, the outer ring 1 - 3 - 3 of the tapered roller bearing and the tapered rollers 1 - 3 - 2 of the tapered roller bearing 1 - 3 have been out of contact. The tapered roller bearing is not a whole bearing. This will cause the support stiffness of the tapered roller bearing to decrease, the rotation accuracy of the tapered roller bearing to decrease, vibration to occur when the tapered roller bearing works, and a very high temperature to be generated when the tapered roller bearing is working.

[0005] Especially at the through - shaft power output shaft 1 - 5 of the through - shaft power output shaft gearbox 1, such as Figure 3 and Figure 5 shown. If the through - shaft power output shaft 1 - 5 of the gearbox 1 is supported by a tapered roller bearing 1 - 3, and the method of increasing or decreasing the paper gasket 1 - 8 is used to adjust the radial clearance and axial clearance of the tapered roller bearing 1 - 3. Then, when the number of paper gaskets 1 - 8 used is too small, the annular cover 1 - 12 for installing the oil seal will generate an additional off - axis load on the tapered roller bearing 1 - 3. This additional axial load is generated by the N bolts 1 - 7 used to fasten the annular cover 1 - 12 for installing the oil seal. In this case, the through - shaft power output shaft gearbox 1 will generate a very high heat, and this additional off - axis axial load may even cause the tapered roller bearing 1 - 3 to get stuck during operation. When the number of paper gaskets 1 - 8 used is too large, as all textbooks on mechanical design in the past have stipulated that: "Considering that the shaft will elongate when heated, generally a compensation gap of 0.2 - 0.40 mm is left between the bearing cover and the end face of the outer ring of the bearing." Then, the outer ring 1 - 3 - 3 of the tapered roller bearing and the tapered rollers 1 - 3 - 2 and the inner ring 1 - 3 - 1 of the tapered roller bearing have been out of contact. The rotation accuracy of the tapered roller bearing 1 - 3 will be out of the question. The through - shaft power output shaft 1 - 5 will have axial run - out and radial run - out. Moreover, the through - shaft power output shaft 1 - 5 must be externally connected to other equipment for work. The excessive radial run - out of the through - shaft power output shaft 1 - 5 will also generate vibration. Its harm is that it will cause the through - shaft power output shaft 1 - 5 to break. The excessive radial run - out of the through - shaft power output shaft 1 - 5 will also damage the oil seal 1 - 4 installed in the annular cover 1 - 12 for installing the oil seal, resulting in the failure of the oil seal 1 - 4. The lubricating oil in the through - shaft power output shaft gearbox 1 will overflow from the contact part between the oil seal 1 - 4 and the through - shaft power output shaft 1 - 5, causing the through - shaft power output shaft gearbox 1 and the machinery installing the through - shaft power output shaft gearbox 1 to be unable to continue working.

[0006] Figure 4 is a sectional view of the existing coaxial power output shaft gearbox housing 1-1. It consists of Figure 4 It can be seen that the bolt holes 1-1-3 on the existing coaxial power output shaft gearbox housing 1-1 must be blind holes, that is, when drilling and tapping, the gearbox housing 1-1 cannot be drilled through to prevent the lubricating oil in the gearbox from leaking out of the gearbox 1 along the threads where the bolts contact the bolt holes.

[0007] Figure 6 is a sectional view of the main reducer of the rear axle of Dongfeng EQ1090 truck. A tapered roller bearing 1-3 is installed in the bearing hole 2-1 of the main reducer housing 2 (the main reducer housing 2 is a cast steel part). Internal threads are machined in the bearing hole 2-1 of the main reducer housing 2. The annular adjusting nut 2-2 is connected with the internal threads machined in the bearing hole 2-1 with external threads. The annular adjusting nut 2-2 contacts the outer ring 1-3-3 of the tapered roller bearing 1-3. By using the characteristic of stepless feed of the threaded connection, the radial clearance and axial clearance of the tapered roller bearing 1-3 are both zeroed. Then the annular adjusting nut 2-2 is locked with a lock piece 2-3. This is the reason why the main reducer of the truck rear axle is not easily damaged, has high reliability and long service life.

[0008] In addition, the power output shaft of the rear axle of Dongfeng EQ1090 truck is not a coaxial shaft but a half shaft. There is a spline connection between the two half shafts 2-4 and the half shaft gear shaft 2-5, and the fit clearance is a sliding fit. There is a gap between the shaft ends of the two half shafts 2-4. The main reducer housing 2 is a cast steel part, and the half shaft gear 2-5 and the tapered roller bearing 1-3 are also steel parts. Therefore, there is no problem of thermal expansion and contraction between the main reducer housing 2 and the half shaft 2-4 of the rear axle of Dongfeng EQ1090 truck.

[0009] Figure 7It is a cross-sectional view of the two-stage main reducer of the Jiefang CA1091 truck. Tapered roller bearings 1-3 are installed in the bearing holes 2-1 of the main reducer housing 2 (the main reducer housing 2 is a cast steel part). Internal threads are machined in the bearing holes 2-1 of the main reducer housing 2, and external threads are machined on the annular adjusting nut 2-2. The annular adjusting nut 2-2 is connected to the internal threads machined in the bearing holes 2-1 with its external threads. The annular adjusting nut 2-2 contacts the outer ring 1-3-3 of the tapered roller bearing 1-3. By utilizing the characteristic of the thread connection that allows for stepless feed, the radial clearance and axial clearance of the tapered roller bearing 1-3 are both set to zero, and then the annular adjusting nut 2-2 is locked with a lock washer 2-3. Additionally, the power output shaft of the rear axle of the Jiefang CA1091 truck is not a through shaft but two half shafts. There is a spline connection between the two half shafts 2-4 and the differential side gears 2-5, and the fit clearance is a sliding fit. There is a gap between the shaft ends of the two half shafts 2-4. The main reducer housing 2 is a cast steel part, and the differential side gears 2-5 and the tapered roller bearings 1-3 are also made of steel. Therefore, there is no issue of thermal expansion and contraction between the main reducer housing 2 of the rear axle of the Jiefang CA1091 truck and the two half shafts 2-4.

[0010] However, the radial clearance and axial clearance between the outer ring 1-3-3 of the tapered roller bearings 1-3 installed at both ends of the through shaft 4 of the first-stage main reducer of the Jiefang CA1091 truck and the end covers 1-9 are still adjusted by paper gaskets 1-8. Therefore, this is also the reason why the tapered roller bearings 1-3 installed at both ends of the first-stage main reduction shaft 4 of the two-stage main reducer of the CA1091 truck are often damaged.

[0011] Ordinary lathes have three-jaw chucks and four-jaw chucks. Therefore, ordinary lathes can only use three-jaw chucks to clamp workpieces with a circular cross-section and four-jaw chucks to clamp workpieces with a rectangular cross-section. Workpieces with irregular geometric shapes such as the main reducer housing of an automotive rear axle cannot be clamped on ordinary lathes. Naturally, it is also impossible to machine the bearing holes 2-1 on the main reducer housing 2 of the automotive rear axle and the threads inside the bearing holes 2-1 with an ordinary lathe. The only equipment that can machine bearing holes 2-1 on workpieces with irregular geometric shapes such as the main reducer housing 2 of an automotive rear axle and machine threads inside the bearing holes 2-1 is a large-scale precision machining center. The price of large-scale precision machining centers is over 5 million yuan, which is extremely expensive. Moreover, the efficiency of machining internal threads in the bearing holes 2-1 with a large-scale precision machining center is extremely low. Therefore, even for high-value-added industrial products such as automobiles, only threads are machined inside the bearing holes 2-1 of the main reducer housing 2 of the rear axle, and tapered roller bearings 1-3 are used. This is still the case when the main reduction housing 2 is a cast steel part.

[0012] In terms of current industrial technologies, considering processing efficiency and processing costs, even in the transmission gearbox of an automobile, tapered roller bearings are not used, but deep groove ball bearings are installed. As is well known, the load-bearing capacity of a deep groove ball bearing is not as large as that of a tapered roller bearing. Moreover, after the deep groove ball bearing is installed in the bearing hole of the transmission gearbox, there is still a problem that the bearing clearance cannot be ensured to be completely eliminated. In all the final drives of the rear axles of automobiles, internal threads are machined in the bearing holes 2-1 of the final drive housing 2 (the final drive housing 2 is a steel casting), and then an annular adjusting nut 2-2 is used to adjust the radial clearance and axial clearance of the tapered roller bearing 1-3, and the radial clearance and axial clearance of the tapered roller bearing 1-3 are both set to zero.

[0013] Therefore, how to install the tapered roller bearing 1-3 in the through-shaft power output shaft gearbox, make the radial clearance and axial clearance of the tapered roller bearing 1-3 both zero, pre-tighten the tapered roller bearing instead of over-tightening it, and ensure that the tapered roller bearing will not be stuck under the condition of temperature generation during the operation of the through-shaft power output shaft gearbox, so as to improve the support stiffness of the tapered roller bearing for the shaft and its own rotation accuracy, and also reduce the production cost of the through-shaft power output shaft gearbox and improve the production efficiency of the through-shaft power output shaft gearbox has become a difficult problem in the machinery manufacturing industry. Summary of the Invention

[0014] In view of the above problems, the present invention provides a through-shaft power output shaft gearbox that facilitates the adjustment of the axial clearance of a tapered roller bearing.

[0015] To achieve the above object, the through-shaft power output shaft gearbox of the present invention includes a gearbox housing. A bearing hole is provided on the gearbox housing. The outer ring of a tapered roller bearing is provided in the bearing hole, and a through-shaft is provided on the inner ring of the tapered roller bearing; A cover is provided on the gearbox housing at a position corresponding to the bearing hole. A fixed ring is provided on the gearbox housing outside the bearing hole, and the cover is provided outside the fixed ring; A moving ring is threadedly connected in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing;

[0016] A locking slot hole is provided on the moving ring;

[0017] A protrusion for locking the moving ring is provided on the cover corresponding to the locking slot hole, or a locking ring adapted to the locking slot hole is provided between the fixed ring and the cover for locking the moving ring.

[0018] To achieve the above object, a machine equipped with the through-shaft power output shaft gearbox of the present invention includes the above-mentioned through-shaft power output shaft gearbox.

[0019] The coaxial power output shaft gearbox of the present invention can effectively solve the problems that in the current gearbox, the coaxial shaft uses tapered roller bearings for support, and a paper gasket is used between the gearbox housing and the cover with an oil seal installed to adjust the radial clearance and axial clearance of the tapered roller bearings, resulting in too small radial clearance and axial clearance of the tapered roller bearings, causing the tapered roller bearings to bear excessive additional axial loads and reducing the service life of the tapered roller bearings; if the radial clearance and axial clearance of the tapered roller bearings are too large, the outer ring of the tapered roller bearing will be separated from the tapered rollers and the inner ring of the tapered roller bearing, and the coaxial power output shaft will axially move and radially swing.

[0020] To achieve the above object, the coaxial power output shaft gearbox of the present invention includes a gearbox housing, on which a bearing hole is provided, the outer ring of a tapered roller bearing is arranged in the bearing hole, a coaxial power output shaft is arranged in the inner ring of the tapered roller bearing, a gear is arranged on the coaxial power output shaft, a ring-shaped cover is arranged on the gearbox housing corresponding to the position of the coaxial power output shaft, a fixed ring is arranged between the gearbox housing outside the bearing hole and the ring-shaped cover, a moving ring is threadedly connected in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing;

[0021] A locking groove hole is arranged on the moving ring;

[0022] On the ring-shaped cover, a protrusion for locking the moving ring is arranged corresponding to the locking groove hole, or a locking ring adapted to the locking groove hole for locking the moving ring is arranged between the fixed ring and the ring-shaped cover.

[0023] The locking ring is annular, and a plurality of long holes for screw fixation are arranged on the locking ring. One or more protrusions for locking the moving ring are arranged on the inner ring of the locking ring corresponding to the locking groove hole.

[0024] Furthermore, a stop is integrally arranged on the outer circumference of the ring-shaped cover facing the fixed ring, and the inner diameter of the stop is adapted to the outer diameter of the fixed ring.

[0025] To achieve the above object, a machine equipped with the coaxial power output shaft gearbox of the present invention includes the above-mentioned coaxial power output shaft gearbox.

[0026] To achieve the above object, the coaxial power output shaft gearbox of the present invention includes a gearbox housing, on which a bearing hole is provided, the outer ring of a tapered roller bearing is arranged in the bearing hole, a coaxial power output shaft is arranged in the inner ring of the tapered roller bearing, a gear is arranged on the coaxial power output shaft, a ring-shaped cover is arranged on the gearbox housing corresponding to the position of the coaxial power output shaft, a fixed ring is arranged between the gearbox housing outside the bearing hole and the ring-shaped cover, a moving ring is threadedly connected in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing;

[0027] A locking slot hole is provided on the moving ring.

[0028] On the annular cover, a protrusion for locking the moving ring is provided corresponding to the locking slot hole, or a locking ring for locking the moving ring and adapted to the locking slot hole is provided between the stationary ring and the annular cover.

[0029] A double-lip oil seal is provided inside the annular cover. An oil injection through hole is provided between the two lips of the double-lip oil seal. An oil passage and an oil injection port are provided on the cover for installing the oil seal.

[0030] Furthermore, the oil seal is a double-lip oil seal, including an annular metal skeleton and an annular rubber body wrapped on the surface of the annular metal skeleton. The inner wall of the annular rubber body forms a first lip and a second lip along the axial direction. An oil injection through hole is provided at the position of the annular rubber body between the first lip and the second lip, and the oil injection through hole corresponds to the oil injection port.

[0031] To achieve the above object, the coaxial power output shaft gearbox of the present invention includes a gearbox housing. A bearing hole is provided on the gearbox housing. The outer ring of a tapered roller bearing is provided inside the bearing hole. A coaxial shaft is provided inside the inner ring of the tapered roller bearing. A cover is provided on the gearbox housing corresponding to the bearing hole. A stationary ring is provided on the gearbox housing outside the bearing hole. The cover is provided outside the stationary ring. A moving ring is threadedly connected inside the stationary ring, and the moving ring contacts the outer ring of the tapered roller bearing.

[0032] A locking screw hole is radially provided on the side wall of the stationary ring, and a locking screw for locking the moving ring is provided inside the locking screw hole.

[0033] To achieve the above object, the machine equipped with the coaxial power output shaft gearbox of the present invention includes the above-mentioned coaxial power output shaft gearbox.

[0034] The machine equipped with the coaxial power output shaft gearbox of the present invention can effectively solve the problems that the coaxial power output shaft of the gearbox installed on the current machine uses a tapered roller bearing for support, and a paper gasket is used between the gearbox housing and the cover for installing the oil seal to adjust the radial clearance and axial clearance of the tapered roller bearing, resulting in too small radial clearance and axial clearance of the tapered roller bearing, causing the tapered roller bearing to bear additional axial loads and reducing the service life of the tapered roller bearing; too large radial clearance and axial clearance of the tapered roller bearing cause the outer ring of the tapered roller bearing to be disengaged from the tapered roller and the inner ring of the tapered roller bearing, resulting in axial movement and radial swing of the coaxial power output shaft, damaging the double-lip oil seal installed inside the cover for installing the oil seal, causing oil leakage in the gearbox, and the contact part between the lip of the oil seal and the coaxial power output shaft has no oil lubrication and is in a dry friction state, shortening the service life of the oil seal and the service life of the machine equipped with the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a cross-sectional view of the existing coaxial power output shaft gearbox 1.

[0036] Figure 2 is Figure 1 a cross-sectional view of the coaxial power output shaft gearbox 1 in

[0037] Figure 3 is Figure 2 a partially enlarged schematic view of

[0038] Figure 4 is a cross-sectional view of the existing gearbox housing 1-1.

[0039] Figure 5 is a cross-sectional view of the tapered roller bearing 1-3, which has an inner ring 1-3-1 of the tapered roller bearing, tapered rollers 1-3-2, and an outer ring 1-3-3 of the tapered roller bearing. The tapered roller bearing 1-3 belongs to a separable bearing, that is, the outer ring 1-3-3 of the tapered roller bearing can be removed.

[0040] Figure 6 is a cross-sectional view of the main reducer of the rear axle of the Dongfeng EQ1090 type vehicle.

[0041] Figure 7 is a cross-sectional view of the two-stage main reducer of the Jiefang CA1091 type vehicle.

[0042] Figure 8 is a schematic view of the fixed ring 5.

[0043] Figure 9 is Figure 8 a cross-sectional view of the fixed ring 5 in along the B-B line. The fixed ring 5 is provided with countersunk screw holes 5-1.

[0044] Figure 10 is a schematic view of the moving ring 6, and the moving ring 6 has a locking groove hole 6-1.

[0045] Figure 11 is Figure 10 a cross-sectional view of the moving ring in along the C-C line.

[0046] Figure 12 is a view of the locking ring 7. The locking ring 7 has bolt holes 7-1 and locking tongues 7-2.

[0047] Figure 13 is Figure 12 a cross-sectional view of along the D-D line.

[0048] Figure 14 is a schematic view of the annular seal 1-12, and a protrusion 1-12-1 for locking the moving ring can be provided on the annular seal.

[0049] Figure 15 is Figure 14 The left view of the annular cover 1-12 in

[0050] Figure 16 The structural schematic diagram of the embodiment of the present invention.

[0051] Figure 17 is Figure 16 The enlarged view of part A in

[0052] Figure 18 is Figure 16 The enlarged view of part B in

[0053] Figure 19 is Figure 16 The enlarged view of part C in

[0054] Figure 20 is Figure 16 The enlarged view of another embodiment of part B in

[0055] Figure 21 is Figure 18 The sectional schematic diagram of the double-lip oil seal in

[0056] Figure 22 The structural schematic diagram of the present invention applied to a rotary tiller.

[0057] Figure 23 The structural schematic diagram of another embodiment of the present invention. Specific embodiments

[0058] The following combines Figures 7 - 23 to further illustrate the present invention.

[0059] The present invention aims to improve the through-shaft power output shaft gearbox.

[0060] Embodiment 1

[0061] This embodiment provides a through-shaft power output shaft gearbox, including a gearbox housing, on which bearing holes are provided. The outer ring of a tapered roller bearing is arranged in the bearing holes, and a through-shaft is arranged in the inner ring of the tapered roller bearing. Gears are arranged on the through-shaft. Seals 1-9 are arranged on the gearbox housing corresponding to the bearing holes. A fixed ring 5 is arranged on the gearbox housing outside the bearing holes, and a moving ring 6 is connected in the fixed ring by thread. The moving ring contacts the outer ring of the tapered roller bearing, and a locking groove hole 6-1 is arranged on the moving ring; the locking groove hole 6-1 can be arranged on the inner ring of the moving ring or on the side wall of the moving ring facing the seal; the locking groove hole 6-1 can also be arranged on the outer ring of the moving ring.

[0062] On the cover 1-9, there are protrusions for locking the moving ring, or between the stationary ring and the cover, there is a locking ring adapted to the locking slot for locking the moving ring. The number of the locking slots 6-1 can be one or more (in the figure, there are multiple uniformly distributed locking slots), and its shape can be determined according to the protrusions on the cover 1-9 or the protrusions on the locking ring, and can be a groove or a hole.

[0063] Specifically, as Figures 17 - 19 shown, it includes a gearbox housing 1-1. On the gearbox housing 1-1, there is a bearing hole 1-1-1. Inside the bearing hole 1-1-1, there is an outer ring 1-3 of a tapered roller bearing. Inside the inner ring 1-3-1 of the tapered roller bearing, there is a through shaft 1-11. At the position corresponding to the bearing hole 1-1-1 on the gearbox housing 1-1, there is a cover 1-9. On the gearbox housing 1-1 outside the bearing hole 1-1-1, there is a stationary ring 5. The cover 1-9 is arranged outside the stationary ring 5. Inside the stationary ring 5, a moving ring 6 is connected by thread. On the inner ring of the moving ring, there are locking slots 6-1. The number of the locking slots 6-1 can be one or more. The moving ring 6 contacts the outer ring 1-3-3 of the tapered roller bearing 1-3. On the cover 1-9 corresponding to the locking slots 6-1, there are protrusions 1-9-1 for locking the moving ring 6, or between the stationary ring 5 and the cover 1-9, there is a locking ring 7 for locking the moving ring 6. As Figures 12 - 13 shown, the locking ring 7 is annular. On the locking ring, there are multiple long holes for screw fixation. On the inner ring of the locking ring, there is one or more protrusions 7-2. The long holes on the locking ring are beneficial for the locking ring to adjust the protrusions on the locking ring according to the positions of the locking slots on the stationary ring so that they can be inserted into any position inside, thereby fixing the positions of the locking ring and the stationary ring by using the cover or separate fixing screws.

[0064] When installing the coaxial power output shaft gearbox 1, first install the coaxial shaft 1-11 inside the gearbox housing 1-1. There is a gear 1-2 on the coaxial shaft 1-11, and the inner ring 1-3-1 of the tapered roller bearing is set on the coaxial shaft 1-11. The outer ring 1-3-3 of the tapered roller bearing is set in the bearing hole 1-1-1 of the gearbox housing 1-1. Then, a fixed ring 5 is provided on the gearbox housing 1-1 outside the bearing hole 1-1-1. A moving ring 6 is connected by thread in the fixed ring 5. Tighten the moving ring 6, and the moving ring 6 contacts the outer ring 1-3-3 of the tapered roller bearing. The outer ring 1-3-3 of the tapered roller bearing contacts the tapered rollers 1-3-2 of the tapered roller bearing. Continue to tighten the moving rings 6 on both sides of the gearbox housing 1-1, and the moving ring 6 will press the outer ring 1-3-3 of the tapered roller bearing excessively. At this time, rotate the coaxial shaft 1-11, and it will be felt that the power required to rotate the coaxial shaft 1-11 increases significantly. At this moment, the moving ring 6 is pressing the outer ring 1-3-3 of the tapered roller bearing excessively. Then remove the moving ring 6 on one side of the gearbox housing 1-1, so that the outer ring 1-3-3 of the tapered roller bearing loses pressure. Rotate the coaxial shaft 1-11 by 360°, and the tapered rollers 1-3-2 of the tapered roller bearing will push the outer ring 1-3-3 of the tapered roller bearing outwards. Because the diameter of the bearing hole 1-1-1 of the gearbox housing 1-1 is designed and processed to be smaller than the outer ring 1-3-3 of the tapered roller bearing, the tolerance is negative. For example, the diameter of the outer ring 1-3-3 of the tapered roller bearing of model 32312 is 110 mm, then the diameter of the bearing hole 1-1-1 is The bearing hole 1-1-1 has a pre-tightening degree on the outer ring 1-3-3 of the tapered roller bearing. At this time, the gap between the tapered rollers 1-3-2 and the outer ring 1-3-3 of the tapered roller bearing is zero. Manually screw in the moving ring 6 again so that the moving ring 6 contacts the outer ring 1-3-3 of the tapered roller bearing. At this time, the gap between the moving ring 6 and the outer ring 1-3-3 of the tapered roller bearing is also zero.

[0065] This design solution that makes the gap between the outer ring 1-3-3 and the tapered rollers 1-3-2 of the tapered roller bearing in the gearbox 1 zero, and the gap between the outer ring 1-3-3 of the tapered roller bearing and the moving ring 6 zero is contrary to the theory stipulated in all textbooks that "considering that the shaft will elongate when heated, generally a compensation gap of 0.2 - 0.40 mm is left between the bearing cover and the outer end face of the bearing".

[0066] For the coaxial power output shaft gearbox 1 of the present invention, since the clearances between the outer ring 1-3-3 of the tapered roller bearing and the tapered rollers 1-3-2, and between the outer ring 1-3-3 of the tapered roller bearing and the moving ring 6 can be made zero. Therefore, the supporting stiffness of the tapered roller bearing 1-3 for the coaxial shaft 1-11 is increased, the rotational accuracy of the tapered roller bearing 1-3 itself is improved, the coaxial shaft 1-11 only rotates without wobbling, and the gear 1-2 installed on the coaxial shaft 1-11 also only rotates without wobbling. When meshing with the gears installed on other shafts of the coaxial power output shaft gearbox 1, the best meshing state can be achieved. In this way, the temperature inside the coaxial power output shaft gearbox 1 will be significantly reduced, and the service lives of the tapered roller bearing 1-3 and the gear 1-2 will be prolonged.

[0067] Even when the coaxial power output shaft gearbox 1 generates heat during operation, the coaxial shaft 1-11 will expand when heated, and the gearbox housing 1-1 made of q450 (ductile iron 450) will also widen when heated. Suppose when the temperature of the gearbox 1 reaches 90 °C during operation, the width of the gearbox housing 1-1 is 130 mm, and the length of the coaxial shaft 1-11 must also be 130 mm.

[0068] According to the new authoritative experimental results:

[0069] I. When the temperature is between 0 - 100 °C, the linear expansion coefficient of the coaxial shaft 1-11 made of 45# steel is 12×0.000001 / °C

[0070] II. When the temperature is between 0 - 100 °C, the linear expansion coefficient of the gearbox housing 1-1 made of q450 (ferritic ductile iron 450) is 11.2×0.000001 / °C

[0071] III. Then the length of the expansion of the coaxial shaft 1-11: 130 mm × 90 °C × 12×0.000001 / °C

[0072] IV. The width of the expansion of the gearbox housing 1-1: 130 mm × 90 °C × 11.2×0.000001 / °C

[0073] V. Subtracting the width of the expansion of the gearbox housing 1-1 from the length of the expansion of the coaxial shaft 1-11 gives: 130 mm × 90 °C × 12×0.000001 / °C - 130 mm × 90 °C × 11.2×0.000001 / °C = 130 mm × 90 °C × 0.000001 / °C × (12 - 11.2) = 0.00936 mm

[0074] The coaxial 1-11 ratio gearbox housing 1-1 expands by 0.00936 mm more in the length direction at the working temperature of 90°C than the shaft 1-11. Since all objects have elasticity, the gearbox housing 1-1 will exhibit elastic deformation at this time. The fixed ring 5 and the moving ring 6 will also undergo elastic deformation. The tapered roller bearing 1-3 can also bear the pressure of this elastic deformation because the characteristic of the tapered roller bearing is that it can bear both axial force and radial force. The tapered roller bearing 1-3 is immersed in the gear oil, so there is no need to worry about the tapered roller bearing 1-3 being stuck. This calculation data also shows that in the previous textbooks on mechanical manufacturing: "Considering that the shaft will elongate when heated, generally a compensation gap of 0.2 - 0.40 mm is left between the bearing cover and the end face of the outer ring of the bearing", this data has no theoretical basis and is also incorrect.

[0075] For the coaxial power output shaft gearbox 1 of the present invention, the bearing hole 1-1-1 on the gearbox housing 1-1 can be machined using a boring machine (see Figure 3 ). The price of a boring machine is 300,000 yuan. The bolt hole 1-1-3 can be machined on a drilling machine, and the price of a drilling machine is 20,000 yuan. The fixed ring 5 and the moving ring 6 can be machined on an ordinary lathe, and the price of an ordinary lathe is 40,000 yuan. Because machining threads on a circular workpiece is a basic function of an ordinary lathe, not only is the precision high, but the speed is also fast. There is no need to use a machining center with a cost of more than 5 million yuan to machine threads in the bearing hole 1-1-1, which improves the production speed of the gearbox 1 and greatly reduces the production cost of the gearbox 1.

[0076] Embodiment 2

[0077] Combined with Figure 18 and Figure 21 , as a further improvement of Embodiment 1, the oil seal in this embodiment is a double-lip oil seal, including an annular metal skeleton and an annular rubber body 91 wrapped on the surface of the annular metal skeleton. The inner wall of the annular rubber body is axially formed with a first lip and a second lip 93. The cross-section of the first lip and the second lip in the axial direction in the figure is V-shaped; an oil injection through hole 94 is provided at the position of the annular rubber body between the first lip and the second lip, and the oil injection through hole 94 corresponds to the oil injection port 1-12-3 of the annular cover 1-12.

[0078] In this embodiment, a locking spring is provided circumferentially along the first lip at the position of the annular rubber body corresponding to the first lip. A locking spring 931 is also provided circumferentially along the second lip at the position of the annular rubber body corresponding to the second lip.

[0079] Preferably, a groove is provided at the position of the annular rubber body corresponding to the oil injection through hole, and the groove is provided along the circumferential direction of the annular rubber body.

[0080] The double-lip oil seal set in the embodiment can better seal the lubricating oil through the first lip and the second lip formed on the inner wall of the rubber body along the axial direction of the colloid to the left and right sides and the locking springs corresponding to the lips. Through the oil injection through holes provided, the lubricating oil can be injected into the oil seal, reducing the replacement of the oil seal, facilitating operation at the same time, and reducing costs.

[0081] Embodiment 3

[0082] This embodiment provides a through-shaft power output shaft gearbox, including a gearbox housing. A bearing hole is provided on the gearbox housing. The outer ring of a tapered roller bearing is provided in the bearing hole. A through-shaft power output shaft is provided in the inner ring of the tapered roller bearing. A gear is provided on the through-shaft power output shaft. An annular cover 1-12 corresponding to the position of the through-shaft power output shaft is provided on the gearbox housing. A fixed ring 5 is provided on the gearbox housing outside the bearing hole. A moving ring 6 is threadedly connected in the fixed ring. The moving ring contacts the outer ring of the tapered roller bearing. A locking slot hole 6-1 is provided on the moving ring; the locking slot hole 6-1 can be provided on the inner ring of the moving ring or on the side wall of the moving ring facing the cover.

[0083] A protrusion for locking the moving ring is provided on the annular cover 1-12, or a locking ring 7 adapted to the locking slot hole is provided between the fixed ring and the annular cover for locking the moving ring. The number of the locking slot holes 6-1 can be one or more (in the figure, a plurality of locking slots are evenly distributed), and its shape can be determined according to the protrusion on the cover 1-9 or the protrusion on the locking ring, and can be a slot or a hole.

[0084] This embodiment provides a through-shaft power output shaft gearbox, including a gearbox housing 1-1. A bearing hole 1-1-1 is provided on the gearbox housing 1-1. The outer ring 1-3 of a tapered roller bearing is provided in the bearing hole 1-1-1. A through-shaft power output shaft 1-5 is provided in the inner ring 1-3-1 of the tapered roller bearing. A gear is provided on the through-shaft power output shaft 1-5. An annular cover 1-12 for installing an oil seal is provided at the position corresponding to the through-shaft power output shaft 1-5 on the gearbox housing;

[0085] A fixed ring 5 is provided on the gearbox housing 1-1 outside the bearing hole 1-1-1. The annular cover 1-12 is provided outside the fixed ring 5. A moving ring 6 is threadedly connected in the fixed ring 5. A locking slot hole 6-1 is provided on the inner ring of the moving ring. The number of the locking slot holes 6-1 can be one or more; the moving ring 6 contacts the outer ring 1-3-3 of the tapered roller bearing 1-3. A protrusion 1-12-1 for locking the moving ring 6 is provided on the annular cover 1-12 for installing the oil seal corresponding to the locking slot hole 6-1, or a locking ring 7 for locking the moving ring 6 is provided between the fixed ring 5 and the annular cover 1-12 for installing the oil seal. AsFigures 12 - 13 The shown locking ring 7 is annular, and a plurality of long holes for screw fixation are provided on the locking ring. One or more protrusions 7-2 are provided on the inner ring of the locking ring. The use of long holes on the locking ring is beneficial for the locking ring to adjust the protrusions on the locking ring according to the position of the locking slot holes on the fixed ring so that they can be inserted into it at any position, thereby fixing the positions of the locking ring and the fixed ring by using a cover or separate fixing screws.

[0086] An outer circumferential position of the above-mentioned annular cover 1-12 for installing the oil seal is integrally provided with a rabbet 1-12-2 facing the position of the fixed ring. The inner diameter of the rabbet is adapted to the outer diameter of the fixed ring. The rabbet shown in the figure is annular and can also be of other shapes. It is concentric with the lip 9-4 of the oil seal 9 for radially positioning the oil seal 9 so that the lip 9-4 of the oil seal 9 is completely in contact with the outer circle at the position where the oil seal for the through-shaft dynamic output shaft 1-5 is installed, to ensure the sealing effect of the oil seal 9 on the lubricating oil in the gearbox 1.

[0087] Specifically as shown in the figure, it includes a gearbox housing 1-1. A bearing hole 1-1-1 is provided on the gearbox housing 1-1. An outer ring 1-3-3 of a tapered roller bearing is provided in the bearing hole 1-1-1. A through-shaft power output shaft 1-5 is provided in an inner ring 1-3-1 of the tapered roller bearing. A gear is provided on the through-shaft power output shaft 1-5. An annular cover 1-12 for installing the oil seal is provided on the gearbox housing 1-1 at a position corresponding to the through-shaft power output shaft;

[0088] A fixed ring 5 is provided between the gearbox housing 1-1 outside the bearing hole 1-1-1 and the annular cover 1-12 for installing the oil seal. A moving ring 6 is threadedly connected in the fixed ring 5. A locking slot hole 6-1 is provided on the inner ring of the moving ring 6. The number of the locking slot holes 6-1 can be one or more; the moving ring 6 is in contact with the outer ring 1-3-3 of the tapered roller bearing 1-3,

[0089] A protrusion 1-12-1 for locking the moving ring 6 is provided on the annular cover 1-12 for installing the oil seal corresponding to the locking slot hole 6-1, or a locking ring 7 for locking the moving ring 6 is provided between the fixed ring 5 and the annular cover 1-12 for installing the oil seal.

[0090] When installing the coaxial power output shaft gearbox 1, first install the coaxial power output shaft 1-5 inside the gearbox housing 1-1. Set the inner ring 1-3-1 of the tapered roller bearing on the coaxial power output shaft 1-5, and set the outer ring 1-3-3 of the tapered roller bearing in the bearing hole 1-1-1 of the gearbox housing 1-1. Then, a fixed ring 5 is provided on the gearbox housing 1-1 outside the bearing hole 1-1-1. A moving ring 6 is threadedly connected inside the fixed ring 5. Tighten the moving ring 6, and the moving ring 6 contacts the outer ring 1-3-3 of the tapered roller bearing. The outer ring 1-3-3 of the tapered roller bearing contacts the tapered rollers 1-3-2 of the tapered roller bearing. Continue to tighten the moving rings 6 on both sides of the gearbox housing 1-1, and the moving ring 6 will overly compress the outer ring 1-3-3 of the tapered roller bearing. At this time, rotate the coaxial power output shaft 1-5, and it will be felt that the power required to rotate the coaxial power output shaft 1-5 increases significantly. At this moment, the moving ring 6 is overly compressing the outer ring 1-3-3 of the tapered roller bearing. Then, withdraw the moving ring 6 on one side of the gearbox housing 1-1. In this way, the outer ring 1-3-3 of the tapered roller bearing loses pressure. Rotate the coaxial power output shaft 1-5 by 360°, and the tapered rollers 1-3-2 of the tapered roller bearing will push the outer ring 1-3-3 of the tapered roller bearing outwards. Because the diameter of the bearing hole 1-1-1 is designed and processed to be smaller than the outer ring 1-3-3 of the tapered roller bearing, the tolerance is negative. For example, the diameter of the outer ring 1-3-3 of the tapered roller bearing of model 32312 is 110 mm, then the diameter of the bearing hole 1-1-1 is The bearing hole 1-1-1 has a pre-tightening force on the outer ring 1-3-3 of the tapered roller bearing. Due to the existence of this pre-tightening force, the outer ring 1-3-3 of the tapered roller bearing and the tapered rollers 1-3-2 will not separate at this time. At this time, the clearance between the tapered rollers 1-3-2 and the outer ring 1-3-3 of the tapered roller bearing becomes zero. Manually screw in the moving ring 6 again so that the moving ring 6 contacts the outer ring 1-3-3 of the tapered roller bearing. At this time, the clearance between the moving ring 6 and the outer ring 1-3-3 of the tapered roller bearing also becomes zero.

[0091] This design solution that makes the clearance between the outer ring 1-3-3 of the tapered roller bearing and the tapered rollers 1-3-2 in the gearbox 1 become zero, and the clearance between the outer ring 1-3-3 of the tapered roller bearing and the moving ring 6 also becomes zero, is contrary to the theory stipulated in all textbooks that "considering that the shaft will elongate when heated, generally a compensation clearance of 0.2 - 0.40 mm is left between the bearing cover and the outer end face of the bearing".

[0092] For the coaxial power output shaft gearbox 1 of the present invention, since the clearances between the outer ring 1-3-3 of the tapered roller bearing, the tapered roller 1-3-2, and the moving ring 6 can all be made zero, the supporting stiffness of the tapered roller bearing 1-3 for the coaxial power output shaft 1-5 is increased, the rotational accuracy of the tapered roller bearing 1-3 itself is improved, the coaxial power output shaft 1-5 only rotates without wobbling, the gear 1-2 installed on the coaxial power output shaft 1-5 can also only rotate without wobbling, and the gears installed on other shafts of the gearbox 1 can also only rotate without wobbling. In this way, the temperature inside the coaxial power output shaft gearbox 1 will be significantly reduced.

[0093] Even if the coaxial power output shaft gearbox 1 generates temperature during operation, the coaxial power output shaft 1-5 will elongate when heated, and the gearbox housing 1-1 made of q450 (ductile iron 450) will also widen when heated. Suppose when the temperature of the gearbox 1 reaches 90°C during operation, the width of the gearbox is 130 mm, and the length of the coaxial power output shaft 1-5 contained in the gearbox 1 must also be 130 mm.

[0094] According to the experimental results:

[0095] I. At 0-100°C, the linear expansion coefficient of the coaxial shaft 1-11 made of 45# steel is 12×0.000001 / °C

[0096] II. At 0-100°C, the linear expansion coefficient of the gearbox housing 1-1 made of q450 (ferritic ductile iron 450) is 11.2×0.000001 / °C

[0097] III. The length of the part of the coaxial power output shaft 1-5 that expands inside the gearbox 1: 130 mm×90°C×12×0.000001 / °C

[0098] IV. The width of the gearbox housing 1-1 that expands: 130 mm×90°C×11.2×0.000001 / °C

[0099] V. Subtracting the width of the expansion of the gearbox housing 1-1 from the length of the part of the coaxial power output shaft 1-5 that expands inside the gearbox 1 gives: 130 mm×90°C×12×0.000001 / °C - 130 mm×90°C×11.2×0.000001 / °C = 130 mm×90°C×0.000001 / °C×(12 - 11.2) = 0.00936 mm

[0100] This value is very small. As is well known, all objects have elasticity. At this time, the gearbox housing 1-1 will exhibit elastic deformation, and the fixed ring 5, the moving ring 6, the annular cover 1-12 for installing the oil seal, and the bolt 1-7 will also produce elastic deformation. The tapered roller bearing 1-3 can also bear the pressure of this elastic deformation. The tapered roller bearing 1-3 is immersed in the gear shaft oil, so there is no need to worry about the tapered roller bearing 1-3 being stuck.

[0101] Embodiment 4

[0102] This embodiment provides a gearbox for installing a through-shaft power output shaft.

[0103] As shown in the figure, it includes a gearbox housing 1-1. A bearing hole is provided on the gearbox housing 1-1. An outer ring of a tapered roller bearing is provided in the bearing hole. A through-shaft power output shaft is provided in the inner ring of the tapered roller bearing. A gear is provided on the through-shaft power output shaft. An annular cover for installing an oil seal is provided on the gearbox housing corresponding to the position of the through-shaft power output shaft. A fixed ring is provided on the gearbox housing outside the bearing hole. A moving ring is threadedly connected in the fixed ring. The moving ring contacts the outer ring of the tapered roller bearing. A locking slot hole 6-1 is provided on the moving ring. The locking slot hole 6-1 can be provided on the inner ring of the moving ring or on the side wall of the moving ring facing the cover.

[0104] A protrusion for locking the moving ring is provided on the annular cover for installing the oil seal corresponding to the locking slot hole, or a locking ring for locking the moving ring is provided between the fixed ring and the annular cover for installing the oil seal. As Figures 12 - 13 shown, the locking ring 7 is annular. A plurality of long holes for screw fixation are provided on the locking ring. One or more protrusions 7-2 are provided on the inner ring of the locking ring. The use of long holes on the locking ring is beneficial for the locking ring to adjust the position of the protrusion on the locking ring according to the position of the locking slot hole on the fixed ring so that it can be inserted into it at any position, thereby fixing the positions of the locking ring and the fixed ring by using the cover or a separate fixing screw.

[0105] A double-lip oil seal is provided in the annular cover for installing the oil seal. An oil injection through-hole 94 is provided at the position between the two lips of the double-lip oil seal. An oil passage and an oil injection port are correspondingly provided on the annular cover for installing the oil seal.

[0106] The through-shaft power output shaft gearbox 1 of the present invention can not only make the clearance between the outer ring 1-3-3 of the tapered roller bearing installed on the through-shaft power output shaft 1-5 and the moving ring 6 zero. It can also make the clearance between the outer ring 1-3-3 of the tapered roller bearing and the tapered roller 1-3-2 zero. The support stiffness of the tapered roller bearing 1-3 for the through-shaft power output shaft 1-5 is improved, and lubricating grease can be injected at any time through the oil injection port 8 and the oil passage 1-12-3 on the cover 1-12 where the oil seal is installed into the contact part between one lip of the double-lip oil seal 9 and the through-shaft power output shaft 1-5, so that the contact part between one lip of the double-lip oil seal 9 and the through-shaft power output shaft 1-5 is lubricated by the lubricating grease, and the rubber debris and iron filings accumulated at the contact part between one lip of the double-lip oil seal 9 and the through-shaft power output shaft 1-5 can be removed, so that abrasive wear does not occur at the contact part between the double-lip oil seal 9 and the through-shaft power output shaft 1-5, the service life of the double-lip oil seal 9 and the through-shaft power output shaft 1-5 can be extended, and further the service life of the through-shaft power output shaft gearbox can be extended.

[0107] Example 5

[0108] As a variation of Examples 1 to 4, the fixing method between the moving ring and the stationary ring is changed to: as Figure 23 shown, a locking screw hole is radially provided on the side wall of the stationary ring, and a locking screw 77 for locking the moving ring is provided in the locking screw hole. That is, after the position of the moving ring is adjusted, the moving ring is locked by the locking screw on the side wall of the stationary ring.

[0109] The above is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A coaxial power output shaft gearbox, comprising a gearbox housing, wherein a bearing hole is provided on the gearbox housing, an outer ring of a tapered roller bearing is provided in the bearing hole, and a coaxial shaft is provided in an inner ring of the tapered roller bearing; a cover is provided on the gearbox housing at a position corresponding to the bearing hole, Characterized in that, a fixed ring is provided on the gearbox housing outside the bearing hole, and the cover is provided outside the fixed ring; a moving ring is threadedly connected in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing; a locking groove hole is provided on the moving ring; a protrusion for locking the moving ring is provided on the cover corresponding to the locking groove hole, or a locking ring adapted to the locking groove hole is provided between the fixed ring and the cover for locking the moving ring.

2. A machine equipped with a coaxial power output shaft gearbox, Characterized in that, it includes the coaxial power output shaft gearbox according to claim 1.

3. A coaxial power output shaft gearbox, comprising a gearbox housing, a bearing hole is provided on the gearbox housing, an outer ring of a tapered roller bearing is provided in the bearing hole, a coaxial power output shaft is provided in an inner ring of the tapered roller bearing, a gear is provided on the coaxial power output shaft, and an annular cover is provided on the gearbox housing at a position corresponding to the coaxial power output shaft, Characterized in that, a fixed ring is provided between the gearbox housing outside the bearing hole and the annular cover, a moving ring is threadedly connected in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing; a locking groove hole is provided on the moving ring; a protrusion for locking the moving ring is provided on the annular cover corresponding to the locking groove hole, or a locking ring adapted to the locking groove hole is provided between the fixed ring and the annular cover for locking the moving ring.

4. A coaxial power output shaft gearbox according to claim 3, Characterized in that, a stop is integrally provided on an outer circumference of the annular cover facing the fixed ring, and an inner diameter of the stop is adapted to an outer diameter of the fixed ring.

5. A machine equipped with a coaxial power output shaft gearbox, Characterized in that, it includes the coaxial power output shaft gearbox according to claim 3.

6. A coaxial power output shaft gearbox, comprising a gearbox housing, a bearing hole is provided on the gearbox housing, an outer ring of a tapered roller bearing is provided in the bearing hole, a coaxial power output shaft is provided in an inner ring of the tapered roller bearing, a gear is provided on the coaxial power output shaft, and an annular cover is provided on the gearbox housing at a position corresponding to the coaxial power output shaft, Characterized in that, a fixed ring is provided between the gearbox housing outside the bearing hole and the annular cover, a moving ring is threadedly connected in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing; a locking groove hole is provided on the moving ring; a protrusion for locking the moving ring is provided on the annular cover corresponding to the locking groove hole, or a locking ring adapted to the locking groove hole is provided between the fixed ring and the annular cover for locking the moving ring; a double-lip oil seal is provided in the annular cover, a through hole is provided between two lips of the double-lip oil seal, and an oil passage and an oil injection port are provided on the cover for installing the oil seal.

7. The coaxial power output shaft gearbox according to claim 6, Characterized in that, The oil seal is a double-lip oil seal, which includes an annular metal skeleton and an annular rubber body wrapped on the surface of the annular metal skeleton. A first lip and a second lip are axially formed on the inner wall of the annular rubber body; an oil injection through hole is provided at a position between the first lip and the second lip of the annular rubber body, and the oil injection through hole corresponds to the oil injection port.

8. A machine for installing a coaxial power output shaft gearbox Characterized in that It includes the coaxial power output shaft gearbox as described in claim 6.

9. A coaxial power output shaft gearbox includes a gearbox housing. A bearing hole is provided on the gearbox housing. The outer ring of a tapered roller bearing is provided in the bearing hole, and a coaxial shaft is provided in the inner ring of the tapered roller bearing; a cover is provided on the gearbox housing at a position corresponding to the bearing hole. Characterized in that A fixed ring is provided on the gearbox housing outside the bearing hole, and the cover is provided outside the fixed ring; a moving ring is threadedly connected in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing. A locking screw hole is radially provided on the side wall of the fixed ring, and a locking screw for locking the moving ring is provided in the locking screw hole.

10. A machine for installing a coaxial power output shaft gearbox Characterized in that It includes the coaxial power output shaft gearbox as described in claim 9.

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