A dehulling assembly and method of manufacturing the same

Abstract

The present application relates to the technical field of vehicle transmission mechanism, and proposes a reduction shell assembly and a manufacturing method thereof, which comprises a shell and two lug seats, the shell is internally provided with a main shaft hole for installing a driving shaft, the lug seats are fixedly arranged on the shell, the lug seats are internally provided with half shaft holes, the two half shaft holes are coaxially arranged and respectively used for installing two half driven shafts, the distance between the lug seats and the yoz plane gradually decreases or increases along the z axis direction, the two lug seats are centrally symmetric about the center line of the shell, and the distance between the two lug seats gradually decreases along the direction away from the shell. The present application limits the arrangement position of the two lug seats on the shell, which not only can improve the anti-tilting ability of the lug seat and improve the safety of the vehicle, but also can guide the differential oil in the shell by the lug seat, so that the differential fully lubricates the transmission components and prolongs the service life of the transmission components.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle transmission mechanism, in particular to a reduction shell assembly and a manufacturing method thereof. BACKGROUND

[0002] The reduction shell assembly provides a closed space for differential, reducer and other components, which not only prevents dust, water and other impurities from entering, but also supports and fixes the components to ensure the stable operation of the vehicle.

[0003] A series of transmission components for reducing speed and increasing torque are integrated inside the reduction shell assembly, such as the driving shaft, the main shaft gear, the half axle shaft and the half shaft gear, etc. In order to improve the running stability of the transmission components, corresponding mounting mechanisms need to be set in the reduction shell assembly. For example, the invention disclosed in the patent with the publication number CN113007318B sets two mounting seats on the shell, which are used to install the output shaft bearing. After the half axle shaft is installed in the output shaft bearing, the coaxiality of the two half axle shafts can be guaranteed.

[0004] The driving shaft and one of the half axle shafts are usually connected by two bevel gears. When the automobile bridge is subjected to extrusion or impact, the half axle shaft will bend, causing the mounting seat to tilt outward. This not only damages the structure and shape of the reduction shell and the bridge shell, but also causes the two bevel gears between the driving shaft and the half axle shaft to separate, resulting in failure of the transmission components, which is not conducive to improving the safety of the vehicle. SUMMARY

[0005] Therefore, the present application provides a reduction shell assembly and a manufacturing method thereof. By adjusting the angle of the ear seat and the shell, the anti-tilting ability of the ear seat can be improved, and the safety of the vehicle can be improved.

[0006] The technical solution of the present application is as follows: On the one hand, the present application provides a reduction shell assembly, which includes a shell and two ear seats. The shell is provided with a main shaft hole for installing a driving shaft. The ear seats are fixedly arranged on the shell, and the ear seats are provided with half shaft holes. The two half shaft holes are coaxially arranged and are used to install two half axle shafts. A three-dimensional rectangular coordinate system is established with the intersection of the half shaft hole axis and the main shaft hole axis as the origin O, the half shaft hole axis as the x-axis, the main shaft hole axis as the y-axis, and the straight line perpendicular to the x-axis and y-axis and passing through the origin O as the z-axis. The distance between the ear seat and the yoz plane gradually decreases or increases along the z-axis direction. The two ear seats are symmetrically arranged about the center line of the shell, and the distance between the two ear seats gradually decreases in the direction away from the shell.

[0007] On the basis of the above technical scheme, preferably, the ear seat comprises a support, a top frame and a fixing bolt, the support is fixedly arranged on the shell, a threaded hole is formed in the inside of the support, the top frame is abuttingly arranged on the support and forms the half shaft hole together with the support, an installation hole is formed in the inside of the top frame, the fixing bolt is connected in the threaded hole through thread cooperation, penetrates the installation hole and abuts against the top frame.

[0008] On the basis of the above technical scheme, preferably, an oil plug is further arranged, an oil hole is formed in the shell, the oil plug is detachably fixed on the shell and blocks the oil hole, a through hole is formed in the inside of the fixing bolt, the through hole is communicated with the oil hole.

[0009] On the basis of the above technical scheme, preferably, the oil plug comprises a blocking bolt, a blocking ball and a spring, the blocking bolt is connected in the oil hole through thread cooperation, the blocking ball is slidingly arranged in the oil hole and blocks the threaded hole, the spring is arranged between the blocking ball and the blocking bolt, a flushing hole is formed in the side of the support close to the main shaft hole, the flushing hole is located on one side of the blocking ball, the outer side of the front end of the fixing bolt is provided with a chamfer and has magnetism.

[0010] On the basis of the above technical scheme, preferably, the oil hole penetrates into the inside of the support and is coaxially arranged with the threaded hole, the inner diameter of the oil hole is larger than the inner diameter of the threaded hole, the outer diameter of the blocking ball is larger than the inner diameter of the threaded hole and smaller than the inner diameter of the oil hole, the number of turns of the spring close to the flushing hole is larger than the number of turns of the spring away from the flushing hole.

[0011] On the basis of the above technical scheme, preferably, the distance between the side of the ear seat away from the main shaft hole and the outer edge of the shell gradually decreases along the circumference of the shell.

[0012] On the basis of the above technical scheme, preferably, the side of the ear seat close to the main shaft hole comprises a middle plane and two end arc surfaces, the middle plane is located at the middle position of the ear seat, the two end arc surfaces are respectively located at the two ends of the middle plane and are continuously arranged with the middle plane, and the end of the end arc surface away from the middle plane is located on the side of the middle plane close to the main shaft hole.

[0013] On the basis of the above technical scheme, preferably, a gear cavity is arranged in the inside of the shell, and one end of one of the end arc surfaces is tangent to the inner wall of the gear cavity.

[0014] On the basis of the above technical scheme, preferably, a flange plate is further arranged, the flange plate is fixedly arranged on the shell.

[0015] In a second aspect, the application provides a manufacturing method of the shell-reducing assembly, comprising the following steps: S1, integrally casting the shell and the two supports, polishing the side of the support away from the shell, and processing the oil hole, the threaded hole and the flushing hole; S2, casting the two top frames, polishing the side of the top frame for abutting against the support, and processing the mounting hole; S3, fixing the top frame on the support by using the long bolt matched with the threaded hole and the mounting hole, and the front end of the long bolt is located on the side of the flushing hole close to the shell; S4, screwing the positioning bolt into the flushing hole, and making the front end of the positioning bolt abut against the side of the long bolt; and S5, reprocessing the two half shaft holes, and detecting the coaxiality of the two half shaft holes.

[0016] The shell-reducing assembly and the manufacturing method thereof have the following beneficial effects compared with the prior art:

[0017] (1) By limiting the layout position of the two ear supports on the shell, the anti-tilting ability of the ear supports can be improved, the safety of the vehicle can be improved, and the differential oil in the shell can be guided by the ear supports, so that the differential is fully lubricated, and the service life of the transmission components is prolonged.

[0018] (2) By arranging the oil hole in the support, coaxially arranging the oil hole, the threaded hole and the mounting hole, and arranging the perforation in the fixing bolt, the impact of the differential oil on the oil plug can be reduced, and the sealing ability of the shell-reducing assembly can be improved.

[0019] (3) By arranging the oil plug to include a plugging bolt, a plugging ball and a spring, arranging the flushing hole on the support, and making the front end of the fixing bolt have magnetism, the fixing firmness of the plugging bolt can be improved, and the iron filings in the differential oil can be adsorbed, so that the service life of the differential oil is prolonged.

[0020] (4) By limiting the inner diameter of the oil hole and the structure of the spring, the separation difficulty of the plugging ball and the threaded hole can be reduced, so that the filtering effect of the differential oil is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 It is a perspective view of a shell-reducing assembly and a power component combination structure of the application.

[0023] Figure 2 A side view of a shell-reducing assembly of the present application.

[0024] Figure 3 A front view of a shell-reducing assembly of the present application.

[0025] Figure 4 A partial bottom view of a shell-reducing assembly of the present application.

[0026] Figure 5 A side view of a shell-reducing assembly of the present application.

[0027] Figure 6 A sectional view of a shell-reducing assembly of the present application.

[0028] Figure 7 A sectional view of a threaded hole in a shell-reducing assembly of the present application.

[0029] Figure 8 A sectional view of a plugging ball in a shell-reducing assembly of the present application.

[0030] Figure 9 A sectional view of a plugging ball in a shell-reducing assembly of the present application.

[0031] Figure 10 A sectional view of an oil hole in a shell-reducing assembly of the present application.

[0032] Figure 11 A sectional view of a long bolt and a positioning bolt in a manufacturing method of a shell-reducing assembly of the present application.

[0033] Wherein: 1, shell; 101, main shaft hole; 102, oil hole; 103, gear cavity; 2, ear seat; 21, support; 22, top frame; 23, fixing bolt; 201, half shaft hole; 202, threaded hole; 203, mounting hole; 204, through hole; 205, flushing hole; 210, middle plane; 220, end arc surface; 3, oil plug; 31, plugging bolt; 32, plugging ball; 33, spring; 4, flange plate; 5, driving shaft; 6, half driven shaft. DETAILED DESCRIPTION

[0034] The technical solutions in the present application will be described clearly and completely below in combination with the specific embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] The reducing shell assembly is mounted on the axle housing and forms a closed space with the axle housing, and the closed space is used for mounting the power component.

[0036] As shown in Figure 1 The power component includes a driving shaft 5 and two half driven shafts 6, the two half driven shafts 6 are coaxial and spaced apart, and the two half driven shafts 6 are connected through a gear set, the driving shaft 5 is perpendicular to the half driven shaft 6, and the driving shaft 5 and one of the half driven shafts 6 are provided with a bevel gear, and the driving shaft 5 and the half driven shaft 6 are connected through the meshing of the two bevel gears to realize the power transmission between the driving shaft 5 and the half driven shaft 6. Among them, the outer diameter of the bevel gear on the driving shaft 5 is smaller, and the outer diameter of the bevel gear on the half driven shaft 6 is larger, so as to realize the effect of speed reduction. The connection mode of the power component is the prior art, and the reducer shell and axle housing structure assembly and vehicle disclosed in the invention patent with the publication number CN114228402A can be referred to.

[0037] The reducing shell assembly of the application comprises a shell 1, two ear seats 2 and a flange plate 4, the shell 1 is provided with a main shaft hole 101, and the driving shaft 5 is rotatably arranged in the main shaft hole 101 through a bearing; the flange plate 4 is fixedly arranged on the shell 1, the shell 1 is sealingly connected with the axle housing through the flange plate 4, the shell 1 is provided with a gear cavity 103, and after the shell 1 is connected with the rear axle housing, the gear cavity 103 and the inside of the rear axle housing jointly enclose a closed space for mounting the power component.

[0038] The ear seat 2 is provided with a half shaft hole 201, and the two half driven shafts 6 are rotatably arranged in the two half shaft holes 201 through bearings, and the two half shaft holes 201 are coaxially arranged, so as to ensure the coaxiality of the two half driven shafts 6 and ensure the normal operation of the power component.

[0039] As shown in Figures 2-4 The three-dimensional rectangular coordinate system O-xyz is established with the intersection point of the half shaft hole 201 axis and the main shaft hole 101 axis as the origin O, the half shaft hole 201 axis as the x-axis, the main shaft hole 101 axis as the y-axis, and the straight line perpendicular to the x-axis and y-axis and passing through the origin O as the z-axis.

[0040] As shown in Figure 1 The two bevel gears between the driving shaft 5 and the half driven shaft 6 are located between the two ear seats 2, as shown in Figure 4 The distance between the two ear seats 2 gradually decreases in the direction away from the shell 1, that is, the two ear seats 2 are arranged in an eight-character shape on the shell 1; by tilting the ear seat 2, the anti-tilting performance of the ear seat 2 can be improved, and when the half driven shaft 6 is subjected to extrusion or impact, the two bevel gears are less likely to separate than in the prior art, thereby protecting the power component from damage as much as possible, which helps to improve the safety of the vehicle.

[0041] In order to ensure the normal operation of the power components, the differential oil needs to be injected into the gear cavity 103, and the power components are related to the power of the vehicle. In order to avoid the differential oil generating greater resistance to the power components, the amount of differential oil needs to be reduced, and the rotation of the bevel gear on the half axle 6 drives the differential oil to spread in the gear cavity 103 to fully lubricate each gear.

[0042] As shown in Figure 3 , the two ear seats 2 are centrally symmetrical about the center line of the shell 1, the distance of one ear seat 2 from the yoz plane gradually decreases along the positive direction of the z axis, and the distance of the other ear seat 2 from the yoz plane gradually increases along the positive direction of the z axis; since the inclination directions of the two ear seats 2 are consistent and are located on both sides of the bevel gear, when the bevel gear on the half axle 6 rotates bidirectionally and drives the differential oil to circulate, one of the ear seats 2 can drive the differential oil to the bevel gear, thereby helping to improve the lubrication efficiency of the differential oil on the gear.

[0043] As shown in Figure 2 and Figure 3 , the side of the ear seat 2 close to the main shaft hole 101 includes a middle plane 210 and two end arc surfaces 220, the middle plane 210 is located at the middle position of the ear seat 2, the two end arc surfaces 220 are respectively located at both ends of the middle plane 210 and are continuously arranged with the middle plane 210, and the end of the end arc surface 220 away from the middle plane 210 is located on the side of the middle plane 210 close to the main shaft hole 101, forming a composite surface with better guiding effect, so that the middle plane 210 and the two end arc surfaces 220 better guide the differential oil and improve the anti-backflow effect of the differential oil.

[0044] As shown in Figure 2 and Figure 3 , the lower end of the end arc surface 220 below the left ear seat 2 is tangent to the inner wall of the gear cavity 103, and the upper end of the end arc surface 220 above the right ear seat 2 is tangent to the inner wall of the gear cavity 103, so that the differential oil can better flow into the gear cavity 103 after being guided by the end arc surface 220, further improving the stability of the circulation of the differential oil.

[0045] The distance between the side of the ear seat 2 away from the main shaft hole 101 and the outer edge position of the shell 1 gradually decreases along the circumference of the shell 1, as shown in Figure 3 , the distance between the left ear seat 2 and the outer edge position of the shell 1 gradually decreases from bottom to top until zero, and the distance between the right ear seat 2 and the outer edge position of the shell 1 gradually decreases from top to bottom until zero.

[0046] As shown in Figure 3As shown, when the differential oil circulates along the path from the upper position of the gear cavity 103 to the lower position of the gear cavity 103, the right side of the left lug 2 can drive the differential oil to the power component, thereby allowing the differential oil to fully lubricate each gear. At the same time, the differential oil will also flow into the gap on the right side of the right lug 2, allowing the differential oil to fully wet the bearing in the right half-shaft hole 201. Conversely, when the differential oil circulates along the path from the upper position of the gear cavity 103 to the lower position of the gear cavity 103, the left side of the right lug 2 can drive the differential oil to the power component, thereby allowing the differential oil to fully lubricate each gear. At the same time, the differential oil will also flow into the gap on the left side of the left lug 2, allowing the differential oil to fully wet the bearing in the left half-shaft hole 201.

[0047] like Figure 6 As shown, the ear seat 2 includes a support 21, a top frame 22, and a fixing bolt 23. The support 21 is fixedly mounted on the housing 1. A threaded hole 202 is provided inside the support 21. The top frame 22 is abutted against the support 21, and the top frame 22 and the support 21 enclose each other to form a half-shaft hole 201. An installation hole 203 is provided inside the top frame 22. The front end of the fixing bolt 23 passes through the installation hole 203 and is connected to the threaded hole 202 through threaded engagement. The bolt head at the rear end of the fixing bolt 23 abuts against the top frame 22, thereby achieving a fixed connection between the top frame 22 and the support 21 to fix the bearing in the half-shaft hole 201.

[0048] like Figure 6 As shown, the bottom side of the top frame 22 is provided with a part of the arc-shaped groove of the half-shaft hole 201, and the top side of the support 21 is provided with another part of the arc-shaped groove of the half-shaft hole 201. The two arc-shaped grooves together form a circular half-shaft hole 201.

[0049] Preferably, the arc angle corresponding to the arc groove on the top frame 22 is slightly larger than the arc angle corresponding to the arc groove on the support 21, thereby preventing the bearing from moving radially along the half-shaft hole 201 during installation; the top side of the support 21 has two planes, which are arranged opposite each other on both sides of the half-shaft hole 201 for abutting connection with the top frame 22. Figure 6 As shown, both planes are inclined, with the height of the end closer to the half-shaft hole 201 being greater than the height of the end farther from the half-shaft hole 201, thereby preventing the top frame 22 from sliding left and right after the support 21 is installed.

[0050] Differential oil needs to be replaced and maintained after a period of use. For this purpose, an oil plug 3 is provided. An oil hole 102 is opened on the housing 1. The oil plug 3 is detachably fixed on the housing 1 and seals the oil hole 102. The oil plug 3 is used to replace the differential oil by removing and installing it from the housing 1.

[0051] like Figure 7 andFigure 10 As shown, a through hole 204 is provided in the fixing bolt 23. The oil hole 102 is connected to the threaded hole 202, the mounting hole 203 and the through hole 204. The oil passage formed by the combination of the oil hole 102, the threaded hole 202, the mounting hole 203 and the through hole 204 is relatively narrow, which makes the impact of differential oil on the oil plug 3 less, which is conducive to ensuring the sealing between the oil plug 3 and the housing 1.

[0052] In a preferred embodiment, the oil plug 3 includes a plugging bolt 31, a plugging ball 32, and a spring 33. The inner diameter of the oil hole 102 is larger than the inner diameter of the threaded hole 202. The plugging bolt 31 is connected to the oil hole 102 by a threaded connection. The outer diameter of the plugging ball 32 is larger than the inner diameter of the threaded hole 202. The plugging ball 32 is slidably disposed in the oil hole 102. The spring 33 is abutted between the plugging ball 32 and the plugging bolt 31. In its natural state, the spring 33 abuts against the plugging ball 32, causing the plugging ball 32 to abut against the inner wall of the threaded hole 202 and seal the threaded hole 202.

[0053] At the same time, since the spring 33 applies elastic force to the sealing bolt 31 fixed on the housing 1, it can effectively improve the anti-loosening ability of the sealing bolt 31 and further improve the sealing ability between the oil plug 3 and the housing 1.

[0054] Gears in power components produce iron filings during operation, which are a significant factor affecting the life of differential oil.

[0055] like Figure 8 As shown, a flushing hole 205 is provided on the side of the support 21 near the spindle hole 101. The flushing hole 205 is located on one side of the sealing ball 32. The outer side of the front end of the fixing bolt 23 is chamfered, and the outer side of the front end of the fixing bolt 23 is magnetic. The magnetism of the outer side of the front end of the fixing bolt 23 can be achieved by embedding a magnet or the like.

[0056] Because the side of the support 21 closest to the main shaft hole 101 is inclined, the circulating differential oil can more easily flow into the flushing hole 205. Once the differential oil flows into the flushing hole 205, it can push the sealing ball 32, causing the spring 33 to contract and the sealing ball 32 to move away from the threaded hole 202. This allows the differential oil entering the flushing hole 205 to flow back into the gear cavity 103 along the threaded hole 202 and the through hole 204. During this flow process, iron filings in the differential oil can be adsorbed onto the circumferential position of the front end of the fixing bolt 23, thereby purifying the differential oil.

[0057] like Figure 8 As shown, the iron filings adsorbed on the front peripheral position of the fixing bolt 23 will enter the gap between the fixing bolt 23 and the inner wall of the threaded hole 202 due to the flushing of the differential oil, thereby improving the fixing firmness and anti-loosening ability of the fixing bolt 23.

[0058] Spring 33 serves to enhance the secure fixing of the sealing bolt 31; therefore, the spring force of spring 33 is relatively large, making it difficult for the sealing ball 32 to be moved by the differential oil entering the flushing hole 205. To solve this problem, the oil hole 102 extends into the support 21, and the oil hole 102 is coaxially arranged with the threaded hole 202. The inner diameter of the oil hole 102 is larger than the inner diameter of the threaded hole 202, and the outer diameter of the sealing ball 32 is smaller than the inner diameter of the oil hole 102. Figure 9 As shown, when differential oil flows into the flushing hole 205, it can push the sealing ball 32 to move radially along the oil hole 102, thereby making it easier for the sealing ball 32 to move away from the threaded hole 202.

[0059] Similarly, the number of turns of the spring 33 on the side closer to the flushing hole 205 can be greater than the number of turns of the spring 33 on the side farther from the flushing hole 205, so that the spring 33 is easier to bend and the sealing ball 32 is easier to move radially along the oil hole 102.

[0060] To facilitate the flow of differential oil into the flushing hole 205, it is preferable to design the end of the flushing hole 205 furthest from the sealing ball 32 as a flared shape. Preferably, the interior of the flushing hole 205 near the sealing ball 32 is threaded.

[0061] like Figure 2 As shown, two fixing bolts 23 are preferably provided between the support 21 and the top frame 22. One fixing bolt 23 is provided with a through hole 204, which cooperates with the oil hole 102 and the oil plug 3. The other fixing bolt 23 is not provided with a through hole 204, and the corresponding position is not provided with an oil hole 102 and an oil plug 3, thereby reducing the structural complexity of the housing assembly.

[0062] The manufacturing method of the shell reduction assembly of the present invention is as follows:

[0063] S1. The housing 1 and the two supports 21 are integrally cast using aluminum alloy casting process. The side of the support 21 away from the housing 1 is ground and polished to ensure the flatness of the plane on the support 21 that abuts against the top frame 22. Then, the oil hole 102, threaded hole 202 and flushing hole 205 are machined and shaped.

[0064] S2, the top frame 22 is cast using aluminum alloy casting process, and the side of the top frame 22 that abuts against the support 21 is ground and polished to ensure the flatness of the surface of the top frame 22 that abuts against the support 21. Then the mounting hole 203 is machined and shaped.

[0065] S3, pass the front end of the long bolt through the mounting hole 203 and screw it into the threaded hole 202, and use the threaded head at the rear end of the long bolt to hold and fix the top frame 22 against the support 21. The length of the long bolt is greater than the length of the fixing bolt 23. After the long bolt is fixed, the flushing hole 205 is located on the periphery of the long bolt.

[0066] S4, such as Figure 11 As shown, the positioning bolt is screwed into the flushing hole 205, and the front end of the positioning bolt abuts against the periphery of the long bolt to hold and fix the long bolt, thereby improving the anti-loosening ability of the long bolt and strengthening the fixing firmness between the top frame 22 and the support 21.

[0067] S5, reprocess the half-shaft hole 201 between the two supports 21 and the top frame 22, such as grinding and polishing, to ensure the coaxiality of the two half-shaft holes 201, and then check whether the coaxiality of the two half-shaft holes 201 meets the standard.

[0068] During this process, the long bolts and positioning bolts strengthen the connection between the top frame 22 and the support 21, which can effectively improve the machining accuracy of the half-shaft hole 201, thereby further improving the coaxiality of the two half-shaft holes 201, allowing the two half-shafts 6 to be set coaxially, and ensuring the normal operation of the power components.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A shell reducing assembly, comprising a shell (1) and two ear seats (2), the shell (1) is provided with a main shaft hole (101) for installing a driving shaft (5); the ear seat (2) is fixedly arranged on the shell (1), the ear seat (2) is provided with a half shaft hole (201), and two half shaft holes (201) are coaxially arranged and used for installing two half driven shafts (6) respectively; characterized in that a three-dimensional rectangular coordinate system is established with the intersection of the axis of the half shaft hole (201) and the axis of the main shaft hole (101) as an origin O, the axis of the half shaft hole (201) as an x-axis, the axis of the main shaft hole (101) as a y-axis, and a straight line perpendicular to the x-axis and the y-axis and passing through the origin O as a z-axis, the distance between the ear seat (2) and the yoz plane gradually decreases or increases along the z-axis direction, the two ear seats (2) are centrally symmetric about the center line of the shell (1), and the distance between the two ear seats (2) gradually decreases in a direction away from the shell (1); the ear seat (2) comprises a support (21), a top frame (22) and a fixing bolt (23), the support (21) is fixedly arranged on the shell (1) and is provided with a threaded hole (202) in the inside; the top frame (22) is abuttingly arranged on the support (21) and forms the half shaft hole (201) together with the support (21), and the top frame (22) is provided with a mounting hole (203) in the inside; the fixing bolt (23) is connected in the threaded hole (202) in a threaded fit and penetrates the mounting hole (203), and the fixing bolt (23) abuts against the top frame (22); further comprising an oil plug (3), the shell (1) is provided with an oil hole (102), the oil plug (3) is detachably fixed on the shell (1) and blocks the oil hole (102); the fixing bolt (23) is provided with a through hole (204) in the inside, and the through hole (204) is communicated with the oil hole (102); the oil plug (3) comprises a blocking bolt (31), a blocking ball (32) and a spring (33), the blocking bolt (31) is connected in the oil hole (102) in a threaded fit; the blocking ball (32) is slidingly arranged in the oil hole (102) and blocks the threaded hole (202); the spring (33) is arranged between the blocking ball (32) and the blocking bolt (31); a flushing hole (205) is formed on one side of the support (21) close to the main shaft hole (101), and the flushing hole (205) is located on one side of the blocking ball (32); the outer side of the front end of the fixing bolt (23) is provided with a chamfer and has magnetism.

2. A reduction shell assembly as defined in claim 1, wherein: the oil hole (102) penetrates into the support (21) and is coaxially arranged with the threaded hole (202), and the inner diameter of the oil hole (102) is greater than the inner diameter of the threaded hole (202); the outer diameter of the blocking ball (32) is greater than the inner diameter of the threaded hole (202) and less than the inner diameter of the oil hole (102). The number of turns of the spring (33) on the side close to the flushing hole (205) is greater than the number of turns of the spring (33) on the side away from the flushing hole (205).

3. A reduction shell assembly as in claim 1, wherein: The distance between the side of the ear seat (2) away from the main shaft hole (101) and the outer edge of the shell (1) gradually decreases along the circumference of the shell (1).

4. A reduction shell assembly as defined in claim 3, wherein: The side of the ear seat (2) close to the main shaft hole (101) comprises a middle plane (210) and two end arc surfaces (220), the middle plane (210) is located at the middle position of the ear seat (2); the two end arc surfaces (220) are respectively located at the two ends of the middle plane (210) and are continuously arranged with the middle plane (210), and the end of the end arc surface (220) away from the middle plane (210) is located on the side of the middle plane (210) close to the main shaft hole (101).

5. A reduction shell assembly as defined in claim 4, wherein: The shell (1) is provided with a gear cavity (103), and one end of one of the end arc surfaces (220) is tangent to the inner wall of the gear cavity (103).

6. A reduction shell assembly as in claim 1, wherein: A flange (4) is further included, and the flange (4) is fixedly arranged on the shell (1).

7. A method of manufacturing a reduced shell assembly as defined in claim 2, wherein, The method comprises the following steps: S1, integrally casting the shell (1) and the two supports (21), and polishing the side of the support (21) away from the shell (1), and processing and forming the oil hole (102), the threaded hole (202) and the flushing hole (205); S2, casting the two top frames (22), and polishing the side of the top frame (22) used for abutting against the support (21), and processing and forming the mounting hole (203); S3, fixing the top frame (22) on the support (21) by using a long bolt matched with the threaded hole (202) and the mounting hole (203), and the front end of the long bolt is located on the side of the flushing hole (205) close to the shell (1); S4, screwing a positioning bolt into the flushing hole (205), and abutting the front end of the positioning bolt against the circumferential side of the long bolt; S5, reprocessing the two half shaft holes (201), and detecting the coaxiality of the two half shaft holes (201).

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