Speed reducer shell assembly and manufacturing method thereof

Abstract

The invention relates to the technical field of vehicle transmission mechanisms, and provides a speed reducer shell assembly and a manufacturing method thereof.The speed reducer shell assembly comprises a shell body and two lug seats, and a main shaft hole is formed in the shell body and used for installing a driving shaft; the lug seat is fixedly arranged on the shell, half shaft holes are formed in the lug seat, and the two half shaft holes are coaxially formed and are used for installing two half driven shafts respectively; the distance between the lug seats and the yoz plane is gradually decreased or increased in the z-axis direction, the two lug seats are in central symmetry about the center line of the shell, and the distance between the two lug seats is gradually decreased in the direction away from the shell. The arrangement positions of the two lugs on the shell are limited, the outward inclination prevention capacity of the lugs can be improved, the safety of a vehicle is improved, differential oil in the shell can be guided through the lugs, a transmission part is fully lubricated by a differential, and the service life of the transmission part is prolonged.

Description

Technical Field

[0001] This invention relates to the field of vehicle transmission mechanism technology, and in particular to a housing assembly and its manufacturing method. Background Technology

[0002] The gearbox assembly provides a sealed space for components such as the differential and reducer. It not only prevents dust, water and other impurities from entering, but also supports and fixes the components, ensuring that the vehicle can work stably.

[0003] The reducer assembly integrates a series of transmission components used to reduce speed and increase torque, such as the drive shaft, main shaft gear, driven shaft, and axle gear. To improve the operational stability of the transmission components, corresponding mounting mechanisms need to be installed within the reducer assembly. For example, the reducer assembly and reducer housing assembly disclosed in invention patent CN113007318B have two mounting seats on the housing for mounting the output shaft bearing. After the driven shaft is installed in the output shaft bearing, the coaxiality of the two driven shafts can be ensured.

[0004] The drive shaft and one of the driven shafts are usually connected by two bevel gears. When the vehicle axle is squeezed or impacted, the driven shaft will bend, causing the mounting bracket to tilt outward. This will not only damage the structural shape of the reducer and axle housing, but also cause the two bevel gears between the drive shaft and the driven shaft to separate, resulting in transmission component failure and compromising vehicle safety. Summary of the Invention

[0005] In view of this, the present invention proposes a shell reduction assembly and its manufacturing method, which can improve the anti-tilt capability of the shell by adjusting the angle between the lug and the shell, thereby improving the safety of the vehicle.

[0006] The technical solution of the present invention is implemented as follows: On one hand, the present invention provides a housing assembly, including a housing and two lugs. The housing has a main shaft hole for mounting a drive shaft. The lugs are fixedly mounted on the housing and have half-shaft holes. The two half-shaft holes are coaxially arranged and are respectively used to mount two half-driven shafts. A three-dimensional rectangular coordinate system is established with the intersection of the axis of the half-shaft hole and the axis of the main shaft hole as the origin O, the axis of the half-shaft hole as the x-axis, the axis of the main shaft hole as the y-axis, and a straight line perpendicular to both the x-axis and the y-axis and passing through the origin O as the z-axis. The distance between the lugs and the yoz plane gradually decreases or increases along the z-axis direction. The two lugs are centrally symmetrical about the center line of the housing, and the distance between the two lugs gradually decreases in the direction away from the housing.

[0007] Based on the above technical solutions, preferably, the ear seat includes a support, a top frame, and a fixing bolt. The support is fixedly mounted on the housing and has a threaded hole inside. The top frame is abutted against the support and surrounds it to form the half-shaft hole, and has an installation hole inside. The fixing bolt is threadedly connected to the threaded hole and passes through the installation hole, and the fixing bolt abuts against the top frame.

[0008] Based on the above technical solutions, preferably, it also includes an oil plug, wherein an oil hole is provided on the housing, the oil plug is detachably fixed on the housing and seals the oil hole; a through hole is provided in the fixing bolt and the through hole is connected to the oil hole.

[0009] Based on the above technical solutions, preferably, the oil plug includes a sealing bolt, a sealing ball, and a spring. The sealing bolt is threadedly connected to the oil hole; the sealing ball is slidably disposed in the oil hole and seals the threaded hole; the spring is abutting between the sealing ball and the sealing bolt; a flushing hole is provided on the side of the support near the spindle hole, and the flushing hole is located on one side of the sealing ball; the outer side of the front end of the fixing bolt is chamfered and has magnetism.

[0010] Based on the above technical solutions, preferably, the oil hole extends through the support and is coaxially arranged with the threaded hole, and the inner diameter of the oil hole is larger than the inner diameter of the threaded hole; the outer diameter of the sealing 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 on the side closer to the flushing hole is greater than the number of turns of the spring on the side farther from the flushing hole.

[0011] Based on the above technical solutions, preferably, the distance between the side of the ear seat away from the main shaft hole and the outer edge of the housing gradually decreases along the circumference of the housing.

[0012] Based on the above technical solutions, preferably, the side of the ear seat near the spindle hole includes a middle plane and two end arc surfaces. The middle plane is located in the middle of the ear seat. The two end arc surfaces are located at both ends of the middle plane and are continuously arranged with the middle plane. The end of the end arc surface away from the middle plane is located on the side of the middle plane near the spindle hole.

[0013] Based on the above technical solutions, preferably, the housing is provided with a gear cavity, and one end of the end arc surface is tangent to the inner wall of the gear cavity.

[0014] Based on the above technical solutions, preferably, a flange is also included, which is fixedly mounted on the housing.

[0015] Secondly, the present invention provides a method for manufacturing a shell-reducing assembly, comprising the following steps: S1, integrally casting the shell and the two supports, and polishing the side of the supports away from the shell, and machining the oil hole, the threaded hole and the flushing hole; S2, casting the two top frames, and polishing the side of the top frames that abuts against the supports, and machining the mounting hole; S3, fixing the top frames to the supports using long bolts that cooperate with the threaded holes and the mounting holes, with the front end of the long bolt located on the side of the flushing hole closer to the shell; S4, screwing a positioning bolt into the flushing hole, and having the front end of the positioning bolt abut against the circumference of the long bolt; S5, re-machining the two half-shaft holes and checking the coaxiality of the two half-shaft holes.

[0016] The shell reduction assembly and its manufacturing method of the present invention have the following advantages over the prior art:

[0017] (1) By limiting the placement of the two lugs on the housing, not only can the anti-tilting capability of the lugs be improved and the safety of the vehicle be enhanced, but the lugs can also guide the differential oil in the housing, so that the differential can fully lubricate the transmission components and extend the service life of the transmission components.

[0018] (2) By setting the oil hole inside the support, making the oil hole coaxial with the bolt hole and the mounting hole, and setting a through hole in the fixing bolt, the impact of differential oil on the oil plug can be reduced, and the sealing ability of the housing assembly can be improved.

[0019] (3) By setting the oil plug to include a sealing bolt, a sealing ball and a spring, opening a flushing hole on the support, and making the front end of the fixing bolt magnetic, not only can the fixing firmness of the sealing bolt be improved, but also iron filings in the differential oil can be adsorbed, thus extending the service life of the differential oil.

[0020] (4) By limiting the inner diameter of the oil hole and the structure of the spring, the difficulty of separating the sealing ball from the threaded hole can be reduced, thereby further improving the filtration effect of the differential oil. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of a combined structure of a shell reduction assembly and a power component according to the present invention.

[0023] Figure 2 This is a perspective view of a housing assembly of the present invention located on one side of the ear seat.

[0024] Figure 3 This is a front view of a shell reduction assembly according to the present invention.

[0025] Figure 4 This is a partial bottom view of a shell reduction assembly according to the present invention.

[0026] Figure 5 This is a perspective view of a housing assembly of the present invention located on the oil plug side.

[0027] Figure 6 This is a cross-sectional view of a shell reduction assembly according to the present invention.

[0028] Figure 7 This is a cross-sectional view of the threaded hole in a shell-reducing assembly according to the present invention.

[0029] Figure 8 This is a cross-sectional view of the sealing ball section of a shell reduction assembly of the present invention when the sealing ball is used to seal a threaded hole.

[0030] Figure 9 This is a cross-sectional view of the sealing ball section of a shell reduction assembly of the present invention when the sealing ball does not seal the threaded hole.

[0031] Figure 10 This is a cross-sectional view of the oil hole in a housing assembly according to the present invention.

[0032] Figure 11 This is a cross-sectional view of the long bolt and positioning bolt in a method for manufacturing a shell-reducing assembly according to the present invention.

[0033] The components are as follows: 1. Housing; 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. Intermediate plane; 220. End arc surface; 3. Oil plug; 31. Sealing bolt; 32. Sealing ball; 33. Spring; 4. Flange; 5. Drive shaft; 6. Half driven shaft. Detailed Implementation

[0034] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0035] The axle housing assembly is mounted on the axle housing and encloses it to form a sealed space for installing the power components.

[0036] like Figure 1 As shown, the power unit includes a drive shaft 5 and two driven shafts 6. The two driven shafts 6 are coaxial and spaced apart, and are connected by a gear set. The drive shaft 5 is perpendicular to the driven shafts 6. A bevel gear is mounted on both the drive shaft 5 and one of the driven shafts 6. The drive shaft 5 and the driven shafts 6 are connected by the meshing of the two bevel gears, realizing the power transmission between the drive shaft 5 and the driven shafts 6. The bevel gear on the drive shaft 5 has a smaller outer diameter, while the bevel gear on the driven shaft 6 has a larger outer diameter, thus achieving a deceleration effect. The connection method of the power unit is existing technology; for details, please refer to the reducer housing and axle housing structure assembly and vehicle disclosed in invention patent publication number CN114228402A.

[0037] The present invention provides a housing assembly comprising a housing 1, two lugs 2, and a flange 4. The housing 1 has a main shaft hole 101, and the drive shaft 5 is rotatably disposed in the main shaft hole 101 via a bearing. The flange 4 is fixedly disposed on the housing 1, and the housing 1 is sealed to the axle housing via the flange 4. The housing 1 has a gear cavity 103. After the housing 1 is connected to the rear axle housing, the gear cavity 103 and the interior of the rear axle housing together enclose a sealed space for installing power components.

[0038] The ear seat 2 is provided with a half shaft hole 201. Two half shafts 6 are rotatably mounted in the two half shaft holes 201 through bearings. The two half shaft holes 201 are coaxially arranged, thereby ensuring the coaxiality of the two half shafts 6 and ensuring the normal operation of the power components.

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

[0040] like Figure 1 As shown, the two bevel gears between the drive shaft 5 and the driven shaft 6 are located between the two lugs 2, as... Figure 4 As shown, the distance between the two ear seats 2 gradually decreases in the direction away from the housing 1, that is, the two ear seats 2 are arranged in a figure-eight shape on the housing 1; by tilting the ear seats 2, this application can improve the anti-tilting performance of the ear seats 2. When the half-shaft 6 is squeezed or impacted, the two bevel gears are less likely to separate relative to the prior art, thereby protecting the power components from damage as much as possible and helping to improve the safety of the vehicle.

[0041] The components in the power unit operate at high speed. In order to ensure the normal operation of the power unit, differential oil needs to be injected into the gear cavity 103. Since the power unit is related to the power of the vehicle, in order to avoid the differential oil from generating too much resistance to the power unit, the amount of differential oil used needs to be reduced. The rotation of the bevel gear on the half-driven shaft 6 is used to drive the differential oil to fill the gear cavity 103, so as to fully lubricate each gear.

[0042] like Figure 3 As shown, the two lugs 2 are symmetrical about the center line of the housing 1. The distance between one lug 2 and the yoz plane gradually decreases along the positive z-axis, while the distance between the other lug 2 and the yoz plane gradually increases along the positive z-axis. Since the two lugs 2 are tilted in the same direction and are located on both sides of the bevel gear, when the bevel gear on the half-shaft 6 rotates in both directions and drives the differential oil to circulate, one of the lugs 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] like Figure 2 and Figure 3 As shown, the side of the ear seat 2 near the main shaft hole 101 includes a central plane 210 and two end arc surfaces 220. The central plane 210 is located in the middle of the ear seat 2, and the two end arc surfaces 220 are located at both ends of the central plane 210 and are continuously arranged with the central plane 210. The end of the end arc surface 220 away from the central plane 210 is located on the side of the central plane 210 near the main shaft hole 101, forming a composite surface with a better guiding effect. This allows the central plane 210 and the two end arc surfaces 220 to better guide the differential oil and improve the anti-backflow effect of the differential oil.

[0044] like Figure 2 and Figure 3 As shown, the lower end of the end arc surface 220 located 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 located above the right ear seat 2 is tangent to the inner wall of the gear cavity 103. After being guided by the end arc surface 220, the differential oil can flow into the gear cavity 103 better, so as to further improve the stability of the differential oil circulation flow.

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

[0046] like 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 and Figure 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, 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 housing assembly, comprising a housing (1) and two lugs (2), wherein the housing (1) is provided with a main shaft hole (101) for mounting a drive shaft (5); the lugs (2) are fixedly disposed on the housing (1), and the lugs (2) are provided with half shaft holes (201), the two half shaft holes (201) being coaxially disposed and respectively used for mounting two half driven shafts (6); Its features are: 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 the origin O, the axis of the half-shaft hole (201) as the x-axis, the axis of the main shaft hole (101) as the y-axis, and the straight line that is perpendicular to both the x-axis and the y-axis and passes through the origin O as the z-axis. The distance between the ear seat (2) and the yoz plane gradually decreases or increases along the z-axis. The two ear seats (2) are centrally symmetrical about the center line of the housing (1), and the distance between the two ear seats (2) gradually decreases along the direction away from the housing (1).

2. The shell reduction assembly as described in claim 1, characterized in that: 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) and has a threaded hole (202) inside. The top frame (22) is abutted against the support (21) and surrounds it to form the half-shaft hole (201). The top frame (22) has an installation hole (203) inside. The fixing bolt (23) is connected to the threaded hole (202) by threaded engagement and passes through the installation hole (203). The fixing bolt (23) abuts against the top frame (22).

3. The shell reduction assembly as described in claim 2, characterized in that: It also includes an oil plug (3), and an oil hole (102) is provided on the housing (1). The oil plug (3) is detachably fixed on the housing (1) and seals the oil hole (102). The fixing bolt (23) has a through hole (204) which is connected to the oil hole (102).

4. The shell reduction assembly as described in claim 3, characterized in that: The oil plug (3) includes a plugging bolt (31), a plugging ball (32), and a spring (33). The plugging bolt (31) is connected to the oil hole (102) by a threaded connection. The plugging ball (32) is slidably disposed in the oil hole (102) and plugs the threaded hole (202). The spring (33) is abutted between the plugging ball (32) and the plugging bolt (31). The support (21) has a flushing hole (205) on the side near the main shaft hole (101), and 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 has magnetic properties.

5. The shell reduction assembly as described in claim 4, characterized in that: The oil hole (102) extends into the support (21) and is coaxially arranged with the threaded hole (202), and the inner diameter of the oil hole (102) is larger than the inner diameter of the threaded hole (202); The outer diameter of the sealing ball (32) is larger than the inner diameter of the threaded hole (202) and smaller than the inner diameter of the oil hole (102); The number of turns of the spring (33) on the side closer to the scouring hole (205) is greater than the number of turns of the spring (33) on the side farther away from the scouring hole (205).

6. The shell reduction assembly as described in claim 1, characterized in that: The distance between the ear seat (2) away from the main shaft hole (101) and the outer edge of the housing (1) gradually decreases along the circumference of the housing (1).

7. The shell reduction assembly as described in claim 6, characterized in that: The ear seat (2) near the main shaft hole (101) includes a middle plane (210) and two end arc surfaces (220). The middle plane (210) is located in the middle of the ear seat (2). The two end arc surfaces (220) are located at the two ends of the middle plane (210) and are continuously arranged with the middle plane (210). The end of the end arc surface (220) away from the middle plane (210) is located on the side of the middle plane (210) near the main shaft hole (101).

8. The shell reduction assembly as described in claim 7, characterized in that: The housing (1) has a gear cavity (103) inside, one end of the end arc surface (220) is tangent to the inner wall of the gear cavity (103).

9. The housing reduction assembly as described in claim 1, characterized in that: It also includes a flange (4), which is fixedly mounted on the housing (1).

10. A method for manufacturing the shell-reducing assembly as described in claim 5, characterized in that, Includes the following steps: S1, the housing (1) and the two supports (21) are integrally cast, and the side of the support (21) away from the housing (1) is polished. The oil hole (102), the threaded hole (202) and the flushing hole (205) are machined and shaped. S2, the two top frames (22) are cast, and the side of the top frame (22) that abuts against the support (21) is polished, and the mounting hole (203) is machined and shaped; S3, the top frame (22) is fixed on the support (21) by using the long bolt to cooperate 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) near the housing (1); S4, screw the positioning bolt into the flushing hole (205) and make the front end of the positioning bolt abut against the periphery of the long bolt; S5, the two half-shaft holes (201) are re-machined, and the coaxiality of the two half-shaft holes (201) is detected.

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