An intermediate axle inter-axle differential assembly and an assembly method thereof

Abstract

The present invention belongs to the technical field of the inter-axle differential assembly of an automotive middle axle, and discloses an inter-axle differential assembly of a middle axle and an assembly method. The assembly method is used to assemble the inter-axle differential assembly of the middle axle. The inter-axle differential assembly of the middle axle includes a reduction housing and a gear transmission shaft. A bearing seat is installed on the outer side of the reduction housing; the gear transmission shaft penetrates through the reduction housing and the bearing seat. A first roller bearing is sleeved on the outer circumference of the first section of the gear transmission shaft corresponding to the bearing seat. The first inner ring of the first roller bearing abuts against the first shaft shoulder of the first section, the outer wall of the first outer ring of the first roller bearing abuts against the inner wall of the bearing seat, and a first gasket is arranged between the end face of the first outer ring along the axial direction and the bearing seat. By arranging the first gasket between the end face of the first outer ring along the axial direction and the bearing seat, the present invention reduces the wear of the first outer ring, and uses the assembly method to improve the assembly accuracy of the inter-axle differential assembly of the middle axle and avoid oil leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of the intermediate axle inter-axle differential assembly in an automobile, and particularly relates to an intermediate axle inter-axle differential assembly and an assembly method thereof. Background Art

[0002] The function of the main reducer of the drive axle is to reduce speed and increase torque through gear meshing for the torque transmitted by the transmission or the universal drive device, and at the same time change the torque transmission direction. The sealing performance of the main reducer assembly of the drive axle is an important index for judging the quality of the main reducer assembly of the drive axle. When assembling the main reducer of the drive axle, the existing assembly method is to sequentially drop and install the rear bevel gear with the tapered roller bearing assembly, the inter-axle differential assembly, and the driving cylindrical gear assembly into the intermediate axle reducer housing, then place the cylindrical gear shaft with the inner race roller assembly of the tapered roller at the input end of the intermediate axle into the main reducer housing of the intermediate axle, connect the upper cover to the main reducer housing of the intermediate axle through bolts, then install the outer race of the tapered roller bearing at the input end of the intermediate axle onto the upper cover, and then install the adjusting ring and the oil seal assembly onto the upper cover with a torque of (250 - 300) N·m. Before assembling the adjusting ring and the oil seal assembly, an appropriate amount of thread locking adhesive needs to be evenly applied to the external thread of the adjusting ring, and it is necessary to ensure that the inner and outer races of the tapered roller are fully fitted and tightened. After that, the adjusting ring is retracted by 1 / 4 turn, the adjusting ring is finely adjusted, and it is ensured that the lock tab slot of the adjusting ring is aligned with the adjusting ring lock tab mounting bolt hole provided on the upper cover, then the adjusting ring lock tab is installed, the lock bolt of the adjusting ring lock tab is screwed in, and then the input flange and the input flange sealing O-ring are sequentially assembled, and then the flange nut is tightened with a torque of (900 - 1000) N·m. Since there is a clearance fit between the outer race of the bearing at the input end of the intermediate axle and the upper cover, and there is a retraction phenomenon during the installation of the adjusting ring, it will cause the outer race of the bearing to move and the end face of the adjusting ring to wear, seriously affecting the normal use of the main reducer assembly of the intermediate axle. Therefore, there is an urgent need for an intermediate axle inter-axle differential assembly and an assembly method to solve the above problems. Summary of the Invention

[0003] An object of the present invention is to provide an intermediate axle inter-axle differential assembly, by providing a first gasket between the end face along the axial direction of the first outer ring and the bearing housing, reducing the wear of the first outer ring and avoiding oil leakage.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] An intermediate axle inter-axle differential assembly includes:

[0006] A reduction housing, and a bearing housing is installed on the outer side of the reduction housing;

[0007] A gear transmission shaft passes through the reduction housing and the bearing seat. A first roller bearing is sleeved on the outer periphery of the first section of the gear transmission shaft corresponding to the bearing seat. The first inner ring of the first roller bearing abuts against the first shoulder of the first section. The outer wall of the first outer ring of the first roller bearing abuts against the inner wall of the bearing seat, and a first gasket is arranged between the axial end face of the first outer ring and the bearing seat.

[0008] As an optional technical solution, a flange is also sleeved on the outer periphery of the first section, and the flange abuts against the side of the first inner ring away from the first shoulder. A dust cover is tightly sleeved on the outer periphery of the flange, and the dust cover tightly abuts against the bearing seat to seal the gap between the bearing seat and the gear transmission shaft.

[0009] As an optional technical solution, an oil seal is also tightly fitted on the outer periphery of the first section, and the oil seal is located on the side of the dust cover facing the first roller bearing. The outer wall of the oil seal is tightly abutted against the inner wall of the bearing seat, and the oil seal is extended toward one side of the dust cover to be provided with a dustproof lip, and the dustproof lip is abutted against the dust cover.

[0010] Another object of the present invention is to provide an assembly method for improving the assembly accuracy of the intermediate axle inter-axle differential assembly and avoiding oil leakage.

[0011] To achieve this object, the present invention adopts the following technical solutions:

[0012] An assembly method is provided, the assembly method being used to assemble the intermediate axle inter-axle differential assembly as described above, the assembly method comprising the following steps:

[0013] S100, pressing and installing the bearing seat with the first gasket and the first outer ring on the reduction housing, and detecting the axial movement of the gear transmission shaft. If the axial movement exceeds a preset range, replace the first gasket; if the axial movement is within the preset range, proceed to the next step;

[0014] S200, removing the bearing seat on which the first gasket and the first outer ring are installed from the reduction housing, and pressing the oil seal into the through hole of the bearing seat at a uniform speed;

[0015] S300, install the bearing seat equipped with the first gasket, the first outer ring and the oil seal on the reduction housing, and then sleeve the flange equipped with the dust cover on the outer periphery of the first section and make the flange abut against the side of the first inner ring away from the first shaft shoulder.

[0016] As an alternative technical solution, before the step S100, the following steps are further included: S101. Obtain the first gasket with a preset thickness. The step S101 is specifically as follows:

[0017] Measure the distance L1 between the first flange surface and the bottom surface of the hole. The first flange surface is the end surface where the bearing housing axially abuts against the reduction housing, and the bottom surface of the hole is the end surface where the bearing housing axially abuts against the first gasket.

[0018] Install the gear transmission shaft sleeved with the first roller bearing into the reduction housing, axially press the first outer ring with a preset pressure, so that the first outer ring presses the first roller assembly of the first roller bearing, and measure the distance L2 between the second flange surface and the end surface of the outer ring. The second flange surface is the end surface where the reduction housing axially abuts against the first flange surface, and the end surface of the outer ring is the end surface where the first outer ring is pressed by the preset pressure.

[0019] Calculate the theoretical thickness value L of the first gasket, where L = L1 - L2 + H, and select the first gasket with the actual thickness value L' according to the theoretical thickness value L. And L', L, L1, L2, and H are all in millimeters.

[0020] As an alternative technical solution, before the oil seal is uniformly pressed into the through hole of the bearing housing, the following steps are further included: S201. Clean the oil seal and the through hole of the bearing housing, and apply lubricating grease to the oil seal.

[0021] As an alternative technical solution, before the step S300, the following steps are further included: S301. Apply sealant to the second flange surface.

[0022] As an alternative technical solution, before the step S100, the following steps are further included: S001. Install the second outer ring of the second roller bearing into the bearing installation hole of the reduction housing. The second outer ring and the reduction housing form a first assembly.

[0023] As an alternative technical solution, before the step S100, the following steps are further included: S002. Install the second inner ring and the second roller assembly of the second roller bearing on the outer periphery of the rear bevel gear, and install the first bushing into the mating hole of the rear bevel gear. The second inner ring, the second roller assembly, the first bushing, and the rear bevel gear form a second assembly.

[0024] As an alternative technical solution, before the step S100, the following steps are further included: S003. Install the oil collecting cover on the oil collecting mating surface of the differential housing. The oil collecting cover and the differential housing form a third assembly.

[0025] As an alternative technical solution, before the step S100, the following steps are further included: S004. Install a second bushing and a needle bearing in sequence on the outer periphery of the gear shaft of the cross shaft, and the needle bearing is located on the side of the second bushing away from the central axis of the cross shaft, and then install a planetary gear on the outer periphery of the needle bearing. The second bushing, the needle bearing, the cross shaft and the planetary gear form a fourth assembly.

[0026] As an alternative technical solution, after the step S004, the following steps are further included: S005. Install the fourth assembly into the differential housing, and the third assembly and the fourth assembly form a fifth assembly.

[0027] As an alternative technical solution, before the step S100, the following steps are further included: S006. Install a third bushing into the bushing fitting hole of the cylindrical gear, and the third bushing and the cylindrical gear form a sixth assembly.

[0028] As an alternative technical solution, before the step S100, the following steps are further included: S007. Install the first inner ring and the first roller assembly on the outer periphery of the gear transmission shaft. The first inner ring, the first roller assembly and the gear transmission shaft form a seventh assembly.

[0029] As an alternative technical solution, before the step S100, the following steps are further included: S008. Sheath a dust cover on the outer periphery of the flange, and the dust cover and the flange form an eighth assembly.

[0030] As an alternative technical solution, before the step S100, the following steps are further included:

[0031] S009. Install the second assembly, the second gasket, the fifth assembly and the sixth assembly into the first assembly in sequence, and the second roller assembly abuts against the second outer ring;

[0032] S010. Install the seventh assembly into the reduction housing;

[0033] S011. Sheath the eighth assembly on the outer periphery of the gear transmission shaft, and make the dust cover closely abut against the bearing seat.

[0034] The beneficial effects of the present invention are as follows:

[0035] The present invention provides an intermediate axle inter-axle differential assembly. A first roller bearing is sleeved on the outer periphery of the first section of the gear transmission shaft corresponding to the bearing seat of the intermediate axle inter-axle differential assembly. The first roller bearing supports the gear transmission shaft, enabling the gear transmission shaft to rotate within the reduction housing. A first gasket is provided between the axial end face of the first outer ring and the bearing seat to prevent the direct contact between the axial end face of the first outer ring and the bearing seat, reduce the wear of the first outer ring, and avoid oil leakage.

[0036] The present invention provides an assembly method which assembles the intermediate axle inter-axle differential assembly as described above, improves the assembly accuracy of the intermediate axle inter-axle differential assembly, and avoids oil leakage. Brief Description of the Drawings

[0037] The following further elaborates on the present invention based on the drawings and embodiments;

[0038] Figure 1 It is a partial cross-sectional view of the intermediate axle inter-axle differential assembly described in the embodiment;

[0039] Figure 2 It is another partial cross-sectional view of the intermediate axle inter-axle differential assembly described in the embodiment;

[0040] Figure 3 It is a cross-sectional view of the bearing seat described in the embodiment;

[0041] Figure 4 It is a partial cross-sectional view of the first component described in the embodiment;

[0042] Figure 5 It is a cross-sectional view of the second component described in the embodiment;

[0043] Figure 6 It is a cross-sectional view of the third component described in the embodiment;

[0044] Figure 7 It is a cross-sectional view of the fourth component described in the embodiment;

[0045] Figure 8 It is a cross-sectional view of the fifth component described in the embodiment;

[0046] Figure 9 It is a cross-sectional view of the sixth component described in the embodiment;

[0047] Figure 10 It is a cross-sectional view of the seventh component described in the embodiment;

[0048] Figure 11 It is a cross-sectional view of the eighth component described in the embodiment;

[0049] Figure 12 It is a flow chart of the assembly method described in the embodiment.

[0050] In the figure:

[0051] 1. Reduction housing; 101. Second flange surface; 2. Bearing seat; 201. First flange surface; 202. Hole bottom surface; 3. Gear transmission shaft; 4. First roller bearing; 41. First inner ring; 42. First outer ring; 421. Outer ring end face; 43. First roller assembly; 5. First gasket; 6. Flange; 7. Dust cover; 8. Oil seal; 81. Dust lip; 9. Second roller bearing; 91. Second outer ring; 92. Second inner ring; 93. Second roller assembly; 10. Rear bevel gear; 11. First bushing; 12. Oil collecting cover; 13. Differential housing; 14. Second bushing; 15. Needle bearing; 16. Cross shaft; 17. Planet gear; 18. Third bushing; 19. Cylindrical gear; 20. Locking nut; 21. Second gasket. Detailed implementation manners

[0052] To make the technical problems solved, the technical solutions adopted, and the achieved technical effects of the present invention clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0054] As Figures 1 to 11 shown, this embodiment provides an intermediate axle interaxle differential assembly, which includes a reduction housing 1 and a gear transmission shaft 3. A bearing seat 2 is installed on the outside of the reduction housing 1; the gear transmission shaft 3 penetrates through the reduction housing 1 and the bearing seat 2. A first roller bearing 4 is sleeved on the outer periphery of the first section of the gear transmission shaft 3 corresponding to the bearing seat 2. The first inner ring 41 of the first roller bearing 4 abuts against the first shoulder of the first section, the outer wall of the first outer ring 42 of the first roller bearing 4 abuts against the inner wall of the bearing seat 2, and a first gasket 5 is provided between the end face of the first outer ring 42 in the axial direction and the bearing seat 2.

[0055] Specifically, when the external driving member drives the gear transmission shaft 3 to rotate in the reduction housing 1, the first roller bearing 4 supports the gear transmission shaft 3. The first roller bearing 4 includes a first inner ring 41, a first roller assembly 43 and a first outer ring 42. The first inner ring 41 is tightly sleeved on the outer periphery of the gear transmission shaft 3. The first inner ring 41 can rotate synchronously with the gear transmission shaft 3. The first roller assembly 43 is located between the outer wall of the first inner ring 41 and the inner wall of the first outer ring 42. The first outer ring 42 is fixedly installed in the inner wall of the bearing seat 2. A first gasket 5 is arranged between the end face along the axial direction and the bearing seat 2 to avoid direct contact between the end face of the first outer ring 42 along the axial direction and the bearing seat 2, reduce the wear of the first outer ring 42, and avoid oil leakage. The first gasket 5 is arranged between the end face of the first outer ring 42 along the axial direction and the bearing seat 2. The first gasket 5 can be replaced by removing the bearing seat 2 from the reduction housing 1, so that the first gasket 5 of suitable thickness can be selected during the assembly of the differential assembly between the middle axle shafts, so as to reduce the axial movement of the gear transmission shaft 3, improve the assembly accuracy of the differential assembly between the middle axle shafts, and avoid oil leakage.

[0056] Optionally, a flange 6 is also sleeved on the outer periphery of the first section, and the flange 6 abuts against the side of the first inner ring 41 away from the first shoulder. A dust cover 7 is tightly sleeved on the outer periphery of the flange 6, and the dust cover 7 tightly abuts against the bearing seat 2 to seal the gap between the bearing seat 2 and the gear transmission shaft 3, so as to prevent grease from leaking through the gap to the outside or external impurities from passing through the gap into the interior of the reduction housing 1.

[0057] Optionally, an oil seal 8 is tightly fitted on the outer periphery of the first section. The oil seal 8 is located on the side of the dust cover 7 facing the first roller bearing 4. The outer wall of the oil seal 8 is tightly abutted against the inner wall of the bearing seat 2. The oil seal 8 is extended toward one side of the dust cover 7 and is provided with a dustproof lip 81, which abuts against the dust cover 7.

[0058] The existing drive axle main reducer presses the oil seal onto the adjusting ring, and the adjusting ring is then connected to the upper cover through threads. Due to the yaw phenomenon between the threaded connections, the coaxiality between the oil seal lip and the flange mating surface cannot be guaranteed. As a result, oil leakage occurs at the input end of the mid-axle main reducer assembly on the market. During assembly, thread locking glue is applied to the adjusting ring threads. After the oil seal leaks, the adjusting ring needs to be removed and replaced, but the adjusting ring cannot be removed.

[0059] In this embodiment, the adjusting ring is eliminated and the bearing seat 2 is adopted. The oil seal 8 can be directly pressed onto the bearing seat 2. The first outer ring 42 and the inner wall of the bearing seat 2 have an interference fit, which can avoid oil leakage from the oil seal 8, the inability to disassemble the adjusting ring and the oil seal 8, the first roller bearing 4 running on the outer ring, and the wear of the end face of the adjusting ring.

[0060] In this embodiment, the oil seal 8 is directly press-fitted onto the bearing housing 2. At the same time, the flange 6 is assembled onto the gear transmission shaft 3 through a spline to ensure that the coaxiality tolerance between the oil seal lip of the oil seal 8 and the mating surface of the flange 6 is maintained within a preset range, effectively reducing the risk of eccentric wear of the oil seal 8, enhancing the service life of the oil seal 8, enhancing the sealing effect, and eliminating the oil leakage risk caused by manufacturing, assembly and other errors of the parts at the input end of the intermediate axle differential assembly.

[0061] As Figure 12 shown, this embodiment also provides an assembly method for assembling the above intermediate axle differential assembly. The assembly method includes the following steps:

[0062] S100. Press and install the bearing housing 2 with the first gasket 5 and the first outer ring 42 onto the reduction housing 1, and detect the axial end play of the gear transmission shaft 3. If the axial end play exceeds the preset range, replace the first gasket 5. If the axial end play is within the preset range, proceed to the next step.

[0063] S200. Remove the bearing housing 2 with the first gasket 5 and the first outer ring 42 from the reduction housing 1, and press the oil seal 8 into the through hole of the bearing housing 2 at a uniform speed.

[0064] S300. Install the bearing housing 2 with the first gasket 5, the first outer ring 42 and the oil seal 8 onto the reduction housing 1, then sleuth the flange 6 with the dust cover 7 on the outer periphery of the first section and make the flange 6 abut against the side of the first inner ring 41 away from the first shoulder.

[0065] In step S100, if the axial end play of the gear transmission shaft 3 exceeds the preset range, remove the bearing housing 2 with the first gasket 5 and the first outer ring 42 from the reduction housing 1, replace the first gasket 5 with a thicker one, and then press and install the bearing housing 2 with the thicker first gasket 5 and the first outer ring 42 onto the reduction housing 1. By replacing the first gasket 5, the axial end play of the gear transmission shaft 3 can be reduced, and the assembly accuracy of the intermediate axle differential assembly can be improved.

[0066] In step S200, remove the bearing housing 2 with the first gasket 5 and the first outer ring 42 from the reduction housing 1, and then press the oil seal 8 into the through hole of the bearing housing 2 at a uniform speed, which can avoid the force of pressing the oil seal 8 into the bearing housing 2 acting on the reduction housing 1 or the components located within the reduction housing 1, and can ensure the installation accuracy of the oil seal 8 on the bearing housing 2.

[0067] In step S300, making the flange 6 abut against the side of the first inner ring 41 away from the first shoulder can prevent the first roller bearing 4 from axially moving.

[0068] Optionally, before step S100, the following step is further included: S101. Obtain a first gasket 5 with a preset thickness. Specifically, step S101 is as follows:

[0069] Measure the distance L1 between the first flange surface 201 and the bottom surface of the hole 202. The first flange surface 201 is the end surface of the bearing housing 2 axially abutting against the reduction housing 1, and the bottom surface of the hole 202 is the end surface of the bearing housing 2 axially abutting against the first gasket 5. Install the gear transmission shaft 3 sleeved with the first roller bearing 4 into the reduction housing 1, and axially press the first outer ring 42 with a preset pressure, so that the first outer ring 42 presses the first roller assembly 43 of the first roller bearing 4, and measure the distance L2 between the second flange surface 101 and the end surface 421 of the outer ring. The second flange surface 101 is the end surface of the reduction housing 1 axially abutting against the first flange surface 201, and the end surface 421 of the outer ring is the end surface where the first outer ring 42 is pressed with a preset pressure. Calculate the theoretical thickness value L of the first gasket 5, where L = L1 - L2 + H, and select the first gasket 5 with the actual thickness value L' according to the theoretical thickness value L. Here, L', L, L1, L2, and H are all in millimeters.

[0070] Specifically, H = 0.06 mm. For example, if L1 is 30.05 mm and L2 is 27.85 mm, then the theoretical thickness value L = 30.05 - 27.85 + 0.06 = 2.26 mm. However, in the national standard, there is no first gasket 5 with the actual thickness value L' equal to 2.26 mm, but there is a first gasket 5 with the actual thickness value L' equal to 2.27 mm. Therefore, select the first gasket 5 with the actual thickness value L' equal to 2.27 mm and install it into the bearing housing 2. Another example, if L1 is 29.95 mm and L2 is 28.60 mm, then the theoretical thickness value L = 29.95 - 28.6 + 0.06 = 1.41 mm. However, in the national standard, there is no first gasket 5 with the actual thickness value L' equal to 1.41 mm, but there is a first gasket 5 with the actual thickness value L' equal to 1.42 mm. Therefore, select the first gasket 5 with the actual thickness value L' equal to 1.42 mm and install it into the bearing housing 2.

[0071] Optionally, before the oil seal 8 is evenly pressed into the through hole of the bearing housing 2, the following step is further included: S201. Clean the oil seal 8 and the through hole of the bearing housing 2, and apply grease to the oil seal 8. In step S201, clean the surface of the oil seal 8 and the through hole of the bearing housing 2 to avoid adhesion of impurities, and apply grease to the surface of the oil seal 8, so as to avoid the oil seal 8 being damaged during the process of installing the oil seal 8 into the bearing housing 2, avoid cracks or embossments on the oil seal 8, and ensure that the lubricating oil inside the reduction housing 1 cannot leak to the outside through the indentations or embossments.

[0072] Optionally, before step S300, the following step is further included: S301, applying a sealant on the second flange surface 101. The sealant is silicone sealant to improve the installation accuracy between the bearing housing 2 and the reduction housing 1 and avoid gaps on the contact end faces between the bearing housing 2 and the reduction housing 1.

[0073] Optionally, before step S100, the following step is further included: S001, installing the second outer ring 91 of the second roller bearing 9 into the bearing mounting hole of the reduction housing 1. The second outer ring 91 and the reduction housing 1 form a first assembly.

[0074] Optionally, before step S100, the following step is further included: S002, installing the second inner ring 92 and the second roller assembly 93 of the second roller bearing 9 on the outer periphery of the rear bevel gear 10, and installing the first bushing 11 into the mating hole of the rear bevel gear 10. The second inner ring 92, the second roller assembly 93, the first bushing 11 and the rear bevel gear 10 form a second assembly.

[0075] Optionally, before step S100, the following step is further included: S003, installing the oil collecting cover 12 on the oil collecting mating surface of the differential housing 13. The oil collecting cover 12 and the differential housing 13 form a third assembly.

[0076] Optionally, before step S100, the following step is further included: S004, installing the second bushing 14 and the needle roller bearing 15 in sequence on the outer periphery of the gear shaft of the cross shaft 16, and the needle roller bearing 15 is located on the side of the second bushing 14 away from the central axis of the cross shaft 16, and then installing the planetary gear 17 on the outer periphery of the needle roller bearing 15. The second bushing 14, the needle roller bearing 15, the cross shaft 16 and the planetary gear 17 form a fourth assembly.

[0077] Optionally, after step S004, the following step is further included: S005, installing the fourth assembly into the differential housing 13. The third assembly and the fourth assembly form a fifth assembly.

[0078] Optionally, before step S100, the following step is further included: S006, installing the third bushing 18 into the bushing mating hole of the cylindrical gear 19. The third bushing 18 and the cylindrical gear 19 form a sixth assembly.

[0079] Optionally, before step S100, the following step is further included: S007, installing the first inner ring 41 and the first roller assembly 43 on the outer periphery of the gear transmission shaft 3. The first inner ring 41, the first roller assembly 43 and the gear transmission shaft 3 form a seventh assembly.

[0080] Optionally, before step S100, the following step is further included: S008, sleeving the dust cover 7 on the outer periphery of the flange 6. The dust cover 7 and the flange 6 form an eighth assembly.

[0081] In this embodiment, the first component, the second component, the third component, the fourth component, the fifth component, the sixth component, the seventh component, and the eighth component are pre-assembled independently in advance, which can reduce the assembly stress, reduce the assembly error, and can be used as a backup to improve the assembly efficiency.

[0082] Optionally, before step S100, the following steps are further included:

[0083] S009. Sequentially install the second component, the second gasket 21, the fifth component, and the sixth component into the first component, and the second roller assembly 93 abuts against the second outer ring 91.

[0084] S010. Install the seventh component into the reduction housing 1.

[0085] S011. Sleeve the eighth component on the outer periphery of the gear transmission shaft 3, and make the dust cover 7 closely abut against the bearing seat 2.

[0086] After step S011, step S100 is carried out. In step S100, the fastening bolt is tightened with a torque of (160 - 180) N·m, and the bearing seat 2 and the reduction housing 1 are fixedly connected through the fastening bolt.

[0087] After step S011, the following is further included: step S012. Install the sealing ring into the groove between the flange 6 and the gear transmission shaft 3, and tighten the lock nut 20 with a torque of (650 - 750) N·m, and rivet and cut off the lock edge of the lock nut 20 for locking and loosening prevention. And when facing the lock nut 20 and the groove is above, the cut-off lock edge should be fitted with the left side surface of the groove.

[0088] In addition, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the inventive concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An assembly method for assembling a middle bridge inter-axle differential assembly, the middle bridge inter-axle differential assembly comprising: A reduction housing (1), wherein a bearing seat (2) is installed on the outer side of the reduction housing (1); A gear transmission shaft (3) passes through the reduction housing (1) and the bearing seat (2); a first roller bearing (4) is sleeved on the outer periphery of the first section of the gear transmission shaft (3) corresponding to the bearing seat (2); a first inner ring (41) of the first roller bearing (4) abuts against a first shoulder of the first section; an outer wall of a first outer ring (42) of the first roller bearing (4) abuts against an inner wall of the bearing seat (2); and a first gasket (5) is provided between an axial end surface of the first outer ring (42) and the bearing seat (2); The outer periphery of the first section is also sleeved with a flange (6), the flange (6) abuts against a side of the first inner ring (41) away from the first shaft shoulder, the outer periphery of the flange (6) is tightly sleeved with a dust cover (7), the dust cover (7) tightly abuts against the bearing seat (2) to seal the gap between the bearing seat (2) and the gear transmission shaft (3); Characterized in that the assembly method comprises the following steps: S100, pressing and installing the bearing seat (2) with the first gasket (5) and the first outer ring (42) on the reduction housing (1), and detecting the axial movement of the gear transmission shaft (3); if the axial movement exceeds a preset range, replacing the first gasket (5); if the axial movement is within the preset range, proceeding to the next step; S200, removing the bearing seat (2) on which the first gasket (5) and the first outer ring (42) are installed from the reduction housing (1), and pressing the oil seal (8) into the through hole of the bearing seat (2) at a uniform speed; S300, installing the bearing seat (2) equipped with the first gasket (5), the first outer ring (42) and the oil seal (8) on the reduction housing (1), and then sleeve the flange (6) equipped with the dust cover (7) on the outer periphery of the first section and make the flange (6) abut against the side of the first inner ring (41) away from the first shaft shoulder; Before step S100, the method further includes the following steps: S101, obtaining the first gasket (5) of a preset thickness, wherein step S101 specifically comprises: Measuring a distance L1 between a first flange surface (201) and a bottom surface (202) of the hole, wherein the first flange surface (201) is an end surface of the bearing seat (2) abutting against the reduction housing (1) along the axial direction, and the bottom surface (202) of the hole is an end surface of the bearing seat (2) abutting against the first gasket (5) along the axial direction; Insert the gear transmission shaft (3) sleeved with the first roller bearing (4) into the reduction housing (1), axially press against the first outer ring (42) with a preset pressure, so that the first outer ring (42) presses the first roller assembly (43) of the first roller bearing (4), and measure the distance L2 between the second flange surface (101) and the end face of the outer ring (421). The second flange surface (101) is the end face of the reduction housing (1) axially abutting against the first flange surface (201), and the end face of the outer ring (421) is the end face of the first outer ring (42) pressed by the preset pressure. Calculate the theoretical thickness value L of the first gasket (5), where L = L1 - L2 + H, and H = 0.06, and select the first gasket (5) with the actual thickness value L' according to the theoretical thickness value L. Here, L', L, L1, L2, and H are all in millimeters.

2. The assembly method according to claim 1, characterized in that, An oil seal (8) is also tightly sleeved on the outer periphery of the first section. The oil seal (8) is located on the side of the dust cover (7) facing the first roller bearing (4). The outer wall of the oil seal (8) is in close contact with the inner wall of the bearing seat (2). A dust-proof lip (81) is provided on the side of the oil seal (8) extending towards the dust cover (7), and the dust-proof lip (81) abuts against the dust cover (7).

3. The assembly method according to claim 1, characterized in that, Before evenly pressing the oil seal (8) into the through hole of the bearing seat (2), it also includes step: S201, clean the oil seal (8) and the through hole of the bearing seat (2), and apply grease to the oil seal (8).

4. The assembly method according to claim 1, characterized in that, Before the step S300, it also includes step: S301, apply sealant on the second flange surface (101).

5. The assembly method according to claim 1, characterized in that, Before the step S100, it also includes step: S001, insert the second outer ring (91) of the second roller bearing (9) into the bearing installation hole of the reduction housing (1). The second outer ring (91) and the reduction housing (1) form a first assembly.

6. The assembly method according to claim 5, characterized in that, Before the step S100 and after the step S001, it also includes step: S002, install the second inner ring (92) and the second roller assembly (93) of the second roller bearing (9) on the outer periphery of the rear bevel gear (10), and insert the first bushing (11) into the mating hole of the rear bevel gear (10). The second inner ring (92), the second roller assembly (93), the first bushing (11), and the rear bevel gear (10) form a second assembly.

7. The assembly method according to claim 6, characterized in that, Before the step S100 and after the step S002, it also includes step: S003, install the oil collecting cover (12) on the oil collecting mating surface of the differential housing (13). The oil collecting cover (12) and the differential housing (13) form a third assembly.

8. The assembly method according to claim 7, characterized in that, Before the step S100 and after the step S003, there is also a step: S004. Install the second bushing (14) and the needle bearing (15) in sequence on the outer periphery of the gear shaft of the cross shaft (16), and the needle bearing (15) is located on the side of the second bushing (14) away from the central axis of the cross shaft (16). Then install the planetary gear (17) on the outer periphery of the needle bearing (15). The second bushing (14), the needle bearing (15), the cross shaft (16) and the planetary gear (17) form the fourth assembly.

9. The assembly method according to claim 8, wherein, Before the step S100 and after the step S004, there is also a step: S005. Install the fourth assembly into the differential housing (13). The third assembly and the fourth assembly form the fifth assembly.

10. The assembly method according to claim 9, characterized in that Before the step S100 and after the step S005, there is also a step: S006. Install the third bushing (18) into the bushing fitting hole of the cylindrical gear (19). The third bushing (18) and the cylindrical gear (19) form the sixth assembly.

11. The assembly method according to claim 10, characterized in that, Before the step S100 and after the step S006, there is also a step: S007. Install the first inner ring (41) and the first roller assembly (43) on the outer periphery of the gear transmission shaft (3). The first inner ring (41), the first roller assembly (43) and the gear transmission shaft (3) form the seventh assembly.

12. The assembly method according to claim 11, characterized in that, Before the step S100 and after the step S007, there is also a step: S008. Sleeve the dust cover (7) on the outer periphery of the flange (6). The dust cover (7) and the flange (6) form the eighth assembly.

13. The assembly method according to claim 12, characterized in that Before the step S100 and after the step S008, there is also a step: S009. Install the second assembly, the second gasket (21), the fifth assembly and the sixth assembly into the first assembly in sequence. The second roller assembly (93) abuts against the second outer ring (91); S010. Install the seventh assembly into the reduction housing (1); S011. Sleeve the eighth assembly on the outer periphery of the gear transmission shaft (3), and make the dust cover (7) closely abut against the bearing seat (2).

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