Electric drive axle gear shaft structure

Abstract

The utility model discloses an electric drive bridge gear shaft structure relates to gear technical field, electric drive bridge gear shaft structure, include: gear shaft, gear shaft axial first shoulder and second shoulder are equipped with, first bearing inner ring and gear shaft interference fit, and first bearing outer ring is located in first bearing hole, first baffle ring is fixed in gear shaft, second baffle ring is fixed in first bearing hole, and first bearing inner ring axial both sides are limited through first baffle ring and first shoulder, and first bearing outer ring axial both sides are limited through first bearing hole and second baffle ring, second bearing inner ring and gear shaft interference fit, and second bearing outer ring is located in second bearing hole, third baffle ring is fixed in second bearing hole, and fixing piece is fixed in gear shaft, and second bearing inner ring axial both sides are limited through second shoulder and fixing piece, and second bearing outer ring axial both sides are limited through second bearing hole and third baffle ring. Therefore, through both sides bearing all full fixed form promotion bearing service life.

Description

Technical Field

[0001] This utility model relates to the field of gear technology, and more specifically, to an electric drive bridge gear shaft structure. Background Technology

[0002] In electric drive systems, the gear shaft is directly connected to the motor. Due to its high speed and large torque, the primary meshing gear is also a high-speed gear transmission pair. Furthermore, to meet requirements for noise, vibration, and acoustic roughness, a large helix angle is often required. This factor generates a large axial load, thus placing stringent demands on the performance of the gear shaft bearings.

[0003] In related technologies, the bearings of the gear shaft are deep groove ball bearings. Specifically, one side of the deep groove ball bearing is fully fixed, while the other side is limited by a single side. In this case, the fully fixed bearing bears axial force under both driving and energy recovery conditions, while the single-sided limited bearing bears axial force only under one condition. The two bearings bear different loads, which affects the service life of the bearings.

[0004] In conclusion, how to improve the service life of the bearings on both sides of the gear shaft is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an electric drive bridge gear shaft structure, in which the first and second bearings on both sides of the gear shaft are fixed in a fully fixed manner, so as to improve the service life of the bearings.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An electric drive bridge gear shaft structure, comprising:

[0008] A gear shaft, wherein the gear shaft is provided with a first shoulder and a second shoulder in its axial direction;

[0009] The first bearing assembly includes a first bearing and a first end cap. The inner ring of the first bearing is interference-fitted with the gear shaft, and the outer ring of the first bearing is disposed in the first bearing hole of the first end cap.

[0010] The first fixing component includes a first retaining ring and a second retaining ring located on both axial sides of the first bearing. The first retaining ring is fixed to the gear shaft, and the second retaining ring is fixed to the first bearing hole. The axial sides of the inner ring of the first bearing are limited by the first retaining ring and the first shaft shoulder, and the axial sides of the outer ring of the first bearing are limited by the first bearing hole and the second retaining ring.

[0011] The second bearing assembly includes a second bearing and a second end cap. The inner ring of the second bearing is interference-fitted with the gear shaft, and the outer ring of the second bearing is disposed in the second bearing hole of the second end cap.

[0012] The second fixing component includes a third retaining ring and a fixing member located on both axial sides of the second bearing. The third retaining ring is fixed to the second bearing hole, and the fixing member is fixed to the gear shaft. The axial sides of the inner ring of the second bearing are limited by the second shaft shoulder and the fixing member, and the axial sides of the outer ring of the second bearing are limited by the second bearing hole and the third retaining ring.

[0013] Preferably, the fixing component includes adjusting shims and locking nuts located on both axial sides of the inner ring of the second bearing, the locking nuts being threadedly connected to the gear shaft, and the adjusting shims being installed on the second shaft shoulder and used to adjust the preload and clearance of the second bearing.

[0014] Preferably, the distance between the hole wall A of the first bearing hole and the hole wall B of the second bearing hole is L1, the sum of the width of the first bearing and the width of the second bearing is W, and the distance between the first shoulder and the second shoulder is L2. Then the thickness of the adjusting shim is T = L1 - L2 - W.

[0015] Preferably, the gear shaft has a threaded shaft section that is threadedly connected to the locking nut, and the length of the threaded shaft section is equal to the length of the inner thread section of the locking nut.

[0016] Preferably, the threaded shaft section has at least one first cutting groove in its circumferential direction, and the inner ring of the locking nut has at least one second cutting groove in its circumferential direction. The first cutting groove and the second cutting groove opposite to it can form an anti-loosening space. A coiled pin is installed in the anti-loosening space, and the coiled pin is locked in the anti-loosening space to achieve the anti-loosening of the locking nut.

[0017] Preferably, the fastener includes a fourth retaining ring, a first washer, and a second washer. The fourth retaining ring and the first washer are located on the same side of the axial direction of the second bearing, and the first washer is located on the other side of the axial direction of the second bearing and is mounted on the second shoulder. The first washer and the second washer are used to adjust the preload and clearance of the second bearing.

[0018] Preferably, the distance between the hole wall A of the first bearing hole and the hole wall B of the second bearing hole is L1, the sum of the width of the first bearing and the width of the second bearing is W, and the distance between the first shoulder and the second shoulder is L2. Then, the sum of the thicknesses of the first shim and the second shim is t = L1 - L2 - W.

[0019] Preferably, the gear shaft is provided with a first retaining ring groove, and the first retaining ring engages with the first retaining ring groove;

[0020] The inner wall of the first bearing hole is provided with a second retaining ring groove, the second retaining ring is engaged with the second retaining ring groove, and the second retaining ring is collinear with the edge of the first bearing and the vertical step surface of the first shoulder.

[0021] Preferably, the inner wall of the second bearing hole is provided with a third retaining ring groove, and the third retaining ring is engaged with the third retaining ring groove.

[0022] Preferably, the second end cover is further provided with an oil seal mechanism, the inner ring of which is sleeved on the gear shaft.

[0023] The electric drive bridge gear shaft structure provided by this utility model includes a gear shaft, a first bearing assembly, a first fixing assembly, a second bearing assembly, and a second fixing assembly. The first bearing assembly includes a first bearing and a first end cap. The inner ring of the first bearing is interference-fitted with the gear shaft, and the outer ring of the first bearing is disposed in the first bearing hole of the first end cap. The wall of the first bearing hole and the edge of the second retaining ring are respectively attached to both sides of the outer ring of the first bearing to reliably fix the outer ring of the first bearing. The edge of the first retaining ring and the stepped surface of the first shaft shoulder are respectively attached to both sides of the inner ring of the first bearing to reliably fix the inner ring of the first bearing. The second bearing assembly includes a second bearing and a second end cap. The inner ring of the second bearing is interference-fitted with the gear shaft, and the outer ring of the second bearing is disposed in the second bearing hole of the second end cap. The stepped surface of the second shaft shoulder and the edge of the fixing member are respectively attached to both sides of the inner ring of the second bearing to reliably fix the inner ring of the second bearing. The wall of the second bearing hole and the edge of the third retaining ring are respectively attached to both sides of the outer ring of the second bearing to reliably fix the outer ring of the second bearing. By setting the first fixing component and the second fixing component, the first bearing and the second bearing can be reliably fixed relative to the gear shaft, so that both the first bearing and the second bearing can bear the axial force generated by the gear shaft.

[0024] The beneficial effects of this utility model are as follows: both the first bearing and the second bearing adopt a fully fixed fixing form. Regardless of whether it is in forward drive or energy recovery operation, the axial force generated by the gear shaft is shared by the first bearing and the second bearing, which greatly improves the service life of the bearing. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the electric drive bridge gear shaft structure provided by this utility model.

[0027] Figure 2 This is a side view of the electric drive bridge gear shaft structure provided by this utility model;

[0028] Figure 3 An exploded view of the electric drive bridge gear shaft structure provided by this utility model;

[0029] Figure 4 This is a half-sectional view of the electric drive bridge gear shaft structure provided by this utility model.

[0030] Figure 5 This is a schematic diagram showing the force direction of the electric drive axle gear shaft structure provided by this utility model under forward drive conditions.

[0031] Figure 6 This is a schematic diagram showing the force direction under energy recovery conditions provided by this utility model.

[0032] Figures 1-6 In the accompanying drawings, the reference numerals include:

[0033] 1-First retaining ring; 2-First bearing; 3-First end cover; 4-Second retaining ring; 5-Gear shaft; 6-Adjusting shim; 7-Third retaining ring; 8-Second bearing; 9-Second end cover; 10-Locking nut; 11-Oil seal mechanism; 12-Coiled pin; 13-First shoulder; 14-Second shoulder;

[0034] 51 - Threaded shaft section; 511 - First cutting groove; 101 - Second cutting groove. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] The core of this utility model is to provide an electric drive bridge gear shaft 5 structure. Regardless of whether it is in forward drive or energy recovery mode, the axial force generated by the gear shaft 5 is shared by the first bearing 2 and the second bearing 8, which greatly improves the service life of the bearing.

[0037] The electric drive bridge gear shaft 5 structure provided by this utility model includes a gear shaft 5, a first bearing assembly, a first fixing assembly, a second bearing assembly, and a second fixing assembly, as shown below. Figure 1 , Figure 2 , Figure 3 , Figure 4 .

[0038] The gear shaft 5 has a first shoulder 13 and a second shoulder 14 along its axial direction. The first shoulder 13 and the second shoulder 14 have the same structural form. Specifically, the structural form and position are determined according to the installation requirements of the first bearing assembly and the second bearing assembly.

[0039] The first bearing assembly includes a first bearing 2 and a first end cover 3. The inner ring of the first bearing 2 is interference-fitted with the gear shaft 5, and the outer ring of the first bearing 2 is disposed in the first bearing hole of the first end cover 3. The first bearing 2 is reliably mounted on the gear shaft 5 by means of interference fit.

[0040] The first fixing component includes a first retaining ring 1 and a second retaining ring 4 located on both axial sides of the first bearing 2. The first retaining ring 1 is fixed to the gear shaft 5, and the second retaining ring 4 is fixed to the first bearing hole. The axial sides of the inner ring of the first bearing 2 are limited by the first retaining ring 1 and the first shaft shoulder 13. The limitation is actually achieved by the edge of the first retaining ring 1 and the stepped surface of the first shaft shoulder 13 respectively fitting against both sides of the inner ring of the first bearing 2 to reliably fix the inner ring of the first bearing 2.

[0041] The outer ring of the first bearing 2 is axially limited on both sides by the first bearing hole and the second retaining ring 4. The limiting here is actually achieved by the first bearing hole wall and the edge of the second retaining ring 4 respectively fitting against both sides of the outer ring of the first bearing 2 to reliably fix the outer ring of the first bearing 2.

[0042] By setting the first fixing component, the first bearing 2 can be reliably fixed relative to the gear shaft 5 in a fully fixed manner.

[0043] The second bearing assembly includes a second bearing 8 and a second end cover 9. The inner ring of the second bearing 8 is interference-fitted with the gear shaft 5, and the outer ring of the second bearing 8 is disposed in the second bearing hole of the second end cover 9. The second bearing 8 is reliably mounted on the gear shaft 5 by means of interference fit.

[0044] The second fixing assembly includes a third retaining ring 7 and a fixing member located on both axial sides of the second bearing 8. The third retaining ring 7 is fixed to the second bearing hole, and the fixing member is fixed to the gear shaft 5. The axial sides of the inner ring of the second bearing 8 are limited by the second shaft shoulder 14 and the fixing member. The limiting here is actually achieved by the stepped surface of the second shaft shoulder 14 and the edge of the fixing member respectively fitting against both sides of the inner ring of the second bearing 8 so as to reliably fix the inner ring of the second bearing 8.

[0045] The outer ring of the second bearing 8 is axially limited on both sides by the second bearing hole and the third retaining ring 7. The limiting here is actually achieved by the second bearing hole wall and the edge of the third retaining ring 7 respectively fitting against both sides of the outer ring of the second bearing 8 to reliably fix the outer ring of the second bearing 8.

[0046] By setting the second fixing component, the second bearing 8 can be reliably fixed relative to the gear shaft 5 in a fully fixed manner.

[0047] In actual use, since both the first bearing 2 and the second bearing 8 are fully fixed, the axial force generated by the gear shaft 5 is shared by the first bearing 2 and the second bearing 8 under both forward drive and energy recovery conditions, greatly improving the service life of the bearings. With the axial force shared by the two bearings, fatigue damage to individual bearings is minimal, thus allowing for the selection of smaller high-speed bearings while still meeting service life requirements. Furthermore, under alternating operating conditions, the robustness of the first bearing 2 and the second bearing 8 corresponding to the gear shaft 5 is improved; robustness here refers to the bearing's ability to maintain stable operation and normal function.

[0048] Based on any of the above embodiments, please refer to the figure. The fastener includes adjusting shims 6 and locking nuts 10 located on both axial sides of the inner ring of the second bearing 8. The locking nuts 10 are threadedly connected to the gear shaft 5. The adjusting shims 6 are installed on the second shaft shoulder 14 and are used to adjust the preload and clearance of the second bearing 8.

[0049] The adjusting shim 6 is installed on the second shaft shoulder 14. Specifically, one side of the adjusting shim 6 axially aligns with the stepped surface of the second shaft shoulder 14, and the other side aligns with the inner ring end face of the second bearing 8. The locking nut 10 is threadedly connected to the gear shaft 5. With the adjusting shim 6 installed on the second shaft shoulder 14, and in conjunction with the locking nut 10 relative to the gear shaft 5, the inner ring of the second bearing 8 is reliably limited and fixed.

[0050] Furthermore, the preload and clearance of the second bearing 8 can be adjusted by adjusting the shim 6. Specifically, the preload and radial clearance between the inner and outer rings of the second bearing 8 can be adjusted to prevent abnormal bearing failure.

[0051] Specifically, after knowing the relevant dimensions of the first end cap 3, the second end cap 9, and the gear shaft 5, the preload and clearance are adjusted by controlling the dimensional chain through adjusting the thickness of the shim 6.

[0052] In one specific embodiment, the distance between the hole wall A of the first bearing hole and the hole wall B of the second bearing hole is L1, the sum of the widths of the first bearing 2 and the second bearing 8 is W, and the distance between the first shoulder 13 and the second shoulder 14 is L2. Then, the thickness T of the adjusting shim 6 is T = L1 - L2 - W. The thickness of the adjusting shim 6 is determined through this dimensional chain calculation method to identify a suitable adjusting shim 6. Through this method, the preload and clearance of the bearing can be adjusted by controlling the dimensional chain using the adjusting shim 6. Furthermore, by controlling the dimensional chain, the load distribution relationship between the first bearing 2 and the second bearing 8 can be adjusted, making the service life of the first bearing 2 and the second bearing 8 less different.

[0053] Based on any of the above embodiments, please refer to Figure 3 , Figure 4 , Figure 5 The gear shaft 5 is provided with a threaded shaft section 51 that is threadedly connected to the locking nut 10. The length of the threaded shaft section 51 is equal to the length of the inner ring thread section of the locking nut 10.

[0054] After the adjusting shim 6 is determined, the locking rear end face of the locking nut 10 is completely in contact with the inner ring end face of the second bearing 8. Then the corresponding locking nut 10 is completely tightened on the threaded shaft section 51, and the lengths of the threaded shaft section 51 and the inner ring threaded section are consistent, so that the locking nut 10 can be reliably and accurately installed relative to the gear shaft 5, ensuring a reliable fixing effect on the second bearing 8.

[0055] In this embodiment, in order to ensure the working effect of the locking nut 10, an anti-loosening component, such as an anti-loosening pin, can be connected between the locking nut 10 and the threaded shaft section 51 to ensure that the locking nut 10 will not loosen after being locked.

[0056] Based on any of the above embodiments, please refer to Figure 3 , Figure 4 The threaded shaft section 51 has at least one first cutting groove 511 in the circumferential direction, and the inner ring of the locking nut 10 has at least one second cutting groove 101 in the circumferential direction. The first cutting groove 511 and the second cutting groove 101 opposite to it can form an anti-loosening space. A coiled pin 12 is installed in the anti-loosening space and is locked in the anti-loosening space to achieve the anti-loosening of the locking nut 10.

[0057] In this embodiment, the circumferential direction refers to the outer circumferential direction of the circular component, such as the locking nut 10 or the threaded shaft segment 51 of the gear shaft 5.

[0058] The first cutting groove 511 and the second cutting groove 101 are actually groove structures formed by cutting. The first cutting groove 511 and the second cutting groove 101 opposite it are actually used to lock the lock nut 10 after it is installed in place relative to the threaded shaft section 51. The first cutting groove 511 and the second cutting groove 101 opposite it are used to place a coiled pin 12 in the anti-loosening space formed by the first cutting groove 511 and the second cutting groove 101, so that the lock nut 10 can be locked after it is installed in place, preventing the lock nut 10 from loosening, that is, ensuring the fixing effect of the second bearing 8.

[0059] Based on any of the above embodiments, the fastener includes a fourth retaining ring, a first washer, and a second washer. The fourth retaining ring and the first washer are located on the same side of the axial direction of the second bearing 8, and the first washer is located on the other side of the axial direction of the second bearing 8 and is mounted on the second shoulder 14. The first washer and the second washer are used to adjust the preload and clearance of the second bearing 8.

[0060] The first shim is installed on the second shoulder 14, specifically, one axial side of the first shim is in contact with the stepped surface of the second shoulder 14, and the other side is in contact with the end face of the inner ring of the second bearing 8; one axial side of the second shim is in contact with the other end face of the inner ring of the second bearing 8, and the other side is in contact with the fourth retaining ring, which is engaged with the gear shaft 5 for fixation. Thus, the reliable positioning and fixation of the inner ring of the second bearing 8 can be achieved through the arrangement of the first shim, the second shim, and the fourth retaining ring.

[0061] Furthermore, the preload and clearance of the second bearing 8 can be adjusted by using the first and second shims. Specifically, the preload and radial clearance between the inner and outer rings of the second bearing 8 can be adjusted to prevent abnormal bearing failure.

[0062] Specifically, after knowing the relevant dimensions of the first end cap 3, the second end cap 9, and the gear shaft 5, the preload and clearance are adjusted by controlling the dimensional chain through the thickness of the first shim and the second shim.

[0063] In one specific embodiment, the distance between the hole wall A of the first bearing hole and the hole wall B of the second bearing hole is L1, the sum of the widths of the first bearing 2 and the second bearing 8 is W, and the distance between the first shoulder 13 and the second shoulder 14 is L2. Therefore, the sum of the thicknesses of the first shim and the second shim is t = L1 - L2 - W. The thickness of the adjusting shim 6 is determined through this dimensional chain calculation method to determine suitable first and second shims. Through this method, the preload and clearance of the bearing can be adjusted by controlling the dimensional chain using the first and second shims. Furthermore, by controlling the dimensional chain, the load distribution relationship borne by the first bearing 2 and the second bearing 8 can be adjusted, making the service life of the first bearing 2 and the second bearing 8 less different.

[0064] Based on any of the above embodiments, the gear shaft 5 is provided with a first snap ring groove, and the first retaining ring 1 is engaged with the first snap ring groove;

[0065] The inner wall of the first bearing hole is provided with a second retaining ring groove, the second retaining ring 4 is engaged with the second retaining ring groove, and the second retaining ring 4 is collinear with the edge of the first bearing 2 and the vertical step surface of the first shoulder 13.

[0066] like Figure 3 As shown, the structure of the first retaining ring groove and the second retaining ring groove is actually in the form of a groove, which can provide reliable limiting and fixing of the first retaining ring 1 and the second retaining ring 4, so as to ensure the full fixing effect of the first bearing 2.

[0067] The second retaining ring 4, in conjunction with the first bearing hole, limits and fixes the outer ring of the first bearing 2. Therefore, the second retaining ring 4 is close to the edge of the first bearing 2 and collinear with the vertical step surface of the first shoulder 13. The edge of the second retaining ring 4 is directly attached to the outer ring of the first bearing 2, while the vertical step surface of the first shoulder 13 is attached to the inner ring of the first bearing 2, ensuring the reliable fixation of the first bearing 2.

[0068] Based on any of the above embodiments, the inner wall of the second bearing hole is provided with a third retaining ring groove, and the third retaining ring 7 is engaged with the third retaining ring groove. The third retaining ring 7 has the same structure as the second retaining ring 4, and the third retaining ring groove corresponds to the second retaining ring groove. By engaging the third retaining ring 7 in the second bearing hole, it can cooperate with the inner wall of the second bearing hole to provide reliable fixing and limiting of the second bearing 8.

[0069] Based on any of the above embodiments, please refer to Figure 3 , Figure 4 The second end cover 9 is also equipped with an oil seal mechanism 11, the inner ring of which is fitted onto the gear shaft 5. As shown in the figure, the oil seal mechanism 11 is set away from the threaded shaft section 51, so as not to interfere with the normal locking operation of the locking nut 10. The oil seal mechanism 11 prevents lubricating oil leakage and foreign matter intrusion, thus ensuring the normal and reliable operation of the bearing.

[0070] The assembly sequence of the electric drive bridge gear shaft 5 structure provided by this utility model will be described next:

[0071] The first bearing 2 is installed onto the gear shaft 5 with an interference fit, and the first retaining ring 1 is installed into the first snap ring groove on the gear shaft 5. At this time, the inner ring of the first bearing 2 is completely fixed to the gear shaft 5. The assembly consisting of the gear shaft 5, the first bearing 2, and the first retaining ring 1 is installed into the first bearing hole of the first end cover 3, and the second retaining ring 4 is installed into the second snap ring groove of the first end cover 3. At this time, the outer ring of the first bearing 2 is completely fixed to the first end cover 3.

[0072] The second bearing 8 is installed into the second bearing hole of the second end cover 9, and the third retaining ring 7 is installed into the third retaining ring groove of the second end cover 9. At this time, the outer ring of the second bearing 8 is completely fixed to the second end cover 9. Measure the distance L1 between the hole wall A of the first bearing hole and the hole wall B of the second bearing hole, and measure the distance L2 between the first shoulder 13 and the second shoulder 14 of the gear shaft 5. Calculate the appropriate adjusting shim 6 using the dimensional chain.

[0073] Adjust the shim 6 onto the corresponding shaft section of the gear shaft 5, install the assembly consisting of the third retaining ring 7, the second bearing 8, and the second end cover 9 onto the gear shaft 5, and use a tooling sleeve to penetrate along the oil seal hole of the second end cover 9 and press the inner ring of the second bearing 8. Install the lock nut 10 along the oil seal hole onto the threaded shaft section 51 of the gear shaft 5 and tighten the lock nut 10 until the first cutting groove 511 on the gear shaft 5 corresponds to the second cutting groove 101 of the lock nut 10. Insert the coiled pin 12 into the anti-loosening space formed by the first cutting groove 511 and the second cutting groove 101 to prevent the lock nut 10 from loosening. Finally, install the oil seal mechanism 11 onto the gear shaft 5.

[0074] like Figure 5 As shown, in forward drive mode, due to the gear helix angle, the axial force generated by the gear shaft 5 is to the left, and the counteracting force of the first end cover 3 acts to the right on the outer ring of the first bearing 2. The force is transmitted to the inner ring of the first bearing 2 and then to the first shoulder 13 of the gear shaft 5. At the same time, the counteracting force of the second end cover 9 is transmitted to the third retaining ring 7 and acts on the outer ring of the second bearing 8. The force is transmitted from the outer ring of the second bearing 8 to the inner ring of the bearing and finally acts on the locking nut 10. The locking nut 10 is connected to the gear shaft 5 by threads, so the counteracting forces of the first bearing 2 and the second bearing 8 are finally applied to the gear shaft 5.

[0075] like Figure 6 As shown, during energy recovery operation, the axial force generated by the gear shaft 5 is directed to the right, and the counteracting force of the first end cover 3 acts to the left on the second retaining ring 4 and then on the outer ring of the first bearing 2. The force is transmitted from the outer ring of the first bearing 2 to the inner ring of the bearing and finally acts on the first retaining ring 1. Since the first retaining ring 1 is installed in the first snap ring groove of the gear shaft 5, the counteracting force acts on the gear shaft 5. At the same time, the counteracting force of the second end cover 9 is transmitted to the outer ring of the second bearing 8. The force is transmitted from the outer ring of the second bearing 8 to the inner ring of the bearing and finally acts on the adjusting shim 6 and then on the second shoulder 14 of the gear shaft 5. Therefore, the counteracting forces of the first bearing 2 and the second bearing 8 both ultimately act on the gear shaft 5.

[0076] As can be seen from the above, regardless of whether it is in forward drive or energy recovery mode, the axial force generated by gear shaft 5 is distributed by the two bearings, which greatly improves the service life of the two bearings.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0078] The above provides a detailed description of the electric drive bridge gear shaft structure provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An electric drive bridge gear shaft structure, characterized in that, include: Gear shaft (5), the gear shaft (5) is provided with a first shoulder (13) and a second shoulder (14) in the axial direction; The first bearing assembly includes a first bearing (2) and a first end cover (3). The inner ring of the first bearing (2) and the gear shaft (5) are interference-fitted. The outer ring of the first bearing (2) is disposed in the first bearing hole of the first end cover (3). The first fixing component includes a first retaining ring (1) and a second retaining ring (4) located on both axial sides of the first bearing (2). The first retaining ring (1) is fixed to the gear shaft (5), and the second retaining ring (4) is fixed to the first bearing hole. The axial sides of the inner ring of the first bearing (2) are limited by the first retaining ring (1) and the first shaft shoulder (13), and the axial sides of the outer ring of the first bearing (2) are limited by the first bearing hole and the second retaining ring (4). The second bearing assembly includes a second bearing (8) and a second end cap (9). The inner ring of the second bearing (8) is interference-fitted with the gear shaft (5), and the outer ring of the second bearing (8) is disposed in the second bearing hole of the second end cap (9). The second fixing component includes a third retaining ring (7) and a fixing member located on both axial sides of the second bearing (8). The third retaining ring (7) is fixed to the second bearing hole, and the fixing member is fixed to the gear shaft (5). The axial sides of the inner ring of the second bearing (8) are limited by the second shaft shoulder (14) and the fixing member, and the axial sides of the outer ring of the second bearing (8) are limited by the second bearing hole and the third retaining ring (7).

2. The electric drive bridge gear shaft structure according to claim 1, characterized in that, The fastener includes an adjusting shim (6) and a locking nut (10) located on both sides of the inner ring of the second bearing (8). The locking nut (10) is threadedly connected to the gear shaft (5). The adjusting shim (6) is installed on the second shaft shoulder (14) and is used to adjust the preload and clearance of the second bearing (8).

3. The electric drive bridge gear shaft structure according to claim 2, characterized in that, The distance between the hole wall A of the first bearing hole and the hole wall B of the second bearing hole is L1, the sum of the width of the first bearing (2) and the width of the second bearing (8) is W, and the distance between the first shoulder (13) and the second shoulder (14) is L2. Then the thickness T of the adjusting shim (6) is T=L1-L2-W.

4. The electric drive bridge gear shaft structure according to claim 3, characterized in that, The gear shaft (5) is provided with a threaded shaft section (51) that is threadedly connected to the locking nut (10). The length of the threaded shaft section (51) is equal to the length of the inner ring thread section of the locking nut (10).

5. The electric drive bridge gear shaft structure according to claim 4, characterized in that, The threaded shaft section (51) is provided with at least one first cutting groove (511) in the circumferential direction, and the inner ring of the locking nut (10) is provided with at least one second cutting groove (101) in the circumferential direction. The first cutting groove (511) and the second cutting groove (101) opposite to it can form an anti-loosening space. A coiled pin (12) is installed in the anti-loosening space. The coiled pin (12) is locked in the anti-loosening space to realize the anti-loosening of the locking nut (10).

6. The electric drive bridge gear shaft structure according to claim 1, characterized in that, The fastener includes a fourth retaining ring, a first washer, and a second washer. The fourth retaining ring and the first washer are located on the same side of the axial direction of the second bearing (8), and the first washer is located on the other side of the axial direction of the second bearing (8) and is mounted on the second shoulder (14). The first washer and the second washer are used to adjust the preload and clearance of the second bearing (8).

7. The electric drive bridge gear shaft structure according to claim 6, characterized in that, The distance between the hole wall A of the first bearing hole and the hole wall B of the second bearing hole is L1, the sum of the width of the first bearing (2) and the width of the second bearing (8) is W, and the distance between the first shoulder (13) and the second shoulder (14) is L2. Then the sum of the thicknesses of the first shim and the second shim is t = L1 - L2 - W.

8. The electric drive bridge gear shaft structure according to claim 5 or 7, characterized in that, The gear shaft (5) is provided with a first retaining ring groove, and the first retaining ring (1) is engaged with the first retaining ring groove; The inner wall of the first bearing hole is provided with a second retaining ring groove, the second retaining ring (4) is engaged with the second retaining ring groove, and the second retaining ring (4) is collinear with the edge of the first bearing (2) and the vertical step surface of the first shoulder (13).

9. The electric drive bridge gear shaft structure according to claim 8, characterized in that, The inner wall of the second bearing hole is provided with a third retaining ring groove, and the third retaining ring (7) is engaged with the third retaining ring groove.

10. The electric drive bridge gear shaft structure according to claim 9, characterized in that, The second end cover (9) is also provided with an oil seal mechanism (11), the inner ring of which is fitted onto the gear shaft (5).

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