A reducer assembly and a reducer housing assembly

Abstract

The present invention relates to a reducer assembly and a reducer housing component, wherein the reducer housing component includes a housing of an integrated structure; the housing includes two mounting parts, the two mounting parts are respectively provided with mounting holes for mounting intermediate shaft bearings, the two mounting holes are coaxial, and an installation space for mounting the intermediate shaft system is formed between the two mounting parts, at least one mounting part is provided with a mounting opening connected to the installation space on one side facing the differential, the width of the mounting opening is not less than the diameter of the intermediate shaft, and the intermediate shaft can enter the installation space through the mounting opening. The coaxiality of the intermediate shaft system after installation can be ensured, and the disassembly and assembly operations can be simplified, and the NVH performance of the reducer assembly can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a reducer assembly and a reducer housing component. Background Art

[0002] The electric drive axle is mainly composed of three parts: the reducer assembly, the bridge housing, and the half-axle. The reducer assembly plays the role of reducing speed and increasing torque, and is a key component of the electric drive axle. At present, there are two common reducer assembly structures on the market. One is the integral Y-mouth structure, in which the reducer housing is an integral structure. Since the mounting hole for installing the intermediate shaft and the housing are an integrated structure, the coaxiality of the left and right holes is good; the other is the shell cover structure, in which the reducer housing is similar to the shell structure. The housing is divided into two parts, the left and right housings, which are connected and assembled by bolts. Although it is easy to install, the coaxiality of the holes is poorer than that of the overall structure. In addition, since the housing is divided into two parts, the connection area between the left and right housings is large, and there is a risk of oil leakage after assembly.

[0003] However, when assembling the reducer housing with an integral structure, each shaft system (input shaft, intermediate shaft and output shaft) can only be press-fitted separately, especially the intermediate shaft. Since the size of the primary driven gear is large, the primary driven gear needs to be placed into the housing from the side facing the differential before the secondary driving gear and the intermediate shaft are press-fitted into the housing from the side along its axial direction. After pressing, the coaxiality of the entire shaft system is difficult to control, which affects the NVH performance (Noise, Vibration and Harshness, which refers to various indicators such as automobile noise, vibration and comfort) of the reducer assembly. In addition, the intermediate shaft system cannot be taken out as a whole, and rework requires taking out each part of the intermediate shaft system one by one, which brings difficulties to rework.

[0004] Therefore, how to ensure the coaxiality of the intermediate shaft system after installation, simplify the disassembly and assembly operations, and ensure the NVH performance of the reducer assembly is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a reducer assembly and a reducer housing assembly, which can ensure the coaxiality of the intermediate shaft system after installation, simplify the disassembly and assembly operations, and ensure the NVH performance of the reducer assembly.

[0006] In order to solve the above technical problems, the present invention provides a reducer housing assembly, which includes a housing of an integrated structure; the housing includes two mounting parts, the two mounting parts are respectively provided with mounting holes for installing intermediate shaft bearings, the two mounting holes are coaxial, and an installation space for installing the intermediate shaft system is formed between the two mounting parts, at least one of the mounting parts is provided with a mounting opening connected to the mounting space on the side facing the differential, the width of the mounting opening is not less than the diameter of the intermediate shaft, and the intermediate shaft can enter the mounting space through the mounting opening.

[0007] Before installation, the primary driven gear and the secondary driving gear can be first fixed to the intermediate shaft to form an intermediate shaft system, and then the installed intermediate shaft system can be installed as a whole in the installation space through the installation opening. Compared with the prior art, in which the primary driven gear is installed in the installation space from the side facing the differential, and then the intermediate shaft is installed in the installation space from the side end along its axial direction and press-fitted with the primary driven gear, the installation operation can be simplified, and when disassembling, the intermediate shaft can be removed from the installation opening together with the gear installed on the intermediate shaft, which is convenient for disassembly and assembly, and can effectively improve the disassembly and assembly efficiency, and is convenient for installation and maintenance.

[0008] At the same time, since the overall shaft system has been assembled before installation and the relative position is stable, the coaxiality and roundness of the intermediate shaft system can be guaranteed after installation, thereby improving the NVH performance of the reducer assembly. In addition, the first-stage driven gear and the second-stage driving gear can be ground and processed as a whole after being installed with the intermediate shaft, which can ensure the tooth surface accuracy of the gear itself, make the gear itself better, and further optimize the NVH performance.

[0009] In addition, since the shell is an integral structure and can be formed through one-piece processing, the coaxiality of the mounting holes of the two mounting parts is relatively high, and the shell of the integral structure is similar to a Y-shaped structure, which can be matched with different bridge shell structures and is suitable for different wheelbases and vehicle installation positions of different models, and has good scalability.

[0010] Optionally, it also includes a mounting cover, which can be detachably connected to the mounting portion provided with the mounting opening, and the mounting cover is provided with a mounting surface adapted to the mounting opening, and the mounting surface can cooperate with the intermediate shaft bearing from the mounting opening.

[0011] Optionally, each of the mounting portions is provided with a mounting opening, and a width of the mounting opening is not less than an outer diameter of the intermediate shaft bearing.

[0012] Optionally, the mounting cover is provided with two mounting ears, the two mounting ears are respectively located on both sides of the mounting surface in the length direction, and the mounting ears are connected to the mounting portion through a first bolt.

[0013] Optionally, a yielding structure is further provided on the side away from the mounting surface.

[0014] Optionally, a positioning structure is further provided between the mounting portion and the mounting cover.

[0015] Optionally, the width of the mounting opening is smaller than the outer diameter of the intermediate shaft bearing.

[0016] Optionally, two mounting seats are further included, which are used to install the output shaft bearing; at least one of the mounting seats is a split structure, and the mounting seat of the split structure includes a first seat body and a second seat body, the first seat body is fixed to the shell and is provided with a first mounting groove, the second seat body is detachably connected to the first seat body and is provided with a second mounting groove, and when the first seat body and the second seat body are fixed, the inner wall surface of the first mounting groove can be enclosed with the inner wall surface of the second mounting groove to form a mating surface that is compatible with the output shaft bearing along the circumferential direction.

[0017] Optionally, both of the two mounting seats are split structures, and each of the first seat bodies is integrally formed with the shell.

[0018] The present invention also provides a reducer assembly, which includes an intermediate shaft system and the reducer housing component as described above, wherein the intermediate shaft system includes an intermediate shaft, a primary driven gear and a secondary driving gear, and the primary driven gear and the secondary driving gear are interference-fitted outside the intermediate shaft.

[0019] The technical effect of the reducer assembly having the reducer housing assembly as described above is similar to the technical effect of the reducer housing assembly described above, and will not be described in detail here to save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the reducer housing assembly and the intermediate shaft system provided by an embodiment of the present invention in an installed state;

[0021] Figure 2 yes Figure 1 A cross-sectional view of

[0022] Figure 3 It is a schematic diagram of the structure of the shell;

[0023] Figure 4 yes Figure 3 A cross-sectional view of

[0024] Figure 5 is a schematic diagram of the structure of the installation cover;

[0025] Figure 6 A schematic diagram of the structure of the housing when no mounting cover is provided;

[0026] Figure 7 It is a schematic diagram of the structure of the intermediate shaft system;

[0027] Figure 8 It is a schematic diagram of the structure of the reducer housing assembly when only one mounting portion is provided with a mounting opening.

[0028] Attached Figure 1-8 In the figure, the reference numerals are described as follows:

[0029] 1- housing;

[0030] 2-mounting portion, 21-mounting hole;

[0031] 3- Installation space;

[0032] 4-mounting cover, 41-mounting ear, 42-yielding structure;

[0033] 5- first bolt;

[0034] 6-mounting seat, 61-first seat body, 62-second seat body, 63-second bolt;

[0035] 7-intermediate shaft system, 71-intermediate shaft, 72-first-stage driven gear, 73-second-stage driving gear;

[0036] 8-input shaft system, 81-input shaft, 82-first-stage driving gear;

[0037] 91-intermediate shaft, 92-input shaft bearing. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] An embodiment of the present invention provides a reducer assembly and a reducer housing assembly, wherein the reducer assembly includes a reducer housing assembly and an input shaft system 8, an intermediate shaft system 7 and an output shaft system, wherein the input shaft system 8 includes an input shaft 81 and a primary driving gear 82 arranged on the input shaft 81, the intermediate shaft system 7 includes an intermediate shaft 71 and a primary driven gear 72 and a secondary driving gear 73 arranged on the intermediate shaft 71, and the output shaft system includes an output shaft and a secondary driven gear and a differential arranged on the output shaft, and each shaft system is connected to the reducer housing assembly through two bearings.

[0040] Specifically, the reducer housing assembly includes a housing 1 of an integrated structure, such as Figure 1-4 as well as Figure 6As shown, the housing 1 includes two mounting parts 2, and the two mounting parts 2 are respectively provided with mounting holes 21 for mounting the intermediate shaft bearing 8. The two mounting holes 21 are coaxially arranged, that is, the two ends of the intermediate shaft 71 are respectively connected to the mounting holes 21 of the mounting parts 2 through the intermediate shaft bearing 8, and the two mounting parts 2 and the part located between the two mounting parts 2 form an installation space 3 for mounting the intermediate shaft system 7 (as shown in FIG. Figure 4 As shown), at least one mounting portion 2 is provided with a mounting opening connected to the mounting space 3 on the side facing the differential, the width of the mounting opening is not less than the diameter of the intermediate shaft 71, and the intermediate shaft 71 can enter the mounting space 3 through the mounting opening to realize the overall installation of the intermediate shaft system 7.

[0041] In the installed state, a primary driven gear 72 and a secondary driving gear 73 are fixedly sleeved outside the intermediate shaft 71 to form an intermediate shaft system 7 (such as Figure 7 As shown in the figure, due to the large diameter of the primary driven gear 72, the primary driven gear 72 cannot be installed from the side of the housing 1 along the axial direction of the intermediate shaft 71. In the present application, the intermediate shaft 71 can be installed in the installation space 3 through the installation opening. That is to say, before installation, the primary driven gear 72 and the secondary driving gear 73 can be first installed and fixed to the intermediate shaft 71 to form the intermediate shaft system 7, and then the installed intermediate shaft system 7 can be installed as a whole in the installation space 3 through the installation opening. Compared with the prior art, after the primary driven gear 72 is installed in the installation space 3 from the side facing the differential, the intermediate shaft 71 is then installed in the installation space 3 from the side end along its axial direction and press-fitted with the primary driven gear 72, the installation operation can be simplified, and when disassembling, the intermediate shaft 71 can be removed from the installation opening together with the gear installed on the intermediate shaft 71, which is convenient for disassembly and assembly, and can effectively improve the disassembly and assembly efficiency, and is convenient for installation and maintenance.

[0042] At the same time, since the entire shaft system has been assembled before installation and the relative position is stable, the processing parameters such as the coaxiality and roundness of the intermediate shaft system 7 can be guaranteed after installation, thereby improving the NVH performance (Noise, Vibration and Harshness, which refers to various indicators such as automobile noise, vibration and comfort) of the reducer assembly. In addition, the first-stage driven gear 72 and the second-stage driving gear 73 can be ground and trimmed as a whole after being installed with the intermediate shaft 71, so that the tooth surface accuracy of the gear itself can be guaranteed, the trimming effect of the gear itself is better, and the NVH performance is further optimized.

[0043] In addition, since the housing 1 is an integral structure and can be formed by integral processing, the coaxiality of the mounting holes 21 of the two mounting parts 2 is relatively high, and the housing 1 of the integral structure is similar to a Y-shaped structure, which can be matched with different bridge shell structures, suitable for different wheelbases of the vehicle model and the installation position of the whole vehicle, and has good scalability. Specifically, in this embodiment, the two mounting parts 2 can be respectively provided with mounting openings. During installation, the two ends of the intermediate shaft 71 respectively move along the radial direction thereof and enter the installation space 3 through the mounting openings. Alternatively, one mounting part 2 can be provided with a mounting opening, such as Figure 8 As shown, during installation, the intermediate shaft system 7 is first moved from the installation space 3 toward one side of the installation portion 2 with the installation opening into the installation space 3, and then the intermediate shaft system 7 is moved to another installation portion 2 (the installation portion 2 without the installation opening).

[0044] In the above embodiment, the reducer housing assembly further includes a mounting cover 4, which is arranged corresponding to the mounting portion 2, and the mounting cover 4 and the mounting portion 2 are detachably connected. Specifically, the mounting cover 4 is provided with a mounting surface, which can cooperate with the intermediate shaft bearing 8 from the mounting opening, that is, when the mounting cover 4 and the mounting portion 2 are fixedly mounted, the mounting surface of the mounting cover 4 is located at the mounting opening to form an extension surface of the inner wall of the mounting hole 21 at the mounting opening, and the mounting surface can wrap around the intermediate shaft bearing 8 along the circumferential direction with the inner wall of the mounting hole 21, thereby ensuring the structural stability and strength after installation. Since the mounting cover 4 and the mounting portion 2 are detachably connected, when the intermediate shaft system 7 needs to be removed, the mounting cover can be separated from the mounting portion 2, which is more convenient to operate.

[0045] In the above embodiment, the two mounting parts 2 are respectively provided with mounting openings, and the width of the mounting openings is not less than the outer diameter of the intermediate shaft bearing 8. In this way, during installation, the intermediate shaft bearing 8, the gear and the intermediate shaft 71 can be press-fitted to form an integral shaft system, and then the integral shaft system can be installed on the housing 1 as a whole, and then the mounting cover 4 is covered on the mounting opening to achieve installation. During disassembly, the mounting cover 4 is separated from the mounting part 2. At this time, the mounting opening is in an open state, and the integral shaft system can be directly taken out as a whole, which further simplifies the disassembly and assembly operation. In this way, it is equivalent to dividing the entire mounting hole 21 for mounting the intermediate shaft bearing 8 into two detachably connected half-hole structures. After the intermediate shaft bearing 8 can be moved along its radial direction and placed in one of the half-hole structures, the two half-hole structures are matched and fixed, and the mounting surfaces in the two half-hole structures can be enclosed to form an integral mounting surface that wraps around the outside of the intermediate shaft bearing 8 in the circumferential direction. When the width of the mounting opening is set to be not less than the diameter of the intermediate shaft bearing 8, the integral shaft system is installed as a whole, and no press-fitting operation is required after installation, which saves time and effort, and no press-fitting equipment is required, which can reduce costs.

[0046] Of course, in this embodiment, the width of the installation opening can also be set to be larger than the diameter of the intermediate shaft 71 and smaller than the diameter of the intermediate shaft bearing 8. In this case, the installation opening is equivalent to a gap opened in the installation hole 21. During installation, the intermediate shaft system 7 is installed into the installation space 3 through the installation opening (such as Figure 6 After the intermediate shaft bearing 8 is installed, the intermediate shaft bearing 8 is pressed into the installation hole 21 from the side along its axial direction so that it matches the installation hole 21 and the intermediate shaft 71. Since the width of the installation opening is smaller than the diameter of the intermediate shaft bearing 8, the position of the intermediate shaft bearing 8 after installation can also be guaranteed to be stable and will not be separated from the installation part 2. Of course, the installation cover 4 can further improve the structural strength of the installation part 2.

[0047] In the above embodiment, there is no limitation on the connection method between the mounting cover 4 and the mounting portion 2. Figure 5 As shown, mounting ears 41 are respectively provided at both ends of the mounting cover 4, and the two mounting ears 41 are respectively located on both sides of the length direction of the mounting surface, and each mounting ear 41 is connected to the mounting portion 2 by a first bolt 5 (as shown in FIG. Figure 1 and Figure 3 As shown). Alternatively, in this embodiment, one end of the mounting cover 4 may be hinged to the mounting portion 2, and the other end of the mounting cover 4 may be connected to the mounting portion 2 via a first bolt 5. Alternatively, the mounting cover 4 and the mounting portion 2 may be connected via a plurality of mounting ears 41 or a flange, and no specific limitation is made here. The two mounting ears 41 are respectively connected via the first bolt 5, and the structure is relatively simple, and the disassembly and assembly operation is relatively convenient.

[0048] In the above embodiment, when the mounting cover 4 is provided, a side of the mounting cover 4 away from the mounting surface is also provided with a clearance structure 42. Specifically, the shape and structure of the clearance structure 42 are not limited and can be provided according to the actual installation space 3. For example, it can be provided as an inclined surface structure or a groove structure, etc., to ensure that there is no interference with other components (such as the output shaft system). Of course, if the installation space 3 is large enough, the clearance structure 42 may not be provided.

[0049] In the above embodiment, a positioning structure is further provided between the mounting cover 4 and the mounting portion 2, which is used to position the mounting cover 4, and ensure that the mounting surface of the mounting cover 4 can cooperate with the mounting opening and act with the intermediate shaft bearing 8. Specifically, there is no limitation on the specific structure of the positioning structure, and it can be configured to include a positioning hole provided on the mounting portion 2 and a positioning pin provided on the mounting cover 4, or to include a positioning pin provided on the mounting portion 2 and a positioning hole provided on the mounting cover 4.

[0050] In the above embodiment, the reducer housing assembly also includes two mounting seats 6, which are used to install the output shaft bearings respectively, and at least one of the mounting seats 6 is a split structure, and the mounting seat 6 of the split structure includes a first seat body 61 and a second seat body 62. Specifically, the first seat body 61 is fixed to the housing 1 and is provided with a first mounting groove, and the second seat body 62 is detachably connected to the first seat body 61 and is provided with a second mounting groove. When the first seat body 61 and the second seat body 62 are installed and fixed, the inner wall surface of the first mounting groove can be enclosed with the inner wall surface of the second mounting groove to form a matching surface that is compatible with the output shaft bearing along the circumferential direction, and can be matched and fixed with the output shaft. Specifically, both mounting seats 6 can be split structures, or one of the mounting seats 6 can be a split structure, and no specific restrictions are made here.

[0051] In this embodiment, the two mounting seats 6 are both split structures, and each first seat body 61 is a structure integrally formed with the shell 1. The second seat body 62 is connected to the first seat body 61 by a second bolt 63. Such a setting can further simplify the installation operation and ensure the axial and radial dimensional accuracy after installation.

[0052] In this embodiment, during the installation process, the intermediate shaft system 7 and the output shaft system can be installed as a whole after assembly, which can simplify the disassembly and assembly operations and ensure dimensional accuracy, thereby ensuring the NVH performance of the reducer assembly. For the input shaft system 8, the input shaft 81 is installed in the housing 1 through the input shaft bearing 92. Specifically, the installation operation of the input shaft system 8 is not limited in this embodiment, and it can be installed according to the installation method in the prior art. To save space, it will not be repeated here.

[0053] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A reducer housing assembly, characterized in that: A housing (1) comprising an integrated structure; The housing (1) comprises two mounting parts (2), the two mounting parts (2) are respectively provided with mounting holes (21) for mounting intermediate shaft bearings (8), the two mounting holes (21) are coaxial, and a mounting space (3) for mounting the intermediate shaft system (7) is formed between the two mounting parts (2), at least one of the mounting parts (2) is provided with a mounting opening connected to the mounting space (3) on a side facing the differential, the width of the mounting opening is not less than the diameter of the intermediate shaft (71), and the intermediate shaft (71) can enter the mounting space (3) through the mounting opening; It also comprises a mounting cover (4), wherein the mounting cover (4) can be detachably connected to the mounting portion (2) provided with the mounting opening, and the mounting cover (4) is provided with a mounting surface adapted to the mounting opening, and the mounting surface can cooperate with the intermediate shaft bearing (8) from the mounting opening.

2. The reducer housing assembly according to claim 1, characterized in that: Each of the mounting portions (2) is provided with a mounting opening, and the width of the mounting opening is not less than the outer diameter of the intermediate shaft bearing (8).

3. The reducer housing assembly according to claim 1, characterized in that: The mounting cover (4) is provided with two mounting ears (41), the two mounting ears (41) are respectively located on both sides of the length direction of the mounting surface, and the mounting ears (41) are connected to the mounting portion (2) via a first bolt (5).

4. The reducer housing assembly according to claim 3, characterized in that: A side of the installation cover (4) away from the installation surface is also provided with a yielding structure (42).

5. The reducer housing assembly according to any one of claims 1 to 4, characterized in that: A positioning structure is also provided between the mounting portion (2) and the mounting cover (4).

6. The reducer housing assembly according to claim 1, characterized in that: The width of the installation opening is smaller than the outer diameter of the intermediate shaft bearing (8).

7. The reducer housing assembly according to any one of claims 1 to 4, characterized in that: It also includes two mounting seats (6), wherein the mounting seats (6) are used to mount output shaft bearings; At least one of the mounting seats (6) is a split structure, and the mounting seat (6) of the split structure comprises a first seat body (61) and a second seat body (62), wherein the first seat body (61) is fixed to the housing (1) and is provided with a first mounting groove, and the second seat body (62) is detachably connected to the first seat body (61) and is provided with a second mounting groove, and when the first seat body (61) and the second seat body (62) are fixed, the inner wall surface of the first mounting groove can be enclosed with the inner wall surface of the second mounting groove to form a matching surface that is compatible with the output shaft bearing along the circumferential direction.

8. The reducer housing assembly according to claim 7, characterized in that: Both of the two mounting seats (6) are split structures, and each of the first seat bodies (61) is integrally formed with the shell (1).

9. A reducer assembly, characterized in that: The invention comprises an intermediate shaft system (71) and a reducer housing assembly as claimed in any one of claims 1 to 8, wherein the intermediate shaft system (7) comprises an intermediate shaft (71), a primary driven gear (72) and a secondary driving gear (73), and the primary driven gear (72) and the secondary driving gear (73) are interference fit outside the intermediate shaft (71).

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