Reduction gear assembly

Abstract

The application discloses a reducer assembly, which comprises a reducer housing, a half shaft gear pair, a planetary gear pair, a planetary shaft and an output stage gear, the half shaft gear pair comprises two half shaft gears which are arranged at intervals along the extension direction of a first axis and are connected with the reducer housing; the planetary gear pair comprises two planetary gears which are engaged with the half shaft gears and are arranged at intervals along the extension direction of a second axis, the extension direction of the first axis is perpendicular to the extension direction of the second axis; the extension direction of the axis of the planetary shaft is the same as the extension direction of the second axis, the planetary gear is sleeved on the planetary shaft; the output stage gear surrounds the planetary gear and is fixedly connected with the planetary shaft, and the output stage gear drives the planetary gear and the planetary shaft to rotate around the first axis. In the above manner, the reducer assembly can be lightened.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to a speed reducer assembly. Background Technology

[0002] With the rapid development of modern industry, mechanical equipment is increasingly widely used in various fields. Among them, the speed reducer, as a crucial component of the transmission system, is vital to the overall efficiency of the equipment due to its performance and reliability. However, under current technological levels, the weight of the speed reducer assembly is becoming increasingly prominent, posing a significant bottleneck to improving equipment performance and reducing energy consumption. Therefore, reducing the weight of the speed reducer assembly has become an urgent technical problem to be solved. Utility Model Content

[0003] The main technical problem addressed by this application is to provide a speed reducer assembly that can achieve lightweight design.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a reducer assembly, comprising: a reducer housing; a half-shaft gear pair, including two half-shaft gears, the two half-shaft gears being spaced apart along the extension direction of a first axis, the half-shaft gears being connected to the reducer housing; a planetary gear pair, including two planetary gears, the planetary gears meshing with the half-shaft gears, being spaced apart along the extension direction of a second axis, the extension direction of the first axis being perpendicular to the extension direction of the second axis; a planetary shaft, the extension direction of the axis of the planetary shaft being the same as the extension direction of the second axis, the planetary gears being sleeved on the planetary shaft; and an output stage gear, surrounding the planetary gears and fixedly connected to the planetary shaft, the output stage gear driving the planetary gears and the planetary shaft to rotate around the first axis.

[0005] The planetary gear has a first shaft hole, and the end of the planetary shaft passes through the first shaft hole along the extension direction of the second axis and is fixedly connected to the output stage gear.

[0006] The first shaft hole has at least two oil grooves on its sidewall. The oil grooves are spiral in shape and the two oil grooves are intertwined.

[0007] The sidewall of the planetary shaft includes a first surface and a second surface disposed opposite to each other in the extension direction of the first axis, and both the first surface and the second surface are planar.

[0008] The reducer assembly further includes: a shim seat located on the inner side wall of the output stage gear; a shim mounted on the shim seat of the output stage gear, and the planetary shaft passing through the shim and fixed to the output stage gear.

[0009] The gasket has a first hole, and the planetary shaft passes through the first hole of the gasket and is fixed to the output stage gear. The shape of the first hole is the same as the cross-sectional shape of the planetary shaft along the gasket.

[0010] The reducer assembly further includes: a cover plate located on one side of the first surface of the planetary shaft and fixedly connected to the output stage gear, wherein the planetary shaft is located between the cover plate and the output stage gear.

[0011] The cover plate is provided with a first mounting hole, and the output stage gear is provided with a second mounting hole. The first mounting hole and the second mounting hole are correspondingly arranged, and the locking member passes through the first mounting hole and the second mounting hole to fix the cover plate and the output stage gear.

[0012] The output stage gear has a mounting base inside, and both ends of the planetary shaft are located inside the mounting base, which is used to fix the planetary shaft.

[0013] The output stage gear includes a plurality of teeth arranged at circumferential intervals along the output stage gear. The teeth include a first helical tooth and a second helical tooth connected together, and the first helical tooth and the second helical tooth have opposite inclination directions.

[0014] The beneficial effects of this application are as follows: Unlike the prior art, in this application, the output stage gear is fixedly connected to the planetary shaft, and the two planetary gears are sleeved on the planetary shaft. Driving the output stage gear to rotate can drive the planetary gears to revolve, and the planetary gears drive the half-shaft gears to rotate. The force difference between the half-shaft gears and the planetary gears causes the planetary gears to rotate on their own axis, so that the reducer assembly can realize the differential function. By replacing the differential housing in the traditional solution with the output stage gear, the weight of the reducer assembly is reduced, the reducer assembly is made lighter, and the stability of the reducer assembly is maintained at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of one embodiment of the reducer assembly of this application; Figure 2 This is a schematic diagram of another embodiment of the reducer assembly of this application; Figure 3 yes Figure 1 Cross-sectional structural diagram of the intermediate speed reducer assembly; Figure 4 yes Figure 3 Schematic diagram of the structure of the planetary gear; Figure 5 yes Figure 3 Schematic diagram of the structure of the planetary axis; Figure 6 yes Figure 3 Schematic diagram of the structure of the middle cover plate and the output stage gear; Figure 7 yes Figure 3 A schematic diagram of the structure of the middle gasket. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0017] As a core component of a car's drive axle, the differential's core function is to transmit power to both wheels while allowing them to rotate at different speeds when turning or on uneven surfaces, thus ensuring smooth vehicle steering. In traditional differential assemblies, the planetary shaft, planetary gears, half-shaft gears, and washers are all housed within the differential housing. In this design, the differential housing not only serves as the mounting base for internal gears, shafts, and other moving parts but also acts as the primary envelope carrier and load-bearing component, directly bearing and transmitting the input torque from the driven gear of the main reducer and the complex loads at the wheel ends. To meet the aforementioned structural strength and rigidity requirements, traditional differential housings generally employ a one-piece casting or split design. Their wall thickness and reinforcing rib arrangement prioritize load-bearing safety, directly resulting in high structural redundancy, heavy weight, and bulky size. Ultimately, this significantly increases the weight of the entire differential assembly, adding to the drive axle and vehicle curb weight, negatively impacting the vehicle's fuel economy and power responsiveness. Simply reducing the weight of the housing by reducing the material or simplifying the structure would directly weaken its rigidity as a primary load-bearing component, threatening the correct meshing and support stability of the gear system, and ultimately affecting the reliability and service life of the differential assembly. To address the technical challenge of balancing lightweight design and structural stability, this application proposes the following technical solution.

[0018] See Figure 1 , Figure 2 and Figure 3 The reducer assembly 1 includes a reducer housing 10, a half-shaft gear pair 20, a planetary gear pair 30, a planetary shaft 40, and an output stage gear 50.

[0019] The half-shaft gear pair 20 includes two half-shaft gears 210, which are spaced apart along the extension direction of the first axis 21. The half-shaft gears 210 are connected to the reducer housing 10. The planetary gear pair 30 includes two planetary gears 310, which mesh with the half-shaft gears 210 and are spaced apart along the extension direction of the second axis 31. The extension direction of the first axis 21 is perpendicular to the extension direction of the second axis 31. The extension direction of the axis of the planetary shaft 40 is the same as the extension direction of the second axis 31. The planetary gears 310 are sleeved on the planetary shaft 40. The output stage gear 50 surrounds the planetary gears 310 and is fixedly connected to the planetary shaft 40. The output stage gear 50 drives the planetary gears 310 and the planetary shaft 40 to rotate around the first axis 21.

[0020] Specifically, the half-shaft gear 210 is connected to the reducer housing 10, and the reducer housing 10 and the half-shaft gear 210 are coaxially arranged, that is, the axial directions of the half-shaft gear 210 and the reducer housing 10 are both located in the extension direction of the first axis 21. Thus, the axial directions of the half-shaft gear 210 and the reducer are both located in the extension direction of the first axis 21, which is convenient for application in coaxial reducers. The vehicle's engine drives the output stage gear 50 to rotate, and the power of the output stage gear 50 is transmitted to the planetary gear 310. The output stage gear 50 drives the planetary gear 310 and the planetary shaft 40 to rotate together around the first axis 21. The rotation of the planetary gear 310 around the first axis 21 is the revolution state of the planetary gear 310. Correspondingly, the rotation of the planetary gear 310 around the second axis 31 is the rotation state of the planetary gear 310. The half-shaft gear 210 drives the planetary gear 310 to rotate. According to the rotation state of the planetary gear 310, the rotation speeds of the two half-shaft gears 210 can be different, that is, the differential function of the reducer assembly 1 can be realized. For example, in one application scenario, when the car is traveling in a straight line, the inner drive wheel and the outer drive wheel rotate at the same speed. Correspondingly, the half-shaft gear 210 corresponding to the inner drive wheel and the half-shaft gear 210 corresponding to the outer drive wheel experience equal resistance. The equal resistance will lock the planetary gear 310, preventing the planetary gear 310 from rotating around its own axis. At this time, the planetary gear 310 is in a state of revolution and does not rotate on its own axis, and the two half-shaft gears 210 rotate at the same speed. In one application scenario, when the car is turning, because the inner drive wheel has a shorter travel and the outer drive wheel has a longer travel, the outer drive wheel needs to rotate faster. Correspondingly, the resistance of the half-shaft gear 210 corresponding to the inner drive wheel increases, so the rotation speed of the inner half-shaft gear 210 tends to slow down, while the rotation speed of the half-shaft gear 210 corresponding to the outer drive wheel tends to rotate faster. The force formed by the difference in rotation speed between the two half-shaft gears 210 breaks the balance acting on the planetary gear 310, causing the planetary gear 310 to start rotating around its own axis while revolving around the sun. At this time, the planetary gear 310 is in a state of revolution and rotation, and the rotation speeds of the two half-shaft gears 210 are different.

[0021] In this application, the output stage gear 50 is fixedly connected to the planetary shaft 40, and the two planetary gears 310 are sleeved on the planetary shaft 40. Driving the output stage gear 50 to rotate can drive the planetary gears 310 to revolve. The planetary gears 310 drive the half-shaft gear 210 to rotate. The force difference between the half-shaft gear 210 and the planetary gear 310 causes the planetary gear 310 to rotate on its own axis, so that the reducer assembly 1 can realize the differential function. By replacing the differential housing in the traditional solution with the output stage gear 50, the weight of the reducer assembly 1 is reduced, the reducer assembly 1 is made lighter, and the stability of the reducer assembly 1 is maintained.

[0022] Continue reading Figure 3 In one embodiment, the bearing 90 is sleeved on the rotating shaft of the half-shaft gear 210. The half-shaft gear 210 is rotatably connected to the bearing 90, and the bearing 90 is fixedly connected to the reducer housing 10. The bearing 90 provides support and fixation for the half-shaft gear 210, preventing axial or radial movement of the half-shaft gear 210. (See also...) Figure 4 In one embodiment, the planetary gear 310 is provided with a first shaft hole 311, and the end of the planetary shaft 40 passes through the first shaft hole 311 along the extension direction of the second axis 31 and is fixedly connected to the output stage gear 50.

[0023] Specifically, the end of the planetary shaft 40 passes through the first shaft hole 311 of the two planetary gears 310, so that the planetary gears 310 are sleeved on the planetary shaft 40. The end of the planetary shaft 40 is fixedly connected to the output stage gear 50. When the planetary gears 310 revolve, the planetary gears 310 and the planetary shaft 40 rotate together around the extension direction of the first axis 21. When the planetary gears 310 rotate on their own axis, the planetary gears 310 rotate around the extension direction of the planetary shaft 40, that is, the planetary gears 310 rotate relative to the planetary shaft 40. When the planetary gears 310 revolve, the planetary gears 310 are stationary relative to the planetary shaft 40. By providing the first shaft hole 311, it is convenient to install and remove the planetary gears 310.

[0024] Continue reading Figure 4 In one embodiment, the sidewall of the first shaft hole 311 is provided with at least two oil grooves 312, the oil grooves 312 are spiral in shape, and the two oil grooves 312 are intertwined.

[0025] Specifically, the two oil grooves 312 located on the side wall of the first shaft hole 311 are intertwined. That is, one oil groove 312 is in a spiral shape that rotates clockwise, and the other oil groove 312 is in a spiral shape that rotates counterclockwise. The two oil grooves 312 can be symmetrically arranged along the second axis 31 or asymmetrically arranged. The arrangement of the oil grooves 312 facilitates the introduction of oil into the first shaft hole 311, and also facilitates the retention of oil between the planetary shaft 40 and the planetary gear 310 for continuous lubrication. This prevents the planetary shaft 40 and the planetary gear 310 from generating a large amount of heat that cannot be dissipated under high-speed operation, thereby improving the stability of the reducer assembly 1.

[0026] Furthermore, in one embodiment, the sidewall of the first shaft hole 311 is provided with multiple oil grooves 312, which can be three, four or five. Some of the oil grooves 312 are spirals that rotate clockwise, and the other part of the oil grooves 312 are spirals that rotate counterclockwise. The two parts of the oil grooves 312 are intertwined to facilitate the introduction and preservation of oil.

[0027] See Figure 5 In one embodiment, the sidewall of the planetary axis 40 includes a first surface 41 and a second surface 42 disposed opposite to each other in the extension direction of the first axis 21, both the first surface 41 and the second surface 42 being planar.

[0028] Specifically, the first surface 41 and the second surface 42 are arranged opposite to each other in the extension direction of the first axis 21. Both the first surface 41 and the second surface 42 on the sidewall of the planetary shaft 40 are planar, meaning the planetary shaft 40 is configured as a through-body flat slot. This through-body flat slot structure facilitates the fixed connection between the planetary shaft 40 and the output stage gear 50, so as to transmit the power of the output stage gear 50 to the half-shaft gear 210. See Figure 6 and Figure 7 Furthermore, in one embodiment, the reducer assembly 1 also includes a gasket seat 510 and a gasket 60.

[0029] The shim holder 510 is located on the inner side wall of the output stage gear 50, the shim 60 is mounted on the shim holder 510 of the output stage gear 50, and the planetary shaft 40 passes through the shim 60 and is fixed to the output stage gear 50.

[0030] Specifically, the shim holder 510 is disposed on the inner side wall of the output shaft gear to provide support for the shim 60. The shim 60 is mounted on the shim holder 510 and is located between the planetary gear 310 and the output stage gear 50. When the planetary shaft 40 gear rotates, the planetary gear 310 rotates relative to the shim 60 and the output stage gear 50, while the shim 60 and the output stage gear 50 remain relatively stationary. This reduces the friction between the planetary gear 310 and the output stage gear 50, extends the service life of the output stage gear 50, reduces noise, and improves NVH performance.

[0031] Continue reading Figure 7 In one embodiment, the shim 60 is provided with a first hole 61, through which the planetary shaft 40 passes and is fixed to the output stage gear 50. The shape of the first hole 61 is the same as the cross-sectional shape of the planetary shaft 40 along the shim 60.

[0032] Specifically, the first surface 41 and the second surface 42 of the planetary shaft 40 are parallel, making the cross-section of the planetary shaft 40 along the shim 60 roughly rectangular. The shape of the first hole 61 is the same as the cross-sectional shape of the planetary shaft 40 along the shim 60, and the shape of the hole in the shim 60 is also roughly rectangular. That is, the sidewall of the first hole 61 of the shim 60 is provided with two planes arranged opposite to each other in the extension direction of the first axis 21. Compared with setting the first hole 61 of the shim 60 as a round hole, the roughly rectangular shape of the first hole 61 of the shim 60 makes the shim 60 always remain relatively stationary with respect to the planetary shaft 40, avoiding the shim 60 from creeping under the high-speed rotation of the planetary gear 310, thereby reducing abnormal wear of the shim seat 510.

[0033] Continue reading Figure 6 In one embodiment, the reducer assembly 1 further includes a cover plate 70 located on one side of the first surface 41 of the planetary shaft 40. The cover plate 70 is fixedly connected to the output stage gear 50, and the planetary shaft 40 is located between the cover plate 70 and the output stage gear 50.

[0034] Specifically, the cover plate 70 is fixedly connected to the output stage gear 50, so that the planetary shaft 40 is restricted between the cover plate 70 and the output stage gear 50. The cover plate 70 and the output stage gear 50 can be fixedly connected by welding, screwing, riveting, etc., thereby fixing both ends of the planetary shaft 40 to the output stage gear 50 and preventing abnormal displacement of the planetary shaft 40.

[0035] Continue reading Figure 6 In one embodiment, the cover plate 70 is provided with a first mounting hole 71, and the output stage gear 50 is provided with a second mounting hole 51. The first mounting hole 71 and the second mounting hole 51 are provided correspondingly. A locking member (not shown) passes through the first mounting hole 71 and the second mounting hole 51 to fix the cover plate 70 and the output stage gear 50.

[0036] Specifically, the first mounting hole 71 of the cover plate 70 corresponds to the second mounting hole 51 of the output stage gear 50. A locking element passes through the first mounting hole 71 and the second mounting hole 51 to fix the cover plate 70 and the output stage gear 50. The locking element can be a bolt, screw, or rivet. The first mounting hole 71 and the second mounting hole 51 are threaded holes or smooth holes adapted to the locking element. For example, when the locking element is a bolt, the first mounting hole 71 and the second mounting hole 51 are threaded holes. The locking element fixes the cover plate 70 and the output stage gear 50, improving the stability and strength of the connection.

[0037] See Figure 6 In one embodiment, the output stage gear 50 is provided with a mounting base 520 inside, and both ends of the planetary shaft 40 are located inside the mounting base 520. The mounting base 520 is used to fix the planetary shaft 40.

[0038] Specifically, the output stage gear 50 has a mounting base 520 inside, and both ends of the planetary shaft 40 are located inside the mounting base 520. The mounting base 520 is used to support and fix the planetary shaft 40, and can also limit the movement of the planetary shaft 40 to improve the stability of the planetary shaft 40.

[0039] See Figure 6 In one embodiment, the output stage gear 50 includes a plurality of teeth 530 arranged at circumferential intervals along the output stage gear 50. The teeth 530 include a first helical tooth 531 and a second helical tooth 532 connected together, and the first helical tooth 531 and the second helical tooth 532 have opposite inclination directions.

[0040] Specifically, the output stage gear 50 has multiple teeth 530 arranged circumferentially. Each tooth 530 includes a first helical tooth 531 and a second helical tooth 532 with opposite inclination directions. That is, each gear is herringbone shaped, or it can be considered that the gear is in the shape of less than or greater than. Compared with the traditional design, the axial forces generated by the first helical tooth 531 and the second helical tooth 532 on the herringbone gear are equal in magnitude and completely opposite in direction, so that the two axial forces cancel each other out, greatly reducing the radial force, making it easier for the half shaft gear 210 to bear the corresponding radial force, and improving the overall strength of the reducer assembly 1.

[0041] In another embodiment, the teeth 530 of the output stage gear 50 can also be configured as a straight line, with two symmetrically distributed gears on both sides of the first axis 21 driving the output stage gear 50 simultaneously, thereby reducing the radial force of the output stage gear 50.

[0042] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A reducer assembly, characterized by, include: Gearbox housing; A half-shaft gear pair, comprising two half-shaft gears, the two half-shaft gears being spaced apart along the extension direction of a first axis, the half-shaft gears being connected to the reducer housing; A planetary gear pair includes two planetary gears that mesh with the half-shaft gear and are spaced apart along the extension direction of a second axis, wherein the extension direction of the first axis is perpendicular to the extension direction of the second axis. A planetary shaft, wherein the extension direction of the axis of the planetary shaft is the same as the extension direction of the second axis, and the planetary gear is sleeved on the planetary shaft; An output stage gear surrounds the planetary gear and is fixedly connected to the planetary shaft. The output stage gear drives the planetary gear and the planetary shaft to rotate around the first axis.

2. The reducer assembly of claim 1, wherein, The planetary gear has a first shaft hole, and the end of the planetary shaft passes through the first shaft hole along the extension direction of the second axis and is fixedly connected to the output stage gear.

3. The reducer assembly of claim 2, wherein, The sidewall of the first shaft hole is provided with at least two oil grooves, which are spiral in shape and the two oil grooves are intertwined.

4. The reducer assembly of claim 1, wherein, The sidewall of the planetary shaft includes a first surface and a second surface disposed opposite to each other in the extension direction of the first axis, both of which are planar.

5. The reducer assembly of claim 4, wherein, The reducer assembly also includes: A gasket seat is located on the inner sidewall of the output stage gear; A shim is mounted on the shim seat of the output stage gear, and the planetary shaft passes through the shim and is fixed to the output stage gear.

6. The reducer assembly of claim 5, wherein, The gasket has a first hole, and the planetary shaft passes through the first hole of the gasket and is fixed to the output stage gear. The shape of the first hole is the same as the cross-sectional shape of the planetary shaft along the gasket.

7. The reducer assembly of claim 4, wherein, The reducer assembly also includes: A cover plate is located on one side of the first surface of the planetary shaft and is fixedly connected to the output stage gear. The planetary shaft is located between the cover plate and the output stage gear.

8. The reducer assembly according to claim 7, characterized in that, The cover plate is provided with a first mounting hole, and the output stage gear is provided with a second mounting hole. The first mounting hole and the second mounting hole are correspondingly arranged, and the locking member passes through the first mounting hole and the second mounting hole to fix the cover plate and the output stage gear.

9. The reducer assembly of claim 7, wherein, The output stage gear has a mounting base inside, and both ends of the planetary shaft are located inside the mounting base. The mounting base is used to fix the planetary shaft.

10. The reducer assembly of claim 1, wherein, The output stage gear includes a plurality of teeth arranged at circumferential intervals along the output stage gear, the teeth including a first helical tooth and a second helical tooth connected together, the first helical tooth and the second helical tooth having opposite inclination directions.

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