New energy automobile two-gear electric drive axle synchronizer gear hub

Abstract

The utility model discloses a gear hub of a two-gear electric drive axle synchronizer of a new energy automobile. The gear hub comprises a gear hub body. The gear hub body comprises an external spline part and an internal spline reinforcing part which are concentrically arranged, and a radial plate part connected with the external spline part and the internal spline reinforcing part; an outer spline is arranged on the outer spline part, a center hole is formed in the inner spline reinforcing part, and an inner spline is arranged around the side wall of the center hole; a plurality of tooth-missing parts sunken towards the inner spline reinforcing part are arranged around the outer side of the outer spline part in the circumferential direction, limiting bosses are arranged on the tooth-missing parts, and a plurality of inner side protrusions are arranged at the positions, corresponding to the tooth-missing parts, of the inner side of the outer spline part; a plurality of oil grooves communicated with the center hole are symmetrically formed in the two end faces of the internal spline reinforcing part, and the center line of each oil groove and the center line of the adjacent tooth missing part form an included angle alpha; a plurality of step blind holes are formed in the outer spline part and located between every two adjacent spline teeth in the outer spline, the edges of the step blind holes extend to the tooth surfaces, and the step blind holes are parallel to the center line of the oil groove.

Description

Technical Field

[0001] The utility model relates to the technical field of processing parts of a two-speed electric drive axle of a new energy vehicle, and in particular to a synchronizer gear hub of a two-speed electric drive axle of a new energy vehicle. Background Art

[0002] With the rapid development of new energy vehicles, dual-motor two-speed electric drive axle systems have gradually become mainstream. Compared with traditional dual-clutch DCT gearboxes or manual MT gearboxes, dual-motor two-speed electric drive axle gearboxes have the advantages of small size and large torque. The two-speed electric drive axle gearbox uses only one synchronizer gear hub to achieve gear shifting. The gear hub has many functions, complex product structure, large torque, and high strength requirements. The two combined teeth are arranged on both sides of the synchronizer gear sleeve, with a simple structure, convenient control, and high transmission efficiency, which meets the requirements of new energy vehicles for large torque and small space.

[0003] The synchronizers of the dual-motor two-speed electric drive axle of new energy vehicles are limited by space. The synchronizers currently on the market are equipped with sliders in the outer spline grooves of the gear hub, and the assembly occupies a large space, which cannot meet the assembly requirements of the dual-motor two-speed electric drive axle synchronizers. The outer spline part of the gear hub with sliders has a slider groove. This structure is prone to stress concentration during load transmission. Excessive stress can easily cause fatigue fracture of the gear hub, which cannot meet the requirements of the dual-motor two-speed electric drive axle synchronizer gear hub to bear large torque.

[0004] In the current market, when the synchronizer gear hub is shifting, the friction force is large when the gear sleeve slides along the axial direction, and there is a sense of stagnation when shifting. During the docking and transmission process of the gear hub, the surface oil film is docking, and the oil layer is easily unevenly distributed or even partially lacking under contact vibration and frequent rotation, resulting in increased noise, reduced shifting smoothness and efficiency during the shifting operation. Utility Model Content

[0005] The purpose of the utility model is to provide a synchronizer gear hub for a two-speed electric drive axle of a new energy vehicle, so as to meet the use structure and performance requirements of the synchronizer gear hub for a two-speed electric drive axle gearbox of a new energy vehicle with a small volume and high torque.

[0006] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0007] The utility model designs a two-speed electric drive bridge synchronizer gear hub for new energy vehicles, wherein the synchronizer gear hub comprises a gear hub body;

[0008] The gear hub body comprises an outer spline portion and an inner spline reinforcement portion which are arranged concentrically, and a spoke portion connecting the outer spline portion and the inner spline reinforcement portion;

[0009] The external spline portion is provided with an external spline, the internal spline reinforcement portion is provided with a central hole, and the side wall surrounding the central hole is provided with an internal spline;

[0010] A plurality of toothless portions are arranged around the outer circumference of the outer spline portion and are recessed toward the inner spline reinforcement portion. A limited position boss is arranged on the toothless portion. A plurality of inner protrusions are arranged on the inner side of the outer spline portion corresponding to the position of the toothless portion.

[0011] A plurality of oil grooves connected to the center hole are symmetrically arranged on both end surfaces of the internal spline reinforcement portion, and the center line of the oil groove forms an angle α with the center line of the adjacent toothless portion;

[0012] The external spline portion is also provided with a plurality of step blind holes, and the step blind holes are located between two adjacent key teeth in the external spline, the edges of the step blind holes extend to the tooth surface, and the step blind holes are parallel to the center line of the oil groove.

[0013] Specifically, each step blind hole is arranged opposite to the oil groove one by one, and the oil groove can ensure the circulation of lubricating oil, realize good lubrication of the synchronizer gear hub, and thus make the gear shifting smoother and more fluent.

[0014] Furthermore, a new energy vehicle two-speed electric drive axle synchronizer gear hub: three groups of missing teeth are arranged at equal intervals around the outer circumference of the external spline part.

[0015] Specifically, the toothless portion is designed to be concave, the main function of which is to reduce the weight of the gear hub body, improve the driving effect of the shifting structure under the same driving force, and reduce the wear problem caused by inter-tooth jitter.

[0016] Furthermore, a new energy vehicle two-speed electric drive axle synchronizer gear hub: the inner spline reinforcement portion has a relative reinforcement upper end face and a reinforcement lower end face; the reinforcement upper end face and the reinforcement lower end face are respectively and symmetrically provided with three groups of oil grooves connected to the center hole at equal intervals.

[0017] Furthermore, a two-speed electric drive axle synchronizer gear hub of a new energy vehicle has an included angle α=60°.

[0018] Furthermore, a synchronizer gear hub for a two-speed electric drive axle of a new energy vehicle: the step blind hole comprises a blind hole upper section and a blind hole lower section which are connected to each other; the diameter of the upper port and the lower port of the blind hole upper section are consistent and larger than the diameter of the steel ball; the diameter of the blind hole lower section is smaller than that of the blind hole upper section, a compression spring is arranged in the blind hole lower section, and one end of the compression spring extends into the blind hole upper section, and the compression spring is used to push the steel ball out of the blind hole upper section.

[0019] Furthermore, a two-speed electric drive axle synchronizer gear hub for new energy vehicles: the upper port is located between two adjacent key teeth in the external spline, and the edge of the upper port extends to the middle of the tooth surface.

[0020] Furthermore, a new energy vehicle two-speed electric drive axle synchronizer gear hub: the outer spline portion has relative upper and lower end faces, and the step blind hole is arranged at the center position of the upper and lower end faces.

[0021] Beneficial effects of the utility model:

[0022] (1) The synchronizer gear hub of the two-speed electric drive axle of a new energy vehicle designed by the utility model replaces the traditional structure of the slider groove assembly slider and steel ring by the spring and steel ball structure, so that the structure of the synchronizer gear hub is simple, the manufacturing cost is reduced and the space is saved.

[0023] (2) The external spline of the gear hub of the utility model is provided with three groups of missing teeth, and a limiting boss is provided at one end of the outer side of the missing teeth. When the gear sleeve slides axially during the gear shifting process, the friction force can be reduced, the concentricity can be better guaranteed, the gear shifting is smoother, and the feeling of sticking can be prevented.

[0024] (3) The utility model sets the missing tooth portion to be concave and provided with an inner protrusion, mainly to reduce the weight of the gear hub body without affecting the strength of the gear hub, to improve the pushing effect of the shifting structure under the same pushing force and to reduce the wear problem caused by the jitter between teeth.

[0025] (4) The spline reinforcement portion inside the gear hub of the utility model is provided with three groups of oil grooves connected to the center hole, which can ensure the circulation of lubricating oil, reduce the friction force of gear shifting, achieve good lubrication of the synchronizer gear hub, make the gear shifting smoother and smoother, and increase the service life of the synchronizer gear hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a two-speed electric drive axle synchronizer gear hub for a new energy vehicle designed for Embodiment 1 of the utility model;

[0028] Figure 2 A front view of a two-speed electric drive axle synchronizer gear hub for a new energy vehicle designed for Example 1 of the utility model;

[0029] Figure 3 for Figure 2 View from the center AA direction.

[0030] Markings in the figure:

[0031] 1-hub body, 11-external spline portion, 12-internal spline reinforcement portion, 13-spoke plate portion, 111-external spline, 112-toothless portion, 113-limiting boss, 114-inner protrusion, 115-step blind hole, 116-upper end face, 117-lower end face, 121-center hole, 122-internal spline, 123-oil groove, 124-reinforced portion upper end face, 125-reinforced portion lower end face, 1151-blind hole upper section, 1152-blind hole lower section, 1153-upper port, 1154-lower port. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom" and the like indicate positions or positional relationships, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second" and the like are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein.

[0034] Example 1

[0035] like Figures 1 to 3 As shown, this embodiment 1 designs a two-speed electric drive bridge synchronizer gear hub for new energy vehicles, and the synchronizer gear hub includes a gear hub body 1;

[0036] The gear hub body 1 comprises an outer spline portion 11 and an inner spline reinforcement portion 12 which are arranged concentrically, and a spoke portion 13 connecting the outer spline portion 11 and the inner spline reinforcement portion 12;

[0037] The outer spline portion 11 is provided with an outer spline 111, the inner spline reinforcement portion 12 is provided with a center hole 121, and the side wall surrounding the center hole 121 is provided with an inner spline 122;

[0038] Three groups of missing tooth portions 112 are arranged at equal intervals around the outer side of the outer spline portion 11 and are recessed toward the inner spline reinforcement portion 12. A limited position boss 113 is arranged on the missing tooth portion 112. Three groups of inner side protrusions 114 are also arranged on the inner side of the outer spline portion 11 at positions corresponding to the missing tooth portions 112.

[0039] The inner spline reinforcement portion 12 has an upper reinforcement end surface 124 and a lower reinforcement end surface 125 opposite to each other, and three groups of oil grooves 123 communicating with the center hole 121 are symmetrically arranged at equal intervals on the upper reinforcement end surface 124 and the lower reinforcement end surface 125, and the center line of the oil groove 123 forms an angle α (α=60°) with the center line of the adjacent toothless portion 112;

[0040] The external spline portion 11 has an upper end face 116 and a lower end face 117 relative to each other. Three groups of stepped blind holes 115 are arranged at the central positions of the upper end face 116 and the lower end face 117 in the external spline portion 11, and the stepped blind hole 115 includes a blind hole upper section 1151 and a blind hole lower section 1152 which are arranged in communication. The diameter of the blind hole upper section 1151 is larger than that of the blind hole lower section 1152. The diameter of the upper port 1153 of the blind hole upper section 1151 is consistent with that of the lower port 1154 and is larger than the diameter of the steel ball. A compression spring is arranged in the blind hole lower section 1152, and one end of the compression spring extends into the blind hole upper section 1151. The compression spring is used to push the steel ball out of the blind hole upper section 1151. The upper port 1153 of the stepped blind hole 115 is located between two adjacent key teeth in the external spline 111, and the edge of the upper port 1153 extends to the middle of the tooth surface. The stepped blind hole 115 is parallel to the center line of the oil groove 123.

[0041] The gear hub of the two-speed electric drive axle synchronizer for new energy vehicles designed in the above-mentioned embodiment 1 has three groups of missing tooth portions 112 arranged in an array on the outer spline portion 11, and a limiting boss 113 is provided at one end of the outer side of the missing tooth portion 112. When the gear sleeve slides axially during the gear shifting process, the friction force can be reduced, the concentricity can be better guaranteed, the gear shifting can be smoother, and the feeling of sticking can be prevented. The missing tooth portion 112 is concavely arranged and is provided with an inner protrusion 114, which is mainly for reducing the weight of the main body without affecting the strength of the gear hub. The weight reduction of the gear hub body 1 can improve the driving effect of the gear shifting structure under the same driving force and reduce the wear problem caused by the jitter between teeth.

[0042] The synchronizer gear hub of the two-speed electric drive axle of the new energy vehicle designed in the above-mentioned embodiment 1 has three groups of oil grooves 123 connected with the center hole 121 arranged on the inner spline reinforcement part 12. The oil grooves 123 can ensure the circulation of lubricating oil, realize the good lubrication of the synchronizer gear hub, reduce the friction in the gear shifting process, make the gear shifting smoother and smoother, and increase the service life of the synchronizer gear hub.

[0043] The new energy vehicle two-speed electric drive bridge synchronizer gear hub designed in the above embodiment 1 adopts an external spline part 11 to drill a step blind hole 115, a spring is installed in the lower section 1152 of the step blind hole, a steel ball is placed in the upper section 1151 of the step blind hole, the spring supports the steel ball, and the steel ball is tangent to the inner diameter ring groove of the gear sleeve to ensure that the gear sleeve is accurately and stably set. The spring steel ball structure replaces the traditional slider groove assembly slider and steel ring structure, making the synchronizer gear hub structure simple, reducing costs, saving space, avoiding the problem of stress concentration in the gear hub structure with slider grooves during load transmission, causing fatigue fracture failure of the gear hub, improving the reliability of gear hub shifting, and meeting the requirements of large torque and small space for the new energy vehicle reduction box synchronizer.

[0044] In addition, in the process of powder metallurgy pressing and forming, it is inconvenient to directly form the side holes of the product. Therefore, the step blind holes on the side of the synchronizer gear hub are usually drilled after sintering. Due to the high hardness of the product, the drilling efficiency is low and the drill bit wear rate is large. After drilling, burrs and sharp edges will remain at the spline tooth root. At the same time, burrs and sharp edges have certain strength and hardness, and the removal efficiency is low, and the process cost is high. The synchronizer gear hub of the utility model directly forms the gear hub blank through powder metallurgy. After the green billet is demolded, sensors and green billet multi-station drilling and deburring tooling are set at the conveyor belt position. After the green billet is demolded, the conveyor belt and sensors are used to accurately position the green billet on the tooling. The step blind holes and deburring are drilled online at multiple stations at the same time, which greatly improves the production efficiency and product quality of the side drilling after sintering and reduces the cost. The synchronizer gear hub of the utility model can meet the high performance and low cost requirements of the synchronizer of the dual-motor two-speed electric drive axle of new energy vehicles.

[0045] The above preferred embodiments of the utility model are only used to explain the utility model, and are not used to limit the utility model. Any obvious changes or modifications derived from the technical solution of the utility model are still within the protection scope of the utility model.

Claims

1. A two-speed electric drive axle synchronizer gear hub for new energy vehicles, characterized in that: The synchronizer gear hub comprises a gear hub body (1); The gear hub body (1) comprises an outer spline portion (11) and an inner spline reinforcement portion (12) which are arranged concentrically, and a spoke plate portion (13) connecting the outer spline portion (11) and the inner spline reinforcement portion (12); The external spline portion (11) is provided with an external spline (111), the internal spline reinforcement portion (12) is provided with a center hole (121), and the side wall surrounding the center hole (121) is provided with an internal spline (122); A plurality of toothless portions (112) are arranged around the outer circumference of the external spline portion (11) and are recessed toward the internal spline reinforcement portion (12); a limiting boss (113) is arranged on the toothless portion (112); and a plurality of inner protrusions (114) are arranged on the inner side of the external spline portion (11) at positions corresponding to the toothless portions (112); A plurality of oil grooves (123) in communication with the center hole (121) are symmetrically arranged on both end surfaces of the internal spline reinforcement portion (12), and the center line of the oil groove (123) forms an angle α with the center line of the adjacent toothless portion (112); The external spline portion (11) is also provided with a plurality of step blind holes (115), and the step blind hole (115) is located between two adjacent key teeth in the external spline (111), and the edge of the step blind hole (115) extends to the tooth surface, and the step blind hole (115) is parallel to the center line of the oil groove (123).

2. A two-speed electric drive axle synchronizer gear hub for new energy vehicles according to claim 1, characterized in that: Three groups of tooth-missing portions (112) are arranged at equal intervals in the circumferential direction around the outer side of the external spline portion (11).

3. A two-speed electric drive axle synchronizer gear hub for new energy vehicles according to claim 2, characterized in that: The inner spline reinforcement portion (12) has an upper reinforcement portion end surface (124) and a lower reinforcement portion end surface (125) opposite to each other; The upper end surface (124) of the reinforcement portion and the lower end surface (125) of the reinforcement portion are symmetrically provided with three groups of oil grooves (123) communicating with the central hole (121) at equal intervals.

4. A two-speed electric drive axle synchronizer gear hub for new energy vehicles according to claim 3, characterized in that: Angle α=60°.

5. The two-speed electric drive axle synchronizer gear hub for new energy vehicles according to claim 1, characterized in that: The step blind hole (115) comprises a blind hole upper section (1151) and a blind hole lower section (1152) which are connected to each other; The diameters of the upper port (1153) and the lower port (1154) of the blind hole upper section (1151) are consistent and larger than the diameter of the steel ball; the diameter of the blind hole lower section (1152) is smaller than that of the blind hole upper section (1151); a compression spring is provided in the blind hole lower section (1152), and one end of the spring extends into the blind hole upper section (1151); the spring is used to push the steel ball out of the blind hole upper section (1151).

6. A two-speed electric drive axle synchronizer gear hub for new energy vehicles according to claim 5, characterized in that: The upper port (1153) is located between two adjacent key teeth in the external spline (111), and the edge of the upper port (1153) extends to the middle of the tooth surface.

7. The two-speed electric drive axle synchronizer gear hub for new energy vehicles according to claim 1, characterized in that: The external spline portion (11) has an upper end surface (116) and a lower end surface (117) opposite to each other, and the stepped blind hole (115) is arranged at the center position of the upper end surface (116) and the lower end surface (117).

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