Axle housing assembly of U-shaped structure and electric drive axle assembly

Abstract

The utility model relates to the technical field of electric drive axle assemblies, in particular to an axle housing assembly of a U-shaped structure and an electric drive axle assembly. An axle housing assembly of a U-shaped structure is of a three-section type symmetrical structure and comprises a middle axle housing body, U-shaped seats symmetrically connected to the two ends of the axle housing body and a hub axle tube, and the two ends of the middle axle housing body are connected with the U-shaped seats to form the U-shaped structure. The electric drive axle assembly comprises the axle housing assembly of the U-shaped structure and further comprises a hub and brake disc assembly, a brake assembly, a half shaft assembly and a motor integrated differential mechanism assembly. According to the utility model, the motor integrated differential mechanism assembly is semi-surrounded in the inner space of the U-shaped structure of the axle housing assembly, so that a compact mounting environment is provided for a motor module, and the problem that the floor of the whole vehicle is raised due to a traditional externally-hung motor is avoided. The three-section type axle housing design can quickly meet the requirements of the whole vehicle with different plate spring distances by adjusting the connecting position of the middle axle housing body and the U-shaped seat.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric drive axle assembly, specifically relates to a bridge housing assembly of U type structure and electric drive axle assembly. BACKGROUND

[0002] With the popularization of electric drive of city logistics vehicles, sanitation vehicles and other light commercial vehicles, as the core transmission component of the chassis, the lightweight, low cost and flexible adaptation of the electric drive axle assembly become the key of technology research.

[0003] The mainstream electric drive axle scheme in the market has the following problems:

[0004] Limited space arrangement: the traditional external hanging motor design leads to a large space in the middle of the bridge shell, which raises the vehicle floor height and compresses the loading space; although the existing integrated electric drive axle reduces the volume, the rigid connection of the motor and the bridge shell limits the selection range of the power module, which is difficult to directly adapt to mature motors in the market.

[0005] Insufficient expandability: most electric drive axles adopt an integrated bridge shell structure, when the vehicle leaf spring distance (suspension mounting point distance) changes, the bridge shell needs to be redesigned and die cast, which has a long development cycle and high cost; although the split bridge shell can partially alleviate the problem, its segmented structure is complex, and still has defects such as poor part universality and low expansion efficiency.

[0006] Therefore, it is urgent to develop a bridge shell assembly of U type structure and an electric drive axle assembly to solve the above problems. INVENTION CONTENTS

[0007] The utility model provides a bridge shell assembly of U type structure and an electric drive axle assembly to solve the above problems, which are modularized, lightweight and can quickly adapt to different motors, and realize the rapid expansion development of different leaf spring distances.

[0008] The technical scheme of the utility model for solving the above technical problems is as follows:

[0009] Bridge shell body, symmetrical structure;

[0010] A pair of U-shaped seats are symmetrically arranged on both sides of the bridge shell body and are detachably connected with the bridge shell body, and the whole is in a U-shaped structure, and the length of the U-shaped structure can be adjusted by adjusting the connection position of the U-shaped seat on the bridge shell body;

[0011] A pair of hub shaft pipes are symmetrically arranged on both sides of the bridge shell body, the hub shaft pipe is fixed to the side surface of the U-shaped seat, and is connected through a stop opening positioning connection, and the two bottom parts of the U-shaped seat are used for connecting the two ends of the leaf spring suspension.

[0012] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0013] Further, the left and right sides of the axle housing are respectively provided with an array of evenly distributed bolt holes, the U-shaped seat is provided with an oblong hole at the corresponding position, the axle housing can be adjusted and installed along the length direction of the oblong hole, and the axle housing is detachably connected with the U-shaped seat through flange bolts four.

[0014] Further, the hub shaft tube is fixed to the side surface of the U-shaped seat through flange bolts three, and the connecting interface between the U-shaped seat and the hub shaft tube is provided with a radial positioning stop.

[0015] Further, the axial section of the axle housing is a box beam structure, and at least two annular lightening holes are arranged, the axial projection area of the lightening hole accounts for 20%-40% of the cross-sectional area of the axle housing, and the U-shaped seat is an integral casting and is provided with a lightening cavity in the middle.

[0016] Further, the hub shaft tube is integrally formed, and the inner hole end face is processed with a bearing mounting position and an oil seal position.

[0017] Further, an electric drive axle assembly comprises the U-shaped axle housing assembly, further comprises: a hub and brake disc assembly, a brake assembly, a half shaft assembly and a motor integrated differential assembly; the hub and brake disc assembly comprises a hub and a brake disc; wherein the brake disc is connected with the hub through flange bolts two to transmit the braking force of the brake disc;

[0018] The brake assembly is mounted on the top of the U-shaped seat through an internal hexagonal bolt;

[0019] The motor integrated differential assembly is located at the intermediate position inside the U-shaped structure of the axle housing assembly and is connected with the whole vehicle suspension, and the motor integrated differential assembly is connected with the half shaft assembly at both ends;

[0020] The half shaft assembly passes through the hub shaft tube to connect the hub and brake disc assembly.

[0021] Further, the half shaft assembly is provided with an external spline at both ends, the motor integrated differential assembly is provided with an internal spline matched with the external spline of the half shaft assembly; one end of the half shaft assembly is connected with the motor integrated differential assembly, and the other end passes through the hub shaft tube and is connected with the hub and brake disc assembly through a flange.

[0022] Further, the flange is provided with an internal spline matched with the external spline of the half shaft assembly; the outer edge of the flange is positioned and embedded in the brake disc through a stop, and is fixedly connected with the brake disc through flange bolts one; the part of the half shaft assembly passing out of the flange is provided with a thread and is sleeved with a locking piece, a lock nut is threadedly connected with the half shaft assembly, and a hub cover is mounted on the outer end surface of the half shaft assembly.

[0023] Further, the wheel hub shaft pipe is provided with a wheel hub bearing unit at one end away from the U-shaped seat, the inner ring of the wheel hub bearing unit is pre-tightly fixed with the wheel hub shaft pipe through an adjusting nut, and the two are gap-fitted, and the outer ring of the wheel hub bearing unit is interference-fitted with the wheel hub inner hole.

[0024] Further, the half shaft assembly middle section adopts a ball cage type universal joint, a deep groove ball bearing is installed in the wheel hub shaft pipe, the half shaft assembly is supported on the wheel hub shaft pipe through the deep groove ball bearing assembly, the deep groove ball bearing is gap-fitted with the half shaft assembly, and the deep groove ball bearing is interference-fitted with the wheel hub shaft pipe.

[0025] The utility model discloses the beneficial effect is:

[0026] 1, the utility model discloses bridge housing assembly adopts U type layout, maximumly reserves the arrangement space of various structures motor assembly, and is more friendly to motor assembly module. U type structure provides half ring embrace type arrangement space for motor, and motor integrated differential assembly is located inside the intermediate position of U type structure and is connected with whole vehicle suspension, avoids floor height lifting, and reduces the mass under spring. Bridge housing assembly adopts three -section type symmetrical structure design, satisfies the bearing capacity, realizes self -weight light, can satisfy the whole vehicle input demand of different plate spring distance through the connecting position of adjusting bridge housing and U type seat, need not re -opening mode, and the middle bridge housing body shape is simple, and the whole sand type casting is very easy to realize, and the manufacturing cost is low.

[0027] 2, the utility model discloses half shaft assembly two ends adopt the spline design, one end connects motor assembly, and the other end connects flange, and flange and wheel hub and brake disc assembly adopt flange bolt connection, and motor integrated differential assembly power output, passes through half shaft assembly, flange, wheel hub and brake disc assembly, and finally is transmitted to the wheel;Wheel hub and brake disc assembly are supported on the wheel hub shaft pipe through the wheel hub bearing unit, and the wheel hub bearing unit receives and transmits various forces and moments from the wheel end, and half shaft assembly only transmits torque, does not bear vertical force and lateral force. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the structural schematic diagram of the electric drive bridge assembly of the utility model embodiment;

[0029] Figure 2 It is the partial sectional view of the electric drive bridge assembly wheel end of the utility model embodiment;

[0030] Figure 3 It is the structural schematic diagram of the bridge housing assembly of the utility model embodiment.

[0031] In the drawings, the component list represented by each sign is as follows:

[0032] 1. Axle housing assembly; 2. Wheel hub and brake disc assembly; 3. Brake assembly; 4. Half shaft assembly; 5. Motor integrated differential assembly; 6. Flange; 7. Locking plate; 8. Locking nut; 9. Hub cap; 10. Flange bolt one; 11. Deep groove ball bearing assembly; 12. Oil seal position; 21. Brake disc; 22. Wheel hub; 23. Wheel hub bearing unit; 24. Adjusting nut; 25. Flange bolt two; 26. Socket head bolt; 31. Axle housing; 32. U-shaped seat; 33. Wheel hub axle tube; 34. Flange bolt three; 35. Flange bolt four. Detailed Implementation

[0033] 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 skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0036] Example

[0037] like Figure 3 As shown, a U-shaped axle housing assembly includes: a symmetrical axle housing 31, a pair of U-shaped seats 32, and a pair of hub tubes 33;

[0038] A pair of U-shaped seats 32 are symmetrically arranged on both sides of the axle housing 31, and two U-shaped seats 32 are respectively connected to both ends of the axle housing 31 through six flange bolts four 35, and the whole is in a U-shaped structure; the axle housing 31 is provided with an array of bolt holes on the left and right sides, and the U-shaped seat 32 is provided with an oblong hole at the corresponding position, and the axle housing 31 can be adjusted and connected along the length direction of the oblong hole, so as to realize the overall length adjustment and quickly expand to meet the vehicle input demand of different plate spring distances.

[0039] A pair of hub shaft tubes 33 are symmetrically arranged on both sides of the axle housing 31, the connection interface between the U-shaped seat 32 and the hub shaft tube 33 is provided with a radial positioning stop, and the connection is positioned through the stop to ensure the connection position accuracy, and the hub shaft tube 33 is fixed to the side surface of the U-shaped seat 32 through eight flange bolts three 34, and the two U-shaped seat 32 bottoms are used to connect the two ends of the plate spring suspension, so that the plate spring suspension is located below the whole U-shaped structure, the unsprung mass is small, and the vehicle comfort is good.

[0040] Among them, the hub shaft tube 33 is integrally formed, and the inner hole end face is processed with bearing installation position and oil seal position 12. It is convenient to provide half shaft assembly 4 auxiliary support and sealing.

[0041] Among them, the axial section of the axle housing 31 is a box beam structure, and at least two annular lightening holes are provided, the axial projection area of the lightening hole accounts for 20%-40% of the cross-sectional area of the axle housing 31, and the U-shaped seat 32 is an integral casting, and a lightening cavity is provided in the middle. The lightening hole and the lightening cavity are hollow designed, which not only ensures the stiffness, but also realizes the light weight.

[0042] As shown in Figures 1-2 A kind of electric drive axle assembly, including the axle housing assembly 1 of above-mentioned U-shaped structure;Still include: wheel hub and brake disc assembly 2, brake assembly 3, half shaft assembly 4 and motor integrated differential assembly 5;The wheel hub and brake disc assembly 2 includes wheel hub 22 and brake disc 21;Brake disc 21 is connected wheel hub 22 by flange bolt two 25, and brake force of brake disc 21 is transmitted;

[0043] The brake assembly 3 is installed on the top of the U-shaped seat 32 by the inner hexagonal bolt 26;

[0044] The motor integrated differential assembly 5 is located at the intermediate position inside the U-shaped structure of the axle housing assembly 1, and is connected with the vehicle suspension, and the motor integrated differential assembly 5 is connected with the half shaft assembly 4 at both ends;

[0045] The half shaft assembly 4 passes through the hub shaft tube 33 to connect the wheel hub and brake disc assembly 2.

[0046] In a preferred embodiment, the half shaft assembly 4 is provided with external splines at both ends, and the motor integrated differential assembly 5 is provided with internal splines to match the external splines of the half shaft assembly 4; one end of the half shaft assembly 4 is connected to the motor integrated differential assembly 5, and the other end passes through the hub shaft tube 33 and is connected to the hub and brake disc assembly 2 through the flange 6.

[0047] Specifically, the flange 6 is provided with internal splines to match the external splines of the half shaft assembly 4; the outer edge of the flange 6 is positioned and embedded in the brake disc 21 through a stop, and is fixedly connected to the brake disc 21 through the flange bolt 10; the part of the half shaft assembly 4 that passes out of the flange 6 is provided with a thread on the outer surface and is sleeved with a lock plate 7, and a lock nut 8 is threadedly connected to the half shaft assembly 4, and a hub cover 9 is installed on the outer side end face of the half shaft assembly 4. The flange 6 and the brake disc 21 are positioned by a stop to ensure accurate positioning; the flange 6 and the half shaft assembly 4 are matched by splines to transmit the torque from the wheel end, the flange 6 and the half shaft assembly 4 are positioned by end faces and are prevented from loosening by the lock plate 7 and the lock nut 8 to prevent the half shaft assembly 4 from axially moving; the hub cover 9 is installed on the outer side end face of the flange 6 to realize sealing of the wheel end.

[0048] In a preferred embodiment, the hub shaft tube 33 is provided with a hub bearing unit 23 at the end away from the U-shaped seat 32, the inner ring of the hub bearing unit 23 is pre-tightly fixed to the hub shaft tube 33 through an adjusting nut 24, and the two are gap-matched, and the outer ring of the hub bearing unit 23 is interference-fitted with the inner hole of the hub 22. The adjusting nut 24 adjusts the bearing pre-tightening force to ensure that the wheel end starting force is within a suitable range, the wheel end rotates flexibly, and the bearing play meets the design requirements.

[0049] In a preferred embodiment, the middle section of the half shaft assembly 4 adopts a ball cage type universal joint, a deep groove ball bearing assembly 11 is installed in the hub shaft tube 33, the half shaft assembly 4 is supported on the hub shaft tube 33 through the deep groove ball bearing assembly 11, the deep groove ball bearing assembly 11 is gap-matched with the half shaft assembly 4, and the deep groove ball bearing assembly 11 is interference-fitted with the hub shaft tube 33. The deep groove ball bearing assembly 11 is used for auxiliary support on the hub shaft tube 33, which is conducive to adapting to the certain range of changes in the vertical position of the motor caused by vibration and improving the service life of the half shaft assembly 4.

[0050] The utility model discloses a working principle: the electric drive axle assembly of the utility model passes through the modular structure design and power transmission cooperation, realizes efficient, stable torque transmission and load bearing. The motor integrated differential assembly 5 is as power source, and the output torque is passed through the spline engagement of half shaft assembly 4 and is transmitted to the flange 6, and then the flange 6's flange connection drive wheel hub and brake disc assembly 2 rotate, finally drive the wheel movement. In this process, the ball cage type universal joint of half shaft assembly 4 middle section can dynamically compensate the relative displacement between motor and wheel caused by road bump or frame deformation, avoid the stress concentration of transmission system because of rigid connection, and the deep groove ball bearing assembly 11 provides radial auxiliary support to half shaft assembly 4, limits its radial runout, and ensures transmission smoothness.

[0051] The U-shaped structure of axle housing assembly 1 half-encircles motor integrated differential assembly 5 in its internal space, provides compact installation environment for motor module, avoids the problem of vehicle floor lifting caused by traditional external motor. The wheel hub bearing unit 23 of wheel hub shaft pipe 33 bears the vertical load and lateral force from the wheel through interference fit, and transmits the force to U-shaped seat 32 and axle housing 31, and finally disperses to the frame.

[0052] Although the embodiments or examples of the present disclosure have been described with reference to the drawings, it should be understood that the above-mentioned methods, systems and devices are only exemplary embodiments or examples, and the scope of the utility model is not limited by these embodiments or examples, but is only limited by the granted claims and their equivalent scope. Various elements in the embodiments or examples can be omitted or replaced by equivalent elements. In addition, each step can be performed in an order different from that described in the present disclosure. Further, various elements in the embodiments or examples can be combined in various ways. What is important is that as technology evolves, many elements described herein can be replaced by equivalent elements that appear after the present disclosure.

Claims

1. A U-shaped bridge housing assembly, characterized in that, include: Bridge shell, symmetrical structure; A pair of U-shaped seats are symmetrically arranged on both sides of the bridge housing and are detachably connected to the bridge housing. The whole structure is U-shaped. The length of the U-shaped structure can be adjusted by adjusting the connection position between the U-shaped seats and the bridge housing. A pair of hub tubes are symmetrically arranged on both sides of the axle housing. The hub tubes are fixed to the side of the U-shaped seat and are connected by a stop. The bottom of the two U-shaped seats is used to connect the two ends of the leaf spring suspension.

2. The bridge housing assembly with a U-shaped structure according to claim 1, characterized in that, The bridge housing has an array of evenly distributed bolt holes on its left and right sides, and the U-shaped seat has an elongated hole at the corresponding position. The bridge housing can be adjusted in installation position along the length of the elongated hole. The bridge housing is detachably connected to the U-shaped seat by flange bolts.

3. The bridge housing assembly with a U-shaped structure according to claim 1, characterized in that, The hub axle tube is fixed to the side of the U-shaped seat by flange bolts, and the connection interface between the U-shaped seat and the hub axle tube is provided with a radial positioning stop.

4. The bridge housing assembly with a U-shaped structure according to claim 1, characterized in that, The axial section of the bridge housing is a box beam structure, and it is provided with at least two annular weight reduction holes. The axial projected area of ​​the weight reduction holes accounts for 20%-40% of the cross-sectional area of ​​the bridge housing. The U-shaped seat is an integral casting with a weight reduction cavity in the middle.

5. The bridge housing assembly with a U-shaped structure according to claim 1, characterized in that, The hub tube is integrally formed, and its inner end face is machined with a bearing mounting position and an oil seal position.

6. An electric drive bridge assembly, characterized in that, The axle housing assembly with a U-shaped structure as described in any one of claims 1-5 is further comprising: a wheel hub and brake disc assembly, a brake assembly, a half-shaft assembly, and a motor-integrated differential assembly; wherein the wheel hub and brake disc assembly comprises a wheel hub and a brake disc; The brake assembly is mounted on the top of the U-shaped base; The motor-integrated differential assembly is located in the middle of the U-shaped structure of the axle housing assembly and is connected to the vehicle mount. The two ends of the motor-integrated differential assembly are connected to the half-shaft assembly. The half-shaft assembly passes through the hub tube and connects to the hub and brake disc assembly.

7. The electric drive bridge assembly according to claim 6, characterized in that, The half-shaft assembly has external splines at both ends, and the motor-integrated differential assembly has internal splines that mate with the external splines of the half-shaft assembly. One end of the half-shaft assembly is connected to the motor-integrated differential assembly, and the other end passes through the wheel hub tube and is connected to the wheel hub and brake disc assembly via a flange.

8. The electric drive bridge assembly according to claim 7, characterized in that, The flange is provided with an internal spline, which mates with the external spline of the half-shaft assembly; the outer edge of the flange is positioned and embedded into the brake disc through a stop, and the brake disc is fixedly connected by a flange bolt; the part of the half-shaft assembly that protrudes from the flange has a thread on its outer surface and is fitted with a locking plate, and the locking nut is threadedly connected to the half-shaft assembly; a hub cap is installed on the outer end face of the half-shaft assembly.

9. The electric drive bridge assembly according to claim 6, characterized in that, The hub axle tube is provided with a hub bearing unit at one end away from the U-shaped seat. The inner ring of the hub bearing unit is pre-tightened and fixed to the hub axle tube by adjusting the nut, and the two are clearance fit. The outer ring of the hub bearing unit is interference fit with the inner hole of the hub.

10. The electric drive bridge assembly according to claim 6, characterized in that, The middle section of the half-shaft assembly adopts a ball cage universal joint, and a deep groove ball bearing is installed inside the wheel hub tube. The half-shaft assembly is supported on the wheel hub tube by the deep groove ball bearing assembly. The deep groove ball bearing is clearance-fitted with the half-shaft assembly and interference-fitted with the wheel hub tube.

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