Electric drive axle housing and automobile

Abstract

The utility model discloses an electric drive axle housing and an automobile, and relates to the technical field of automobiles, specifically, the electric drive axle housing comprises a frame part and a hollow beam part which are integrally formed, and an inner cavity of the hollow beam is communicated with an inner cavity of the frame part; the upper end face and the lower end face of the frame part are each provided with a first flange connecting face. The two sets of hollow beam parts are coaxially arranged at the two ends of the frame part, differential lock mounting holes are formed in the side walls of one set of hollow beam parts in a penetrating mode, second flange connecting faces are arranged on the outer walls, corresponding to the hollow beam parts, of the differential lock mounting holes, and the second flange connecting faces and one set of first flange connecting faces are coplanar; according to the electric drive axle housing and the automobile, the differential lock mounting hole is formed in the hollow beam part, and the differential lock assembly is mounted in the axle housing, so that the size of a reduction gearbox is reduced, the suitability of the axle housing is ensured on the premise that the automobile has the function of a differential mechanism, the research and development cost is reduced, and the research and development period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, and more specifically, to an electric drive axle housing. In addition, the utility model also relates to an automobile comprising the electric drive axle housing. Background Art

[0002] The axle housing is an important component of the automobile chassis assembly. It is mainly used to install the main reducer, half shaft and other parts. It can also support the gravity of the car and transmit various forces on the wheels to the frame or body components through the suspension system.

[0003] The differential lock is a locking mechanism installed on the central differential, used in four-wheel drive vehicles. Its function is to improve the vehicle's ability to pass on bad roads, that is, when one of the vehicle's drive axles is idling, the differential can be quickly locked, making the two drive axles rigidly connected.

[0004] With the rapid development of electric drive axles, some electric drive axles do not have differential functions, which causes problems such as unilateral wheel idling and slipping when the vehicle is stuck, which is not conducive to the vehicle getting out of trouble;

[0005] However, a part of the differential is integrated in the reducer case, which is not convenient for maintenance and assembly, and causes the size of the reducer case to increase. The traditional bridge housing cannot be directly adapted and used, and the bridge housing needs to be re-molded and redesigned, which has high R&D costs and a long R&D cycle.

[0006] In summary, how to provide an electric drive axle housing that can avoid the differential lock being built into the reduction gearbox, solve the difficulties in installation and maintenance of the differential lock, and the poor adaptability of the axle housing is a problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0007] In view of this, the purpose of the utility model is to provide an electric drive axle housing, by arranging a differential lock mounting hole in the hollow beam portion, installing the differential lock assembly inside the bridge housing, thereby reducing the volume of the reduction box, so that the vehicle can ensure the adaptability of the bridge housing while having the differential function, thereby reducing R&D costs and shortening the R&D cycle.

[0008] Another object of the utility model is to provide a car including the above-mentioned electric drive axle housing, which has the same technical features and can achieve the same technical effects.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] An electric drive axle housing comprises an integrally formed frame portion and a hollow beam portion, wherein an inner cavity of the hollow beam is in communication with an inner cavity of the frame portion;

[0011] The upper and lower end surfaces of the frame portion are both provided with a first flange connection surface;

[0012] Two groups of the hollow beam parts are coaxially arranged at both ends of the frame part. A differential lock mounting hole is penetrated through the side wall of one group of the hollow beam parts. A second flange connection surface is arranged corresponding to the outer wall of the hollow beam part of the differential lock mounting hole. The second flange connection surface is coplanar with one group of the first flange connection surfaces.

[0013] Preferably, a plurality of groups of blind threaded holes are uniformly arranged on the surface of the first flange connection surface, and a penetrating oil injection hole is arranged on the side wall of the frame part.

[0014] Preferably, a differential lock assembly is further included. The differential lock assembly includes a piston cavity, a piston and a fork;

[0015] The piston cavity penetrates through the differential lock mounting hole and is fixedly installed with the second flange connection surface. The piston is slidably and sealingly installed in the piston cavity of the piston cavity. The rod body of the piston extends to the outside of the piston cavity, and a fork is arranged at the end for rotatably clamping with a locking sleeve in the inner cavity of the hollow beam part.

[0016] Preferably, the piston cavity includes a cavity part inside the hollow beam part and a mounting plate outside the hollow beam part;

[0017] The piston cavity is arranged in the cavity part and is provided with a through hole at one end facing the frame part for the rod body of the piston to penetrate through;

[0018] The mounting plate is connected with the second flange connection surface by bolts.

[0019] Preferably, a high-pressure oil hole is arranged at one end of the piston cavity far from the through hole, and a spring is arranged in the piston cavity for pushing the piston to move towards the end of the piston cavity where the high-pressure oil hole is arranged.

[0020] Preferably, the fork includes an integral sleeve part and a fork body part;

[0021] The sleeve part is fixedly sleeved on the end of the rod body of the piston, and the fork body part is clamped with the locking sleeve.

[0022] Preferably, a wedge-shaped surface is arranged on the outer peripheral surface of the sleeve part along the direction of its own center line, and a pressure switch is fixedly arranged in the mounting plate. The contact of the pressure switch abuts against the wedge-shaped surface;

[0023] When the piston moves towards the side of the through hole, the wedge-shaped surface can push the contact of the pressure switch to retract, and when the piston moves towards the other side, the contact of the pressure switch resets.

[0024] Preferably, the end of the rod body of the piston is a spherical structure;

[0025] The inner cavity of the sleeve part of the shift fork is a spherical cavity adapted to the spherical structure, and a limit screw is connected to the end of the rod body of the piston by a thread to prevent the separation of the sleeve part from the rod body of the piston.

[0026] Preferably, the hole wall on the side of the differential lock mounting hole close to the frame part is an arc surface, and a protrusion adapted to the arc surface is provided on the side of the mounting plate in contact with the second flange connection surface.

[0027] An automobile includes the electric drive axle housing according to any one of the above.

[0028] Compared with the prior art, the electric drive axle housing provided by the present invention has at least the following beneficial effects:

[0029] 1. A frame part is arranged in the middle, and first flange connection surfaces are arranged at both ends of the frame part, which is convenient for the fixed installation of the main reducer or the drive motor from both sides. After installation, a sealed cavity can be formed in the frame part, which is convenient for filling gear oil for the heat dissipation and lubrication of each transmission component.

[0030] 2. Differential lock mounting holes are arranged on the surface of the hollow beam part, and the differential lock is installed in the hollow beam part through the differential lock mounting holes, which reduces the installation difficulty, improves the convenience of maintenance, and solves the problem of the increase in the volume of the reducer caused by installing the differential lock in the reducer;

[0031] 3. For an automobile that does not need to install a differential lock, only the differential lock hole needs to be closed. The frame part can be applied to both vehicles with a differential lock and those without a differential lock, and the overall applicability is strong. When developing a new vehicle, it can effectively shorten the R & D time and reduce the R & D cost.

[0032] An automobile including the above-mentioned electric drive axle housing has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of the specific electric drive axle housing provided by the present invention;

[0035] Figure 2 It is a schematic structural diagram of another embodiment of the specific electric drive axle housing provided by the present invention;

[0036] Figure 3 The structural schematic diagram of the specific differential lock assembly provided by the present utility model;

[0037] Figure 4 The installation schematic diagram of the specific differential lock assembly provided by the present utility model.

[0038] Figures 1 - 4 Wherein:

[0039] 1. Frame part; 101. First flange connection surface; 102. Oil injection hole; 2. Hollow beam part; 201. Differential lock installation hole; 202. Second flange connection surface; 3. Differential lock assembly; 301. Piston cavity; 302. Fork; 303. Locking sleeve; 304. Pressure switch; 305. Piston; 306. Spring. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0041] The core of the present utility model is to provide an electric drive axle housing. By arranging a differential lock installation hole in the hollow beam part and installing the differential lock assembly inside the axle housing, the volume of the reduction gearbox is reduced, and the adaptability of the axle housing is ensured while the vehicle has the differential function, thereby reducing the R & D cost and shortening the R & D cycle.

[0042] Another core of the present utility model is to provide an automobile including the above electric drive axle housing, which has the same technical features and can achieve the same technical effects.

[0043] Please refer to Figures 1 - 4 , an electric drive axle housing, including an integrally formed frame part 1 and a hollow beam part 2, and the inner cavity of the hollow beam 2 is communicated with the inner cavity of the frame part 1;

[0044] Both upper and lower end faces of the frame part 1 are provided with first flange connection surfaces 101;

[0045] Two groups of hollow beam parts 2 are coaxially arranged at both ends of the frame part 1. A differential lock installation hole 201 is penetrated through the side wall of one group of hollow beam parts 2, and a second flange connection surface 202 is provided corresponding to the outer wall of the hollow beam part 2. The second flange connection surface 202 and one group of first flange connection surfaces 101 are coplanar;

[0046] During assembly, for vehicles with a differential lock, first pass the differential lock assembly 3 through the differential lock mounting hole 201, and fix the differential lock assembly 3 to the differential lock mounting hole 201 with bolts;

[0047] Subsequently, insert the half shafts from the end of the hollow beam portion 2 until the ends extend into the frame portion 1 and are assembled and connected to the differential within the frame portion 1. One set of half shafts is connected to the locking sleeve 303 through a spline structure;

[0048] Finally, fix the reduction gearbox and the drive motor on both sides of the frame portion 1 with bolts, connect the output shaft of the reduction gearbox to the input shaft of the differential, and make the locking sleeve 303 coaxial with the housing of the differential. With the axial movement of the locking sleeve 303, the combination and separation of the half shafts on both sides are achieved.

[0049] When designing the first flange connection surface 101 and the second flange connection surface 202, make them protrude from the surfaces of the frame portion 1 and the hollow beam portion 2, which helps to ensure the flatness and sealing performance of the connection surface;

[0050] And design the second flange connection surface 202 to be coplanar with one set of the first flange connection surfaces 101, so that the differential lock assembly 3, the differential, and the main reduction gearbox share the same installation reference, which helps to ensure the installation accuracy of the differential lock assembly 3 with the half shaft or the differential.

[0051] In some embodiments, directly integrating the differential lock with the differential and setting it in the main reduction gearbox causes an increase in the volume of the main reduction gearbox, requires an increase in the cross-sectional area of the frame portion 1, resulting in a decrease in the overall rigidity of the axle housing, which is not conducive to the load-bearing of the vehicle body. At the same time, developing a new axle housing has a long cycle and high cost. Therefore, by providing a differential lock mounting hole 201 in the hollow beam portion and integrating the differential lock assembly 3 into the hollow beam portion 2, the problem of the increase in the volume of the main reduction gearbox caused by integrating the differential lock into the main reduction gearbox is effectively solved;

[0052] Installing the differential lock assembly 3 in the hollow beam portion 2 helps to improve the maintenance convenience of the differential lock assembly 3, and can be installed without changing the structure of the original axle housing frame portion 1, with less impact on the overall rigidity of the axle housing. For vehicles that do not require a differential lock, there is no need to separately design the main reduction gearbox and the axle housing. Only the differential lock mounting hole 201 needs to be blocked, and the overall applicability of the axle housing is strong, which can effectively reduce the R & D cost and shorten the R & D cycle.

[0053] In some embodiments, as Figure 1 shown, a number of sets of threaded blind holes are evenly provided on the surface of the first flange connection surface 101, and a through oil injection hole 102 is provided on the side wall of the frame portion 1;

[0054] The design of the threaded blind hole facilitates the installation of the main reduction gearbox or the drive motor with the frame portion 1 of the bridge housing by bolts, and helps to improve the sealing of the threaded connection position and prevent oil leakage in the threaded hole;

[0055] At the same time, an oil filling hole 102 is provided on the side wall of the frame part 1 to facilitate the injection of gear oil into the inner cavity of the frame part 1 to cool and lubricate the transmission parts in the main reduction gearbox and / or the differential to ensure the normal operation of the internal mechanical transmission parts.

[0056] In some embodiments, Figure 3 and Figure 4 As shown, a differential lock assembly 3 is also included, and the differential lock assembly 3 includes a piston cavity 301, a piston 305 and a shift fork 302;

[0057] The piston cavity 301 passes through the differential lock mounting hole 201 and is fixedly mounted on the second flange connection surface 202. The piston 305 is slidingly sealed and mounted in the piston cavity in the piston cavity 301. The rod of the piston extends to the outside of the piston cavity, and a shift fork 302 is provided at the end thereof for rotationally engaging with the locking sleeve 303 in the inner cavity of the hollow beam portion 2.

[0058] The differential lock assembly 3 uses the piston 305 to drive the fork 302 to move axially, and then drives the locking sleeve 303 to move axially through the fork 302. The locking and separation of the half-axles on both sides are achieved through the engagement and separation between the locking sleeve 303 and the differential lock housing, that is, the transformation between the two-wheel drive axle and the rigid connection is achieved, which effectively solves the problem of wheel idling and slipping after the vehicle is stuck, and helps to improve the vehicle's ability to escape from difficulties.

[0059] In some embodiments, Figure 4 As shown, the piston cavity 301 includes a cavity portion located inside the hollow beam portion 2 and a mounting plate located outside the hollow beam portion 2;

[0060] The piston cavity is arranged in the cavity part, and a through hole for the rod body of the piston 305 to pass through is arranged at one end facing the frame part 1;

[0061] The mounting plate is connected to the second flange connection surface 202 by bolts.

[0062] The piston cavity 301 adopts an embedded design, with the cavity part directly built into the cavity of the hollow beam part 2, and the mounting plate is placed outside the differential lock mounting hole 201 and fixed with bolts to facilitate disassembly and maintenance, and to protect the cavity part and the fork 302 to prevent them from being damaged by bumps.

[0063] In some embodiments, Figure 4As shown, a high-pressure oil hole is provided at one end of the piston chamber away from the through hole. A spring 306 is arranged in the piston chamber to push the piston 305 to move towards the end of the piston chamber where the high-pressure oil hole is provided.

[0064] By providing a high-pressure oil hole at one end of the piston chamber, when high-pressure oil is input, the piston 305 can be pushed to move towards the other end, that is, drive the fork 302 and the locking sleeve 303 to act, realizing the locking of the differential lock, changing from a two-wheel drive axle to a rigid connection, and the half shafts on both sides rotate at the same speed, improving the vehicle's ability to get out of trouble; when the high-pressure oil is depressurized, the piston 305 can automatically reset under the action of the spring 306, that is, drive the fork 302 and the locking sleeve 303 to reset, realizing the unlocking of the differential lock, the rigid connection is disconnected, and the half shafts on both sides distribute the rotational speed under the action of the differential, facilitating the turning of the vehicle during driving.

[0065] In some embodiments, as Figure 4 shown, the fork 302 includes an integrated sleeve portion and a fork body portion;

[0066] The sleeve portion is fixedly sleeved on the rod end of the piston 305, and the fork body portion is clamped with the locking sleeve 303;

[0067] The rod of the piston 305 and the fork 302 are designed in a split manner, which is convenient for repairing and replacing individual parts. For example, after the fork 302 is used for a long time, the movement allowance will increase due to wear, and the fork 302 needs to be replaced. The split design can reduce the cost and difficulty of replacement and repair.

[0068] In some other embodiments, a one-piece design of the rod of the fork 302 and the piston 305 is directly adopted, or the rod of the fork 302 and the piston 305 are directly connected and fixed by bolts.

[0069] In some embodiments, as Figure 4 shown, a wedge surface is arranged on the outer peripheral surface of the sleeve portion along the direction of its own center line. A pressure switch 304 is fixedly arranged in the mounting plate, and the contact of the pressure switch 304 abuts against the wedge surface;

[0070] When the piston 305 moves towards the through hole side, the wedge surface can push the contact of the pressure switch 304 to retract, and when the piston 305 moves towards the other side, the contact of the pressure switch 304 resets;

[0071] By setting a pressure switch 304, the position of the fork 302 is monitored, and the monitoring signal is transmitted to the vehicle's control unit and displayed through the instrument panel or indicator light, so that the driver can clearly know the working state of the current differential lock. Specifically, when the fork 302 extends with the piston 305, the differential lock is in the locked state. At this time, the contact of the pressure switch 304 retreats under the extrusion of the wedge surface, and the pressure switch 304 sends a high-level signal; when the fork 302 retracts with the piston 305, the contact of the pressure switch 304 resets, and the pressure switch 304 sends a low-level signal. The vehicle's control unit can judge the position state of the fork 302 at this time through the received signal level, that is, it can judge the working state of the differential lock at this time.

[0072] In some embodiments, the rod end of the piston 305 is a spherical structure;

[0073] The inner cavity of the sleeve part of the fork 302 is a spherical cavity adapted to the spherical structure, and a limit screw is connected to the rod end of the piston 305 by a thread to prevent the separation of the sleeve part from the rod of the piston 305;

[0074] During actual assembly, it should be ensured that the axis of the half shaft is consistent with the sliding direction of the piston 305, that is, the moving direction of the fork 302 driving the locking sleeve 303 is consistent with the axial direction of the half shaft. However, during actual assembly, due to production errors, there will be a certain angle between the axis of the half shaft and the sliding direction of the piston 305. If the fork 302 is rigidly connected to the piston 305, it will cause the problem of jamming of the fork 302 and the locking sleeve 303. Therefore, the rod end of the piston 305 is in the shape of a ball head, and the inner part of the sleeve of the fork 302 is in the structure of a spherical cavity, so that the fork 302 has a certain floating ability. When the included angle between the moving direction of the piston 305 and the axis of the half shaft is within the allowable error range, the fork 302 and the locking sleeve 303 will not jam.

[0075] In some embodiments, the hole wall of the differential lock mounting hole 201 close to the frame part 1 is an arc surface, and a protrusion adapted to the arc surface is provided on the side of the mounting plate in contact with the second flange connection surface 202;

[0076] Through the structural design of the arc surface and the matching protrusion, it plays a role in preventing misassembly during the installation of the differential lock assembly 3, and avoids the wrong installation direction of the differential lock assembly 3.

[0077] In addition to the electric drive axle housing disclosed in each of the above embodiments, the present invention also provides an automobile including the above electric drive axle housing. For the structures of other parts of the bicycle, please refer to the prior art and will not be elaborated herein.

[0078] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other.

[0079] The above has introduced in detail the electric drive axle housing and the vehicle provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. An electric drive axle housing, characterized in that: It comprises an integrally formed frame portion (1) and a hollow beam portion (2), wherein the inner cavity of the hollow beam portion (2) is in communication with the inner cavity of the frame portion (1); The upper and lower end surfaces of the frame portion (1) are both provided with a first flange connection surface (101); The two groups of hollow beam portions (2) are coaxially arranged at the two ends of the frame portion (1), a differential lock mounting hole (201) is provided through the side wall of one group of the hollow beam portions (2), a second flange connection surface (202) is provided on the outer wall of the differential lock mounting hole (201) corresponding to the hollow beam portion (2), and the second flange connection surface (202) is coplanar with one group of the first flange connection surfaces (101).

2. The electric drive axle housing according to claim 1, characterized in that: The surface of the first flange connection surface (101) is evenly provided with a plurality of groups of threaded blind holes, and the side wall of the frame portion (1) is provided with a penetrating oil injection hole (102).

3. The electric drive axle housing according to claim 1, characterized in that: Also included is a differential lock assembly (3), wherein the differential lock assembly (3) includes a piston cavity (301), a piston (305) and a shift fork (302); The piston cavity (301) passes through the differential lock mounting hole (201) and is fixedly mounted on the second flange connection surface (202). The piston (305) is slidingly sealed and mounted in the piston cavity within the piston cavity (301). The rod of the piston extends to the outside of the piston cavity and a shift fork (302) is provided at the end thereof for rotationally engaging with a locking sleeve (303) in the inner cavity of the hollow beam portion (2).

4. The electric drive axle housing according to claim 3, characterized in that: The piston cavity (301) comprises a cavity portion located inside the hollow beam portion (2) and a mounting plate located outside the hollow beam portion (2); The piston cavity is arranged in the cavity part, and a through hole for the rod body of the piston (305) to pass through is arranged at one end facing the frame part (1); The mounting plate and the second flange connection surface (202) are connected via bolts.

5. The electric drive axle housing according to claim 4, characterized in that: A high-pressure oil hole is provided at one end of the piston cavity away from the through hole, and a spring (306) is provided in the piston cavity for pushing the piston (305) to move toward the end of the piston cavity where the high-pressure oil hole is provided.

6. The electric drive axle housing according to claim 4, characterized in that: The shift fork (302) comprises an integrated sleeve portion and a fork body portion; The sleeve portion is fixedly sleeved on the end of the rod body of the piston (305), and the fork body portion is clamped with the locking sleeve (303).

7. The electric drive axle housing according to claim 6, characterized in that: The outer peripheral surface of the sleeve portion is provided with a wedge-shaped surface along the center line direction thereof, a pressure switch (304) is fixedly arranged in the mounting plate, and a contact of the pressure switch (304) abuts against the wedge-shaped surface; When the piston (305) moves toward one side of the through hole, the wedge surface can push the contact of the pressure switch (304) to retreat, and when the piston (305) moves to the other side, the contact of the pressure switch (304) is reset.

8. The electric drive axle housing according to claim 6, characterized in that: The rod end of the piston (305) is a spherical structure; The inner cavity of the sleeve portion of the shift fork (302) is a spherical cavity adapted to the spherical structure, and the end of the rod body of the piston (305) is threadedly connected with a limit screw to prevent the sleeve portion from being separated from the rod body of the piston (305).

9. The electric drive axle housing according to claim 4, characterized in that: The hole wall of the differential lock mounting hole (201) close to the frame portion (1) is an arc-shaped surface, and a protrusion matching the arc-shaped surface is provided on the side of the mounting plate in contact with the second flange connection surface (202).

10. An automobile, characterized in that: It comprises the electric drive axle housing as described in any one of claims 1-9.

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