Power assembly, drive axle and vehicle

Abstract

The utility model relates to a power assembly, a drive axle and a vehicle, and the power assembly comprises a first motor which comprises a first housing, a first stator and a first rotor; the second motor comprises a second shell, a second stator and a second rotor; wherein the first casing is provided with a first accommodating cavity for accommodating the first stator and the first rotor; the second casing is provided with a second accommodating cavity for accommodating the second stator and the second rotor; the first machine shell and the second machine shell are fixedly connected. The power assembly, the drive axle and the vehicle have the beneficial effects that the shells of the two motors are directly and fixedly connected to reduce the installation space needed by the power assembly.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a powertrain, a drive axle, and a vehicle. Background Art

[0002] In current dual-motor powertrains, the coordinated operation of the two motors optimizes system efficiency under varying operating conditions. In related technologies, the two motors are separately mounted on a connecting frame to form a complete system. However, due to the limited space available in a vehicle, this installation method requires a high level of space. Utility Model Content

[0003] The embodiments of the present application provide a powertrain, a drive axle, and a vehicle, which reduce the installation space required for the powertrain, thereby at least partially solving the above-mentioned technical problems.

[0004] In order to achieve the above objectives, according to a first aspect of the present application, a powertrain is provided, comprising:

[0005] A first motor comprising a first housing, a first stator and a first rotor;

[0006] a second motor comprising a second housing, a second stator, and a second rotor;

[0007] The first housing has a first accommodating cavity for accommodating the first stator and the first rotor; the second housing has a second accommodating cavity for accommodating the second stator and the second rotor; and the first housing and the second housing are fixedly connected.

[0008] Optionally, the powertrain further includes:

[0009] The fastening assembly is used to apply a force to the first housing and the second housing.

[0010] Optionally, the fastening assembly includes one of a clamp, a combination of a bolt and a nut, and a pin.

[0011] Optionally, the first housing includes:

[0012] a first mounting end surface, provided on a side of the first housing facing the second motor;

[0013] The second housing includes:

[0014] a second mounting end surface, provided on a side of the second housing facing the first motor;

[0015] Wherein, the first mounting end surface is in contact with the second mounting end surface.

[0016] Optionally, at least a portion of the fastening assembly passes through the first mounting end surface and the second mounting end surface.

[0017] Optionally, the fastening assembly includes:

[0018] A locking bolt having a shift boss at one end;

[0019] A locking nut is connected to the locking bolt so that the first mounting end surface and the second mounting end surface are locked between the shift boss and the locking nut.

[0020] Optionally, multiple groups of fastening components are arranged at different circumferential positions.

[0021] Optionally, the first motor further includes:

[0022] a first output shaft connected to the first rotor;

[0023] The second motor further includes:

[0024] a second output shaft connected to the second rotor;

[0025] The first output shaft and the second output shaft rotate around the same central axis.

[0026] Optionally, at least a portion of the first mounting end surface intersects the central axis perpendicularly or obliquely; and / or

[0027] At least a portion of the second mounting end surface intersects the central axis perpendicularly or obliquely.

[0028] Optionally, in the circumferential direction of the central axis, the first mounting end surface and the second mounting end surface are in contact at different positions in the circumferential direction.

[0029] Optionally, a plurality of the first mounting end surfaces are spaced apart in the circumferential direction, and a plurality of the second mounting end surfaces are spaced apart in the circumferential direction.

[0030] Optionally, the fastening assembly includes:

[0031] The clamp is sleeved on at least a portion of the first housing and at least a portion of the second housing to lock the first mounting end surface and the second mounting end surface.

[0032] Optionally, the first housing has a first positioning structure, and the second housing has a second positioning structure matched with the first positioning structure, so as to define the relative positions of the first housing and the second housing in the radial direction.

[0033] Optionally, the first positioning structure is constructed as follows:

[0034] A matching groove is provided on a side of the first housing close to the second motor;

[0035] The second positioning structure is constructed as follows:

[0036] a matching protrusion, provided on a side of the second housing close to the first motor;

[0037] Wherein, at least a portion of the mating protrusion is embedded in the mating groove, and the mating protrusion abuts against the inner side wall of the mating groove.

[0038] Optionally, the first housing includes:

[0039] First sleeve;

[0040] a first end cover connected to the axial side of the first sleeve so that the first sleeve and the first end cover enclose the first accommodating chamber;

[0041] Wherein, the first mounting end surface is formed on the first end cover; and / or

[0042] The second housing includes:

[0043] Second sleeve;

[0044] a second end cover connected to the axial side of the second sleeve so that the second sleeve and the second end cover together form the second accommodating cavity;

[0045] Wherein, the second mounting end surface is formed on the second end cover.

[0046] According to a second aspect of the present application, a drive axle is provided, comprising: the power assembly as described above.

[0047] Optionally, the drive axle includes:

[0048] A connecting seat body, used for connecting to a mast of a vehicle;

[0049] Wherein, the power assembly is located between the two connecting seat bodies.

[0050] Optionally, the drive axle further includes:

[0051] a drive shaft for transmitting power between the powertrain and the wheels;

[0052] a braking device, for providing braking force to the transmission shaft;

[0053] Wherein, the braking device is connected to the transmission shaft.

[0054] Optionally, the first output shaft of the first motor and the second output shaft of the second motor are respectively connected to the transmission shaft in a rotationally fixed manner.

[0055] Optionally, the braking device includes:

[0056] a brake seat, fixedly connected to the first housing or the second housing;

[0057] Wherein, the brake seat has or is connected with:

[0058] The connecting seat is used to connect to the mast of the vehicle.

[0059] Optionally, the braking device includes:

[0060] a friction plate pack configured to brake the transmission shaft under pressure,

[0061] a service brake piston, for providing or releasing a first pressure to the friction plate group;

[0062] Driving elastic member, used to release or provide the first pressure

[0063] a parking brake piston, used for releasing or providing a second pressure to the friction plate group;

[0064] a parking elastic member, configured to provide or release the second pressure;

[0065] Wherein, the friction plate group is coupled to the transmission shaft, the service elastic member is coupled to the service brake piston, and the parking elastic member is coupled to the parking brake piston.

[0066] Optionally, the braking device includes:

[0067] A brake seat having an inner seat space;

[0068] Wherein, the service brake piston and the parking brake piston are respectively arranged in the space inside the seat;

[0069] A service brake piston cavity is formed between the service brake piston and the brake seat, and the service brake piston slides relative to the brake seat when the service brake piston cavity is filled with oil or drained with oil;

[0070] A parking piston cavity is formed between the parking brake piston and the brake seat, and the parking brake piston slides relative to the brake seat when the parking piston cavity is filled with oil or drained of oil.

[0071] Optionally, the brake seat includes:

[0072] an outer shell, fixedly connected to the first housing or the second housing;

[0073] a first base body, the service brake piston being in sliding connection with the first base body;

[0074] a second base body, the parking brake piston being in sliding connection with the second base body;

[0075] The first base and the second base are both installed in the outer shell;

[0076] The braking device comprises:

[0077] a stopper, for limiting the position of the first base body and / or the second base body relative to the outer shell in the axial direction of the transmission shaft in an abutting manner;

[0078] Wherein, the stopper is coupled to the outer shell.

[0079] Optionally, the outer shell has an axial inner wall and a circumferential inner wall; in the axial direction of the transmission shaft, one side of the second base abuts against the axial inner wall, one side of the first base abuts against the other side of the second base, and the other side of the first base abuts against the stopper.

[0080] Optionally, the stopper is constructed as an annular structure, and at least a portion of the stopper is embedded in the circumferential inner wall.

[0081] According to a third aspect of the present application, a vehicle is also provided, comprising the powertrain or drive axle described above.

[0082] The beneficial effect of the present application is that it provides a powertrain, a drive axle and a vehicle that are directly fixedly connected by the casings of two motors to reduce the installation space required for the powertrain.

[0083] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0084] By fixedly connecting the first housing and the second housing, the installation space required for the power assembly can be reduced, thereby improving the adaptability of the power assembly.

[0085] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0087] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0088] Figure 1 is a schematic diagram of the overall structure of a drive axle provided in an exemplary embodiment of the present application;

[0089] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0090] Figure 3 is an internal cross-sectional view of a drive axle provided in an exemplary embodiment of the present application;

[0091] Figure 4 is an internal cross-sectional view of a powertrain provided in an exemplary embodiment of the present application;

[0092] Figure 5 yes Figure 4 An enlarged schematic diagram of part B;

[0093] Figure 6 is an internal cross-sectional view of a brake device in a drive axle provided in an exemplary embodiment of the present application;

[0094] Figure 7 yes Figure 6 A magnified schematic diagram of part C;

[0095] Figure 8 1 is an internal cross-sectional view of a speed reduction mechanism in a drive axle provided in an exemplary embodiment of the present application.

[0096] Description of reference numerals:

[0097] 100. Powertrain;

[0098] 110, first motor; 111, first housing; 111a, first sleeve; 111b, first end cover; 111c, first mounting portion; 111d, first mounting end surface; 111e, mating groove;

[0099] 112. First stator; 113. First rotor; 114. First output shaft;

[0100] 120, second motor; 121, second housing; 121a, second sleeve; 121b, second end cover; 121c, second mounting portion; 121d, second mounting end surface; 121e, mating protrusion;

[0101] 122. Second stator; 123. Second rotor; 124. Second output shaft;

[0102] 130, fastening assembly; 131, locking bolt; 131a, shift boss; 132, locking nut;

[0103] 141. First drive controller; 142. Second drive controller;

[0104] C1, central axis;

[0105] 10. Drive axle;

[0106] 211, transmission shaft; 212, coupling;

[0107] 300, brake device; 310, brake seat; 311, outer shell; 311a, axial inner wall; 311b, circumferential inner wall; 312, first base; 313, second base; 314, connecting seat; 310a, seat interior space;

[0108] 320, friction plate group; 321, first friction plate; 322, second friction plate; 323, guide pin; 324, reset member;

[0109] 331. Service brake piston; 332. Service elastic member; 333. Parking brake piston; 334. Parking elastic member; 335. Step bolt;

[0110] 330a, driving piston chamber; 330b, parking piston chamber;

[0111] 341, first liquid exchange connector; 342, second liquid exchange connector; 343, ventilation connector;

[0112] 351, stopper; 352, synchronizing member;

[0113] 400, reduction mechanism; 410, reduction shaft; 420, primary driven gear; 430, reduction housing; 440, ring gear; 450, sun gear; 460, planetary gear; 470, planet carrier; 480, hub shaft; 211a, primary driving gear. DETAILED DESCRIPTION

[0114] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0115] According to the first aspect of this application, referring to Figure 1 、 Figure 2 and Figure 4 The present application provides a powertrain 100 , including: a first motor 110 and a second motor 120 .

[0116] The first motor 110 includes a first housing 111, a first stator 112, and a first rotor 113. The first housing 111 has a first accommodating cavity for accommodating the first stator 112 and the first rotor 113. The connection and operating principles of the first stator 112, the first rotor 113, and the first housing 111 are based on existing technologies and will not be further described here. The second motor 120 includes a second housing 121, a second stator 122, and a second rotor 123. The second housing 121 has a second accommodating cavity for accommodating the second stator 122 and the second rotor 123. The connection and operating principles of the second stator 122, the second rotor 123, and the second housing 121 are based on existing technologies and will not be further described here.

[0117] The first housing 111 and the second housing 121 are fixedly connected. It is understood that the first housing 111 and the second housing 121 can be fixed by welding or detachable connection.

[0118] Through the above technical solution, by fixing the first housing 111 and the second housing 121 together, the installation space required for the power assembly 100 can be reduced, thereby improving the adaptability of the power assembly 100.

[0119] In some embodiments, reference Figure 1 and Figure 2 The power assembly 100 further includes: a fastening assembly 130 .

[0120] The fastening assembly 130 is used to apply force to the first housing 111 and the second housing 121 to make the first mounting end surface 111d and the second mounting end surface 121d contact each other. The fastening assembly 130 provides a stable connection between the first housing 111 and the second housing 121, improving load-bearing capacity and reliability.

[0121] It is understandable that the fastening assembly 130 includes a combination of bolts and nuts, or a clamp or a pin connection, etc., which is not limited to this.

[0122] In some embodiments, reference Figure 1 、 Figure 2 and Figure 4 The first housing 111 includes a first mounting end surface 111 d. The first mounting end surface 111 d is disposed on a side of the first housing 111 facing the second motor 120.

[0123] The second housing 121 includes a second mounting end surface 121d. The second mounting end surface 121d is disposed on a side of the second housing 121 facing the first motor 110. The first mounting end surface 111d and the second mounting end surface 121d are in contact with each other.

[0124] With this solution, the first housing 111 and the second housing 121 are directly fixed to each other through the contact between the first mounting end surface 111 d and the second mounting end surface 121 d , and the mutual positioning of the first housing 111 and the second housing 121 is facilitated.

[0125] In some embodiments, reference Figure 1 and Figure 2 At least a portion of the fastening assembly 130 is disposed through the first mounting end surface 111d and the second mounting end surface 121d. Thus, the spatial position of the first mounting end surface 111d and the second mounting end surface 121d is utilized to achieve the arrangement of the fastening assembly 130, thereby reducing the additional space occupied by the fastening assembly 130.

[0126] In some embodiments, reference Figure 1 and Figure 2 The fastening assembly 130 includes a locking bolt 131 and a locking nut 132 .

[0127] The locking bolt 131 has a shifting boss 131a at one end and is disposed through the first and second mounting end surfaces 111d, 121d. A locking nut 132 is connected to the locking bolt to lock the first and second mounting end surfaces 111d, 121d between the shifting boss 131a and the locking nut 132.

[0128] With this solution, the first housing 111 and the second housing 121 are locked by the cooperation of the locking bolt 131 and the locking nut 132 , which facilitates installation.

[0129] It is understandable that the fastening assembly 130 may further include a gasket to achieve effects such as increasing the contact area and preventing loosening.

[0130] In some embodiments, reference Figure 1 and Figure 2 , multiple sets of fastening assemblies 130 are arranged at different circumferential positions. This solution provides locking forces at different circumferential positions by providing multiple sets of fastening assemblies 130, thereby improving the stability and reliability of the connection between the first housing 111 and the second housing 121, thereby improving the load-bearing capacity.

[0131] In some embodiments, reference Figure 2 and Figure 3 The first motor 110 further includes a first output shaft 114 connected to the first rotor 113. The second motor 120 further includes a second output shaft 124 connected to the second rotor 123. The first output shaft 114 and the second output shaft 124 rotate about the same central axis C1.

[0132] With such a solution, the first output shaft 114 and the second output shaft 124 rotate around the same central axis C1 , thereby reducing the radial arrangement space required for the first motor 110 and the second motor 120 .

[0133] In some embodiments, reference Figures 1 to 4 At least a portion of the first mounting end surface 111d intersects the central axis C1 perpendicularly or obliquely; at least a portion of the second mounting end surface 121d intersects the central axis C1 perpendicularly or obliquely.

[0134] It can be understood that the first mounting end face 111d and the second mounting end face 121d are both perpendicular to the central axis C1; or, the first mounting end face 111d and the second mounting end face 121d are both obliquely intersecting with the central axis C1, that is, the shapes of the first mounting end face 111d and the second mounting end face 121d are matching conical surfaces; or, a part of the first mounting end face 111d and the second mounting end face 121d is perpendicular to the central axis C1, and the other part is obliquely intersecting with the central axis C1, which can simultaneously achieve axial positioning and radial positioning.

[0135] By adopting such a solution, the first housing 111 and the second housing 121 are positioned in the axial direction through the cooperation between the first mounting end surface 111 d and the second mounting end surface 121 d .

[0136] In some embodiments, reference Figure 1 and Figure 2 In the circumferential direction of the central axis C1, the first mounting end surface 111d and the second mounting end surface 121d contact each other at different circumferential positions. This ensures stable contact between the first housing 111 and the second housing 121 at different circumferential positions, thereby improving the connection stability.

[0137] It can be understood that the first mounting end surface 111d and the second mounting end surface 121d can be continuous structural surfaces in the circumferential direction, or can be arranged in different areas in the circumferential direction.

[0138] In some embodiments, reference Figure 1 and Figure 2 , multiple first mounting end surfaces 111d are arranged at intervals in the circumferential direction, and multiple second mounting end surfaces 121d are arranged at intervals in the circumferential direction.

[0139] For example, the first housing 111 is provided with first mounting portions 111c at different axial positions. The first mounting portions 111c protrude radially, and a first mounting end surface 111d is formed on the first mounting portions 111c. The second housing 121 is provided with second mounting portions 121c at different axial positions. The second mounting portions 121c protrude radially, and a second mounting end surface 121d is formed on the second mounting portions 121c. The first mounting portions 111c and the second mounting portions 121c correspond one-to-one. Accordingly, the fastening assembly 130 is connected to the first mounting portion 111c and the second mounting portion 121c.

[0140] With this solution, the first mounting end face 111d and the second mounting end face 121d are spaced apart in the circumferential direction, which reduces the matching area between the first mounting end face 111d and the second mounting end face 121d, thereby reducing the difficulty of end face processing.

[0141] In some embodiments, the fastening assembly includes a clamp, which is sleeved on at least a portion of the first housing and at least a portion of the second housing to lock the first mounting end surface and the second mounting end surface.

[0142] It can be understood that the position of the clamp corresponds to the contact point between the first mounting end surface and the second mounting end surface. By applying a circumferential locking force, the first and second housings can be quickly positioned circumferentially. More specifically, the first and second housings each have a wedge-shaped surface that mates with the clamp. During the clamp's locking process, the wedge-shaped surfaces engage, causing the clamp to apply opposite axial locking forces to the two housings, thereby achieving axial locking.

[0143] In some embodiments, reference Figure 4 and Figure 5 The first housing 111 has a first positioning structure, and the second housing 121 has a second positioning structure matched with the first positioning structure to define the relative positions of the first housing 111 and the second housing 121 in the radial direction.

[0144] By adopting such a solution, through the setting of the first positioning structure and the second positioning structure, the radial mutual positioning is achieved by utilizing the inherent structure of the first housing 111 and the second housing 121, and the radial misalignment of the first housing 111 and the second housing 121 caused by vibration and other reasons during the working process can be reduced, thereby reducing the shear force on the fastening component 130 and ensuring the stability and reliability of the connection.

[0145] In some embodiments, reference Figure 4 and Figure 5The first positioning structure is configured as a mating groove 111e. The mating groove 111e is provided on a side of the first housing 111 close to the second motor 120. The second positioning structure is configured as a mating protrusion 121e. The mating protrusion 121e is provided on a side of the second housing 121 close to the first motor 110. At least a portion of the mating protrusion 121e is embedded in the mating groove 111e, and the mating protrusion 121e abuts against the inner sidewall of the mating groove 111e.

[0146] It is understandable that the first positioning structure may be configured to fit the protrusion 121e, and the second positioning structure may be configured to fit the groove 111e.

[0147] With such a solution, by providing the matching protrusion 121e and the matching groove 111e, the first motor 110 and the second motor 120 can be quickly positioned during the assembly process, thereby improving assembly efficiency.

[0148] In some embodiments, reference Figures 1 to 4 The first housing 111 includes a first sleeve 111a and a first end cap 111b. The first end cap 111b is connected to the axial side of the first sleeve 111a, so that the first sleeve 111a and the first end cap 111b together form a first accommodating chamber. The first output shaft 114 is rotatably supported by the first sleeve 111a and the first end cap 111b. A first mounting end surface 111d is formed on the first end cap 111b.

[0149] The second housing 121 includes a second sleeve 121a and a second end cap 121b. The second end cap 121b is connected to the axial side of the second sleeve 121a, forming a second accommodating chamber. The second output shaft 124 is rotatably supported by the second sleeve 121a and the second end cap 121b. A second mounting end surface 121d is formed on the second end cap 121b.

[0150] In some embodiments, reference Figure 1 and Figure 4 The powertrain 100 further includes a first drive controller 141 and a second drive controller 142 . The first drive controller 141 is fixedly connected to the first housing 111 and is used to control the operation of the first motor 110 . The second drive controller 142 is fixedly connected to the second housing 121 and is used to control the operation of the second motor 120 .

[0151] According to the second aspect of this application, referring to Figure 1 and Figure 3 , providing a drive axle 10, which includes the above-mentioned power assembly 100. The drive axle 10 has all the beneficial effects of the above-mentioned power assembly 100, which will not be described in detail in this application.

[0152] In some embodiments, reference Figure 1 The drive axle 10 includes a connecting seat 314 . The connecting seat 314 is used to connect to the mast of the vehicle; the powertrain 100 is located between the two connecting seats 314 .

[0153] By adopting such a solution, a connecting seat 314 is provided on the driving axle 10 for connecting to a mast of a vehicle (eg, a mast of a forklift), thereby obtaining a smaller front overhang and a higher load-bearing capacity.

[0154] Illustratively, the connection seat body 314 may be at least a portion of a bearing seat.

[0155] In some embodiments, reference Figure 1 、 Figure 3 and Figure 6 The drive axle 10 further includes: a transmission shaft 211 and a braking device 300 .

[0156] The transmission shaft 211 is used to transmit power between the powertrain 100 and the wheels; the braking device 300 is connected to the transmission shaft 211 and is used to provide braking force to the transmission shaft 211.

[0157] It is understood that the transmission shaft 211 can be a primary shaft or a secondary shaft. The primary shaft can be understood to have a rotational speed similar to or the same as the motor output shaft. For example, the primary shaft is connected to the motor output shaft via a coupling 212. The coupling 212 can be a spline sleeve. The secondary shaft undergoes at least one reduction in speed relative to the primary shaft.

[0158] The braking device 300 can realize at least one of a service braking function and a parking braking function.

[0159] In some embodiments, reference Figure 3 and Figure 6 The first output shaft 114 of the first motor 110 and the second output shaft 124 of the second motor 120 are respectively connected to the transmission shaft 211 in a fixed manner. In other words, the transmission shaft 211 is connected to both sides of the power assembly 100.

[0160] It can be understood that in this embodiment, the transmission shaft 211 is a primary shaft.

[0161] By adopting such a solution, the braking device 300 is integrated into the transmission shaft 211 , that is, the service braking function and the parking braking function are integrated into the transmission shaft 211 , thereby improving the structural compactness of the braking device 300 and increasing the braking response speed.

[0162] In some embodiments, reference Figure 3 and Figure 6The brake device 300 includes a brake seat 310. The brake seat 310 is fixedly connected to the first housing 111 or the second housing 121; the brake seat 310 has or is connected to a connecting seat body 314, and the connecting seat body 314 is used to be connected to the mast of the vehicle.

[0163] By adopting such a solution, since braking devices 300 are respectively provided on both sides of the power assembly 100, by setting the connecting seat body 314 on the brake seat 310, the installation spacing between the brake seats 310 on both sides of the power assembly 100 can be used as the arrangement distance of the two connecting seat bodies 314, thereby meeting the installation requirements of the gantry without the need to set up additional brackets.

[0164] In some embodiments, reference Figure 3 、 Figure 6 and Figure 7 The braking device 300 includes: a friction plate group 320, a service brake piston 331, a service elastic member 332, a parking brake piston 333 and a parking elastic member 334.

[0165] The friction plate group 320 is coupled to the transmission shaft 211 , and the friction plate group 320 is configured to brake the transmission shaft 211 under pressure.

[0166] The service brake piston 331 is used to apply or release a first pressure to the friction plate pack 320. The service spring 332 is coupled to the service brake piston 331 and is used to release or apply the first pressure. It is understood that one of the service brake piston 331 and the service spring 332 applies the first pressure to the friction plate pack 320 to generate a service braking force, while the other releases the first pressure.

[0167] Exemplarily, the service spring 332 is a compression spring and is positioned on the side of the service brake piston 331 closest to the friction plate pack 320. The service brake piston 331 provides a first pressure, while the service spring 332 biases the service brake piston 331, causing it to move away from the friction plate pack 320. The service spring 332 is mounted on a stepped bolt 335 to maintain its shape. The stepped bolt 335 passes through the service brake piston and is fixedly connected to the first base 312.

[0168] The parking brake piston 333 is used to apply or remove the second pressure to the friction plate group 320. The parking spring 334 is coupled to the parking brake piston 333 and is used to apply or remove the second pressure. It is understood that one of the parking brake piston 333 and the parking spring 334 applies the second pressure to the friction plate group 320 to generate the parking brake force, while the other is used to remove the second pressure.

[0169] Exemplarily, the parking elastic member 334 is a compression spring and is disposed on a side of the parking brake piston 333 away from the friction plate assembly 320. The parking elastic member 334 provides a first pressure, which acts on the friction plate assembly 320 via the parking brake piston 333. Specifically, one end of the parking elastic member 334 abuts the parking brake piston 333, and the other end abuts the first base 312.

[0170] With the above braking solution, the service brake piston 331 and the parking brake piston 333 act on the same friction plate group 320 , thereby reducing the number of friction plate groups 320 .

[0171] In some embodiments, reference Figure 3 、 Figure 6 and Figure 7 The brake seat 310 has an inner space 310 a; the service brake piston 331 and the parking brake piston 333 are respectively arranged in the inner space 310 a of the seat.

[0172] A service piston chamber 330 a is formed between the service brake piston 331 and the brake seat 310 . The service brake piston 331 slides relative to the brake seat 310 when the service piston chamber 330 a is filled with oil or drained with oil.

[0173] When the service piston chamber 330a is filled with oil, the service brake piston 331, under the action of the hydraulic oil, applies a first pressure, compressing the service spring element 332 while simultaneously pressing against the friction plate assembly 320, thereby applying the service brake. When the service piston chamber 330a is drained of oil, the hydraulic oil pressure in the chamber 330a is released, and the service brake piston 331, under the elastic action of the service spring element 332, moves away from the friction plate assembly 320, ultimately releasing the service brake.

[0174] A parking piston chamber 330 b is formed between the parking brake piston 333 and the brake seat 310 . The parking brake piston 333 slides relative to the brake seat 310 when the parking piston chamber 330 b is filled with oil or drained with oil.

[0175] When the parking piston chamber 330b leaks oil, the parking brake piston 333 moves toward the friction plate group 320 under the action of the second pressure provided by the parking elastic member 334. As the hydraulic oil continues to be released, the parking brake piston 333 presses the friction plate group 320 to generate a parking braking force, thereby playing a parking brake role.

[0176] When the parking piston chamber 330b is filled with oil, the parking brake piston 333 moves away from the friction plate group 320 under the pressure of the hydraulic oil. As the parking elastic member 334 continues to be compressed, the pressure of the parking brake piston 333 on the friction plate group 320 continues to decrease, and the parking is finally released.

[0177] In some embodiments, reference Figure 1 The braking device 300 also includes a first fluid exchange connector 341 , a second fluid exchange connector 342 and a ventilation connector 343 .

[0178] The first fluid exchange connector 341 is fixedly connected to the brake base 310 and is used to connect the service piston chamber 330a to an external pipeline. The second fluid exchange connector 342 is fixedly connected to the brake base 310 and is used to connect the parking piston chamber 330b to an external pipeline. The ventilation connector 343 is connected to the service piston chamber 330a and is used to at least exhaust the service piston chamber 330a.

[0179] In some embodiments, reference Figure 6 and Figure 7 The brake seat 310 includes an outer shell 311 , a first base 312 and a second base 313 .

[0180] The outer housing 311 is fixedly connected to the first housing 111 or the second housing 121, and the first base 312 and the second base 313 are both mounted within the outer housing 311. The service brake piston 331 is slidably connected to the first base 312, supporting the service brake piston 331 and improving its stability during movement. The parking brake piston 333 is slidably connected to the second base 313, improving its stability during movement. The first base 312 and the second base 313 respectively support the service brake piston 331 and the parking brake piston 333, preventing mutual interference and simplifying assembly.

[0181] The braking device 300 includes a stopper 351 . The stopper 351 is coupled to the outer shell 311 and is used to limit the position of the first base 312 and / or the second base 313 relative to the outer shell 311 in the axial direction of the transmission shaft 211 in an abutting manner.

[0182] It can be understood that at least one of the first base 312 and the second base 313 cooperates with the stopper 351 .

[0183] The stopper 351 is provided to limit the positions of the first base 312 and the second base 313 on the housing, thereby ensuring that the service brake piston 331 and the parking brake piston 333 can be stably supported.

[0184] In some embodiments, reference Figure 6 and Figure 7The outer shell 311 has an axial inner wall 311a and a circumferential inner wall 311b; in the axial direction of the transmission shaft 211, one side of the second base 313 abuts against the axial inner wall 311a, one side of the first base 312 abuts against the other side of the second base 313, and the other side of the first base 312 abuts against the stopper 351.

[0185] By adopting such a solution, by combining the structural design of the outer shell 311 and the abutment fit between the first base 312 and the second base 313 , only one stopper 351 is required to realize the installation of the first base 312 and the second base 313 , thereby improving the convenience of assembly.

[0186] In some embodiments, reference Figure 6 and Figure 7 The stopper 351 is constructed as an annular structure, and at least a portion of the stopper 351 is embedded in the circumferential inner wall 311b. Exemplarily, the stopper 351 is a retaining ring.

[0187] By adopting such a stopper 351 structure, it is only necessary to set a groove that cooperates with the stopper 351 on the inner wall 311b of the outer shell 311 to achieve the installation of the first base 312 and the second base 313. While simplifying the installation method, it ensures the structural rigidity of the outer shell 311 and improves the load-bearing capacity of the drive axle 10.

[0188] As a specific solution, refer to Figures 6 and 7 The friction plate group 320 includes first friction plates 321 and second friction plates 322. The first friction plates 321 are each fixedly connected to the brake base 310 and are axially slidable relative to the brake base 310. The second friction plates 322 are each fixedly connected to the transmission shaft 211 and are axially slidable relative to the transmission shaft 211. The first friction plates 321 and the second friction plates 322 are configured to brake the transmission shaft 211 through friction.

[0189] The friction plate group 320 also includes guide pins 323 and reset members 324. The guide pins 323 connect the plurality of first friction plates 321 in series. One end of the guide pins 323 is inserted into the outer shell 311, and the other end is inserted into the second base 313. The guide pins 323 guide the sliding movement of the first friction plates 321 and prevent rotation between the first friction plates 321 and the brake seat 310. The reset members 324 are positioned between adjacent first friction plates 321. When pressure on the friction plate group 320 is released, the reset members 324 can separate the first and second friction plates 321, 322, preventing friction plate slip.

[0190] The second friction plate 322 is locked in rotation with the transmission shaft 211 through a synchronizer 352 , which can be a spline sleeve.

[0191] Optionally, the first friction plate 321 is a steel plate, and the material of the first friction plate 321 includes at least one of asbestos material, NAO friction material (Non-Asbestos Organic, asbestos-free organic brake pad), semi-metallic material, ceramic material, powder metallurgy friction material (sintered friction material), carbon fiber friction material, etc.

[0192] Exemplarily, the reset member 324 is a compression spring, and the reset member 324 is sleeved on the guide pin 323 .

[0193] This application exemplarily describes the working process of the braking device 300:

[0194] When service braking is required, hydraulic oil enters the service piston chamber 330a from the first fluid exchange joint 341. As the hydraulic pressure of the service piston chamber 330a continues to increase, the service brake piston 331 overcomes the elastic force of the service elastic member 332 and presses the friction plate group 320 to achieve service braking.

[0195] When the service brake needs to be released, the hydraulic pressure in the service piston chamber 330a is released, and the service brake piston 331 moves away from the friction plate group 320 under the action of the service elastic member 332. At this time, the reset member 324 separates the friction plates and releases the service brake.

[0196] When parking brake is required, the hydraulic oil in the parking piston chamber 330b is discharged along the second fluid exchange joint 342. Under the action of the parking elastic member 334, the parking brake piston 333 presses the friction plate group 320 to achieve parking brake.

[0197] When the parking brake needs to be released, the hydraulic oil enters the parking piston chamber 330b from the second fluid exchange joint 342. After the parking piston chamber 330b is subjected to the liquid pressure, it pushes the parking brake piston 333 to move in the direction of compressing the parking elastic member 334; as the hydraulic oil continues to enter, the second pressure applied by the parking elastic member 334 is released. At this time, the reset member 324 separates the friction plates and releases the parking brake.

[0198] In some embodiments, reference Figure 1 、 Figure 3 and Figure 8 The drive axle 10 further includes a reduction mechanism 400 . The reduction mechanism 400 includes a reduction shaft 410 , a reduction housing 430 , a sun gear 450 , planetary gears 460 , a planet carrier 470 and a hub shaft 480 .

[0199] The transmission shaft 211 has or is connected to a primary driving gear 211a. The reduction shaft 410 is fixedly connected to a primary driven gear 420 that meshes with the primary driving gear 211a. The reduction housing 430 is fixedly connected to the brake seat 310 and defines a reduction chamber within it. The sun gear 450, planetary gears 460, and planetary carrier 470 are all located within the reduction chamber. A ring gear 440 is also connected to or is located on the inner wall of the reduction housing 430. The sun gear 450 and the reduction shaft 410 are fitted with an interference fit or a spline fit to achieve a fixed rotation fit. After power is reduced by the primary driving gear 211a and the primary driven gear 420, it is transmitted to the sun gear 450, which then rotates synchronously with the reduction shaft 410. A plurality of planetary gears 460 are provided, spaced apart circumferentially around the sun gear 450 and meshing with both the sun gear 450 and the ring gear 440. The planetary gears 460 are rotatably connected to the planetary carrier 470 via planetary shafts. The hub shaft 480 is rotatably connected to the housing and is non-rotatably connected to the planet carrier 470. The power is output by the hub shaft 480, and the hub shaft 480 is used to be connected to the wheels, thereby driving the wheels to transmit power.

[0200] In the examples of this application, refer to Figure 1 and Figure 3 The powertrain 100 drives different wheels via two driving force transmission routes, and the two driving force transmission routes are consistent. In addition, the brake device 300 and the speed reduction mechanism 400 can be installed independently, making maintenance more convenient.

[0201] According to a third aspect of the present application, a vehicle is provided, which includes the powertrain 100 or the drive axle 10 described above, and has all the beneficial effects of the powertrain 100 or the drive axle 10 described above, which are not described in detail herein. For example, the vehicle may be a forklift.

[0202] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0203] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0204] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other unless there is any conflict.

[0205] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A powertrain, characterized in that: include: A first motor comprising a first housing, a first stator and a first rotor; a second motor comprising a second housing, a second stator, and a second rotor; The first housing has a first accommodating cavity for accommodating the first stator and the first rotor; the second housing has a second accommodating cavity for accommodating the second stator and the second rotor; and the first housing and the second housing are fixedly connected.

2. The powertrain according to claim 1, characterized in that: The powertrain further includes: The fastening assembly is used to apply a force to the first housing and the second housing.

3. The powertrain according to claim 2, characterized in that: The fastening assembly includes one of a clamp, a combination of a bolt and a nut, and a pin.

4. The powertrain according to claim 3, characterized in that: The first housing includes: a first mounting end surface, provided on a side of the first housing facing the second motor; The second housing includes: a second mounting end surface, provided on a side of the second housing facing the first motor; Wherein, the first mounting end surface is in contact with the second mounting end surface.

5. The powertrain according to claim 4, characterized in that: At least a portion of the fastening assembly passes through the first mounting end surface and the second mounting end surface.

6. The powertrain according to claim 5, characterized in that: The fastening assembly comprises: A locking bolt having a shift boss at one end; A locking nut is connected to the locking bolt so that the first mounting end surface and the second mounting end surface are locked between the shift boss and the locking nut.

7. The powertrain according to claim 5, characterized in that: The plurality of fastening components are arranged at different circumferential positions.

8. The powertrain according to claim 4, characterized in that: The first motor further includes: a first output shaft connected to the first rotor; The second motor further includes: a second output shaft connected to the second rotor; The first output shaft and the second output shaft rotate around the same central axis.

9. The powertrain according to claim 8, characterized in that: At least a portion of the first mounting end surface intersects the central axis perpendicularly or obliquely; and / or At least a portion of the second mounting end surface intersects the central axis perpendicularly or obliquely.

10. The powertrain according to claim 9, characterized in that: In the circumferential direction of the central axis, the first mounting end surface and the second mounting end surface are in contact at different positions in the circumferential direction.

11. The powertrain according to claim 10, characterized in that: The plurality of first mounting end surfaces are spaced apart in the circumferential direction, and the plurality of second mounting end surfaces are spaced apart in the circumferential direction.

12. The powertrain according to claim 4, characterized in that: The fastening assembly comprises: The clamp is sleeved on at least a portion of the first housing and at least a portion of the second housing to lock the first mounting end surface and the second mounting end surface.

13. The power assembly according to any one of claims 1 to 12, characterized in that: The first housing has a first positioning structure, and the second housing has a second positioning structure matched with the first positioning structure to define the relative positions of the first housing and the second housing in the radial direction.

14. The powertrain according to claim 13, characterized in that: The first positioning structure is constructed as follows: A matching groove is provided on a side of the first housing close to the second motor; The second positioning structure is constructed as follows: a matching protrusion, provided on a side of the second housing close to the first motor; Wherein, at least a portion of the mating protrusion is embedded in the mating groove, and the mating protrusion abuts against the inner side wall of the mating groove.

15. The power assembly according to any one of claims 4 to 12, characterized in that: The first housing includes: First sleeve; a first end cover connected to the axial side of the first sleeve so that the first sleeve and the first end cover enclose the first accommodating chamber; Wherein, the first mounting end surface is formed on the first end cover; and / or The second housing includes: Second sleeve; a second end cover connected to the axial side of the second sleeve so that the second sleeve and the second end cover together form the second accommodating cavity; Wherein, the second mounting end surface is formed on the second end cover.

16. A drive axle, characterized in that: include: A powertrain according to any one of claims 1 to 15.

17. The drive axle according to claim 16, characterized in that: The drive axle comprises: A connecting seat body, used for connecting to a mast of a vehicle; Wherein, the power assembly is located between the two connecting seat bodies.

18. The drive axle according to any one of claims 16 to 17, characterized in that: The drive axle further includes: a drive shaft for transmitting power between the powertrain and the wheels; a braking device, for providing braking force to the transmission shaft; Wherein, the braking device is connected to the transmission shaft.

19. The drive axle according to claim 18, characterized in that: The first output shaft of the first motor and the second output shaft of the second motor are respectively connected to the transmission shaft in a rotationally fixed manner.

20. The drive axle according to claim 18, wherein: The braking device comprises: a brake seat, fixedly connected to the first housing or the second housing; Wherein, the brake seat has or is connected with: The connecting seat is used to connect to the mast of the vehicle.

21. The drive axle according to claim 18, characterized in that: The braking device comprises: a friction plate pack configured to brake the transmission shaft under pressure, a service brake piston, for providing or releasing a first pressure to the friction plate group; Driving elastic member, used to release or provide the first pressure a parking brake piston, used for releasing or providing a second pressure to the friction plate group; a parking elastic member, configured to provide or release the second pressure; Wherein, the friction plate group is coupled to the transmission shaft, the service elastic member is coupled to the service brake piston, and the parking elastic member is coupled to the parking brake piston.

22. The drive axle according to claim 21, characterized in that: The braking device comprises: A brake seat having an inner seat space; Wherein, the service brake piston and the parking brake piston are respectively arranged in the space inside the seat; A service brake piston cavity is formed between the service brake piston and the brake seat, and the service brake piston slides relative to the brake seat when the service brake piston cavity is filled with oil or drained with oil; A parking piston cavity is formed between the parking brake piston and the brake seat, and the parking brake piston slides relative to the brake seat when the parking piston cavity is filled with oil or drained of oil.

23. The drive axle according to claim 22, characterized in that: The brake seat comprises: an outer shell, fixedly connected to the first housing or the second housing; a first base body, the service brake piston being in sliding connection with the first base body; a second base body, the parking brake piston being in sliding connection with the second base body; The first base and the second base are both installed in the outer shell; The braking device comprises: a stopper, for limiting the position of the first base body and / or the second base body relative to the outer shell in the axial direction of the transmission shaft in an abutting manner; Wherein, the stopper is coupled to the outer shell.

24. The drive axle according to claim 23, characterized in that: The outer shell has an axial inner wall and a circumferential inner wall; in the axial direction of the transmission shaft, one side of the second base abuts against the axial inner wall, one side of the first base abuts against the other side of the second base, and the other side of the first base abuts against the stopper.

25. The drive axle according to claim 24, characterized in that: The stopper is configured as an annular structure, and at least a portion of the stopper is embedded in the circumferential inner wall.

26. A vehicle, characterized in that: The invention comprises the powertrain according to any one of claims 1 to 15 or the drive axle according to any one of claims 16 to 25.

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