Brake device, drive axle and vehicle

Abstract

The utility model relates to a brake device, a drive axle and a vehicle, and the brake device comprises a brake assembly which comprises a first brake piston; a first brake housing for accommodating at least a portion of the first brake piston; wherein the first brake piston is used for providing or releasing a first type of brake pressure for a transmission shaft in a vehicle; the first brake housing includes a first guide portion configured to guide movement of the first brake piston. The brake device, the drive axle and the vehicle have the beneficial effect that the brake device which guides the first brake piston to move through the brake shell so as to be convenient to disassemble and maintain is provided.

Description

Technical Field

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

[0002] Currently, a vehicle's braking system consists of an outer housing and a brake assembly. The brake assembly typically includes a brake piston and a piston seat that guides the movement of the brake piston. Prior art uses a retaining ring to secure the piston seat within the outer housing. However, this retaining method requires specialized disassembly equipment (such as a press) for disassembly and maintenance, and the operation remains unchanged. Utility Model Content

[0003] The embodiments of the present application provide a braking device that is easy to disassemble and maintain, so as to at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above-mentioned object, according to a first aspect of the present application, a braking device is provided, comprising:

[0005] A brake assembly including a first brake piston;

[0006] a first brake housing for accommodating at least a portion of the first brake piston;

[0007] wherein the first brake piston is used to release or provide a first type of brake pressure to a drive shaft in a vehicle;

[0008] The first brake housing comprises:

[0009] The first guide portion is configured to guide the movement of the first brake piston.

[0010] Optionally, a first piston chamber is formed between the first brake piston and the first guide portion, and the first brake piston slides relative to the first guide portion when the first piston chamber is filled with oil or drained of oil.

[0011] Optionally, the first guide portion includes:

[0012] a first guide wall, in sliding connection with a portion of the first brake piston;

[0013] a second guide wall, forming a sliding connection with another portion of the first brake piston;

[0014] Wherein, the first piston chamber is located between the first guide wall surface and the second guide wall surface.

[0015] Optionally, the inner diameter of the first guide wall surface is greater than the inner diameter of the second guide wall surface, so that the first guide wall surface and the second guide wall surface form a stepped hole structure.

[0016] Optionally, the braking device further includes:

[0017] a plurality of first brake seals, for achieving sealing of the first piston chamber;

[0018] wherein at least a portion of the first brake seal is embedded in one of the first guide portion and the first brake piston, and the first brake seal is in contact with the other of the first guide portion and the first brake piston;

[0019] In a sliding direction of the first brake piston, the first piston chamber is disposed between at least two of the first brake seals.

[0020] Optionally, the first brake housing further includes:

[0021] The first connecting portion is used for fixedly connecting to an external device.

[0022] Optionally, the brake assembly further includes:

[0023] a second brake piston for applying or releasing a second type of brake pressure to a drive shaft in a vehicle;

[0024] The braking device further comprises:

[0025] a second brake housing for accommodating at least a portion of the second brake piston;

[0026] Wherein, the second brake housing comprises:

[0027] The second guide portion is configured to guide the movement of the second brake piston.

[0028] Optionally, a second piston chamber is formed between the second brake piston and the second guide portion, and the second brake piston slides relative to the second guide portion when the second piston chamber is filled with oil or drained of oil.

[0029] Optionally, the second guide portion includes:

[0030] a third guide wall, forming a sliding connection with a portion of the second brake piston;

[0031] a fourth guide wall, forming a sliding connection with another portion of the second brake piston;

[0032] Wherein, the second piston chamber is located between the third guide wall surface and the fourth guide wall surface.

[0033] Optionally, the inner diameter of the third guide wall surface is greater than the inner diameter of the fourth guide wall surface, so that the third guide wall surface and the fourth guide wall surface form a stepped hole structure.

[0034] Optionally, the braking device further includes:

[0035] a plurality of second brake seals, for achieving sealing of the second piston chamber;

[0036] wherein at least a portion of the second brake seal is embedded in one of the second guide portion and the second brake piston, and the second brake seal is in contact with the other of the second guide portion and the second brake piston;

[0037] In a sliding direction of the second brake piston, the second piston chamber is provided between at least two of the second brake seals.

[0038] Optionally, the second brake housing includes:

[0039] The second connecting portion is used for fixedly connecting to an external device.

[0040] Optionally, the first brake housing includes: a first coupling portion; the second brake housing includes a second coupling portion;

[0041] The first coupling portion is connected to the second coupling portion so that the first brake housing and the second brake housing form a whole, and the first brake piston and the second brake piston are both arranged inside the whole.

[0042] Optionally, the braking device further includes:

[0043] The connecting bolt is used to achieve a fixed connection between the first connecting portion and the second connecting portion.

[0044] Optionally, the brake assembly further includes:

[0045] a first elastic member, for providing or releasing the first type of braking pressure;

[0046] Wherein, the first elastic member is arranged between the first brake piston and the second brake housing.

[0047] Optionally, the brake assembly further includes:

[0048] a second elastic member, for releasing or providing the second type of braking pressure;

[0049] A stepped bolt is used to mount the second elastic member to the second brake housing.

[0050] Optionally, the brake assembly further includes:

[0051] a friction plate pack configured to brake the transmission shaft under pressure;

[0052] a brake pressure plate, configured to transmit the first type of brake pressure and / or the second type of brake pressure to the friction plate group;

[0053] The brake pressure plate is located between the first brake piston and / or the second brake piston and the friction plate group.

[0054] Optionally, the brake pressure plate is in sliding connection with the first guide portion.

[0055] Optionally, the friction plate group further includes:

[0056] a first friction plate, non-rotatably connected to the first brake housing;

[0057] a second friction plate, non-rotatably connected to the transmission shaft;

[0058] Wherein, the first friction plate and the second friction plate are configured to brake the transmission shaft through friction force.

[0059] Optionally, the friction plate group further includes:

[0060] a guide pin, passing through the first friction plate so as to form a sliding connection between the first friction plate and the guide pin;

[0061] a reset member, disposed between two adjacent first friction plates;

[0062] Wherein, one end of the guide pin is inserted into the first brake housing.

[0063] Optionally, the braking device further includes:

[0064] A housing seal is provided between the first brake housing and the second brake housing.

[0065] According to a second aspect of the present application, a drive axle is provided, comprising the above-mentioned braking device.

[0066] The brake device includes a brake assembly, a first brake housing and a second brake housing;

[0067] The drive axle comprises:

[0068] A drive device having a drive housing;

[0069] a speed reducer for forming a reduction transmission between the driving device and the wheels of the vehicle;

[0070] The reducer has a reduction housing, the second brake housing is fixedly connected to the drive housing of the drive device, and the first brake housing is connected between the second brake housing and the reduction housing of the reducer.

[0071] Optionally, the second brake housing has a movable space;

[0072] The drive axle further includes:

[0073] a differential, for transmitting the driving torque output by the driving device to two transmission shafts respectively;

[0074] at least two differential bearings, configured to provide support for the differential at different axial positions;

[0075] The differential is movably arranged in the movable space, and the differential bearing is arranged between the differential and the second brake housing.

[0076] Optionally, the differential comprises:

[0077] A differential housing capable of rotating about a differential axis under the drive of a driving device;

[0078] a planetary gear rotatably connected to the differential housing;

[0079] The differential bearing is coupled to the differential housing, and the planetary gear is located between the two differential bearings in the axial direction of the differential axis.

[0080] Optionally, the first brake housing has or is connected with:

[0081] The first mounting structure is used to mount the drive axle to a vehicle frame.

[0082] Optionally, the first brake housing has or is connected with:

[0083] The second mounting structure is adapted to be connected to a mast of the vehicle.

[0084] According to a third aspect of the present application, a vehicle is also provided, comprising the braking device or drive axle as described above.

[0085] The beneficial effects of the present application are: providing a brake device, a drive axle and a vehicle that guide the movement of a first brake piston through a brake housing for easy disassembly and maintenance.

[0086] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0087] The first brake housing is provided with a first guide portion to guide the movement of the first brake piston, so that the first brake housing has both housing and guide functions. During disassembly and maintenance, only the first brake piston needs to be separated from the first brake housing, which is simple and convenient to operate.

[0088] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] 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.

[0090] 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.

[0091] Figure 1 is a schematic diagram of the overall structure of a drive axle provided in an exemplary embodiment of the present application;

[0092] Figure 2 is an internal cross-sectional view of a drive axle provided in an exemplary embodiment of the present application;

[0093] Figure 3 is an internal cross-sectional view of a portion of a drive axle provided in an exemplary embodiment of the present application;

[0094] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0095] Figure 5 is a cross-sectional view of a portion of a first brake housing in a drive axle provided in an exemplary embodiment of the present application;

[0096] Figure 6 is a cross-sectional view of a second brake housing in a drive axle provided in an exemplary embodiment of the present application;

[0097] Figure 7 yes Figure 6 An enlarged schematic diagram of part B;

[0098] Figure 8 is a perspective view of a portion of a drive axle provided in an exemplary embodiment of the present application;

[0099] Figure 9 yes Figure 8 A magnified schematic diagram of part C;

[0100] Figure 10 is an internal cross-sectional view of a portion of a drive axle provided in an exemplary embodiment of the present application;

[0101] Figure 11 yes Figure 10 An enlarged schematic diagram of part D in the middle;

[0102] Figure 12is a schematic diagram of the internal structure of a reducer provided in an exemplary embodiment of the present application;

[0103] Figure 13 yes Figure 12 Enlarged schematic diagram of part E.

[0104] Description of reference numerals:

[0105] 10. Drive axle;

[0106] 100, driving device; 110, driving motor; 111, driving housing; 112, motor output shaft;

[0107] 210, transmission shaft; 220, first-stage driving gear; 230, first-stage driven gear;

[0108] 300, braking device;

[0109] 300a, brake assembly;

[0110] 310, friction plate group; 311, first friction plate; 312, second friction plate; 313, synchronizer; 314, guide pin; 315, reset member;

[0111] 321, first brake piston; 322, second brake piston;

[0112] 330, first brake housing; 331, first connecting portion; 332, first guide portion; 332a, first guide wall; 332b, second guide wall; 332c, fifth guide wall; 333, first joint; 334, first mounting structure; 335, second mounting structure;

[0113] 340, second brake housing; 341, second connecting portion; 342, second guide portion; 342a, third guide wall; 342b, fourth guide wall; 343, second joint; 344, movable space;

[0114] 351, first elastic member; 352, second elastic member; 353, step bolt; 354, brake pressure plate; 355, positioning pin;

[0115] 301, first piston chamber; 302, second piston chamber;

[0116] 361. Connecting bolt; 362. First brake seal; 363. Second brake seal; 364. Housing seal;

[0117] 410, differential; 411, differential case; 412, differential planetary gear; 413, output gear;

[0118] 420, intermediate shaft; 430, connecting shaft; 440, differential bearing; 450, mounting body; 460, mounting bolts;

[0119] 500, reducer;

[0120] 510, reduction housing; 510a, reduction chamber; 511, shifting portion; 512, ring gear;

[0121] 520, planet carrier; 521, stop structure;

[0122] 530, support bearing; 531, inner ring; 531a, load-bearing surface; 532, outer ring; 533, rolling element;

[0123] 540, stopper; 541, force-applying surface; 542, center hole; 551, fastener; 551a, step portion; 552, adjustment shim;

[0124] 560, reduction planetary gear; 570, gear shaft; 571, shaft body; 572, anti-rotation protrusion; 573, abutment surface;

[0125] 580, input shaft; 580a, input gear;

[0126] C1, transmission axis; C2, center axis; C3, differential axis. DETAILED DESCRIPTION

[0127] 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.

[0128] Reference Figures 1 to 2 The present application provides a drive axle 10 , including a drive device 100 , a transmission shaft 210 , a braking device 300 and a reducer 500 .

[0129] Specifically, the driving device 100 is used to output a driving torque. The transmission shaft 210 forms a transmission coupling with the driving device 100 so as to rotate around a transmission axis 210 under the drive of the driving device 100 .

[0130] It is understood that the transmission shaft 210 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 output shaft of the drive device 100. For example, the drive device 100 includes a drive motor 110, and the primary shaft is fixedly connected to the motor output shaft 112. The secondary shaft undergoes at least one stage of reduction relative to the primary shaft. The secondary shaft can also be the input shaft 580 of the reducer 500.

[0131] The braking device 300 is connected to the transmission shaft 210 and is used to provide braking force to the transmission shaft 210. The braking device 300 can realize at least one of a service braking function and a parking braking function.

[0132] For example, the transmission shaft 210 is a primary shaft connected to the drive device 100 via the differential 410. In this way, the brake device 300 is integrated into the transmission shaft 210, that is, the service brake function and the parking brake function are integrated into the transmission shaft 210, thereby improving the compactness of the brake device 300 and improving the braking response speed.

[0133] The reducer 500 is used to form a reduction transmission between the drive device 100 and the wheels of the vehicle. It is understood that the input shaft 580 of the reducer 500 and the transmission shaft 210 undergo at least one stage of reduction, or the input shaft 580 of the reducer 500 is directly connected to the transmission shaft 210, or the reducer 500 is directly connected to the drive device 100.

[0134] In some embodiments, reference Figures 2 to 5 The braking device 300 includes a braking assembly 300 a and a first braking housing 330 .

[0135] The brake assembly 300a includes a first brake piston 321 ; the first brake piston 321 is used to release or provide a first type of brake pressure to a drive shaft 210 in a vehicle.

[0136] The first brake housing 330 is used to accommodate at least a portion of the first brake piston 321 . The first brake housing 330 includes a first guide portion 332 . The first guide portion 332 is configured to guide the movement of the first brake piston 321 .

[0137] The first brake piston 321 can be used to implement a service brake function or a parking brake function, which is not limited.

[0138] Through the above technical solution, a first guide portion 332 is provided through the first brake housing 330 to guide the movement of the first brake piston 321, so that the first brake housing 330 has both the shell function and the guide function. When disassembling and maintaining, it is only necessary to separate the first brake piston 321 from the first brake housing 330, which is simple and convenient to operate.

[0139] In some embodiments, reference Figures 2 to 4 A first piston chamber 301 is formed between the first brake piston 321 and the first guide portion 332 , and the first brake piston 321 slides relative to the first guide portion 332 when the first piston chamber 301 is filled with oil or drained with oil.

[0140] By adopting such a solution, the second piston chamber 302 is directly disposed between the first brake piston 321 and the first guide portion 332 , resulting in a compact structure.

[0141] In some embodiments, reference Figures 2 to 5 The first guide portion 332 includes a first guide wall surface 332a and a second guide wall surface 332b.

[0142] The first guide wall 332a is in sliding connection with a portion of the first brake piston 321, and the second guide wall 332b is in sliding connection with another portion of the first brake piston 321. The first piston chamber 301 is located between the first guide wall 332a and the second guide wall 332b.

[0143] It can be understood that in the movement direction of the first brake piston 321, that is, in the axial direction of the transmission shaft 210, the first piston chamber 301 is located between the first guide wall 332a and the second guide wall 332b; or, in the radial direction of the transmission shaft 210, the first piston chamber 301 is located between the first guide wall 332a and the second guide wall 332b.

[0144] By adopting such a scheme, the first piston chamber 301 is confined between the first guide wall 332a and the second guide wall 332b. The cooperation between the first guide wall 332a and the second guide wall 332b and the first brake piston 321 forms constraints on both sides of the first piston chamber 301, which meets the sealing requirements of the first piston chamber 301 while facilitating the assembly and disassembly of the first brake piston 321 and the first brake housing 330. Moreover, by setting the first guide wall 332a and the second guide wall 332b, the movement stability of the first brake piston 321 can be improved.

[0145] In some embodiments, reference Figures 2 to 5 The inner diameter of the first guide wall surface 332a is greater than the inner diameter of the second guide wall surface 332b, so that the first guide wall surface 332a and the second guide wall surface 332b form a stepped hole structure.

[0146] By adopting such a solution, a stepped hole structure is formed by the first guide wall surface 332 a and the second guide wall surface 332 b , which is conducive to forming the first piston chamber 301 and can limit the movement stroke of the first brake piston 321 .

[0147] In some embodiments, reference Figures 2 to 5 The braking device 300 further includes: a first braking seal 362 .

[0148] Multiple first brake seals 362 are provided to seal the second piston chamber 302. At least a portion of each first brake seal 362 is embedded in one of the first guide portion 332 and the first brake piston 321, and each first brake seal 362 contacts the other of the first guide portion 332 and the first brake piston 321. In the sliding direction of the first brake piston 321, the first piston chamber 301 is disposed between at least two first brake seals 362.

[0149] By adopting such a solution, the second piston chamber 302 can be sealed during the sliding of the first brake piston 321 through the provision of the first brake seal 362 .

[0150] In some embodiments, reference Figures 2 to 5 The first brake housing 330 further includes a first connecting portion 331. The first connecting portion 331 is used for fixedly connecting to an external device.

[0151] It is understood that the external device may be the drive device 100, the reducer 500, etc. The first connecting portion 331 may be fixedly connected to one of the drive device 100 and the reducer 500, so that the first brake housing 330 constitutes part of the overall housing of the brake device 300; or the first connecting portion 331 may be connected to both the drive housing 111 and the reducer housing 510, so that the first brake housing 330 serves as the overall housing of the brake device 300.

[0152] With the above technical solution, the first brake housing 330 includes the first connecting portion 331 and the first guide portion 332, allowing the first brake housing 330 to both connect to the external device and provide guidance. During disassembly and maintenance, only the first brake housing 330 needs to be removed from the external device and then the first brake piston 321 is separated from the first brake housing 330, making the operation simple and convenient. Furthermore, the failure rate of the brake device 300 can be reduced, and the reliability can be improved.

[0153] In some embodiments, reference Figures 2 to 4 、 Figure 6 and Figure 7 The brake assembly 300a further includes a second brake piston 322. The second brake piston 322 is used to provide or release a second type of brake pressure to a transmission shaft 210 in a vehicle.

[0154] The brake device 300 further includes a second brake housing 340 . The second brake housing 340 is used to accommodate at least a portion of the second brake piston 322 .

[0155] The second brake housing 340 includes a second guide portion 342 . The second guide portion 342 is configured to guide the second brake piston 322 to move.

[0156] It can be understood that one of the first brake housing 330 and the second brake housing 340 can constitute the entire outer shell of the brake device 300 , or both of the first brake housing 330 and the second brake housing 340 can constitute the entire outer shell of the brake device 300 .

[0157] For example, the first brake piston 321 is used to implement a parking brake function, and the second brake piston 322 is used to implement a service brake function.

[0158] By adopting such a solution, the second brake piston 322 is matched with the second brake housing 340, and the first brake piston 321 is matched with the first brake housing 330, so that the two brake housings only need to be provided with an inner cavity to accommodate the brake piston, thereby reducing the processing amount of the inner cavity in the first brake housing 330 and the second brake housing 340, reducing the processing error, and facilitating processing.

[0159] In some embodiments, reference Figures 2 to 4 、 Figure 6 and Figure 7 A second piston chamber 302 is formed between the second brake piston 322 and the second guide portion 342 , and the second brake piston 322 slides relative to the second guide portion 342 when the second piston chamber 302 is filled with oil or drained with oil.

[0160] By adopting such a solution, the second piston chamber 302 is directly disposed between the second brake piston 322 and the second guide portion 342 , resulting in a compact structure.

[0161] In some embodiments, reference Figures 2 to 4 、 Figure 6 and Figure 7 The second guide portion 342 includes a third guide wall surface 342a and a fourth guide wall surface 342b.

[0162] The third guide wall 342a is in sliding connection with a portion of the second brake piston 322, and the fourth guide wall 342b is in sliding connection with another portion of the second brake piston 322. The second piston chamber 302 is located between the third guide wall 342a and the fourth guide wall 342b.

[0163] It can be understood that in the movement direction of the second brake piston 322, that is, in the axial direction of the transmission shaft 210 line, the second piston chamber 302 is located between the third guide wall surface 342a and the fourth guide wall surface 342b; or, in the radial direction of the transmission shaft 210 line, the second piston chamber 302 is located between the third guide wall surface 342a and the fourth guide wall surface 342b.

[0164] By adopting such a scheme, the second piston chamber 302 is confined between the third guide wall 342a and the fourth guide wall 342b. The third guide wall 342a and the fourth guide wall 342b cooperate with the second brake piston 322 to form constraints on both sides of the second piston chamber 302, thereby meeting the sealing requirements of the second piston chamber 302 and facilitating the assembly and disassembly of the second brake piston 322 and the second brake housing 340. Moreover, by setting the third guide wall 342a and the fourth guide wall 342b, the movement stability of the second brake piston 322 can be improved.

[0165] In some embodiments, reference Figures 2 to 4 、 Figure 6 and Figure 7 The inner diameter of the third guide wall surface 342a is greater than the inner diameter of the fourth guide wall surface 342b, so that the third guide wall surface 342a and the fourth guide wall surface 342b form a stepped hole structure.

[0166] By adopting such a solution, a stepped hole structure is formed by the third guide wall surface 342 a and the fourth guide wall surface 342 b , which is conducive to forming the second piston chamber 302 and can limit the movement stroke of the second brake piston 322 .

[0167] In some embodiments, reference Figures 2 to 4 、 Figure 6 and Figure 7 The braking device 300 further includes: a second braking seal 363 .

[0168] Multiple second brake seals 363 are provided to seal the second piston chamber 302. At least a portion of the second brake seal 363 is embedded in one of the second guide portion 342 and the second brake piston 322, and the second brake seal 363 contacts the other of the second guide portion 342 and the second brake piston 322. In the sliding direction of the second brake piston 322, the second piston chamber 302 is disposed between at least two second brake seals 363.

[0169] By adopting such a solution, the second brake seal 363 is provided, so that the second piston chamber 302 can be sealed during the sliding process of the second brake piston 322 .

[0170] In some embodiments, reference Figures 2 to 4 、 Figure 6 and Figure 7 The second brake housing 340 includes a second connecting portion 341. The second connecting portion 341 is used for fixedly connecting to an external device;

[0171] It can be understood that the first connection portion 331 can be fixedly connected to one of the driving device 100 and the reducer 500 , and the second connection portion 341 can be fixedly connected to the other of the driving device 100 and the reducer 500 .

[0172] With the above technical solution, the second brake housing 340 includes the second connecting portion 341 and the second guide portion 342, allowing the second brake housing 340 to both connect to external equipment and provide guidance. During disassembly and maintenance, only the second brake housing 340 needs to be removed from the external equipment or the first brake housing 330, and then the second brake piston 322 is separated from the second brake housing 340. This is a simple and convenient operation. Furthermore, the failure rate of the brake device 300 can be reduced, and its reliability can be improved.

[0173] In some embodiments, reference Figures 2 to 6 The first brake housing 330 includes a first coupling portion 333 , and the second brake housing 340 includes a second coupling portion 343 .

[0174] The first coupling portion 333 is connected to the second coupling portion 343 , so that the first brake housing 330 and the second brake housing 340 form a whole. The first brake piston 321 and the second brake piston 322 are both disposed inside the whole.

[0175] Exemplarily, one of the first combining portion 333 and the second combining portion 343 is provided with an annular positioning groove, and the other is embedded in the positioning groove, so that the first combining portion 333 and the second combining portion 343 can be quickly positioned.

[0176] With such a solution, the mutual positioning and fixation of the two brake housings are facilitated by the provision of the first coupling portion 333 and the second coupling portion 343 .

[0177] In some embodiments, reference Figures 2 to 4 The braking device 300 further includes a connecting bolt 361 . The connecting bolt 361 is used to achieve a fixed connection between the first connecting portion 333 and the second connecting portion 343 .

[0178] Exemplarily, the connecting bolt 361 passes through the second connecting portion 343 and is threadedly connected to the first connecting portion 333 .

[0179] With this solution, the assembly method is simple and the disassembly of the first brake housing 330 and the second brake housing 340 is convenient.

[0180] In some embodiments, reference Figures 2 to 4 The brake assembly 300a further includes a friction plate group 310. The friction plate group 310 is configured to brake the transmission shaft 210 under pressure.

[0181] Illustratively, the friction plate group 310 implements parking braking under the action of the first type of brake pressure, and the friction plate group 310 implements service braking under the action of the second type of brake pressure.

[0182] Since the first brake piston 321 and the second brake piston 322 act on the same friction plate group 310 , the number of friction plate groups 310 can be reduced.

[0183] In some embodiments, reference Figures 2 to 4 The brake assembly 300 a further includes a first elastic member 351 . The first elastic member 351 is used to provide or release the first type of brake pressure. The first elastic member 351 is disposed between the first brake piston 321 and the second brake housing 340 .

[0184] It can be understood that one of the first brake piston 321 and the first elastic member 351 provides the first type of braking pressure to the friction plate group 310 so that the friction plate group 310 generates a parking braking force, and the other is used to release the first type of braking pressure.

[0185] Exemplarily, the first elastic member 351 is a compression spring and is disposed on a side of the first brake piston 321 away from the friction plate pack 310. The first elastic member 351 provides a first type of braking pressure, which acts on the friction plate pack 310 via the first brake piston 321. Specifically, one end of the first elastic member 351 abuts the first brake piston 321, and the other end abuts the first brake housing 330.

[0186] In some embodiments, reference Figures 2 to 4 The brake assembly 300 a further includes: a second elastic member 352 and a step bolt 353 .

[0187] The second elastic member 352 is used to release or provide the second type of braking pressure; the stepped bolt 353 is used to install the second elastic member 352 to the second brake housing 340 .

[0188] It can be understood that one of the second brake piston 322 and the second elastic member 352 provides the second type of brake pressure to the friction plate pack 310, enabling the friction plate pack 310 to generate a service braking force, while the other is used to release the second type of brake pressure. The second elastic member 352 is mounted on a stepped bolt 353 to maintain its shape stability. The stepped bolt 353 passes through the second brake piston 322 and is fixedly connected to the second brake housing 340.

[0189] Exemplarily, the second elastic member 352 is a compression spring and is disposed on a side of the second brake piston 322 that is closer to the friction plate pack 310. The second type of braking pressure is provided by the second brake piston 322, while the second elastic member 352 biases the second brake piston 322, causing it to move away from the friction plate pack 310.

[0190] In some embodiments, reference Figures 2 to 4 The brake assembly 300a further includes a brake pressure plate 354 .

[0191] The brake pressure plate 354 is used to transmit the first type of brake pressure and / or the second type of brake pressure to the friction plate group 310 ; the brake pressure plate 354 is located between the first brake piston 321 and / or the second brake piston 322 and the friction plate group 310 .

[0192] It can be understood that at least one of the first brake piston 321 and the second brake piston 322 acts on the friction plate group 310 through the brake pressure plate 354 .

[0193] With such a solution, by disposing the brake pressure plate 354 , the first type of braking pressure and the second type of braking pressure can act evenly on the force-bearing side of the friction plate group 310 , providing a braking effect.

[0194] In some embodiments, reference Figures 2 to 4 , the brake pressing plate 354 is slidably connected with the first guide portion. Like this, the brake pressing plate 354 is supported by the second brake piston 322, improving the stability of the brake pressing plate 354 when it moves.

[0195] Illustratively, the first guide portion 332 further includes a fifth guide wall 332c, with which the brake pressure plates 354, 354 are slidably connected. The brake pressure plate 354 is also supported on the second brake piston 322 via a locating pin 355. Of course, the other end of the locating pin 355 can also be supported on the first brake housing 330, thereby preventing the brake pressure plate from rotating against the second brake piston 322 or the first brake housing 330 and enhancing the stability of the locating pin 355.

[0196] In some embodiments, reference Figure 3 、 Figure 4 、 Figure 8 and Figure 9 The friction plate group 310 also includes: a first friction plate 311 and a second friction plate 312 .

[0197] A plurality of first friction plates 311 are provided, each of which is fixedly connected to the first brake housing 330 and is axially slidable relative to the first brake housing 330; a plurality of second friction plates 312 are provided, each of which is fixedly connected to the transmission shaft 210 and is axially slidable relative to the transmission shaft 210; the first friction plates 311 and the second friction plates 312 are alternately arranged along the axial direction of the transmission axis 210, and the first friction plates 311 and the second friction plates 312 are configured to brake the transmission shaft by friction force.

[0198] The second friction plate 312 is locked in rotation with the transmission shaft 210 through a synchronizer 313 , which may be a spline sleeve.

[0199] Optionally, the first friction plate 311 is a steel plate, and the material of the first friction plate 311 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.

[0200] In some embodiments, reference Figures 8 and 9 The friction plate group 310 also includes: a guide pin 314 and a reset member 315.

[0201] A guide pin 314 is inserted through the first friction plate 311, establishing a sliding connection between the first friction plate 311 and the guide pin 314. Multiple first friction plates 311 are connected in series using the guide pin 314, one end of which is inserted into the first brake housing 330. The guide pin 314 guides the sliding movement of the first friction plates 311 and simultaneously prevents rotation between the first friction plates 311 and the first brake housing 330. A reset member 315 is provided between two adjacent first friction plates 311. When pressure on the friction plate group 310 is released, the reset member 315 can separate the first friction plate 311 from the second friction plate 312, preventing friction plate slip.

[0202] Exemplarily, the reset member 315 is a compression spring, and the reset member 315 is sleeved on the guide pin 314 .

[0203] This application exemplarily describes the working process of the braking device 300:

[0204] When parking brake is required, the hydraulic oil in the second piston chamber 302 is discharged, and under the action of the first elastic member 351, the second brake piston 322 will press the friction plate group 310 to achieve parking brake.

[0205] When the parking brake needs to be released, the hydraulic oil enters the second piston chamber 302. After being subjected to the hydraulic pressure, the second piston chamber 302 pushes the first brake piston 321 to move in the direction of compressing the first elastic member 351. As the hydraulic oil continues to enter, the first type of braking pressure provided by the first elastic member 351 is released. At this time, the friction plates are separated and the parking brake is released.

[0206] When service braking is required, hydraulic oil enters the second piston chamber 302. As the hydraulic pressure of the second piston chamber 302 continues to increase, the second brake piston 322 overcomes the elastic force of the second elastic member 352 and presses the friction plate group 310 to achieve service braking.

[0207] When the service brake needs to be released, the hydraulic pressure in the second piston chamber 302 is released, and the second brake piston 322 moves away from the friction plate group 310 under the action of the second elastic member 352. At this time, the friction plates are separated and the service brake is released.

[0208] In some embodiments, reference Figures 2 to 4 The brake device 300 further includes a housing seal 364. The housing seal 364 is disposed between the first brake housing 330 and the second brake housing 340. The housing seal 364 seals the space between the first brake housing 330 and the second brake housing 340, preventing the ingress of foreign matter and moisture, thereby extending the service life of the brake device 300.

[0209] In some embodiments, reference Figure 2 and Figure 3 The drive device 100 has a drive housing 111; the reducer 500 has a reduction housing 510, the second brake housing 340 is fixedly connected to the drive housing 111 of the drive device 100, and the first brake housing 330 is connected between the second brake housing 340 and the reduction housing 510 of the reducer 500.

[0210] By adopting such a solution, the second brake housing 340 is used to connect with the drive housing 111, and the first brake housing 330 is connected with the reduction housing 510, so that the first brake housing 330 and the second brake housing 340 together constitute the overall housing of the brake device 300, thereby eliminating the need to set up an additional housing, facilitating disassembly, and reducing manufacturing costs.

[0211] Moreover, during the assembly process, the first brake piston 321 can be pre-assembled with the first brake housing 330, and the second brake piston 322 can be pre-assembled with the second brake housing 340. Then, the first brake housing 330 and the second brake housing 340 are connected to form the brake device 300 as a whole, thereby realizing modular assembly of the brake device 300 and facilitating subsequent disassembly and maintenance.

[0212] In some embodiments, reference Figure 2 and Figure 3 The drive axle 10 further includes a differential 410 , which is used to transmit the driving torque output by the drive device 100 to the two transmission shafts 210 respectively.

[0213] Specifically, the differential 410 includes a differential case 411 , differential planetary gears 412 , and an output gear 413 .

[0214] The differential housing 411 is fixedly connected to the motor output shaft 112 and rotates synchronously with the motor output shaft 112. The differential planetary gear 412 is rotationally connected to the differential housing 411. Two output gears 413 are provided, each meshing with the differential planetary gear 412. One output gear 413 is fixedly connected to one of the drive shafts 210. The other output gear 413 is power-coupled to the other drive shaft 210 away from the differential 410 via an intermediate shaft 420. Specifically, the motor output shaft 112 has an axially extending shaft hole, and the intermediate shaft 420 passes through the shaft hole and is fixedly connected to the other drive shaft 210 away from the differential 410. The intermediate shaft 420 and the drive shaft 210 are fixedly connected via a coupling 430, which can be a spline sleeve, a coupling, or the like.

[0215] With the above solution, the output torque of the driving device 100 drives different wheels through two power transmission routes, and the two power transmission routes are consistent. In addition, the braking device 300 and the speed reducer 500 can be installed independently, making maintenance more convenient.

[0216] In some embodiments, reference Figure 2 and Figure 3 The second brake housing 340 has a movable space 344 ; the drive axle 10 further includes: a differential bearing 440 .

[0217] Two differential bearings 440 are provided, configured to provide support for the differential 410 at different positions in the axial direction; wherein the differential 410 is movably disposed in the movable space 344 , and the differential bearings 440 are disposed between the differential 410 and the second brake housing 340 .

[0218] With this solution, two differential bearings 440 are provided to support the differential case 411 at different locations along the axial direction of the differential axis C3. This reduces the size of a single differential bearing 440, thereby increasing the speed it can withstand and reducing noise generated by the differential bearing 440. Furthermore, the support provided by the two differential bearings 440 to the differential case 411 improves its stability, thereby enhancing the smooth operation of the differential 410.

[0219] At the same time, the differential 410 is movably disposed in the movable space 344 of the second brake housing 340 , and the second brake housing 340 is reused to protect the differential 410 , thereby improving the compactness of the structure.

[0220] In other embodiments, the number of differential bearings 440 may be greater than two.

[0221] In some embodiments, reference Figure 2 and Figure 3 The second brake housing 340 has or is connected to a mounting body 450. The mounting body 450 is used to position the differential bearing 440 for installation, thereby facilitating assembly of the differential bearing 440.

[0222] It can be understood that the differential bearing 440 can be directly installed on the second brake housing 340, or it can be installed using the mounting body 450; or, the differential bearing 440 on the side close to the first brake housing 330 is directly installed on the second brake housing 340, and the differential bearing 440 on the side away from the first brake housing 330 is installed through the mounting body 450.

[0223] Illustratively, the mounting body 450 is fixedly connected to the first brake housing 330 via mounting bolts 460 .

[0224] In some embodiments, reference Figure 2 and Figure 3 The differential bearing 440 is coupled to the differential housing 411, and the planetary gear is located between the two differential bearings 440 in the axial direction of the differential axis C3. By defining the installation positions of the two differential bearings 440, the two differential bearings 440 can stably support the differential housing 411.

[0225] In some embodiments, reference Figure 1 The first brake housing 330 has or is connected with: a first mounting structure 334. The first mounting structure 334 is used to mount the drive axle 10 to the vehicle frame.

[0226] For example, the first mounting structure 334 may be disposed in a mounting hole of the first brake housing 330 .

[0227] As a preferred solution, the differential axis C3 is arranged to coincide with the transmission axis 210 .

[0228] In some embodiments, reference Figure 1 The first brake housing 330 has or is connected to a second mounting structure 335. The second mounting structure 335 is used to connect to a vehicle mast. Providing the second mounting structure 335 on the first brake housing 330 allows for connection to a vehicle mast (e.g., a forklift mast), thereby achieving a smaller front overhang and a higher load capacity.

[0229] Illustratively, the second mounting structure 335 may be at least a portion of a bearing seat.

[0230] In some embodiments, reference Figure 2 、 Figures 10 to 12 The reducer 500 includes a planet carrier 520 , a support bearing 530 , a stopper 540 and a fastener 551 .

[0231] The planet carrier 520 rotates around a central axis C2; the support bearing 530 is connected to the planet carrier 520 to provide support for the planet carrier 520; the stopper 540 is used to limit the axial position of the support bearing 530 on the planet carrier 520; the fastener 551 is configured to fix the stopper 540 to the planet carrier 520 so that the stopper 540 and the planet carrier 520 can rotate synchronously.

[0232] For example, the support bearing 530 of the present application may be a tapered bearing, and the support bearing 530 and the planet carrier 520 are assembled in an interference fit or key connection manner. The fastener 551 may be a screw.

[0233] Through the above technical solution, by setting the stopper 540, the axial position of the support bearing 530 on the planetary carrier 520 is limited, and the stopper 540 is fixed to the planetary carrier 520 by the fastener 551, so as to achieve the limited fixation of the support bearing 530. The structure is simple, and the planetary carrier 520 only needs to be suitable for connection with the fastener 551. Compared with the method of fixing with round nuts in the prior art, the planetary carrier 520 does not need to be provided with corresponding threads, and the processing amount is small.

[0234] In some embodiments, reference Figures 10 to 12 , a projection of the stopper 540 in the axial direction of the central axis C2 at least partially overlaps with a projection of the support bearing 530 in the axial direction of the central axis C2.

[0235] By adopting such a solution, it is ensured that there is a sufficient effective area between the stopper 540 and the support bearing 530 , so that the stopper 540 can stably act on the support bearing 530 .

[0236] In some embodiments, reference Figures 10 to 12 The stopper 540 has a force-applying surface 541 , and the support bearing 530 has a force-receiving surface 531 a . The force-applying surface 541 is configured to act on the force-receiving surface 531 a at different positions in the circumferential direction of the central axis C2 .

[0237] The force-applying surface 541 is configured to act on the force-bearing surface 531a at different positions in the circumferential direction of the central axis C2. It can be understood that the force-applying surface 541 and the force-bearing surface 531a can be multiple action areas spaced apart in the circumferential direction, or form a continuous annular action area in the circumferential direction.

[0238] This solution achieves positional fixation through the cooperation between the force-applying surface 541 and the force-receiving surface 531a, resulting in a simple structure and ease of processing. Furthermore, by limiting the effective areas of the force-applying surface 541 and the force-receiving surface 531a, the stopper 540 acts evenly on the support bearing 530 in the circumferential direction, preventing the stopper 540 from tilting due to uneven force, thereby ensuring the positional fixation effect.

[0239] As a specific solution, refer to Figures 10 to 12 The force-applying surface 541 and the force-receiving surface 531a are constructed as an annular structure.

[0240] In some embodiments, reference Figures 10 to 12 The fastener 551 includes a step portion 551a and a threaded portion (not shown).

[0241] The outer diameter of the stepped portion 551a is larger than that of the threaded portion. The threaded portion is disposed on one side of the stepped portion 551a and is connected to the planet carrier 520. At least a portion of the threaded portion passes through the stopper 540. The threaded portion is connected to the planet carrier 520 so that at least a portion of the stopper 540 is clamped between the stepped portion 551a and the planet carrier 520, securing the stopper 540 to the planet carrier 520. It will be appreciated that the planet carrier 520 has a threaded hole (not shown) that mates with the threaded portion.

[0242] For example, the fastener 551 may be a screw.

[0243] In some embodiments, reference Figures 10 to 12 The reducer 500 includes a plurality of fasteners 551 disposed at different circumferential positions. The plurality of fasteners 551 ensures that the stopper 540 receives a uniform force in the circumferential direction.

[0244] In some embodiments, reference Figures 10 to 13 The speed reducer 500 further includes an adjusting washer 552 . The adjusting washer 552 is disposed between the stopper 540 and the planet carrier 520 .

[0245] By adopting such a solution, by adjusting the setting of the gasket 552, not only the contact area between the stop member 540 and the planetary carrier 520 can be increased, but also when the stop member 540 is adjusted to a different axial position, support can be provided between the stop member 540 and the planetary carrier 520 to compensate for the axial gap between the stop member 540 and the planetary carrier 520, thereby preventing the stop member 540 from tilting under the pressure of the fastener 551 and affecting the stable contact between the force-applying surface 541 and the force-bearing surface 531a.

[0246] In some embodiments, reference Figures 10 to 12 The reducer 500 also includes: a reduction planetary gear 560 and a gear shaft 570.

[0247] The gear shaft 570 is fixedly connected to the planet carrier 520 , and the reduction planetary gear 560 is rotationally connected to the gear shaft 570 . The reduction planetary gear 560 rotates while revolving around the central axis C2 , thereby driving the planet carrier 520 to rotate around the central axis C2 .

[0248] It is understandable that the anti-rotation connection between the gear shaft 570 and the planet carrier 520 can be achieved by a key connection, a pin connection or other methods.

[0249] In some embodiments, reference Figures 10 to 13 The stopper 540 has a central hole 542. The central hole 542 passes through the stopper 540 in the axial direction.

[0250] The gear shaft 570 includes a shaft body 571 and a stopper 572. The shaft body 571 is inserted into the planet carrier 520 for mounting the reduction planetary gear 560. At least a portion of the stopper 572 is inserted into the center hole 542 and contacts the wall of the center hole 542.

[0251] It is understood that at least a portion of the anti-rotation projection 572 contacts the wall of the center hole 542. The contact portion can conform to the shape of the wall of the center hole 542, or a contact surface of a different shape can be used. The shape of the anti-rotation projection 572 is not specifically limited and can be adjusted according to actual design requirements.

[0252] By adopting such a solution, the stopper 540 is reused to limit the gear shaft 570 through the cooperation between the anti-rotation protrusion 572 and the hole wall of the center hole 542, thereby preventing the gear shaft 570 from rotating relative to the planetary carrier 520. The planetary carrier 520 does not need to process additional structures to limit the rotation of the gear shaft 570, further reducing the processing amount.

[0253] In some embodiments, reference Figures 10 to 13 Gear shaft 570 has an abutment surface 573. Abutment surface 573 abuts against the side of stopper 540 that is closest to planet carrier 520. The cooperation between abutment surface 573 and stopper 540 allows the stopper 540 to be reused to limit the axial position of gear shaft 570, simplifying assembly of gear shaft 570.

[0254] In some embodiments, reference Figures 10 to 13 The anti-rotation protrusion 572 protrudes from the abutting surface 573 in the axial direction, and the cross-sectional dimension of the anti-rotation protrusion 572 is smaller than the cross-sectional dimension of the shaft body 571. With such an arrangement, the anti-rotation protrusion 572 and the abutting surface 573 are conveniently processed.

[0255] In some embodiments, reference Figures 10 to 12The support bearing 530 includes an inner ring 531 and an outer ring 532, with rolling elements 533 disposed between the outer ring 532 and the inner ring 531. The inner ring 531 is fitted over the planet carrier 520, with a force-bearing surface 531a formed on the inner ring 531, and a stopper 540 abutting against the inner ring 531. It will be appreciated that the inner ring 531 and the planet carrier 520 form a non-rotating connection through an interference fit or keyed connection.

[0256] In some embodiments, reference Figures 10 to 12 The reducer 500 further includes: a reduction housing 510 .

[0257] The reduction housing 510 has a reduction chamber 510a, and the reduction housing 510 is formed with a gear portion 511, which is formed on the inner wall of the reduction housing 510; the planetary carrier 520 is installed in the reduction chamber 510a through a support bearing 530, and the outer ring 532 of the support bearing 530 is in contact with the gear portion 511, and the inner ring 531 of the support bearing 530 is mounted on the planetary carrier 520.

[0258] By adopting such a solution, the axial positioning of the support bearing 530 is achieved through the cooperation between the blocking portion 511 and the stopper 540 , which facilitates assembly.

[0259] In some embodiments, reference Figures 10 to 12 The planet carrier 520 is mounted in the deceleration chamber 510a via two support bearings 530, with the stopper 511 disposed between the two support bearings 530. The planet carrier 520 has or is connected to a stop structure 521; the inner ring 531 of one support bearing 530 farther from the stopper 540 abuts against the stop structure 521, while the inner ring 531 of the other support bearing 530 closer to the stopper 540 abuts against the stopper 540.

[0260] For example, referring to Figure 10 The stop structure 521 may be a shaft shoulder formed on the side wall of the planet carrier 520 .

[0261] By adopting such a solution, the outer rings 532 of the two support bearings 530 are positioned simultaneously by utilizing the shifting portion 511, and the distance between the stopper 540 and the stop structure 521 is changed by adjusting the position of the stopper 540. At the same time, a force is applied to the inner rings 531 of the two support bearings 530 to achieve the limitation of the two support bearings 530, which facilitates assembly.

[0262] In some embodiments, reference Figures 10 to 12 The reduction housing 510 is further formed with a ring gear 512 . The ring gear 512 is disposed around the central axis C2 and meshes with the reduction planetary gear 560 . At least a portion of the ring gear 512 is located at the same axial position as the shift portion 511 .

[0263] Exemplarily, the gear ring 512 and the shifting portion 511 are located at the same axial position, that is, both side end faces of the gear ring 512 are used to limit the outer rings 532 of the two support bearings 530 .

[0264] By adopting such a solution, the gear ring 512 and the shifting portion 511 are arranged at the same axial position, thereby optimizing the axial spatial arrangement of the reducer 500 and achieving a compact structure.

[0265] In some embodiments, reference Figures 10 to 12 The reducer 500 further includes: an input shaft 580 .

[0266] The input shaft 580 is configured to rotate about the central axis C2 when driven by a drive device 100. At least a portion of the input shaft 580 is rotationally supported by the planetary carrier 520. The planetary carrier 520 supports the input shaft 580, thereby improving the stability of the input shaft 580. The input shaft 580 includes or is connected to an input gear 580a, which meshes with the reduction planetary gear 560, thereby driving the planetary gears and the planetary carrier 520 to rotate.

[0267] In some embodiments, reference Figure 2 and Figure 10 The transmission shaft 210 has or is connected to a primary driving gear 220 , and the input shaft 580 has or is connected to a primary driven gear 230 . The primary driven gear 230 is engaged with the primary driving gear 220 , thereby achieving a first-stage reduction between the transmission shaft 210 and the input shaft 580 .

[0268] The present application also provides a vehicle, which includes the above-mentioned drive axle 10. The vehicle has all the beneficial effects of the above-mentioned drive axle 10, which will not be described in detail in the present application.

[0269] Exemplarily, the vehicle may be a forklift, and the present application may meet the driving and braking requirements of the forklift.

[0270] 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.

[0271] 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.

[0272] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0273] 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 braking device, characterized in that: include: A brake assembly including a first brake piston; a first brake housing for accommodating at least a portion of the first brake piston; wherein the first brake piston is used to release or provide a first type of brake pressure to a drive shaft in a vehicle; The first brake housing comprises: The first guide portion is configured to guide the movement of the first brake piston.

2. The braking device according to claim 1, characterized in that A first piston chamber is formed between the first brake piston and the first guide portion. The first brake piston slides relative to the first guide portion when the first piston chamber is filled with oil or drained of oil.

3. The braking device according to claim 2, characterized in that The first guide portion includes: a first guide wall, in sliding connection with a portion of the first brake piston; a second guide wall, forming a sliding connection with another portion of the first brake piston; Wherein, the first piston chamber is located between the first guide wall surface and the second guide wall surface.

4. The braking device according to claim 3, characterized in that The inner diameter of the first guide wall surface is greater than the inner diameter of the second guide wall surface, so that the first guide wall surface and the second guide wall surface form a stepped hole structure.

5. The braking device according to claim 3, characterized in that: The braking device further comprises: a plurality of first brake seals, for achieving sealing of the first piston chamber; wherein at least a portion of the first brake seal is embedded in one of the first guide portion and the first brake piston, and the first brake seal is in contact with the other of the first guide portion and the first brake piston; In a sliding direction of the first brake piston, the first piston chamber is disposed between at least two of the first brake seals.

6. The braking device according to claim 1, wherein: The first brake housing further comprises: The first connecting portion is used for fixedly connecting to an external device.

7. The braking device according to claim 2, characterized in that: The brake assembly further comprises: a second brake piston for applying or releasing a second type of brake pressure to a drive shaft in a vehicle; The braking device further comprises: a second brake housing for accommodating at least a portion of the second brake piston; Wherein, the second brake housing comprises: The second guide portion is configured to guide the movement of the second brake piston.

8. The braking device according to claim 7, characterized in that A second piston chamber is formed between the second brake piston and the second guide portion. The second brake piston slides relative to the second guide portion when the second piston chamber is filled with oil or drained of oil.

9. The braking device according to claim 8, characterized in that The second guide portion includes: a third guide wall, forming a sliding connection with a portion of the second brake piston; a fourth guide wall, forming a sliding connection with another portion of the second brake piston; Wherein, the second piston chamber is located between the third guide wall surface and the fourth guide wall surface.

10. The braking device according to claim 9, characterized in that: The inner diameter of the third guide wall surface is greater than the inner diameter of the fourth guide wall surface, so that the third guide wall surface and the fourth guide wall surface form a stepped hole structure.

11. The braking device according to claim 9, characterized in that The braking device further comprises: a plurality of second brake seals, for achieving sealing of the second piston chamber; wherein at least a portion of the second brake seal is embedded in one of the second guide portion and the second brake piston, and the second brake seal is in contact with the other of the second guide portion and the second brake piston; In a sliding direction of the second brake piston, the second piston chamber is provided between at least two of the second brake seals.

12. The braking device according to claim 7, characterized in that The second brake housing comprises: The second connecting portion is used for fixedly connecting to an external device.

13. The braking device according to claim 7, characterized in that The first brake housing includes: a first coupling portion; the second brake housing includes a second coupling portion; The first coupling portion is connected to the second coupling portion so that the first brake housing and the second brake housing form a whole, and the first brake piston and the second brake piston are both arranged inside the whole.

14. The braking device according to claim 13, characterized in that The braking device further comprises: The connecting bolt is used to achieve a fixed connection between the first connecting portion and the second connecting portion.

15. The braking device according to any one of claims 7 to 14, characterized in that: The brake assembly further comprises: a first elastic member, for providing or releasing the first type of braking pressure; Wherein, the first elastic member is arranged between the first brake piston and the second brake housing.

16. The braking device according to any one of claims 7 to 14, characterized in that: The brake assembly further comprises: a second elastic member, for releasing or providing the second type of braking pressure; A stepped bolt is used to mount the second elastic member to the second brake housing.

17. The braking device according to any one of claims 7 to 14, characterized in that: The brake assembly further comprises: a friction plate pack configured to brake the transmission shaft under pressure; a brake pressure plate, configured to transmit the first type of brake pressure and / or the second type of brake pressure to the friction plate group; The brake pressure plate is located between the first brake piston and / or the second brake piston and the friction plate group.

18. The braking device according to claim 17, characterized in that The brake pressure plate is slidably connected to the first guide portion.

19. The braking device according to claim 17, wherein: The friction plate group also includes: a first friction plate, non-rotatably connected to the first brake housing; a second friction plate, non-rotatably connected to the transmission shaft; Wherein, the first friction plate and the second friction plate are configured to brake the transmission shaft through friction force.

20. The braking device according to claim 19, characterized in that The friction plate group also includes: a guide pin, passing through the first friction plate so as to form a sliding connection between the first friction plate and the guide pin; a reset member, disposed between two adjacent first friction plates; Wherein, one end of the guide pin is inserted into the first brake housing.

21. The braking device according to any one of claims 7 to 14, characterized in that: The braking device further comprises: A housing seal is provided between the first brake housing and the second brake housing.

22. A drive axle, characterized in that: A braking device comprising the braking device according to any one of claims 1 to 21.

23. The drive axle according to claim 22, characterized in that: The brake device includes a brake assembly, a first brake housing and a second brake housing; The drive axle comprises: A drive device having a drive housing; a speed reducer for forming a reduction transmission between the driving device and the wheels of the vehicle; The reducer has a reduction housing, the second brake housing is fixedly connected to the drive housing of the drive device, and the first brake housing is connected between the second brake housing and the reduction housing of the reducer.

24. The drive axle according to claim 23, characterized in that: The second brake housing has a movable space; The drive axle further includes: a differential, for transmitting the driving torque output by the driving device to two transmission shafts respectively; at least two differential bearings, configured to provide support for the differential at different axial positions; The differential is movably arranged in the movable space, and the differential bearing is arranged between the differential and the second brake housing.

25. The drive axle according to claim 24, characterized in that: The differential comprises: A differential housing capable of rotating about a differential axis under the drive of a driving device; a planetary gear rotatably connected to the differential housing; The differential bearing is coupled to the differential housing, and the planetary gear is located between the two differential bearings in the axial direction of the differential axis.

26. The drive axle according to claim 22, characterized in that The first brake housing has or is connected with: The first mounting structure is used to mount the drive axle to a vehicle frame.

27. The drive axle according to claim 22, characterized in that The first brake housing has or is connected with: The second mounting structure is adapted to be connected to a mast of the vehicle.

28. A vehicle, characterized in that: The brake device comprises any one of claims 1 to 21 or the drive axle according to claims 22 to 27.

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