Braking device, drive axle, and vehicle

Abstract

A vehicle, comprising a drive axle, the drive axle comprising a braking device. The braking device comprises: a prime-mover braking assembly for providing a first type of braking force to a prime-mover shaft in a vehicle; and a transmission braking assembly for providing a second type of braking force to a transmission shaft in the vehicle. The prime-mover braking assembly is connected to the prime-mover shaft, and the transmission braking assembly is connected to the transmission shaft.

Description

Braking device, drive axle and vehicle

[0001] The present application claims priority to the Chinese patent publication with the publication number 202411298899.X and the title "Braking device, drive axle and vehicle" filed in the China Patent Office on September 14, 2024, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to, but is not limited to, the technical field of brakes, and in particular to a braking device, a drive axle and a vehicle. BACKGROUND

[0003] Most of the current vehicle braking systems use a combination of service braking and parking braking.

[0004] In the related art, the service braking and the parking braking are integrated and arranged on the same axle, and different braking forces are applied to the same axle. However, such a braking scheme cannot better adapt to different braking requirements, and the braking performance is poor. SUMMARY

[0005] The embodiments of the present application provide a braking device, which improves the braking performance of the braking device to at least partially solve the above technical problems.

[0006] According to a first aspect of the present application, a braking device is provided, comprising:

[0007] a prime mover braking assembly configured to provide a first type of braking force to a prime mover axle in a vehicle; and

[0008] a transmission braking assembly configured to provide a second type of braking force to a transmission axle in the vehicle.

[0009] The prime mover braking assembly is connected to the prime mover axle, and the transmission braking assembly is connected to the transmission axle.

[0010] In some embodiments of the present application, the prime mover braking assembly comprises:

[0011] a first friction plate set configured to generate the first type of braking force under pressure; and

[0012] a prime mover braking piston configured to release or provide a first pressure to the first friction plate set.

[0013] The first friction plate set is combined to the prime mover axle.

[0014] In some embodiments of the present application, the prime mover braking assembly further comprises:

[0015] a prime mover elastic member configured to provide or release the first pressure.

[0016] The motive elastic member is combined to the motive brake piston.

[0017] In some embodiments of the present application, the brake device further comprises:

[0018] The motive brake piston is in sliding connection with the brake seat.

[0019] The motive brake piston and the brake seat form a motive piston cavity therebetween, and the motive brake piston slides relative to the brake seat when the motive piston cavity is filled with oil or drained.

[0020] In some embodiments of the present application, the brake seat further has:

[0021] A first flow channel is configured to fill and / or drain the motive piston cavity.

[0022] One end of the first flow channel is in communication with the motive piston cavity, and the other end is in communication with an external pipeline.

[0023] In some embodiments of the present application, the transmission brake assembly comprises:

[0024] A second friction plate set is configured to generate a second type of braking force under pressure; and

[0025] A transmission brake piston is configured to release or provide a second pressure to the second friction plate set.

[0026] The second friction plate set is combined to the transmission shaft.

[0027] In some embodiments of the present application, the transmission brake assembly further comprises:

[0028] A transmission elastic member is configured to provide or release the second pressure.

[0029] The transmission elastic member is combined to the transmission brake piston.

[0030] In some embodiments of the present application, the brake device further comprises:

[0031] The transmission brake piston is in sliding connection with the brake seat.

[0032] The transmission brake piston and the brake seat form a transmission piston cavity therebetween, and the transmission brake piston slides relative to the brake seat when the transmission piston cavity is filled with oil or drained.

[0033] In some embodiments of the present application, the brake seat further has:

[0034] A second flow channel is configured to fill and / or drain the transmission piston cavity.

[0035] The second flow channel is connected to the transmission piston cavity at one end and to an external pipeline at the other end.

[0036] In some embodiments of the present application, the brake device comprises:

[0037] A brake seat having a seat space;

[0038] The prime mover brake assembly and / or the transmission brake assembly are arranged in the seat space.

[0039] In some embodiments of the present application, the prime mover brake assembly comprises:

[0040] A first friction plate group configured to generate a first type of braking force under pressure;

[0041] A prime mover brake piston for removing or providing a first pressure to the first friction plate group;

[0042] The transmission brake assembly comprises:

[0043] A second friction plate group configured to generate a second type of braking force under pressure;

[0044] A transmission brake piston for providing or removing a second pressure to the second friction plate group;

[0045] The first pressure and the second pressure are in opposite directions.

[0046] In some embodiments of the present application, the prime mover brake piston and the transmission brake piston are both located between the first friction plate group and the second friction plate group.

[0047] In some embodiments of the present application, the prime mover brake piston and the transmission brake piston slide axially along the same central axis.

[0048] In some embodiments of the present application, at least part of the prime mover brake piston and at least part of the transmission brake piston are located at the same axial position.

[0049] In some embodiments of the present application, the brake seat comprises:

[0050] A first base body, the prime mover brake piston and the first base body being in sliding connection; and

[0051] A second base body, the transmission brake piston and the second base body being in sliding connection;

[0052] The prime mover brake piston and / or the transmission brake piston are located between the first base body and the second base body.

[0053] In some embodiments of the present application, a moving space is formed between the first base and the second base, and at least part of the prime mover brake piston is located inside the moving space;

[0054] The brake device further comprises:

[0055] A prime mover elastic member is arranged to bias the prime mover brake piston;

[0056] The prime mover elastic member abuts between the prime mover brake piston and the second base.

[0057] In some embodiments of the present application, at least part of the first base and at least part of the second base are located at the same axial position.

[0058] In some embodiments of the present application, the brake seat further comprises:

[0059] An outer housing is formed with the seat inner space;

[0060] The first base and the second base are respectively located in the seat inner space, and the first base and the second base are respectively and independently fixed to the outer housing.

[0061] In some embodiments of the present application, the second base is fixed to the outer housing by a plurality of bolts.

[0062] In some embodiments of the present application, the brake seat further comprises:

[0063] A baffle plate is combined to a predetermined axial position of the outer housing;

[0064] The first base is fixedly connected to the baffle plate.

[0065] In some embodiments of the present application, the brake seat further has:

[0066] An over-flow passage is arranged to communicate the seat inner space with the outside, so that the oil outside can exchange heat with the prime mover brake assembly and / or the transmission brake assembly in the seat inner space.

[0067] In some embodiments of the present application, the transmission shaft is connected with a speed reduction mechanism, and the over-flow passage is communicated to a speed reduction chamber of the speed reduction mechanism.

[0068] According to a second aspect of the present application, a drive axle is provided, comprising the above-mentioned brake device.

[0069] In some embodiments of the present application, the drive axle further comprises:

[0070] A prime mover shaft is arranged to rotate under the drive of a prime mover;

[0071] a transmission shaft, which is in transmission coupling with the prime mover shaft.

[0072] In some embodiments of the present application, the prime mover is arranged between the two transmission brake assemblies.

[0073] In some embodiments of the present application, the prime mover is arranged between the prime brake assembly and the transmission brake assembly.

[0074] In some embodiments of the present application, the prime mover shaft is configured as an output shaft of an electric motor, and the prime mover shaft has a shaft hole extending through in the axial direction;

[0075] The drive axle further comprises:

[0076] a differential for transmitting power of the prime mover shaft to the two transmission shafts; and

[0077] an intermediate shaft rotatably penetrating the shaft hole to be in transmission connection with the differential and one of the transmission shafts, respectively;

[0078] wherein the differential is located between the prime mover and the transmission brake assembly.

[0079] According to a third aspect of the present application, there is further provided a vehicle comprising the drive axle as described above.

[0080] The present application has the beneficial effect of providing a brake device, a drive axle and a vehicle, which meet different braking requirements by applying different braking forces on the prime mover shaft and the transmission shaft of the vehicle.

[0081] More specifically, some embodiments of the present application can have the following specific beneficial effects:

[0082] By arranging the prime brake assembly to provide the first type of braking force to the prime mover shaft in the vehicle, the stability of the vehicle can be maintained when the vehicle is stationary; and by arranging the transmission brake assembly to provide the second type of braking force to the transmission shaft in the vehicle, the vehicle can be quickly responded and effectively decelerated or stopped. Through the above decentralized design, the two brake assemblies can focus on their main functions, better adapt to different braking requirements, and improve the braking performance.

[0083] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0084] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0085] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0086] Figure 1 is a schematic diagram of the overall structure of the drive bridge provided in an exemplary embodiment of this application;

[0087] Figure 2 is an internal cross-sectional view of the drive axle provided in an exemplary embodiment of this application;

[0088] Figure 3 is an internal cross-sectional view of a portion of the drive axle provided in an exemplary embodiment of this application;

[0089] Figure 4 is an enlarged schematic diagram of part A in Figure 3;

[0090] Figure 5 is an enlarged schematic diagram of part B in Figure 3;

[0091] Figure 6 is an internal cross-sectional view of another part of the drive axle provided in an exemplary embodiment of this application;

[0092] Figure 7 is an internal cross-sectional view of another part of the drive axle provided in an exemplary embodiment of this application;

[0093] Figure 8 is an internal cross-sectional view of another part of the drive axle provided in an exemplary embodiment of this application;

[0094] Figure 9 is an exploded view of a portion of the braking device provided in an exemplary embodiment of this application;

[0095] Figure 10 is a perspective view of the second substrate in the braking device provided in an exemplary embodiment of this application;

[0096] Figure 11 is a perspective view of the second base in the braking device provided in an exemplary embodiment of this application from another angle;

[0097] Figure 12 is a cross-sectional structural diagram of the second substrate in the braking device provided in an exemplary embodiment of this application.

[0098] The reference signs are explained as follows: 100, brake device; 100a, original brake assembly; 110, first friction plate group; 120a, original piston cavity; 121, original brake piston; 121a, first accommodating groove; 122, original elastic member; 100b, transmission brake assembly; 130, second friction plate group; 131, first friction plate; 132, second friction plate; 133, guide pin; 134, reset member; 135, synchronization member; 140a, transmission piston cavity; 141, transmission brake piston; 142, transmission elastic member; 143, support member; 143a, limiting boss; 150, brake seat; 150a, seat inner space; 150b, movable space; 150c, overflow passage; 151, first base body; 151a, first flow channel; 152, second base body; 152a, second flow channel; 152b, second accommodating groove; 152c, bolt hole; 152d, spline groove; 153, outer shell; 154, baffle; 161, first liquid exchange connector; 162, second liquid exchange connector; 163, gas exchange connector; 164, first sealing ring; 165, second sealing ring; C1, central axis; 10, drive axle; 210, original motor; 211, original shaft; 211a, shaft hole; 220, primary transmission shaft; 221, primary driving gear; 230, differential; 231, differential housing; 232, first planetary gear; 233, output gear; 241, intermediate shaft; 242, connecting member; 250, reduction mechanism; 251, secondary transmission shaft; 251a, secondary driven gear; 252, reduction housing; 252a, reduction cavity; 253, gear ring; 254, sun gear; 255, second planetary gear; 256, planet carrier; 257, planet shaft. DETAILED DESCRIPTION

[0099] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the protection scope of the present application.

[0100] According to a first aspect of the present application, with reference to FIG. 1 and FIG. 2, the present application provides a brake device 100, comprising: an original brake assembly 100a and a transmission brake assembly 100b.

[0101] The original brake assembly 100a is used to provide a first type of braking force to an original shaft 211 in a vehicle; and the transmission brake assembly 100b is used to provide a second type of braking force to a transmission shaft in a vehicle. Specifically, the original brake assembly 100a is connected to the original shaft 211, and the transmission brake assembly 100b is connected to the transmission shaft.

[0102] It should be noted that the original shaft 211 can be a shaft directly driven by the original motor 210.

[0103] It should be noted that the transmission shaft can be a primary transmission shaft 220 or a secondary transmission shaft 251, wherein the primary transmission shaft 220 can be understood as having a similar or same speed as the original shaft 211, for example, the primary transmission shaft 220 is connected to the original shaft 211 through a differential 230. The secondary transmission shaft 251 is at least one stage of speed reduction relative to the primary transmission shaft 220.

[0104] And it should be noted that the original brake assembly 100a can be used for service braking or parking braking; the transmission brake assembly 100b can also be used for service braking or parking braking. That is, according to different designs or actual working conditions, the functions of the original brake assembly 100a and the transmission brake assembly 100b can be switched as needed, and no limitation is made.

[0105] Through the above technical solution, by setting the original brake assembly 100a to provide the first type of braking force to the original shaft 211 in the vehicle, the stability of the vehicle can be maintained when the vehicle is stationary; and by setting the transmission brake assembly 100b to provide the second type of braking force to the transmission shaft in the vehicle, the braking system can quickly respond and effectively slow down or stop. Through the above decentralized design, the two brake assemblies can focus on their main functions, better adapt to different braking needs, and improve the braking performance.

[0106] And since the transmission brake assembly 100b is used for deceleration, a large amount of heat will be generated during braking, and the present application arranges the original brake assembly 100a on the original shaft 211, reduces the overall structural complexity of the brake device 100, improves the heat dissipation efficiency, and maintains the stability of the braking performance.

[0107] At the same time, arranging the original brake assembly 100a and the transmission brake assembly 100b on different shafts can reduce the failure of the entire brake device 100 due to the failure of the transmission shaft (such as the connection failure of the transmission shaft and the friction plate group), and improve the reliability of the braking system.

[0108] In some embodiments, referring to FIGS. 3 and 4, the original brake assembly 100a includes a first friction plate group 110 and an original brake piston 121.

[0109] The first friction plate group 110 is combined to the original shaft 211 and is configured to generate the first type of braking force under the action of pressure. The original brake piston 121 is used to release or provide the first pressure to the first friction plate group 110;

[0110] It can be understood that the first pressure can be provided by the original brake piston 121 in a manner of pressing the first friction plate set 110, or the first pressure is provided by other pressure components, such as a spring, and the original brake piston 121 is used to act on the pressure component to release the first pressure of the first friction plate set 110.

[0111] In some embodiments, referring to FIGS. 3 and 4, the original brake assembly 100a further comprises an original elastic member 122.

[0112] The original elastic member 122 is combined with the original brake piston 121 to provide or release the first pressure. The provision and release of the first pressure are realized through the cooperation of the original elastic member 122 and the original brake piston 121.

[0113] Exemplarily, the original elastic member 122 is a compression spring, and the original elastic member 122 is arranged on the side of the original brake piston 121 away from the first friction plate set 110, and the first pressure is provided by the original elastic member 122 and acts on the first friction plate set 110 through the original brake piston 121.

[0114] In some embodiments, referring to FIGS. 3, 4 and 9, the original elastic member 122 is arranged in multiple groups, and the multiple original elastic members 122 are arranged at intervals in the circumferential direction of the original brake piston 121 to provide uniform elastic force in the circumferential direction of the original brake piston 121. Optionally, multiple groups of original elastic members 122 can also be arranged in the radial direction of the original brake piston 121 to further increase the size of the elastic force, so that the length of the original elastic member 122 can be reduced to reduce the overall volume of the brake device 100 while obtaining the same elastic force.

[0115] In some embodiments, referring to FIGS. 2 to 4, the brake device 100 further comprises a brake seat 150.

[0116] The original brake piston 121 and the brake seat 150 form a sliding connection. An original piston cavity 120a is formed between the original brake piston 121 and the brake seat 150, and the original brake piston 121 slides relative to the brake seat 150 when the original piston cavity 120a is filled or drained with hydraulic oil.

[0117] With such a scheme, when the original piston cavity 120a is drained, the original brake piston 121 moves in a direction close to the first friction assembly under the action of the first pressure of the original elastic member 122, and as the hydraulic oil continues to be released, the original brake piston 121 presses the first friction assembly to generate the first type of braking force, thereby playing the role of a parking brake.

[0118] When the prime piston cavity 120a is filled with hydraulic oil, the prime brake piston 121 moves away from the first friction assembly under the pressure of the hydraulic oil. With the continuous compression of the prime elastic member 122, the pressure of the prime brake piston 121 on the first friction assembly continuously decreases, and finally the parking is released.

[0119] In some embodiments, referring to FIG. 1, FIG. 7 and FIG. 9, the brake seat 150 further has a first flow channel 151a.

[0120] One end of the first flow channel 151a is communicated to the prime piston cavity 120a, and the other end is communicated to an external pipeline, for realizing the filling and draining of the prime piston cavity 120a.

[0121] It can be understood that the prime piston cavity 120a can realize the filling and draining through the same first flow channel 151a. Alternatively, the prime piston cavity 120a can realize the filling through one first flow channel 151a, and realize the draining through another first flow channel 151a.

[0122] As a specific solution, the brake device 100 further comprises a first liquid exchange connector 161, which is fixedly connected to the brake seat 150, for realizing the connection between the first flow channel 151a and the external pipeline.

[0123] In some embodiments, referring to FIG. 3, FIG. 4 and FIG. 6, the transmission brake assembly 100b comprises a second friction plate set 130 and a transmission brake piston 141.

[0124] The second friction plate set 130 is combined to the transmission shaft and is configured to generate a second type of braking force under pressure. The transmission brake piston 141 is used to release or provide the second pressure to the second friction plate set 130.

[0125] It can be understood that the second pressure can be provided by the transmission brake piston 141 in the manner of pressing the second friction plate set 130; or the second pressure is provided by other pressure components, such as springs, and the transmission brake piston 141 is used to act on the pressure components to release the second pressure of the second friction plate set 130.

[0126] In some embodiments, referring to FIG. 3, FIG. 4 and FIG. 6, the transmission brake assembly 100b further comprises a transmission elastic member 142. The transmission elastic member 142 is combined to the transmission brake piston 141 and is used to provide or release the second pressure. Through the cooperation of the transmission elastic member 142 and the transmission brake piston 141, the provision and release of the second pressure are realized.

[0127] Exemplarily, the transmission elastic member 142 is a compression spring, and the transmission elastic member 142 is arranged on the side of the transmission brake piston 141 close to the second friction plate set 130. The second pressure is provided by the transmission brake piston 141, and the transmission elastic member 142 biases the transmission brake piston 141, so that the transmission brake piston 141 has a tendency to move away from the second friction plate set 130.

[0128] As a specific solution, referring to FIGS. 3, 4 and 6, the brake device 100 further comprises a support member 143.

[0129] The support member 143 forms a limiting boss 143a to abut against the transmission elastic member 142; the transmission elastic member 142 is sleeved on the support member 143, and one end of the support member 143 away from the limiting boss 143a is fixedly connected to the brake seat 150. The support member 143 is provided to stabilize the shape.

[0130] Exemplarily, the one end of the support member 143 away from the limiting boss 143a is fixedly connected to the brake seat 150 after penetrating through the transmission brake piston 141.

[0131] In some embodiments, referring to FIGS. 3, 4, 6 and 9, a plurality of transmission elastic members 142 are provided, and the plurality of transmission elastic members 142 are arranged at intervals in the circumferential direction of the transmission brake piston 141 to provide uniform elastic force to the transmission brake piston 141 in the circumferential direction.

[0132] In some embodiments, referring to FIGS. 3, 4 and 6, the transmission brake piston 141 and the brake seat 150 form a sliding connection. A transmission piston cavity 140a is formed between the transmission brake piston 141 and the brake seat 150, and the transmission brake piston 141 slides relative to the brake seat 150 when the transmission piston cavity 140a is filled with oil or drained.

[0133] It can be understood that the transmission brake assembly 100b shares one brake seat 150 with the prime brake assembly 100a; or the transmission brake assembly 100b and the prime brake assembly 100a are arranged in different brake seats 150, respectively.

[0134] With such a solution, when the transmission piston cavity 140a is filled with oil, the transmission brake piston 141 compresses the transmission elastic member 142 while pressing the second friction plate set 130 under the pressure of the hydraulic oil, thereby playing a role of service brake.

[0135] When the transmission piston cavity 140a is drained, the pressure of the hydraulic oil in the transmission piston cavity 140a is released, and the transmission brake piston 141 moves away from the second friction plate set 130 under the elastic action of the transmission elastic member 142, thereby finally releasing the service brake.

[0136] In some embodiments, referring to FIG. 1, FIG. 8 and FIG. 12, the brake seat 150 further has a second flow channel 152a.

[0137] The second flow channel 152a is communicated to the transmission piston cavity 140a at one end and to an external pipeline at the other end, for realizing oil charging and / or oil discharging of the transmission piston cavity 140a.

[0138] It can be understood that the transmission piston cavity 140a can realize oil charging and oil discharging through the same second flow channel 152a. Alternatively, the transmission piston cavity 140a can realize oil charging through one second flow channel 152a and realize oil discharging through another second flow channel 152a.

[0139] As a specific solution, referring to FIG. 1 and FIG. 8, the brake device 100 further comprises a second liquid exchange connector 162, which is fixedly connected to the brake seat 150, for realizing connection of the second flow channel 152a with the external pipeline.

[0140] As a preferred solution, referring to FIG. 1 and FIG. 8, the brake device 100 further comprises an air exchange connector 163, which is communicated to the transmission piston cavity 140a, for realizing at least air exhaust of the transmission piston cavity 140a.

[0141] In some embodiments, referring to FIG. 2 and FIG. 3, the brake seat 150 has a seat inner space 150a; the prime brake assembly 100a and / or the transmission brake assembly 100b is arranged in the seat inner space 150a.

[0142] It can be understood that the prime brake assembly 100a and the transmission brake assembly 100b can be installed in the seat inner space 150a of the same brake seat 150, or installed in different brake seats 150. That is, the installation mode of the prime brake assembly 100a and the transmission brake assembly 100b can be selected according to actual needs.

[0143] As a preferred solution, referring to FIG. 2 and FIG. 3, the prime brake assembly 100a and the transmission brake assembly 100b are installed in the seat inner space 150a of the same brake seat 150, and the directions of the first pressure and the second pressure are opposite.

[0144] It can be understood that the moving direction of the prime brake piston 121 when exerting the first pressure on the first friction plate set 110 is opposite to the moving direction of the transmission brake piston 141 when exerting the second pressure on the second friction plate set 130. In this way, on the basis of the dispersion design of the two brake assemblies, the adoption of such pressure directions can avoid mutual interference of the prime brake piston 121 and the transmission brake piston 141 when moving.

[0145] In some embodiments, referring to FIGS. 2 and 3, the primary brake piston 121 and the transmission brake piston 141 are located between the first friction plate set 110 and the second friction plate set 130. With such an arrangement, the space between the two first friction plate sets 110 and the second friction plate set 130 can be fully utilized, and the axial space occupied by the brake device 100 can be reduced.

[0146] In some embodiments, referring to FIGS. 2 and 3, the primary brake piston 121 and the transmission brake piston 141 axially slide along the same central axis C1. That is, the axis of the primary shaft 211 to which the primary brake assembly 100a is connected coincides with the axis of the transmission shaft to which the transmission brake assembly 100b is connected. With such an arrangement, the installation of the brake device 100 is facilitated, and additional radial space occupied by the brake device 100 is reduced.

[0147] In some embodiments, referring to FIGS. 2 to 4, at least part of the primary brake piston 121 and at least part of the transmission brake piston 141 are located at the same axial position. That is, the projection of the primary brake piston 121 on the central axis C1 at least partially coincides with the projection of the transmission brake piston 141 on the central axis C1.

[0148] With such an arrangement, the axial space required by the primary brake piston 121 and the transmission brake piston 141 as a whole is reduced, and the structure is compact.

[0149] In some embodiments, referring to FIGS. 2 to 4, the brake seat 150 comprises a first base body 151 and a second base body 152.

[0150] The primary brake piston 121 and the first base body 151 form a sliding connection, and the primary brake piston 121 is supported by the first base body 151, thereby improving the stability of the primary brake piston 121 when moving. The transmission brake piston 141 and the second base body 152 form a sliding connection, thereby improving the stability of the transmission brake piston 141 when moving. The first base body 151 and the second base body 152 have a spacing therebetween. By providing the first base body 151 and the second base body 152, the primary brake piston 121 and the transmission brake piston 141 are respectively supported, avoiding mutual interference, improving heat dissipation, and reducing assembly difficulty.

[0151] The primary brake piston 121 and / or the transmission brake piston 141 are located between the first base body 151 and the second base body 152. It can be understood that at least one of the primary brake piston 121 and the transmission brake piston 141 is located between the first base body 151 and the second base body 152.

[0152] Exemplarily, the motive brake piston 121 is located between the first base body 151 and the second base body 152, and at least part of the motive brake piston 121 is capable of axially passing through the first base body 151 to contact the first friction assembly. The motive brake piston 121 is located on the side of the second base body 152 close to the second friction plate set 130.

[0153] With such a scheme, the movements of the motive brake piston 121 and the transmission brake piston 141 are separated, mutual interference is avoided, the reliability of the brake device 100 is improved, and the spatial arrangement of the brake device 100 is more compact.

[0154] As a specific scheme, referring to FIGS. 2 to 4, the motive piston cavity 120a is formed between the motive brake piston 121 and the first base body 151, and the first base body 151 is formed with a first flow channel 151a. The brake device 100 further comprises a first sealing ring 164, and a plurality of first sealing rings 164 are arranged between the motive brake piston 121 and the first base body 151 to seal the motive piston cavity 120a.

[0155] The transmission piston cavity 140a is formed between the transmission brake piston 141 and the second base body 152, and the second base body 152 is formed with a second flow channel 152a. The brake device 100 further comprises a second sealing ring 165, and a plurality of second sealing rings 165 are arranged between the transmission brake piston 141 and the second base body 152 to seal the transmission piston cavity 140a.

[0156] In some embodiments, referring to FIGS. 3 and 4, an active space 150b is formed between the first base body 151 and the second base body 152, and at least part of the motive brake piston 121 is located in the active space 150b. The motive elastic member 122 is used to bias the motive brake piston 121, and the motive elastic member 122 abuts between the motive brake piston 121 and the second base body 152.

[0157] With such a scheme, the second base body 152 is reused as the abutting reference of the motive elastic member 122, which is beneficial to the assembly of the motive elastic member 122 while avoiding the addition of a redundant spring seat, so that the structure is compact.

[0158] As a specific scheme, referring to FIGS. 3, 4, 10 and 11, the motive brake piston has a first accommodating groove 121a, the second base body 152 has a second accommodating groove 152b, and the first accommodating groove 121a and the second accommodating groove 152b correspond one by one. One end of the motive elastic member 122 extends into the first accommodating groove 121a, and the other end of the motive elastic member 122 extends into the second accommodating groove 152b.

[0159] With such an arrangement, not only the first accommodating groove 121a and the second accommodating groove 152b can be used to constrain the original elastic member 122, so that the original elastic member 122 provides a stable elastic force in the direction parallel to the central axis C1, but also a part of the length of the original elastic member 122 is located at the same axial position as the original brake piston 121 and the second base body 152, thereby reducing the size of the brake device 100 in the axial direction.

[0160] In some embodiments, referring to FIG. 3 and FIG. 4, at least part of the first base body 151 and at least part of the second base body 152 are located at the same axial position. That is, the projection of the first base body 151 on the central axis C1 at least partially overlaps with the projection of the second base body 152 on the central axis C1.

[0161] With such an arrangement, the axial space required by the first base body 151 and the second base body 152 as a whole is reduced, and the structure is compact.

[0162] In some embodiments, referring to FIG. 2 and FIG. 4, the brake seat 150 further comprises an outer housing 153.

[0163] The outer housing 153 is formed with a seat inner space 150a, and the first base body 151 and the second base body 152 are respectively located in the seat inner space 150a, and the first base body 151 and the second base body 152 are respectively and independently fixed to the outer housing 153. In this way, there is no direct action between the first base body 151 and the second base body 152, which reduces the mutual influence of the original brake assembly 100a and the transmission brake assembly 100b, and improves the reliability.

[0164] As a specific scheme, referring to FIG. 3, FIG. 10 and FIG. 11, the second base body 152 is provided with a plurality of bolt holes 152c along the circumference, and is fixed to the outer housing 153 by a plurality of bolts. Compared with the way of limiting by a check ring, the fixing by bolts is convenient to install and disassemble, and the positioning is more accurate.

[0165] As a specific scheme, referring to FIG. 3 and FIG. 4, the brake seat 150 further comprises a baffle plate 154. The baffle plate 154 is combined to a predetermined axial position of the outer housing 153; specifically, one side of the baffle plate 154 abuts against a stepped structure on the inner wall of the outer housing 153 in the axial direction, and the other side is limited by a check ring.

[0166] The first base body 151 is fixedly connected to the baffle plate 154. Specifically, the first base body 151 is fixed to the baffle plate 154 by bolts, which is convenient to install and disassemble, and the positioning is more accurate.

[0167] In some embodiments, referring to FIG. 3 and FIG. 5, the brake seat 150 further has a flow passage 150c.

[0168] The through-flow passage 150c is used to communicate the inner space 150a of the brake seat with the outside, so that the oil outside can exchange heat with at least one of the prime brake assembly 100a and the transmission brake assembly 100b in the inner space 150a of the brake seat.

[0169] It can be understood that the through-flow passage 150c can be used to exchange oil with the outside through an oil line, or can be communicated with a cavity containing oil outside.

[0170] In this way, by arranging the through-flow passage 150c, at least one of the prime brake assembly 100a and the transmission brake assembly 100b is cooled, the heat dissipation effect is improved, and the braking performance is improved.

[0171] As a specific scheme, referring to FIGS. 2, 3 and 5, the transmission shaft is connected with a speed reduction mechanism 250, and the through-flow passage 150c is communicated to a speed reduction cavity 252a of the speed reduction mechanism 250. In this way, the cooling of the brake device 100 is realized by using the lubricating oil in the speed reduction cavity 252a of the speed reduction mechanism 250, and the additional oil line can be reduced.

[0172] Considering that the transmission brake assembly 100b is used for service braking, a large amount of heat will be generated during braking, that is, the transmission brake assembly 100b is the main heat source of the brake device 100. As a specific scheme, referring to FIGS. 3 and 5, the distance between the transmission brake assembly 100b and the through-flow passage 150c is smaller than the distance between the prime brake assembly 100a and the through-flow passage 150c.

[0173] That is, the second friction plate set 130 is closer to the through-flow passage 150c than the first friction plate set 110, and the oil entering through the through-flow passage 150c is mainly used to lubricate the second friction plate set 130.

[0174] As a specific scheme, referring to FIGS. 3 to 5, the second friction plate set 130 includes first friction plates 131 and second friction plates 132. The first friction plates 131 are respectively rotationally connected to the brake seat 150 and are axially slidably arranged relative to the brake seat 150; the second friction plates 132 are respectively rotationally connected to the transmission shaft and are axially slidably arranged relative to the prime shaft 211; the first friction plates 131 and the second friction plates 132 are configured to brake the prime shaft 211 by friction.

[0175] For example, the first friction plate 131 is spline-fitted with the brake seat 150, and specifically, the second base body 152 is provided with a spline groove 152d matched with the first friction plate 131, and the second friction plate 132 is rotationally matched with the transmission shaft through a synchronizing piece 135, which can be a spline sleeve.

[0176] Optionally, the first friction plate 131 is made of steel, and the material of the first friction plate 131 includes at least one of the following: an asbestos material, a non-asbestos organic (NAO) friction material, a semi-metallic material, a ceramic material, a powder metallurgy friction material, and a carbon fiber friction material.

[0177] The second friction plate set 130 further includes a guide pin 133 and a reset member 134. The plurality of first friction plates 131 are connected in series by the guide pin 133, one end of the guide pin 133 is inserted into the outer housing 153, and the other end is inserted into the second base body 152. The sliding of the first friction plate 131 is guided by the guide pin 133. The reset member 134 is arranged between adjacent first friction plates 131. When the second pressure on the second friction plate set 130 is released, the reset member 134 can separate the first friction plate 131 and the second friction plate 132.

[0178] Exemplarily, the reset member 134 is a compression spring, and the reset member 134 is sleeved on the guide pin 133.

[0179] The structure of the first friction plate set 110 is similar to that of the second friction plate set 130, and will not be described here.

[0180] Exemplarily, the working process of the brake device 100 is described as follows:

[0181] When the service brake is needed, the hydraulic oil enters from the second hydraulic oil connector 162, enters the transmission piston cavity 140a along the second flow channel 152a, and as the hydraulic pressure in the transmission piston cavity 140a continues to increase, the transmission brake piston 141 presses the second friction plate set 130 against the elastic force of the transmission elastic member 142. Since the second friction plate set 130 is connected to the primary transmission shaft 220, the second type of braking force acts on the primary transmission shaft 220, thereby achieving service braking.

[0182] When the service brake needs to be released, the hydraulic pressure in the transmission piston cavity 140a is released, and the transmission brake piston 141 moves in the direction of the second friction plate set 130 under the action of the transmission elastic member 142. At this time, the reset member 134 separates the friction plates, and the service brake is released.

[0183] When the parking brake is needed, the hydraulic oil in the prime piston cavity 120a is discharged along the first flow channel 151a and the first hydraulic oil connector 161, and under the action of the prime elastic member 122, the prime brake piston 121 will press the first friction plate set 110. Since the first friction plate set 110 is connected to the prime shaft 211, the first type of braking force acts on the prime shaft 211, thereby achieving parking braking.

[0184] When the parking brake needs to be released, hydraulic oil enters the prime mover piston cavity 120a from the first hydraulic connector 161 and the first flow channel 151a, and the prime mover piston cavity 120a is pushed by the hydraulic pressure to move the prime mover brake piston 121 in the direction of compressing the prime elastic element 122; as the hydraulic oil continues to enter, the first pressure provided by the prime elastic element 122 is released, at which time the friction plates in the first friction plate set 110 are separated, and the parking brake is released.

[0185] According to a second aspect of the present application, referring to FIG. 1 and FIG. 2, a drive axle 10 is provided, which comprises the above-mentioned brake device 100. The drive axle 10 has all the beneficial effects of the above-mentioned brake device 100, which will not be repeated here.

[0186] In some embodiments, referring to FIG. 1 to FIG. 3, the drive axle 10 further comprises a prime mover shaft 211 and a transmission shaft. The prime mover shaft 211 is configured to rotate under the drive of a prime mover 210, and the transmission shaft is in transmission coupling with the prime mover shaft 211.

[0187] Specifically, the prime mover shaft 211 can be a shaft directly driven by the prime mover 210. The transmission shaft can be a primary transmission shaft 220 or a secondary transmission shaft 251, wherein the primary transmission shaft 220 can be understood as having a similar or same rotation speed as the prime mover shaft 211, for example, the primary transmission shaft 220 is connected with the prime mover shaft 211 through a differential 230. The secondary transmission shaft 251 is at least one stage of speed reduction relative to the primary transmission shaft 220.

[0188] In some embodiments, referring to FIG. 1 to FIG. 3, the prime mover 210 is arranged between two transmission brake assemblies 100b. By arranging the transmission brake assemblies 100b on both sides of the prime mover 210, the effect of the service brake is ensured.

[0189] In some embodiments, referring to FIG. 1 to FIG. 3, the prime mover 210 is arranged between the prime brake assembly 100a and the transmission brake assembly 100b.

[0190] For example, one prime brake assembly 100a and one transmission brake assembly 100b are arranged on one side of the prime mover 210, and only another transmission brake assembly 100b is arranged on the other side of the prime mover 210. The parking brake is realized by the cooperation of the prime brake assembly 100a and the prime mover shaft 211, and the brake is realized by the cooperation of the transmission brake assemblies 100b arranged on both sides of the prime mover 210. By adopting such an arrangement, one set of prime brake assemblies 100a can be saved, and the heat dissipation efficiency of the transmission brake assemblies 100b can be improved.

[0191] In some embodiments, referring to FIG. 1 to FIG. 3, the prime mover shaft 211 is configured as a motor output shaft, and the prime mover shaft 211 has an axial hole 211a penetrating through the prime mover shaft 211.

[0192] The drive axle 10 further comprises a differential 230 and an intermediate shaft 241.

[0193] The differential 230 is located between the prime mover 210 and the transmission brake assembly 100b, and is configured to transmit power from the prime shaft 211 to two transmission shafts. The intermediate shaft 241 is rotatably arranged in the shaft hole 211a, and is configured to be in transmission connection with the differential 230 and one of the transmission shafts.

[0194] Specifically, the differential 230 comprises a differential housing 231, a first planetary gear 232, and an output gear 233.

[0195] The differential housing 231 is rotationally connected to the prime shaft 211, and rotates synchronously with the prime shaft 211. The first planetary gear 232 is rotationally connected to the differential housing 231. The output gear 233 is provided in two, and each of the two output gears 233 is in meshing connection with the first planetary gear 232. One of the output gears 233 is rotationally connected to the primary transmission shaft 220 on the side of the prime mover 210, and the other output gear 233 is rotationally connected to the intermediate shaft 241, which is arranged through the shaft hole 211a and rotationally connected to the primary transmission shaft 220 on the other side of the prime mover 210.

[0196] As a specific solution, referring to FIGS. 3 and 4, the intermediate shaft 241 and the primary transmission shaft 220 are rotationally connected through a connecting piece 242, which can be one of a spline sleeve, a shaft coupling, etc.

[0197] The connecting piece 242 is located at the same axial position as at least one of the prime brake piston 121, the transmission brake piston 141, the first base body 151, and the second base body 152, and the first friction plate set 110 and the second friction plate set 130 are located on the two sides of the connecting piece 242, respectively. With such an arrangement, the axial space occupied by the connecting piece 242 is fully utilized, and the compactness of the structure is improved.

[0198] In some embodiments, referring to FIGS. 1 to 3, the drive axle 10 further comprises a speed reduction mechanism 250. The speed reduction mechanism 250 comprises a secondary transmission shaft 251, a speed reduction housing 252, a sun gear 254, a second planetary gear 255, and a planet carrier 256.

[0199] The primary transmission shaft 220 has or is connected with a primary driving gear 221; the secondary transmission shaft 251 has a secondary driven gear 251a engaged with the primary driving gear 221. The reduction housing 252 is fixedly connected to the brake seat 150, and a reduction cavity 252a is formed in the reduction housing 252, the sun gear 254, the second planetary gear 255, and at least part of the planet carrier 256 are located in the reduction cavity 252. The inner wall of the reduction housing 252 has a ring gear 253. The sun gear 254 is in interference fit or spline fit with the secondary transmission shaft 251 to achieve rotation-stopping fit. The power is transmitted to the sun gear 254 after being reduced by the primary driving gear 221 and the primary driven gear, and then the sun gear 254 rotates synchronously with the secondary transmission shaft 251. The second planetary gear 255 is provided in plurality and is distributed at intervals in the circumferential direction of the sun gear 254 and simultaneously engaged with the sun gear 254 and the ring gear 253. The planetary gear 255 is rotatably connected to the planet carrier 256 through a planet shaft 257, and the power is output by the planet carrier 256, and the planet carrier 256 is used for being connected to the wheel to drive the wheel.

[0200] According to a third aspect of the present application, a vehicle is provided, which comprises the drive axle 10 described above, and has all the beneficial effects of the drive axle 10 described above, which will not be repeated herein. The vehicle can be a forklift truck, and the present application can meet the requirements of the forklift truck on driving braking force and parking braking force.

[0201] In the description of the present application, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0202] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0203] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0204] The above is only the preferred embodiment of the present application, and does not limit the present application in any form, but any simple modification, equivalent change and modification made according to the technical essence of the present application without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A brake device (100) comprising: a prime mover brake assembly (100a) configured to provide a first type of braking force to a prime mover shaft (211) in a vehicle; and a transmission brake assembly (100b) configured to provide a second type of braking force to a transmission shaft in a vehicle; wherein the prime mover brake assembly (100a) is connected to the prime mover shaft (211) and the transmission brake assembly (100b) is connected to the transmission shaft. The prime mover brake assembly (100a) comprises:

2. The brake device (100) according to claim 1, wherein a first friction plate set (110) configured to generate the first type of braking force under pressure; and a prime mover brake piston (121) configured to release or provide a first pressure to the first friction plate set (110); wherein the first friction plate set (110) is coupled to the prime mover shaft (211). The prime mover brake assembly (100a) further comprises:

3. The brake device (100) according to claim 2, wherein a prime mover elastic member (122) configured to provide or release the first pressure; wherein the prime mover elastic member (122) is coupled to the prime mover brake piston (121). The brake device (100) further comprises:

4. The brake device (100) according to claim 2 or 3, wherein a brake seat (150) in sliding connection with the prime mover brake piston (121); wherein a prime mover piston cavity (120a) is formed between the prime mover brake piston (121) and the brake seat (150), and the prime mover brake piston (121) slides relative to the brake seat (150) when the prime mover piston cavity (120a) is filled with oil or drained. The brake seat (150) further has:

5. The brake device (100) according to claim 4, wherein a first flow channel (151a) for filling and / or draining the prime mover piston cavity (120a); wherein one end of the first flow channel (151a) is in communication with the prime mover piston cavity (120a) and the other end is in communication with an external pipeline. The transmission brake assembly (100b) comprises:

6. The braking device (100) according to any one of claims 1 to 5, wherein a second friction plate set (130) configured to generate the second type of braking force under pressure; and a transmission brake piston (141) configured to release or provide a second pressure to the second friction plate set (130); wherein the second friction plate set (130) is coupled to the transmission shaft. The transmission brake assembly (100b) further comprises:

7. The brake device (100) according to claim 6, wherein a transmission elastic member (142) configured to provide or release the second pressure; wherein the transmission elastic member (142) is coupled to the transmission brake piston (141). The brake device (100) further comprises:

8. The brake device (100) according to claim 6 or 7, wherein a brake seat (150) in sliding connection with the transmission brake piston (141); wherein a transmission piston cavity (140a) is formed between the transmission brake piston (141) and the brake seat (150), and the transmission brake piston (141) slides relative to the brake seat (150) when the transmission piston cavity (140a) is filled with oil or drained. The brake seat (150) further has:

9. The brake device (100) according to claim 8, wherein a second flow channel (152a) for filling and / or draining the transmission piston cavity (140a); ​ The second flow channel (152a) is communicated to the transmission piston cavity (140a) at one end and to an external pipeline at the other end.

10. The braking device (100) according to any one of claims 1 to 9, wherein The brake device (100) comprises: a brake seat (150) having a seat inner space (150a); The original brake assembly (100a) and / or the transmission brake assembly (100b) are arranged in the seat inner space (150a).

11. The braking device (100) according to claim 10, wherein The original brake assembly (100a) comprises: a first friction plate group (110) configured to generate a first type of braking force under pressure; an original brake piston (121) for removing or providing a first pressure to the first friction plate group (110); The transmission brake assembly (100b) comprises: a second friction plate group (130) configured to generate a second type of braking force under pressure; a transmission brake piston (141) for providing or removing a second pressure to the second friction plate group (130); The first pressure and the second pressure are in opposite directions.

12. The braking device (100) according to claim 11, wherein The original brake piston (121) and the transmission brake piston (141) are located between the first friction plate group (110) and the second friction plate group (130).

13. The braking device (100) according to claim 12, wherein The original brake piston (121) and the transmission brake piston (141) slide along the same central axis (C1) in the axial direction.

14. The braking device (100) according to claim 13, wherein At least part of the original brake piston (121) and at least part of the transmission brake piston (141) are located at the same axial position.

15. The braking device (100) according to claim 13 or 14, wherein The brake seat (150) comprises: a first base body (151) and a second base body (152), wherein the original brake piston (121) and the transmission brake piston (141) are in sliding connection with the first base body (151) and the second base body (152), respectively; The original brake piston (121) and / or the transmission brake piston (141) are located between the first base body (151) and the second base body (152). An active space (150b) is formed between the first base body (151) and the second base body (152), and at least part of the original brake piston (121) is located inside the active space (150b).

16. The braking device (100) according to claim 15, wherein The brake device (100) further comprises: an original elastic member (122) for biasing the original brake piston (121); The original elastic member (122) abuts between the original brake piston (121) and the second base body (152). At least part of the first base body (151) and at least part of the second base body (152) are located at the same axial position.

17. The braking device (100) according to claim 15 or 16, wherein The brake seat (150) further comprises:

18. The braking device (100) according to any one of claims 15 to 17, wherein an outer housing (153) forming the seat inner space (150a); The first base body (151) and the second base body (152) are respectively located in the seat inner space (150a), and the first base body (151) and the second base body (152) are respectively and independently fixed to the outer housing (153). The second base body (152) is fixed to the outer housing (153) by a plurality of bolts.

19. The braking device (100) according to claim 18, wherein The brake seat (150) further comprises:

20. The braking device (100) according to claim 18 or 19, wherein ​ a baffle (154) combined to a predetermined axial position of the outer housing (153); wherein the first base (151) is fixedly connected to the baffle (154).

21. The braking device (100) according to any one of claims 10 to 20, wherein The brake seat (150) further has: a flow passage (150c) for communicating the inner space (150a) with the outside, so that the oil outside can exchange heat with the prime mover braking assembly (100a) and / or the transmission braking assembly (100b) in the inner space (150a).

22. The braking device (100) according to claim 20, wherein The transmission shaft is connected with a reduction mechanism (250), and the flow passage (150c) is communicated to a reduction chamber (252a) of the reduction mechanism (250).

23. A drive axle (10) comprising the brake device (100) according to any one of claims 1 to 22.

24. The drive axle (10) of claim 23, wherein, The drive axle (10) further comprises: a prime mover shaft (211) configured to rotate under the drive of a prime mover (210); a transmission shaft in transmission coupling with the prime mover shaft (211).

25. The drive axle (10) of claim 24, wherein, The prime mover (210) is arranged between the two transmission braking assemblies (100b).

26. The drive axle (10) according to claim 24 or 25, wherein The prime mover (210) is arranged between the prime mover braking assembly (100a) and the transmission braking assembly (100b).

27. Drive axle (10) according to any one of claims 24 to 26, wherein The prime mover shaft (211) is configured as a motor output shaft, and the prime mover shaft (211) has an axial through hole (211a); The drive axle (10) further comprises: a differential (230) for transmitting the power of the prime mover shaft (211) to the two transmission shafts; an intermediate shaft (241) rotatably penetrating the axial through hole (211a) to be in transmission connection with the differential (230) and one of the transmission shafts, respectively; wherein the differential (230) is located between the prime mover (210) and the transmission braking assembly (100b).

28. A vehicle comprising: The brake device (100) according to any one of claims 1 to 22 or the drive axle (10) according to any one of claims 23 to 27.

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