Braking device, drive axle and vehicle

Abstract

The application relates to a brake device, a drive axle and a vehicle, wherein the brake device comprises: a prime mover brake assembly used for providing a first type of brake force to a prime mover shaft in a vehicle; and a transmission brake assembly used for providing a second type of brake force to a transmission shaft in the vehicle; wherein the prime mover brake assembly is connected to the prime mover shaft, and the transmission brake assembly is connected to the transmission shaft. The application has the beneficial effect of providing a brake device, a drive axle and a vehicle which can meet different brake requirements by applying different brake forces to the prime mover shaft and the transmission shaft of the vehicle.

Description

Braking system, drive axle and vehicle Technical Field

[0001] This application relates to the field of brake technology, and more particularly to a braking device, drive axle, and vehicle. Background Technology

[0002] Most current vehicle braking systems employ a combination of service brakes and parking brakes. Existing technology integrates the service brake and parking brake onto the same axle, applying different braking forces to the same axle. However, this braking scheme cannot effectively adapt to different braking demands, resulting in poor braking performance. Summary of the Invention

[0003] This application provides a braking device that improves the braking performance of the braking device, thereby at least partially solving the above-mentioned technical problems.

[0004] To achieve the above objectives, according to a first aspect of this application, a braking device is provided, comprising:

[0005] A prime mover braking assembly is used to provide a first-class braking force to a prime mover axle in a vehicle;

[0006] A transmission braking assembly for providing a second type of braking force to a drive shaft in a vehicle;

[0007] The prime mover brake assembly is connected to the prime mover shaft, and the transmission brake assembly is connected to the transmission shaft.

[0008] Optionally, the prime mover braking assembly includes:

[0009] The first friction plate group is configured to generate a first type of braking force under pressure;

[0010] The prime mover brake piston is used to release or provide the first pressure to the first friction plate group;

[0011] The first friction plate group is coupled to the prime mover shaft.

[0012] Optionally, the prime mover braking assembly further includes:

[0013] A prime mover elastic element is used to provide or release the first pressure;

[0014] The prime mover elastic element is coupled to the prime mover brake piston.

[0015] Optionally, the braking device further includes:

[0016] The brake seat, wherein the prime mover brake piston is slidably connected to the brake seat;

[0017] The prime mover brake piston and the brake seat form a prime mover piston chamber, and the prime mover brake piston slides relative to the brake seat when the prime mover piston chamber is filled with oil or drained with oil.

[0018] Optionally, the brake seat further comprises:

[0019] The first flow channel is used to realize the filling and / or draining of the prime mover piston chamber;

[0020] The first flow channel is connected at one end to the prime mover piston chamber and at the other end to an external pipeline.

[0021] Optionally, the transmission braking assembly includes:

[0022] The second friction plate assembly is configured to generate a second type of braking force under pressure.

[0023] A transmission brake piston is used to release or provide a second pressure to the second friction plate assembly;

[0024] The second friction plate assembly is connected to the drive shaft.

[0025] Optionally, the transmission braking assembly further includes:

[0026] A transmission elastic element, used to provide or release the second pressure;

[0027] The transmission elastic element is coupled to the transmission braking piston.

[0028] Optionally, the braking device further includes:

[0029] The brake seat, wherein the transmission brake piston is slidably connected to the brake seat;

[0030] A transmission piston cavity is formed between the transmission brake piston and the brake seat, and the transmission brake piston slides relative to the brake seat when the transmission piston cavity is filled with or drained with oil.

[0031] Optionally, the brake seat further comprises:

[0032] The second flow channel is used to fill and / or drain the transmission piston chamber;

[0033] The second flow channel is connected at one end to the transmission piston cavity and at the other end to an external pipeline.

[0034] Optionally, the braking device includes:

[0035] Brake seat, having internal space;

[0036] The prime mover brake assembly and / or the transmission brake assembly are disposed within the seat space.

[0037] Optionally, the prime mover braking assembly includes:

[0038] The first friction plate group is configured to generate a first type of braking force under pressure;

[0039] The prime mover brake piston is used to release or provide the first pressure to the first friction plate group;

[0040] The transmission braking assembly includes:

[0041] The second friction plate assembly is configured to generate a second type of braking force under pressure.

[0042] The transmission brake piston is used to provide or release the second pressure to the second friction plate assembly;

[0043] The first pressure and the second pressure are in opposite directions.

[0044] Optionally, both the prime mover brake piston and the transmission brake piston are located between the first friction plate group and the second friction plate group.

[0045] Optionally, the prime mover brake piston and the transmission brake piston slide axially along the same central axis.

[0046] Optionally, at least a portion of the prime mover brake piston is located at the same axial position as at least a portion of the drive brake piston.

[0047] Optionally, the brake seat includes:

[0048] The first base body, wherein the prime mover brake piston is slidably connected to the first base body;

[0049] The second base body, wherein the transmission brake piston is slidably connected to the second base body;

[0050] The prime mover brake piston and / or the transmission brake piston are located between the first base and the second base.

[0051] Optionally, an active space is formed between the first base and the second base, and at least a portion of the prime mover piston is located inside the active space;

[0052] The braking device further includes:

[0053] A prime mover elastic element is used to bias the prime mover brake piston;

[0054] The prime mover elastic element abuts against the prime mover brake piston and the second base.

[0055] Optionally, at least a portion of the first substrate is located at the same axial position as at least a portion of the second substrate.

[0056] Optionally, the brake seat further includes:

[0057] The outer shell forms the internal space of the seat;

[0058] The first base and the second base are respectively located in the space inside the seat, and the first base and the second base are respectively independently fixed to the outer shell.

[0059] Optionally, the second base is fixed to the outer casing by a plurality of bolts.

[0060] Optionally, the brake seat further includes:

[0061] A baffle is attached to a predetermined axial position of the outer casing;

[0062] The first substrate is fixedly connected to the baffle.

[0063] Optionally, the brake seat further comprises:

[0064] A flow passage is provided to connect the interior space of the seat with the outside, so that the external oil can exchange heat with the prime mover and / or the transmission brake assembly in the interior space.

[0065] Optionally, the drive shaft is connected to a reduction mechanism, and the flow passage is connected to the reduction chamber of the reduction mechanism.

[0066] According to a second aspect of this application, a drive axle is provided, including the braking device described above.

[0067] Optionally, the drive axle further includes:

[0068] The prime mover shaft is configured to rotate under the drive of a prime mover;

[0069] The drive shaft is coupled with the prime mover shaft.

[0070] Optionally, the prime mover is disposed between the two transmission and braking assemblies.

[0071] Optionally, the prime mover is disposed between the prime mover braking assembly and the transmission braking assembly.

[0072] Optionally, the prime mover shaft is configured as a motor output shaft, and the prime mover shaft has a shaft hole that extends through the shaft in the axial direction;

[0073] The drive axle also includes:

[0074] A differential is used to transmit power from the prime mover shaft to the two drive shafts;

[0075] An intermediate shaft is rotatably inserted through the shaft hole to form a transmission connection with the differential and one of the drive shafts respectively;

[0076] The differential is located between the prime mover and the transmission braking assembly.

[0077] According to a third aspect of this application, a vehicle is also provided, including the drive axle described above.

[0078] The beneficial effects of this application are: it provides a braking device, drive axle, and vehicle that can meet different braking requirements by applying different braking forces to the driving shaft and transmission shaft of the vehicle.

[0079] More specifically, some embodiments of this application may produce the following specific beneficial effects:

[0080] By incorporating a prime mover braking assembly to provide primary braking force to the prime mover shaft in the vehicle, the vehicle's stability can be maintained when stationary. Conversely, by incorporating a drivetrain braking assembly to provide secondary braking force to the drivetrain shaft, a rapid response and effective deceleration or stopping are achieved. This distributed design allows both braking components to focus on their primary functions, better adapting to different braking demands and improving braking performance.

[0081] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0082] 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.

[0083] 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.

[0084] Figure 1 is a schematic diagram of the overall structure of the drive bridge provided in an exemplary embodiment of this application;

[0085] Figure 2 is an internal cross-sectional view of the drive axle provided in an exemplary embodiment of this application;

[0086] Figure 3 is an internal cross-sectional view of a portion of the drive axle provided in an exemplary embodiment of this application;

[0087] Figure 4 is an enlarged schematic diagram of part A in Figure 3;

[0088] Figure 5 is an enlarged schematic diagram of part B in Figure 3;

[0089] Figure 6 is an internal cross-sectional view of another part of the drive axle provided in an exemplary embodiment of this application;

[0090] Figure 7 is an internal cross-sectional view of another part of the drive axle provided in an exemplary embodiment of this application;

[0091] Figure 8 is an internal cross-sectional view of another part of the drive axle provided in an exemplary embodiment of this application;

[0092] Figure 9 is an exploded view of a portion of the braking device provided in an exemplary embodiment of this application;

[0093] Figure 10 is a perspective view of the second substrate in the braking device provided in an exemplary embodiment of this application;

[0094] 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;

[0095] Figure 12 is a cross-sectional structural diagram of the second substrate in the braking device provided in an exemplary embodiment of this application.

[0096] Explanation of reference numerals in the attached figures:

[0097] 100. Braking device;

[0098] 100a, prime mover brake assembly; 110, first friction pad assembly; 120a, prime mover piston chamber; 121, prime mover brake piston; 121a, first receiving groove; 122, prime mover elastic element;

[0099] 100b. Transmission and braking assembly;

[0100] 130. Second friction plate assembly; 131. First friction plate; 132. Second friction plate; 133. Guide pin; 134. Reset component; 135. Synchronizing component;

[0101] 140a, Transmission piston chamber; 141, Transmission brake piston; 142, Transmission elastic element; 143, Support element; 143a, Limiting boss;

[0102] 150, Brake seat; 150a, Seat interior space; 150b, Movement space; 150c, Flow passage;

[0103] 151, First substrate; 151a, First flow channel;

[0104] 152, Second substrate; 152a, Second flow channel; 152b, Second receiving groove; 152c, Bolt hole; 152d, Spline groove;

[0105] 153. Outer shell; 154. Baffle;

[0106] 161. First fluid change connector; 162. Second fluid change connector; 163. Ventilation connector;

[0107] 164. First sealing ring; 165. Second sealing ring;

[0108] C1, Central axis;

[0109] 10. Drive axle;

[0110] 210. Prime mover; 211. Prime mover shaft; 211a. Shaft hole;

[0111] 220. First-stage drive shaft; 221. First-stage drive gear;

[0112] 230. Differential; 231. Differential housing; 232. First planetary gear; 233. Output gear;

[0113] 241. Intermediate shaft; 242. Connecting component;

[0114] 250. Reduction mechanism;

[0115] 251. Secondary drive shaft; 251a. Secondary driven gear; 252. Reduction housing; 252a. Reduction chamber; 253. Gear ring; 254. Sun gear; 255. Second planetary gear; 256. Planet carrier; 257. Planetary shaft. Detailed Implementation

[0116] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0117] According to a first aspect of this application, referring to Figures 1 and 2, this application provides a braking device 100, including: a prime mover braking assembly 100a and a transmission braking assembly 100b.

[0118] The prime mover brake assembly 100a provides a first type of braking force to the prime mover shaft 211 in a vehicle; the drive brake assembly 100b provides a second type of braking force to the drive shaft in a vehicle. Specifically, the prime mover brake assembly 100a is connected to the prime mover shaft 211, and the drive brake assembly 100b is connected to the drive shaft.

[0119] It should be noted that 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, where the primary transmission shaft 220 can be understood as having a similar or the same rotational speed as the prime mover shaft 211. For example, the primary transmission shaft 220 is connected to the prime mover shaft 211 through a differential 230. The secondary transmission shaft 251 undergoes at least one reduction gear relative to the primary transmission shaft 220.

[0120] It is understood that the prime mover 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, depending on different designs or actual working conditions, the functions of the prime mover brake assembly 100a and the transmission brake assembly 100b can be switched as needed, and there is no limitation on this.

[0121] Through the above technical solution, by setting the prime mover braking assembly 100a to provide a first type of braking force to the prime mover shaft 211 in the vehicle, the vehicle's stability can be maintained when the vehicle is stationary; and by setting the transmission braking assembly 100b to provide a second type of braking force to the transmission shaft in the vehicle, a rapid response and effective deceleration or stopping can be achieved. This distributed design allows the two braking assemblies to focus on their primary functions, better adapting to different braking needs and improving braking performance.

[0122] Furthermore, since the transmission braking assembly 100b is used for deceleration, a large amount of heat is generated during the braking process. This application reduces the overall structural complexity of the braking device 100, improves heat dissipation efficiency, and maintains stable braking performance by arranging the prime mover braking assembly 100a on the prime mover shaft 211.

[0123] Meanwhile, by arranging the prime mover brake assembly 100a and the transmission brake assembly 100b on different shafts, the failure of the entire brake device 100 due to transmission shaft failure (such as connection failure between the transmission shaft and the friction pad assembly) can be reduced, thereby improving the reliability of the brake system.

[0124] In some embodiments, referring to Figures 3 and 4, the prime mover brake assembly 100a includes: a first friction pad group 110 and a prime mover brake piston 121.

[0125] The first friction plate assembly 110 is coupled to the prime mover shaft 211 and configured to generate a first type of braking force under pressure. The prime mover brake piston 121 is used to release or provide a first pressure to the first friction plate assembly 110;

[0126] It is understood that the first pressure can be provided by the prime brake piston 121 in a manner that applies pressure to the first friction plate assembly 110; or, the first pressure can be provided by other pressure components, such as a spring, while the prime brake piston 121 acts on the pressure component to release its first pressure on the first friction plate assembly 110.

[0127] In some embodiments, referring to Figures 3 and 4, the prime mover brake assembly 100a further includes a prime mover elastic member 122. The prime mover elastic member 122 is coupled to the prime mover brake piston 121 for providing or releasing a first pressure. The provisioning and releasing of the first pressure is achieved through the cooperation of the prime mover elastic member 122 and the prime mover brake piston 121.

[0128] For example, the prime mover elastic element 122 is a compression spring, and the prime mover elastic element 122 is disposed on the side of the prime mover brake piston 121 away from the first friction plate group 110. The prime mover elastic element 122 provides the first pressure, and the first pressure acts on the first friction plate group 110 through the prime mover brake piston 121.

[0129] In some embodiments, referring to Figures 3, 4, and 9, a plurality of prime mover elastic elements 122 are provided, which are spaced apart in the circumferential direction of the prime mover brake piston 121, providing a uniform elastic force to the prime mover brake piston 121 in the circumferential direction. Optionally, multiple sets of prime mover elastic elements 122 may also be provided in the radial direction of the prime mover brake piston 121 to further increase the magnitude of the elastic force. In this way, while obtaining the same elastic force, the length of the prime mover elastic element 122 can be reduced, thereby reducing the overall volume of the braking device 100.

[0130] In some embodiments, referring to Figures 2 to 4, the braking device 100 further includes a brake seat 150.

[0131] The prime mover brake piston 121 and the brake seat 150 are in a sliding connection. A prime mover piston chamber 120a is formed between the prime mover brake piston 121 and the brake seat 150. The prime mover brake piston 121 slides relative to the brake seat 150 when the prime mover piston chamber 120a is filled with or drained with oil.

[0132] With this scheme, when the prime mover piston chamber 120a releases oil, the prime mover brake piston 121 moves toward the first friction assembly under the first pressure of the prime mover elastic element 122. As the hydraulic oil continues to be released, the prime mover brake piston 121 presses against the first friction assembly to generate the first type of braking force, thus playing the role of parking brake.

[0133] When the prime mover piston chamber 120a is filled with oil, the prime mover brake piston 121 moves away from the first friction assembly under the pressure of the hydraulic oil. As the prime mover elastic element 122 continues to compress, the pressure of the prime mover brake piston 121 on the first friction assembly continues to decrease, and finally the parking is released.

[0134] In some embodiments, referring to FIG1, FIG7 and FIG9, the brake seat 150 further includes: a first flow channel 151a.

[0135] One end of the first flow channel 151a is connected to the prime mover piston chamber 120a, and the other end is connected to an external pipeline, which is used to realize the filling and draining of the prime mover piston chamber 120a.

[0136] It is understood that the prime mover piston chamber 120a can be filled and drained through the same first flow channel 151a. Alternatively, the prime mover piston chamber 120a can be filled with oil through one first flow channel 151a and drained through another first flow channel 151a.

[0137] As a specific solution, the braking device 100 further includes: a first fluid exchange connector 161, which is fixedly connected to the brake seat 150 to realize the connection between the first flow channel 151a and the external pipeline.

[0138] In some embodiments, referring to Figures 3, 4 and 6, the transmission braking assembly 100b includes a second friction pad group 130 and a transmission braking piston 141.

[0139] The second friction plate assembly 130 is coupled to the drive shaft and configured to generate a second type of braking force under pressure. The transmission brake piston 141 is used to release or provide a second pressure to the second friction plate assembly 130.

[0140] It is understood that the second pressure may be provided by the transmission brake piston 141 in a manner that applies pressure to the second friction plate assembly 130; or the second pressure may be provided by other pressure components, such as a spring, while the transmission brake piston 141 acts on the pressure component to release its second pressure on the second friction plate assembly 130.

[0141] In some embodiments, referring to Figures 3, 4, and 6, the transmission braking assembly 100b further includes a transmission elastic member 142. The transmission elastic member 142 is coupled to the transmission braking piston 141 for providing or releasing a second pressure. The provisioning and releasing of the second pressure is achieved through the cooperation of the transmission elastic member 142 and the transmission braking piston 141.

[0142] For example, the transmission elastic element 142 is a compression spring, and the transmission elastic element 142 is disposed on the side of the transmission brake piston 141 near the second friction plate group 130. The second pressure is provided by the transmission brake piston 141, and the transmission elastic element 142 biases the transmission brake piston 141, causing the transmission brake piston 141 to tend to move away from the second friction plate group 130.

[0143] As a specific embodiment, referring to Figures 3, 4 and 6, the braking device 100 further includes a support member 143.

[0144] 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 provides shape stability.

[0145] For example, one end of the support member 143 away from the limiting boss 143a passes through the transmission brake piston 141 and is fixedly connected to the brake seat 150.

[0146] In some embodiments, referring to Figures 3, 4, 6 and 9, a plurality of transmission elastic elements 142 are provided, and the plurality of transmission elastic elements 142 are spaced apart in the circumferential direction of the transmission brake piston 141, providing a uniform elastic force to the transmission brake piston 141 in the circumferential direction.

[0147] In some embodiments, referring to Figures 3, 4, and 6, the transmission brake piston 141 and the brake seat 150 are slidably connected. 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 or drained with oil.

[0148] It can be understood that the transmission braking assembly 100b and the prime mover braking assembly 100a share a brake seat 150; or, the transmission braking assembly 100b and the prime mover braking assembly 100a are respectively disposed in different brake seats 150.

[0149] With this scheme, when the transmission piston chamber 140a is filled with oil, the transmission brake piston 141 compresses the transmission elastic element 142 under the pressure of the hydraulic oil, while simultaneously pressing the second friction plate group 130, thus achieving the function of vehicle braking.

[0150] When the transmission piston chamber 140a is drained, the pressure of the hydraulic oil in the transmission piston chamber 140a is released, and the transmission brake piston 141 moves away from the second friction plate group 130 under the elastic action of the transmission elastic element 142, and finally releases the service brake.

[0151] In some embodiments, referring to FIG1, FIG8 and FIG12, the brake seat 150 further includes a second flow channel 152a.

[0152] The second flow channel 152a is connected at one end to the transmission piston chamber 140a and at the other end to an external pipeline, and is used to realize the filling and / or draining of the transmission piston chamber 140a.

[0153] It is understood that the transmission piston chamber 140a can be filled and drained through the same second flow channel 152a. Alternatively, the transmission piston chamber 140a can be filled with oil through one second flow channel 152a and drained through another second flow channel 152a.

[0154] As a specific embodiment, referring to Figures 1 and 8, the braking device 100 further includes a second fluid exchange connector 162, which is fixedly connected to the brake seat 150 to realize the connection between the second flow channel 152a and the external pipeline.

[0155] As a preferred embodiment, referring to Figures 1 and 8, the braking device 100 further includes a venting connector 163. The venting connector 163 is connected to the transmission piston chamber 140a and is used to at least exhaust air from the transmission piston chamber 140a.

[0156] In some embodiments, referring to Figures 2 and 3, the brake seat 150 has an interior space 150a; the prime brake assembly 100a and / or the transmission brake assembly 100b are disposed in the interior space 150a.

[0157] It is understood that the prime mover brake assembly 100a and the transmission brake assembly 100b can be installed in the same brake seat 150 space 150a, or they can be installed in different brake seats 150. That is, the installation method of the prime mover brake assembly 100a and the transmission brake assembly 100b can be selected according to actual needs.

[0158] As a preferred embodiment, referring to Figures 2 and 3, the prime mover brake assembly 100a and the transmission brake assembly 100b are installed in the seat space 150a of the same brake seat 150, and the first pressure and the second pressure are in opposite directions.

[0159] It is understandable that the direction of movement of the prime mover brake piston 121 when it applies the first pressure to the first friction plate group 110 is opposite to the direction of movement of the transmission brake piston 141 when it applies the second pressure to the second friction plate group 130. In this way, based on the distributed design of the two brake components, adopting such a pressure direction can avoid mutual interference when the prime mover brake piston 121 and the transmission brake piston 141 move.

[0160] In some embodiments, referring to Figures 2 and 3, both the prime mover brake piston 121 and the transmission brake piston 141 are located between the first friction pad group 110 and the second friction pad group 130. This arrangement fully utilizes the space between the two first friction pad groups 110 and the second friction pad group 130, reducing the axial space occupied by the braking device 100.

[0161] In some embodiments, referring to Figures 2 and 3, the prime mover brake piston 121 and the transmission brake piston 141 slide axially along the same central axis C1. That is, the axis of the prime mover shaft 211 connected to the prime mover brake assembly 100a coincides with the axis of the transmission shaft connected to the transmission brake assembly 100b. This arrangement facilitates the installation of the brake device 100 and reduces the additional radial space occupied by the brake device 100.

[0162] In some embodiments, referring to Figures 2 to 4, at least a portion of the prime mover brake piston 121 and at least a portion of the drive brake piston 141 are located at the same axial position. That is, the projection of the prime mover brake piston 121 on the central axis C1 at least partially coincides with the projection of the drive brake piston 141 on the central axis C1.

[0163] This arrangement reduces the overall axial space required for the prime mover brake piston 121 and the transmission brake piston 141, resulting in a compact structure.

[0164] In some embodiments, referring to Figures 2 to 4, the brake seat 150 includes a first base 151 and a second base 152.

[0165] The prime mover brake piston 121 is slidably connected to the first base 151, which supports the prime mover brake piston 121 and improves its stability during movement. The transmission brake piston 141 is slidably connected to the second base 152, which also improves its stability during movement. A gap exists between the first base 151 and the second base 152. The first base 151 and the second base 152 respectively support the prime mover brake piston 121 and the transmission brake piston 141, preventing mutual interference, improving heat dissipation, and reducing assembly difficulty.

[0166] The prime mover brake piston 121 and / or the drive brake piston 141 are located between the first base 151 and the second base 152. It is understood that at least one of the prime mover brake piston 121 and the drive brake piston 141 is located between the first base 151 and the second base 152.

[0167] For example, the prime mover brake piston 121 is located between the first base 151 and the second base 152, and at least a portion of the prime mover brake piston 121 is able to pass axially through the first base 151 and contact the first friction assembly. The prime mover brake piston 121 is located on the side of the second base 152 closer to the second friction plate assembly 130.

[0168] This design separates the movements of the prime mover brake piston 121 and the transmission brake piston 141, avoiding mutual interference, improving the reliability of the brake device 100, and making the spatial arrangement of the brake device 100 more compact.

[0169] As a specific embodiment, referring to Figures 2 to 4, the prime mover piston chamber 120a is formed between the prime mover brake piston 121 and the first base 151, and the first base 151 has a first flow channel 151a. The braking device 100 also includes a first sealing ring 164, and a plurality of first sealing rings 164 are provided between the prime mover brake piston 121 and the first base 151 to seal the prime mover piston chamber 120a.

[0170] The transmission piston cavity 140a is formed between the transmission brake piston 141 and the second base 152, and the second base 152 has a second flow channel 152a. The braking device 100 also includes a second sealing ring 165, and a plurality of second sealing rings 165 are provided between the transmission brake piston 141 and the second base 152 to seal the transmission piston cavity 140a.

[0171] In some embodiments, referring to Figures 3 and 4, a movable space 150b is formed between the first base 151 and the second base 152, and at least a portion of the prime mover brake piston 121 is located within the movable space 150b. The prime mover elastic member 122 is used to bias the prime mover brake piston 121, and the prime mover elastic member 122 abuts between the prime mover brake piston 121 and the second base 152.

[0172] By adopting this approach, the second base 152 is reused as the contact reference for the prime mover elastic element 122. This facilitates the assembly of the prime mover elastic element 122 while avoiding the addition of unnecessary spring seats, resulting in a compact structure.

[0173] As a specific embodiment, referring to Figures 3, 4, 10, and 11, the prime mover brake piston has a first receiving groove 121a, and the second base 152 has a second receiving groove 152b, with the first receiving groove 121a and the second receiving groove 152b corresponding one-to-one. One end of the prime mover elastic member 122 extends into the first receiving groove 121a, and the other end of the prime mover elastic member 122 extends into the second receiving groove 152b.

[0174] By adopting this scheme, not only can the first receiving groove 121a and the second receiving groove 152b constrain the prime mover elastic member 122, so that the prime mover elastic member 122 provides a stable elastic force in the direction parallel to the central axis C1, but also a portion of the prime mover elastic member 122 is positioned axially with the prime mover brake piston 121 and the second base 152, thereby reducing the axial dimension of the braking device 100.

[0175] In some embodiments, referring to Figures 3 and 4, at least a portion of the first substrate 151 and at least a portion of the second substrate 152 are located at the same axial position. That is, the projection of the first substrate 151 onto the central axis C1 at least partially coincides with the projection of the second substrate 152 onto the central axis C1.

[0176] This arrangement reduces the overall axial space required for the first base 151 and the second base 152, resulting in a compact structure.

[0177] In some embodiments, referring to Figures 2 and 4, the brake seat 150 further includes a housing 153.

[0178] The outer casing 153 forms an inner space 150a, in which the first base 151 and the second base 152 are respectively located, and the first base 151 and the second base 152 are independently fixed to the outer casing 153. In this way, there is no direct interaction between the first base 151 and the second base 152, thereby reducing the mutual influence between the prime mover brake assembly 100a and the transmission brake assembly 100b and improving reliability.

[0179] As a specific solution, referring to Figures 3, 10, and 11, the second base 152 is provided with multiple bolt holes 152c along the circumference, and is fixed to the outer shell 153 by multiple bolts. Compared with the method of using retaining rings for limiting, the use of bolts for fixing is not only convenient for installation and disassembly, but also provides more accurate positioning.

[0180] As a specific embodiment, referring to Figures 3 and 4, the brake seat 150 further includes a baffle 154. The baffle 154 is coupled to a predetermined axial position of the housing 153; specifically, one side of the baffle 154 abuts against a stepped structure on the inner wall of the housing 153 along the axial direction, and the other side is limited by a retaining ring.

[0181] The first base 151 is fixedly connected to the baffle 154. Specifically, the first base 151 is fixed to the baffle 154 with bolts, which facilitates installation and disassembly while ensuring more accurate positioning.

[0182] In some embodiments, referring to Figures 3 and 5, the brake seat 150 further includes a flow passage 150c.

[0183] The flow passage 150c is used to connect the seat interior space 150a with the outside so that the external oil can exchange heat with at least one of the prime brake assembly 100a and the transmission brake assembly 100b in the seat interior space 150a.

[0184] It is understandable that the flow channel 150c can be used to exchange oil with the outside through an oil pipeline, or it can be connected to an external chamber that contains oil.

[0185] Thus, by setting up the flow channel 150c, at least one of the prime mover brake assembly 100a and the transmission brake assembly 100b is cooled, improving the heat dissipation effect and enhancing the braking performance.

[0186] As a specific embodiment, referring to Figures 2, 3, and 5, a reduction gear 250 is connected to the drive shaft, and a flow passage 150c is connected to the reduction chamber 252a of the reduction gear 250. In this way, the braking device 100 is cooled by the lubricating oil in the reduction chamber 252a of the reduction gear 250, which reduces the need for additional oil piping.

[0187] Considering that the transmission brake assembly 100b is used for service braking, a large amount of heat will be generated during the braking process, that is, the transmission brake assembly 100b is the main heat source in the braking device 100. As a specific solution, referring to Figures 3 and 5, the distance between the transmission brake assembly 100b and the flow channel 150c is smaller than the distance between the prime mover brake assembly 100a and the flow channel 150c.

[0188] That is, the second friction plate group 130 is closer to the flow channel 150c than the first friction plate group 110, and the oil entering through the flow channel 150c mainly lubricates the second friction plate group 130.

[0189] As a specific embodiment, referring to Figures 3 to 5, the second friction plate group 130 includes a first friction plate 131 and a second friction plate 132. Multiple first friction plates 131 are respectively anti-rotatingly connected to the brake seat 150 and are axially slidable relative to the brake seat 150; multiple second friction plates 132 are respectively anti-rotatingly connected to the drive shaft and are axially slidable relative to the prime mover shaft 211; the first friction plates 131 and the second friction plates 132 are configured to brake the prime mover shaft 211 through frictional force.

[0190] For example, the first friction plate 131 and the brake seat 150 are splined. Specifically, the second base 152 is provided with a spline groove 152d that mates with the first friction plate 131. The second friction plate 132 achieves anti-rotation engagement with the drive shaft through a synchronizing member 135, which can be a spline sleeve.

[0191] Optionally, the first friction plate 131 is a steel plate, and the material of the first friction plate 131 includes at least one of asbestos material, NAO friction material (Non-Asbestos Organic brake pad), semi-metallic material, ceramic material, powder metallurgy friction material (sintered friction material), carbon fiber friction material, etc.

[0192] The second friction plate assembly 130 further includes a guide pin 133 and a reset member 134. Multiple first friction plates 131 are connected in series by the guide pin 133, one end of which is inserted into the outer casing 153, and the other end into the second base 152. The guide pin 133 guides the sliding of the first friction plates 131. The reset member 134 is disposed between adjacent first friction plates 131. The reset member 134 allows the first friction plates 131 and second friction plates 132 to be separated when the second pressure on the second friction plate assembly 130 is released.

[0193] For example, the reset member 134 is a compression spring, which is sleeved on the guide pin 133.

[0194] The structure of the first friction plate group 110 is similar to that of the second friction plate group 130, and will not be described in detail here.

[0195] This application exemplarily describes the operation of the braking device 100:

[0196] When service braking is required, hydraulic oil enters from the second fluid exchange joint 162 and flows into the transmission piston chamber 140a along the second flow channel 152a. As the hydraulic pressure in the transmission piston chamber 140a continues to increase, the transmission braking piston 141 overcomes the elastic force of the transmission elastic element 142 and presses the second friction plate group 130. Since the second friction plate group 130 is connected to the first-stage transmission shaft 220, the second type of braking force acts on the first-stage transmission shaft 220, thereby realizing service braking.

[0197] When it is necessary to release the service brake, the hydraulic pressure in the transmission piston chamber 140a is released, and the transmission brake piston 141 moves towards the direction of the second friction plate group 130 under the action of the transmission elastic member 142. At this time, the reset member 134 separates the friction plates and releases the service brake.

[0198] When parking brake is required, the hydraulic oil in the prime mover piston chamber 120a is discharged along the first flow channel 151a and the first fluid exchange connector 161. Under the action of the prime mover elastic element 122, the prime mover brake piston 121 will press the first friction plate group 110. Since the first friction plate group 110 is connected to the prime mover shaft 211, the first type of braking force is applied to the prime mover shaft 211 to realize parking brake.

[0199] When the parking brake needs to be released, hydraulic oil enters the prime mover piston chamber 120a from the first fluid exchange joint 161 and the first flow channel 151a. After the prime mover piston chamber 120a is subjected to hydraulic pressure, it pushes the prime mover brake piston 121 to move in the direction of compressing the prime mover elastic element 122. As the hydraulic oil continues to enter, the first pressure given by the prime mover elastic element 122 is released. At this time, the friction plates in the first friction plate group 110 separate, and the parking brake is released.

[0200] According to a second aspect of this application, referring to Figures 1 and 2, a drive axle 10 is provided, which includes the aforementioned braking device 100. This drive axle 10 possesses all the beneficial effects of the aforementioned braking device 100, which will not be elaborated further herein.

[0201] In some embodiments, referring to Figures 1 to 3, the drive axle 10 further includes a prime mover shaft 211 and a drive shaft. The prime mover shaft 211 is configured to rotate under the drive of a prime mover 210, and the drive shaft and the prime mover shaft 211 form a transmission coupling.

[0202] 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 the same rotational speed as the prime mover shaft 211. For example, the primary transmission shaft 220 is connected to the prime mover shaft 211 through a differential 230. The secondary transmission shaft 251 undergoes at least one reduction gear relative to the primary transmission shaft 220.

[0203] In some embodiments, referring to Figures 1 to 3, the prime mover 210 is disposed between two transmission braking assemblies 100b. By distributing transmission braking assemblies 100b on both sides of the prime mover 210, the effectiveness of the service braking is ensured.

[0204] In some embodiments, referring to Figures 1 to 3, the prime mover 210 is disposed between the prime mover braking assembly 100a and the transmission braking assembly 100b.

[0205] For example, a prime mover brake assembly 100a and a transmission brake assembly 100b are provided on one side of the prime mover 210, while only another transmission brake assembly 100b is provided on the other side of the prime mover 210. Parking braking is achieved by the cooperation of the prime mover brake assembly 100a with the prime mover shaft 211, and braking is achieved by the cooperation of the transmission brake assemblies 100b provided on both sides of the prime mover 210. This arrangement can save one set of prime mover brake assembly 100a, while improving the heat dissipation efficiency of the transmission brake assembly 100b.

[0206] In some embodiments, referring to Figures 1 to 3, the prime mover 211 is configured as a motor output shaft, and the prime mover 211 has a shaft hole 211a that extends through the shaft along the axial direction.

[0207] The drive axle 10 also includes a differential 230 and an intermediate shaft 241.

[0208] The differential 230 is located between the prime mover 210 and the transmission brake assembly 100b, and is used to transmit the power of the prime mover 211 to the two drive shafts; the intermediate shaft 241 is rotatably inserted through the shaft hole 211a to form a transmission connection with the differential 230 and one of the drive shafts respectively.

[0209] Specifically, the differential 230 includes: a differential housing 231, a first planetary gear 232, and an output gear 233.

[0210] The differential housing 231 is anti-rotatingly connected to the prime mover shaft 211 and rotates synchronously with the prime mover shaft 211. The first planetary gear 232 is rotatably connected to the differential housing 231; there are two output gears 233, which mesh with the first planetary gear 232 respectively. One output gear 233 is anti-rotatingly connected to the first stage transmission shaft 220 located on one side of the prime mover 210, and the other output gear 233 is anti-rotatingly connected to the intermediate shaft 241. The intermediate shaft 241 passes through the shaft hole 211a and is anti-rotatingly connected to the first stage transmission shaft 220 located on the other side of the prime mover 210.

[0211] As a specific solution, referring to Figures 3 and 4, the intermediate shaft 241 and the primary drive shaft 220 are connected to prevent rotation through a connector 242. The connector 242 can be a spline sleeve, a coupling, or the like.

[0212] The connecting member 242 is located in the same axial position as at least one of the prime mover brake piston 121, the transmission brake piston 141, the first base 151, and the second base 152, while the first friction plate group 110 and the second friction plate group 130 are located on both sides of the connecting member 242, respectively. This arrangement makes full use of the axial space occupied by the connecting member 242 and improves the structural compactness.

[0213] In some embodiments, referring to Figures 1 to 3, the drive axle 10 further includes a reduction mechanism 250. The reduction mechanism 250 includes a secondary drive shaft 251, a reduction housing 252, a sun gear 254, a second planetary gear 255, and a planet carrier 256.

[0214] The primary drive shaft 220 has or is connected to a primary drive gear 221; the secondary drive shaft 251 has a secondary driven gear 251a that meshes with the primary drive gear 221. A reduction housing 252 is fixedly connected to the brake seat 150, and a reduction chamber 252a is formed inside it. The sun gear 254, the second planetary gear 255, and at least part of the planet carrier 256 are all located in the reduction chamber 252. The inner wall of the reduction housing 252 has a gear ring 253. The sun gear 254 is interference-fitted or splined with the secondary drive shaft 251 to achieve an anti-rotation fit. Power is transmitted to the sun gear 254 after being reduced by the primary drive gear 221 and the primary driven gear, thus causing the sun gear 254 to rotate synchronously with the secondary drive shaft 251. Multiple second planetary gears 255 are provided, spaced apart on the circumference of the sun gear 254 and meshing with both the sun gear 254 and the gear ring 253. The planetary gear 255 is rotatably connected to the planet carrier 256 via the planetary shaft 257. Power is output from the planet carrier 256, which is used to connect to the wheel, thereby driving the wheel transmission.

[0215] According to a third aspect of this application, a vehicle is provided that includes the aforementioned drive axle 10, and the vehicle possesses all the beneficial effects of the aforementioned drive axle 10, which will not be elaborated further herein. The vehicle can be a forklift, and this application can satisfy the forklift's requirements for driving braking force and parking braking force.

[0216] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of 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, "multiple" means two or more, unless otherwise explicitly specified.

[0217] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0218] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0219] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A braking device, characterized in that, include: A prime mover braking assembly is used to provide a first-class braking force to a prime mover axle in a vehicle; A drive-braking assembly for providing a second type of braking force to a driveshaft in a vehicle; wherein the prime mover braking assembly is connected to the prime mover shaft, and the drive-braking assembly is connected to the driveshaft; the prime mover braking assembly includes: a first friction pad assembly configured to generate a first type of braking force under pressure; and a prime mover braking piston for releasing or providing a first pressure to the first friction pad assembly; wherein the first friction pad assembly is coupled to the prime mover shaft; the drive-braking assembly includes: a second friction pad assembly configured to generate a second type of braking force under pressure; and a drive-braking piston for releasing or providing a second pressure to the second friction pad assembly; wherein the second friction pad assembly... The rubbing pad assembly is connected to the drive shaft; the prime mover brake piston and the transmission brake piston slide axially along the same central axis; the braking device further includes: a brake seat having an internal space; wherein the prime mover brake assembly and / or the transmission brake assembly are disposed in the internal space; the brake seat further includes: a first base, the prime mover brake piston being slidably connected to the first base; a second base, the transmission brake piston being slidably connected to the second base; and an outer shell forming the internal space; the first base and the second base are respectively located in the internal space, and the first base and the second base are respectively independently fixed to the outer shell.

2. The braking device according to claim 1, characterized in that, The prime mover braking assembly further includes: a prime mover elastic element for providing or releasing the first pressure; wherein the prime mover elastic element is coupled to the prime mover braking piston.

3. The braking device according to claim 1, characterized in that, The braking device further includes: a brake seat, wherein the prime mover brake piston is slidably connected to the brake seat; wherein a prime mover piston cavity is formed between the prime mover brake piston and the brake seat, and the prime mover brake piston slides relative to the brake seat when the prime mover piston cavity is filled with or drained with oil.

4. The braking device according to claim 3, characterized in that, The brake seat also has: a first flow channel for filling and / or draining the prime mover piston chamber; wherein, one end of the first flow channel is connected to the prime mover piston chamber and the other end is connected to an external pipeline.

5. The braking device according to claim 1, characterized in that, The transmission braking assembly further includes: a transmission elastic element for providing or releasing the second pressure; wherein the transmission elastic element is coupled to the transmission braking piston.

6. The braking device according to claim 1, characterized in that, The braking device further includes: a brake seat, wherein the transmission brake piston is slidably connected to the brake seat; wherein a transmission piston cavity is formed between the transmission brake piston and the brake seat, and the transmission brake piston slides relative to the brake seat when the transmission piston cavity is filled with or drained with oil.

7. The braking device according to claim 6, characterized in that, The brake seat also has a second flow channel for filling and / or draining the transmission piston chamber; wherein one end of the second flow channel is connected to the transmission piston chamber and the other end is connected to an external pipeline.

8. The braking device according to any one of claims 1 to 7, characterized in that, The prime mover braking assembly includes: a first friction pad group configured to generate a first type of braking force under pressure; and a prime mover braking piston for releasing or providing a first pressure to the first friction pad group; the transmission braking assembly includes: a second friction pad group configured to generate a second type of braking force under pressure; and a transmission braking piston for providing or releasing a second pressure to the second friction pad group; wherein the first pressure and the second pressure are in opposite directions.

9. The braking device according to claim 8, characterized in that, Both the prime mover brake piston and the transmission brake piston are located between the first friction plate group and the second friction plate group.

10. The braking device according to claim 9, characterized in that, At least a portion of the prime mover brake piston is located in the same axial position as at least a portion of the drive brake piston.

11. The braking device according to claim 9, characterized in that, The prime mover brake piston and / or the transmission brake piston are located between the first base and the second base.

12. The braking device according to claim 11, characterized in that, An active space is formed between the first base and the second base, and at least a portion of the prime mover piston is located inside the active space; The braking device further includes: a prime mover elastic element for biasing the prime mover brake piston; wherein the prime mover elastic element abuts between the prime mover brake piston and the second base.

13. The braking device according to claim 11, characterized in that, At least a portion of the first substrate is located in the same axial position as at least a portion of the second substrate.

14. The braking device according to claim 11, characterized in that, The second base is fixed to the outer shell by a plurality of bolts.

15. The braking device according to claim 11, characterized in that, The brake seat further includes a baffle plate, which is coupled to a predetermined axial position of the outer casing; wherein the first base is fixedly connected to the baffle plate.

16. The braking device according to any one of claims 1 to 7, characterized in that, The brake seat also has a flow channel for connecting the interior space of the seat with the outside, so that the external oil can exchange heat with the prime mover brake assembly and / or the transmission brake assembly in the interior space of the seat.

17. The braking device according to claim 16, characterized in that, The drive shaft is connected to a reduction mechanism, and the flow passage is connected to the reduction chamber of the reduction mechanism.

18. A drive axle, characterized in that, Includes the braking device as described in any one of claims 1 to 17.

19. The drive axle according to claim 18, characterized in that, The drive axle further includes: a prime mover shaft configured to rotate under the drive of a prime mover; and a transmission shaft that forms a transmission coupling with the prime mover shaft.

20. The drive axle according to claim 19, characterized in that, The prime mover is positioned between the two transmission and braking components.

21. The drive axle according to claim 20, characterized in that, The prime mover is positioned between the prime mover braking assembly and the transmission braking assembly.

22. The drive axle according to claim 20, characterized in that, The prime mover shaft is configured as a motor output shaft, and the prime mover shaft has a shaft hole that extends through the shaft along the axial direction; the drive axle further includes: a differential for transmitting the power of the prime mover shaft to the two drive shafts; an intermediate shaft rotatably passing through the shaft hole to form a transmission connection with the differential and one of the drive shafts respectively; wherein, the differential is located between the prime mover and the transmission braking assembly.

23. A vehicle, characterized in that, include: The drive axle according to any one of claims 18 to 22.

Images