Brake device, drive axle and vehicle

Abstract

The invention relates to a brake device, a drive axle and a vehicle, and the brake device comprises a prime brake assembly which is used for providing a first type of brake force for a prime shaft in the vehicle; the transmission braking assembly is used for providing a second type of braking force for a transmission shaft in the vehicle; wherein the prime brake assembly is connected to the prime shaft, and the transmission brake assembly is connected to the transmission shaft. The braking device, the drive axle and the vehicle have the beneficial effects that different braking forces are applied to the rim shaft and the transmission shaft of the vehicle so as to meet different braking requirements.

Description

Technical Field

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

[0002] Most of the current vehicle braking systems use a service brake + parking brake solution. In the prior art, the service brake and the parking brake are integrated and arranged on the same shaft, and different braking forces are applied to the same shaft. However, such a braking solution cannot adapt to different braking requirements well, and the braking performance is poor. Summary of the invention

[0003] The embodiment of the present application provides a braking device, which improves the braking performance of the braking device to at least partially solve the above-mentioned technical problems.

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

[0005] A prime mover brake assembly for providing a first type of braking force to a prime mover axle in a vehicle;

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

[0007] Wherein, 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 brake assembly comprises:

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

[0010] A prime mover brake piston, used for releasing or providing a first pressure to the first friction plate group;

[0011] Wherein, the first friction plate group is coupled to the driving shaft.

[0012] Optionally, the prime mover brake assembly further comprises:

[0013] A prime mover elastic member, used for providing or releasing the first pressure;

[0014] Wherein, the driving elastic member is coupled to the driving brake piston.

[0015] Optionally, the braking device further comprises:

[0016] A brake seat, wherein the prime mover brake piston is in sliding connection with the brake seat;

[0017] A driving piston cavity is formed between the driving brake piston and the brake seat, and the driving brake piston slides relative to the brake seat when the driving piston cavity is filled with oil or drained of oil.

[0018] Optionally, the brake seat further comprises:

[0019] A first flow channel, used for filling and / or draining the driving piston chamber with oil;

[0020] 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.

[0021] Optionally, the transmission brake assembly includes:

[0022] a second friction plate group configured to generate a second type of braking force under pressure;

[0023] A transmission brake piston, used for releasing or providing a second pressure to the second friction plate group;

[0024] Wherein, the second friction plate group is coupled to the transmission shaft.

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

[0026] A transmission elastic member, used for providing or releasing the second pressure;

[0027] Wherein, the transmission elastic member is coupled to the transmission brake piston.

[0028] Optionally, the braking device further comprises:

[0029] A brake seat, the transmission brake piston and the brake seat are in sliding connection;

[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 oil or drained of oil.

[0031] Optionally, the brake seat further comprises:

[0032] A second flow channel, used for filling and / or draining the transmission piston chamber with oil;

[0033] Wherein, one end of the second flow channel is connected to the transmission piston chamber, and the other end is connected to the external pipeline.

[0034] Optionally, the braking device comprises:

[0035] A brake seat having an inner seat space;

[0036] Wherein, the prime mover brake assembly and / or the transmission brake assembly are arranged in the space inside the seat.

[0037] Optionally, the prime mover brake assembly comprises:

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

[0039] A prime mover brake piston, used for releasing or providing a first pressure to the first friction plate group;

[0040] The transmission brake assembly comprises:

[0041] a second friction plate group configured to generate a second type of braking force under pressure;

[0042] a transmission brake piston, used for providing or releasing a second pressure to the second friction plate group;

[0043] The first pressure is in opposite directions to the second pressure.

[0044] Optionally, 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.

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

[0046] Optionally, 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.

[0047] Optionally, the brake seat comprises:

[0048] A first substrate, the active brake piston being in sliding connection with the first substrate;

[0049] a second base body, the transmission brake piston being in sliding connection with the second base body;

[0050] Wherein, the prime mover brake piston and / or the transmission brake piston is located between the first substrate and the second substrate.

[0051] Optionally, an activity space is formed between the first substrate and the second substrate, and at least part of the active brake piston is located inside the activity space;

[0052] The braking device also includes:

[0053] A prime mover elastic member, used for biasing the prime mover brake piston;

[0054] Wherein, the driving elastic member is in contact between the driving brake piston and the second base body.

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

[0056] Optionally, the brake seat further comprises:

[0057] An outer shell is formed with the seat inner space;

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

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

[0060] Optionally, the brake seat further comprises:

[0061] a baffle, coupled to a predetermined axial position of the outer shell;

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

[0063] Optionally, the brake seat further comprises:

[0064] The flow passage is used to connect the inner 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 inner space of the seat.

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

[0066] According to a second aspect of the present application, a drive axle is provided, comprising the above-mentioned braking device.

[0067] Optionally, the drive axle further includes:

[0068] a prime mover shaft configured to rotate when driven by a prime mover;

[0069] The transmission shaft forms a transmission coupling with the prime mover shaft.

[0070] Optionally, the prime mover is arranged between two of the transmission brake assemblies.

[0071] Optionally, the prime mover is arranged between the prime mover brake assembly and the transmission brake assembly.

[0072] Optionally, the driving shaft is configured as a motor output shaft, and the driving shaft has a shaft hole penetrating along the axial direction;

[0073] The drive axle further comprises:

[0074] A differential, used for transmitting the power of the prime mover shaft to the two transmission shafts;

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

[0076] Wherein, the differential is located between the prime mover and the transmission brake assembly.

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

[0078] The beneficial effect of the present application is that it provides a braking device, a drive axle and a vehicle that can satisfy different braking requirements by applying different braking forces on the prime mover shaft and the transmission shaft of the vehicle.

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

[0080] By providing the first type of braking force to the driving shaft in the vehicle, the stability of the vehicle can be maintained when the vehicle is stationary; and by providing the second type of braking force to the driving shaft in the vehicle, a quick response and effective deceleration or parking can be achieved. Through the above decentralized design, the two brake components can focus on their main functions, better adapt to different braking requirements, and improve braking performance.

[0081] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0083] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

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

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

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

[0087] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0088] Figure 5 yes Figure 3 A magnified schematic diagram of part B;

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

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

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

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

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

[0094] Fig.11 is a perspective view of the second substrate in the braking device provided in the exemplary embodiment of the present application from another perspective;

[0095] Fig.12 is a cross-sectional structural diagram of a second substrate in a brake device provided in an exemplary embodiment of the present application.

[0096] Description of reference numerals:

[0097] 100. Braking device;

[0098] 100a, prime mover brake assembly; 110, first friction plate group; 120a, prime mover piston chamber; 121, prime mover brake piston; 121a, first accommodating groove; 122, prime mover elastic member;

[0099] 100b, transmission brake assembly;

[0100] 130, second friction plate group; 131, first friction plate; 132, second friction plate; 133, guide pin; 134, reset member; 135, synchronization member;

[0101] 140a, transmission piston chamber; 141, transmission brake piston; 142, transmission elastic member; 143, support member; 143a, limiting boss;

[0102] 150, brake seat; 150a, seat inner space; 150b, activity space; 150c, flow passage;

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

[0104] 152, second base; 152a, second flow channel; 152b, second receiving groove; 152c, bolt hole; 152d, spline groove;

[0105] 153. outer shell; 154. baffle;

[0106] 161. First liquid exchange connector; 162. Second liquid exchange 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, primary transmission shaft; 221, primary driving gear;

[0112] 230, differential; 231, differential housing; 232, first planetary gear; 233, output gear;

[0113] 241, intermediate shaft; 242, connecting piece;

[0114] 250, speed reduction mechanism;

[0115] 251, secondary transmission shaft; 251a, secondary driven gear; 252, reduction housing; 252a, reduction chamber; 253, ring gear; 254, sun gear; 255, second planetary gear; 256, planet carrier; 257, planet shaft. DETAILED DESCRIPTION

[0116] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0117] According to the first aspect of the present application, referring to Figure 1 and Figure 2 The present application provides a braking device 100, comprising: a prime mover braking assembly 100a and a transmission braking assembly 100b.

[0118] The driving brake assembly 100a is used to provide a first type of braking force to a driving 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 driving brake assembly 100a is connected to the driving shaft 211, and the transmission brake assembly 100b is connected to the transmission shaft.

[0119] It should be noted that the prime mover shaft 211 may be a shaft directly driven by the prime mover 210. The transmission shaft may be a primary transmission shaft 220 or a secondary transmission shaft 251, wherein the primary transmission shaft 220 may be understood to have a rotation speed similar to or the same as that of the prime mover shaft 211, for example, the primary transmission shaft 220 is connected to the prime mover shaft 211 via a differential 230. The secondary transmission shaft 251 is at least one stage of reduction relative to the primary transmission shaft 220.

[0120] It can be understood that the driving brake assembly 100a can be used for driving brake or parking brake; the transmission brake assembly 100b can also be used for driving brake or parking brake. That is, according to different designs or actual working conditions, the functions of the driving brake assembly 100a and the transmission brake assembly 100b can be switched as required, and this is not limited.

[0121] Through the above technical solution, by providing the first type of braking force to the driving shaft 211 in the vehicle, the stability of the vehicle can be maintained when the vehicle is stationary; and by providing the transmission brake assembly 100a to provide the second type of braking force to the transmission shaft in the vehicle, a quick response and effective deceleration or parking can be achieved. Through the above decentralized design, the two brake assemblies can focus on their main functions, better adapt to different braking requirements, and improve braking performance.

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

[0123] At the same time, arranging the prime mover brake assembly 100a and the transmission brake assembly 100b on different shafts can reduce the failure of the entire brake device 100 due to a transmission shaft failure (such as a connection failure between the transmission shaft and the friction plate group, etc.), thereby improving the reliability of the brake system.

[0124] In some embodiments, reference Figure 3 and Figure 4 The dynamic brake assembly 100 a includes: a first friction plate group 110 and a dynamic brake piston 121 .

[0125] The first friction plate group 110 is coupled to the prime mover shaft 211 and is 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 group 110;

[0126] It can be understood that the first pressure can be provided by the prime mover brake piston 121 by applying pressure to the first friction plate group 110; alternatively, the first pressure is provided by other pressure components, such as a spring, and the prime mover brake piston 121 acts on the pressure component to relieve the first pressure on the first friction plate group 110.

[0127] In some embodiments, reference Figure 3 and Figure 4 The driving brake assembly 100a further includes a driving elastic member 122. The driving elastic member 122 is coupled to the driving brake piston 121 and is used to provide or release the first pressure. The cooperation between the driving elastic member 122 and the driving brake piston 121 realizes the provision and release of the first pressure.

[0128] Exemplarily, the driving elastic member 122 is a compression spring, and the driving elastic member 122 is arranged on the side of the driving brake piston 121 away from the first friction plate group 110 , and the first pressure is provided by the driving elastic member 122 , and the first pressure acts on the first friction plate group 110 through the driving brake piston 121 .

[0129] In some embodiments, reference Figure 3 , Figure 4 and Fig. 9 There are multiple prime mover elastic members 122, and the multiple prime mover elastic members 122 are arranged at intervals in the circumferential direction of the prime mover brake piston 121 to provide uniform elastic force to the prime mover brake piston 121 in the circumferential direction. Optionally, multiple groups of prime mover elastic members 122 can also be arranged in the radial direction of the prime mover brake piston 121 to further increase the magnitude of the elastic force. In this way, when the same elastic force is obtained, the length of the prime mover elastic member 122 can be reduced, thereby reducing the overall volume of the brake device 100.

[0130] In some embodiments, reference Figures 2 to 4 The braking device 100 also includes: a brake seat 150.

[0131] The prime mover brake piston 121 is slidably connected to the brake seat 150. A prime mover piston chamber 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 chamber 120a is filled with oil or drained with oil.

[0132] With such a solution, when the driving piston chamber 120a leaks oil, the driving brake piston 121 moves toward the first friction assembly under the first pressure of the driving elastic member 122. As the hydraulic oil is continuously released, the driving brake piston 121 presses the first friction assembly to generate a first type of braking force, thereby acting as a parking brake.

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

[0134] In some embodiments, reference Figure 1 , Figure 7 and Fig. 9 The brake seat 150 further has: 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, so as to realize oil filling and oil draining of the prime mover piston chamber 120a.

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

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

[0138] In some embodiments, reference Figure 3 , Figure 4 and Figure 6 The transmission brake assembly 100 b includes: a second friction plate group 130 and a transmission brake piston 141 .

[0139] The second friction plate group 130 is coupled to the transmission 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 group 130 .

[0140] It can be understood that the second pressure can be provided by the transmission brake piston 141 by applying pressure to the second friction plate group 130; alternatively, the second pressure is provided by other pressure components, such as a spring, and the transmission brake piston 141 acts on the pressure component to relieve the second pressure on the second friction plate group 130.

[0141] In some embodiments, reference Figure 3 , Figure 4 and Figure 6 The transmission brake assembly 100b further includes a transmission elastic member 142. The transmission elastic member 142 is coupled to the transmission brake piston 141 and is used to provide or release the second pressure. The second pressure is provided and released through the cooperation of the transmission elastic member 142 and the transmission brake piston 141.

[0142] Exemplarily, the transmission elastic member 142 is a compression spring, and the transmission elastic member 142 is disposed on a side of the transmission brake piston 141 close to the second friction plate group 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 group 130.

[0143] As a specific plan, refer to Figure 3 , Figure 4 and Figure 6 The braking device 100 further includes: a supporting 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 shape stability of the support member 143 is achieved.

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

[0146] In some embodiments, reference Figure 3 , Figure 4 , Figure 6 and Fig. 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.

[0147] In some embodiments, reference Figure 3 , Figure 4 and Figure 6 The transmission brake piston 141 is slidably connected to the brake seat 150. A transmission piston chamber 140a is formed between the transmission brake piston 141 and the brake seat 150. The transmission brake piston 141 slides relative to the brake seat 150 when the transmission piston chamber 140a is filled with oil or drained with oil.

[0148] It can be understood that the transmission brake assembly 100 b and the driving brake assembly 100 a share a brake seat 150 ; or, the transmission brake assembly 100 b and the driving brake assembly 100 a are respectively arranged on different brake seats 150 .

[0149] With this solution, when the transmission piston chamber 140a is filled with oil, the transmission brake piston 141 compresses the transmission elastic member 142 under the pressure of the hydraulic oil and presses the second friction plate group 130 to achieve a driving brake effect.

[0150] When the transmission piston chamber 140a leaks oil, 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 member 142, and finally the service brake is released.

[0151] In some embodiments, reference Figure 1 , Figure 8 and Fig.12 The brake seat 150 further has a second flow channel 152a.

[0152] One end of the second flow channel 152a is connected to the transmission piston chamber 140a, and the other end is connected to an external pipeline, so as to realize oil filling and / or oil draining of the transmission piston chamber 140a.

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

[0154] As a specific solution, refer to Figure 1 and Figure 8 The brake device 100 further includes: a second fluid exchange connector 162, which is fixedly connected to the brake seat 150 and is used to connect the second flow channel 152a with an external pipeline.

[0155] As a preferred solution, refer to Figure 1 and Figure 8 The brake device 100 further includes a ventilation connector 163. The ventilation connector 163 is connected to the transmission piston chamber 140a, and is used to at least exhaust the transmission piston chamber 140a.

[0156] In some embodiments, reference Figure 2 and Figure 3 The brake seat 150 has an inner seat space 150a; the prime mover brake assembly 100a and / or the transmission brake assembly 100b are disposed in the inner seat space 150a.

[0157] It is understood that the driving 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 both can be installed in different brake seats 150. That is, the installation method of the driving brake assembly 100a and the transmission brake assembly 100b can be selected according to actual needs.

[0158] As a preferred solution, refer to Figure 2 and Figure 3 The driving brake assembly 100a and the transmission brake assembly 100b are installed in the inner space 150a of the same brake seat 150, and the first pressure is in opposite directions to the second pressure.

[0159] It can be understood that the movement direction of the prime mover brake piston 121 when applying the first pressure to the first friction plate group 110 is opposite to the movement direction of the transmission brake piston 141 when applying the second pressure to the second friction plate group 130. In this way, based on the decentralized design of the two brake components, such a pressure direction is adopted to avoid mutual interference between the prime mover brake piston 121 and the transmission brake piston 141 when they move.

[0160] In some embodiments, reference Figure 2 and Figure 3 , the prime mover brake piston 121 and the transmission brake piston 141 are both located between the first friction plate group 110 and the second friction plate group 130. With such an arrangement, the space between the two first friction plate groups 110 and the second friction plate group 130 can be fully utilized, and the axial space occupied by the brake device 100 can be reduced.

[0161] In some embodiments, reference Figure 2 and Figure 3 , the driving brake piston 121 and the transmission brake piston 141 slide axially along the same central axis C1. That is, the axis of the driving shaft 211 connected to the driving brake assembly 100a coincides with the axis of the transmission shaft connected to the transmission brake assembly 100b. This solution is convenient for the installation of the brake device 100 and reduces the additional radial space occupied by the brake device 100.

[0162] In some embodiments, reference Figures 2 to 4 , at least part of the driving 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 driving brake piston 121 on the central axis C1 and the projection of the transmission brake piston 141 on the central axis C1 at least partially overlap.

[0163] By adopting such an arrangement, the axial space required for the whole of the driving brake piston 121 and the transmission brake piston 141 is reduced, and the structure is compact.

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

[0165] The driving brake piston 121 is slidably connected to the first substrate 151, and the first substrate 151 supports the driving brake piston 121, thereby improving the stability of the driving brake piston 121 when it moves. The transmission brake piston 141 is slidably connected to the second substrate 152, thereby improving the stability of the transmission brake piston 141 when it moves. There is a distance between the first substrate 151 and the second substrate 152. By setting the first substrate 151 and the second substrate 152, the driving brake piston 121 and the transmission brake piston 141 are supported respectively, thereby avoiding mutual interference, improving the heat dissipation effect, and reducing the difficulty of assembly.

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

[0167] Exemplarily, the active brake piston 121 is located between the first substrate 151 and the second substrate 152, and at least part of the active brake piston 121 can axially pass through the first substrate 151 to contact the first friction assembly. The active brake piston 121 is located on one side of the second substrate 152 close to the second friction plate group 130.

[0168] By adopting such a solution, the movements of the driving brake piston 121 and the transmission brake piston 141 are separated to avoid mutual interference, thereby improving the reliability of the brake device 100 and making the spatial arrangement of the brake device 100 more compact.

[0169] As a specific solution, refer to Figures 2 to 4 The driving piston chamber 120a is formed between the driving brake piston 121 and the first substrate 151, and the first substrate 151 forms a first flow channel 151a. The brake device 100 further includes a first sealing ring 164, and a plurality of first sealing rings 164 are arranged between the driving brake piston 121 and the first substrate 151 to seal the driving piston chamber 120a.

[0170] The transmission piston chamber 140a is formed between the transmission brake piston 141 and the second substrate 152. The second substrate 152 forms a second flow channel 152a. The brake device 100 further includes a second sealing ring 165. A plurality of second sealing rings 165 are disposed between the transmission brake piston 141 and the second substrate 152 to seal the transmission piston chamber 140a.

[0171] In some embodiments, reference Figure 3 and Figure 4The first substrate 151 and the second substrate 152 form an active space 150b, and at least part of the prime mover brake piston 121 is located in the active 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 substrate 152.

[0172] By adopting such a solution, the second base 152 is reused as the abutment reference of the prime mover elastic member 122 , which is beneficial to the assembly of the prime mover elastic member 122 while avoiding the addition of redundant spring seats, thereby making the structure compact.

[0173] As a specific plan, refer to Figure 3 , Figure 4 , Fig.10 and Fig.11 The prime mover brake piston has a first receiving groove 121a, and the second base 152 has a second receiving groove 152b, and the first receiving groove 121a and the second receiving groove 152b correspond to each other. 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 such a scheme, not only can the first accommodating groove 121a and the second accommodating groove 152b be used to constrain the prime mover elastic member 122, so that the prime mover elastic member 122 provides a stable elastic force in a direction parallel to the central axis C1, but also a portion of the prime mover elastic member 122 in the axial direction coincides with the prime mover brake piston 121 and the second base 152, thereby reducing the axial size of the braking device 100.

[0175] In some embodiments, reference Figure 3 and Figure 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 on the central axis C1 and the projection of the second substrate 152 on the central axis C1 at least partially overlap.

[0176] By adopting such an arrangement, the axial space required for the first substrate 151 and the second substrate 152 as a whole is reduced, and the structure is compact.

[0177] In some embodiments, reference Figure 2 and Figure 4 The brake seat 150 also includes: an outer shell 153.

[0178] The outer shell 153 is formed with a seat inner space 150a, the first base 151 and the second base 152 are respectively located in the seat inner space 150a, and the first base 151 and the second base 152 are respectively and independently fixed to the outer shell 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 plan, refer to Figure 3 , Fig.10 and Fig.11 The second base 152 is provided with a plurality of bolt holes 152c along the circumferential direction and is fixed to the outer shell 153 by a plurality of bolts. Compared with the method of using a retaining ring for limiting, the method of using bolts for fixing is convenient for installation and disassembly, and the positioning is more accurate.

[0180] As a specific plan, refer to Figure 3 and Figure 4 The brake seat 150 further includes a baffle 154. The baffle 154 is coupled to a predetermined axial position of the outer shell 153; specifically, one side of the baffle 154 abuts against the step structure on the inner wall of the outer shell 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 by bolts, which is convenient for installation and disassembly, and more accurate for positioning.

[0182] In some embodiments, reference Figure 3 and Figure 5 The brake seat 150 also has a flow passage 150c.

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

[0184] It can be understood that the flow channel 150c can exchange oil with the outside through an oil pipeline, or can be connected to an external chamber containing oil.

[0185] In this way, by providing the flow passage 150c, the temperature of at least one of the prime mover brake assembly 100a and the transmission brake assembly 100b is reduced, the heat dissipation effect is improved, and the braking performance is enhanced.

[0186] As a specific plan, refer to Figure 2 , Figure 3 and Figure 5The transmission shaft is connected to a speed reduction mechanism 250, and the flow passage 150c is connected to the speed reduction chamber 252a of the speed reduction mechanism 250. In this way, the lubricating oil in the speed reduction chamber 252a of the speed reduction mechanism 250 is used to cool the brake device 100, which can reduce the setting of additional oil pipelines.

[0187] Considering that the transmission brake assembly 100b is used for driving brake, 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 brake device 100. As a specific solution, refer to Figure 3 and Figure 5 , the distance between the transmission brake assembly 100b and the flow passage 150c is smaller than the distance between the driving brake assembly 100a and the flow passage 150c.

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

[0189] As a specific plan, refer to Figures 3 to 5 The second friction plate group 130 includes a first friction plate 131 and a second friction plate 132. The plurality of first friction plates 131 are respectively connected to the brake seat 150 and are axially slidable relative to the brake seat 150; the plurality of second friction plates 132 are respectively connected to the transmission shaft and are axially slidable relative to the driving shaft 211; the first friction plates 131 and the second friction plates 132 are configured to brake the driving shaft 211 by friction.

[0190] Exemplarily, the first friction plate 131 and the brake seat 150 are spline-matched. Specifically, the second base 152 is provided with a spline groove 152d that matches the first friction plate 131. The second friction plate 132 is anti-rotationally matched with the transmission shaft through a synchronous member 135, and the synchronous member 135 can adopt 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, asbestos-free 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 group 130 further includes: a guide pin 133 and a reset member 134. A plurality of first friction plates 131 are connected in series by the guide pin 133, one end of the guide pin 133 is inserted in the outer shell 153, and the other end is inserted in the second base 152. The guide pin 133 is provided to guide the sliding of the first friction plates 131. The reset member 134 is provided between adjacent first friction plates 131. By providing the reset member 134, when the second pressure on the second friction plate group 130 is released, the reset member can separate the first friction plates 131 from the second friction plates 132.

[0193] Exemplarily, the reset member 134 is a compression spring, and the reset member 134 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 herein.

[0195] This application describes the working process of the braking device 100 by way of example:

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

[0197] When the service brake needs to be released, the hydraulic pressure in the transmission piston chamber 140a is released, and the transmission brake piston 141 moves toward the second friction plate group 130 under the force 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 needed, the hydraulic oil in the driving piston chamber 120a is discharged along the first flow channel 151a and the first fluid exchange joint 161. Under the action of the driving elastic member 122, the driving brake piston 121 will press the first friction plate group 110. Since the first friction plate group 110 is connected to the driving shaft 211, the first type of braking force acts on the driving shaft 211 to achieve parking brake.

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

[0200] According to the second aspect of the present application, referring to Figure 1 and Figure 2 , a drive axle 10 is provided, and the drive axle 10 includes the above-mentioned braking device 100. The drive axle 10 has all the beneficial effects of the above-mentioned braking device 100, and the present application will not repeat them here.

[0201] In some embodiments, reference Figures 1 to 3 The drive axle 10 further includes 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 and the prime mover shaft 211 form a transmission coupling.

[0202] Specifically, the prime mover shaft 211 may be a shaft directly driven by the prime mover 210. The transmission shaft may be a primary transmission shaft 220 or a secondary transmission shaft 251, wherein the primary transmission shaft 220 may be understood to have a rotation speed similar to or the same as that of the prime mover shaft 211, for example, the primary transmission shaft 220 is connected to the prime mover shaft 211 via a differential 230. The secondary transmission shaft 251 is at least one stage of speed reduction relative to the primary transmission shaft 220.

[0203] In some embodiments, reference Figures 1 to 3 The prime mover 210 is arranged between the two transmission brake assemblies 100b. By arranging the transmission brake assemblies 100b on both sides of the prime mover 210, the effect of driving brake is ensured.

[0204] In some embodiments, reference Figures 1 to 3 The prime mover 210 is disposed between the prime mover brake assembly 100a and the transmission brake 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, and only another transmission brake assembly 100b is provided on the other side of the prime mover 210. Parking brake is realized by the cooperation of a prime mover brake assembly 100a and a prime mover shaft 211, and braking is realized by the cooperation of the transmission brake assemblies 100b respectively provided on both sides of the prime mover 210. With such an arrangement, one set of prime mover brake assemblies 100a can be saved, and the heat dissipation efficiency of the transmission brake assembly 100b can be improved.

[0206] In some embodiments, reference Figures 1 to 3 The driving shaft 211 is constructed as a motor output shaft, and has a shaft hole 211 a penetrating along the axial direction.

[0207] The drive axle 10 further 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 shaft 211 to the two transmission shafts; the intermediate shaft 241 is rotatably arranged in the shaft hole 211a to form a transmission connection with the differential 230 and one of the transmission shafts respectively.

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

[0210] The differential case 231 is fixedly connected to the prime mover shaft 211 and rotates synchronously with the prime mover shaft 211. The first planetary gear 232 is rotationally connected to the differential case 231; two output gears 233 are provided, and the two output gears 233 are respectively engaged with the first planetary gears 232, one of the output gears 233 is fixedly connected to the primary transmission shaft 220 located on one side of the prime mover 210, and the other output gear 233 is fixedly connected to the intermediate shaft 241, and the intermediate shaft 241 passes through the shaft hole 211a and is fixedly connected to the primary transmission shaft 220 located on the other side of the prime mover 210.

[0211] As a specific plan, refer to Figure 3 and Figure 4 The intermediate shaft 241 and the primary transmission shaft 220 are connected to each other in a non-rotating manner via a connecting piece 242 , and the connecting piece 242 may be a spline sleeve, a coupling, or the like.

[0212] The connecting member 242 is located at 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 respectively located on both sides of the connecting member 242. With such an arrangement, the axial space occupied by the connecting member 242 is fully utilized, thereby improving the compactness of the structure.

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

[0214] The primary transmission shaft 220 has or is connected to a primary driving gear 221; the secondary transmission shaft 251 has a secondary driven gear 251a meshed with the primary driving gear 221. The reduction housing 252 is fixedly connected to the brake seat 150, and a reduction chamber 252a is formed inside the reduction housing 252. The sun gear 254, the second planetary gear 255, and at least part of the planetary 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 and the secondary transmission shaft 251 are interference fit or spline fit to achieve a non-rotating 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. A plurality of second planetary gears 255 are provided, which are spaced and distributed on the circumference of the sun gear 254 and mesh with the sun gear 254 and the gear ring 253 at the same time. The planetary gear 255 is rotatably connected to the planetary carrier 256 via the planetary shaft 257 , and the power is output by the planetary carrier 256 . The planetary carrier 256 is used to be connected to the wheels, thereby driving the wheels to transmit power.

[0215] According to the third aspect of the present application, a vehicle is provided, the vehicle includes the above-mentioned drive axle 10, the vehicle has all the beneficial effects of the above-mentioned drive axle 10, and the present application will not repeat them here. The vehicle can be a forklift, and the present application can meet the requirements of the forklift 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 understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0217] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0218] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0219] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A braking device, characterized in that: include: A prime mover brake assembly for providing a first type of braking force to a prime mover axle in a vehicle; A transmission brake assembly for providing a second type of braking force to a transmission shaft in a 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.

2. The braking device according to claim 1, characterized in that: The prime mover brake assembly comprises: a first friction plate group configured to generate a first type of braking force under pressure; A prime mover brake piston, used for releasing or providing a first pressure to the first friction plate group; Wherein, the first friction plate group is coupled to the driving shaft.

3. The braking device according to claim 2, characterized in that: The prime mover brake assembly also includes: A prime mover elastic member, used for providing or releasing the first pressure; Wherein, the driving elastic member is coupled to the driving brake piston.

4. The braking device according to claim 2, characterized in that: The braking device also includes: A brake seat, wherein the prime mover brake piston is in sliding connection with the brake seat; A driving piston cavity is formed between the driving brake piston and the brake seat, and the driving brake piston slides relative to the brake seat when the driving piston cavity is filled with oil or drained of oil.

5. The braking device according to claim 4, characterized in that: The brake seat also has: A first flow channel, used for filling and / or draining the driving piston chamber with oil; 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.

6. The braking device according to claim 1, characterized in that: The transmission brake assembly comprises: a second friction plate group configured to generate a second type of braking force under pressure; A transmission brake piston, used for releasing or providing a second pressure to the second friction plate group; Wherein, the second friction plate group is coupled to the transmission shaft.

7. The braking device according to claim 6, characterized in that: The transmission brake assembly also includes: A transmission elastic member, used for providing or releasing the second pressure; Wherein, the transmission elastic member is coupled to the transmission brake piston.

8. The braking device according to claim 6, characterized in that: The braking device also includes: A brake seat, the transmission brake piston and the brake seat are in sliding connection; 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 oil or drained of oil.

9. The braking device according to claim 8, characterized in that: The brake seat also has: A second flow channel, used for filling and / or draining the transmission piston chamber with oil; Wherein, one end of the second flow channel is connected to the transmission piston chamber, and the other end is connected to the external pipeline.

10. The braking device according to any one of claims 1 to 9, characterized in that: The braking device comprises: A brake seat having an inner seat space; Wherein, the prime mover brake assembly and / or the transmission brake assembly are arranged in the space inside the seat.

11. The braking device according to claim 10, characterized in that: The prime mover brake assembly comprises: a first friction plate group configured to generate a first type of braking force under pressure; A prime mover brake piston, used for releasing or providing a first pressure to the first friction plate group; The transmission brake assembly comprises: a second friction plate group configured to generate a second type of braking force under pressure; a transmission brake piston, used for providing or releasing a second pressure to the second friction plate group; The first pressure is in opposite directions to the second pressure.

12. The braking device according to claim 11, characterized in that: 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.

13. The braking device according to claim 12, characterized in that: The prime mover brake piston and the transmission brake piston slide axially along the same central axis.

14. The braking device according to claim 13, characterized in that: At least a portion of the prime mover brake piston is located at the same axial position as at least a portion of the transmission brake piston.

15. The braking device according to claim 13, characterized in that: The brake seat comprises: A first substrate, the active brake piston being in sliding connection with the first substrate; a second base body, the transmission brake piston being in sliding connection with the second base body; Wherein, the prime mover brake piston and / or the transmission brake piston is located between the first substrate and the second substrate.

16. The braking device according to claim 15, characterized in that: An active space is formed between the first substrate and the second substrate, and at least a portion of the active brake piston is located inside the active space; The braking device also includes: A prime mover elastic member, used for biasing the prime mover brake piston; Wherein, the driving elastic member is in contact between the driving brake piston and the second base body.

17. The braking device according to claim 15, characterized in that: At least a portion of the first substrate and at least a portion of the second substrate are located at the same axial position.

18. The braking device according to claim 15, characterized in that: The brake seat also includes: An outer shell is formed with the seat inner space; The first substrate and the second substrate are respectively located in the seat inner space, and the first substrate and the second substrate are respectively and independently fixed to the outer shell.

19. The braking device according to claim 18, characterized in that: The second base body is fixed to the outer shell by a plurality of bolts.

20. The braking device according to claim 18, characterized in that: The brake seat also includes: a baffle, coupled to a predetermined axial position of the outer shell; Wherein, the first substrate is fixedly connected to the baffle.

21. The braking device according to claim 10, characterized in that: The brake seat also has: The flow passage is used to connect the inner 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 inner space of the seat.

22. The braking device according to claim 20, characterized in that: The transmission shaft is connected to a deceleration mechanism, and the flow passage is connected to a deceleration chamber of the deceleration mechanism.

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

24. The drive axle according to claim 23, characterized in that: The drive axle further comprises: a prime mover shaft configured to rotate when driven by a prime mover; The transmission shaft forms a transmission coupling with the prime mover shaft.

25. The drive axle according to claim 24, characterized in that: The prime mover is arranged between the two transmission brake assemblies.

26. The drive axle according to claim 24, characterized in that: The prime mover is arranged between the prime mover brake assembly and the transmission brake assembly.

27. The drive axle according to claim 24, characterized in that: The driving shaft is configured as a motor output shaft, and has a shaft hole penetrating in the axial direction; The drive axle further comprises: A differential, used for transmitting the power of the prime mover shaft to the two transmission shafts; An intermediate shaft is rotatably arranged in the shaft hole to form a transmission connection with the differential and one of the transmission shafts respectively; Wherein, the differential is located between the prime mover and the transmission brake assembly.

28. A vehicle, characterized in that: include: A drive axle as claimed in any one of claims 23 to 27.

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