Brake device, drive axle and vehicle

Abstract

The invention relates to a brake device, a drive axle and a vehicle. The brake device comprises a brake seat and a brake assembly, the service brake piston is used for providing or relieving service brake pressure for a transmission shaft in a vehicle; the parking brake piston is used for providing or releasing parking brake pressure for a transmission shaft in a vehicle; the parking brake piston and the service brake piston form transmission coupling so that service brake pressure provided by the service brake piston and / or parking brake pressure provided by the parking brake piston can act on a transmission shaft in a vehicle in an acting force transmission mode. The brake device, the drive axle and the vehicle have the beneficial effects that transmission coupling is formed through the service brake piston and the parking brake piston, so that the assembly flexibility is improved.

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 adopt a service brake + parking brake solution. In the prior art, braking and parking are achieved by applying pressure to the drive shaft by a service brake piston or a parking brake piston, respectively. This requires sufficient layout space for the service brake piston or the parking brake piston in the radial direction of the drive shaft.

[0003] In some scenarios where space is limited (e.g., limited radial installation space), the solution of the service brake piston and the parking brake piston applying pressure to the drive shaft separately has limitations, is prone to interference with other components, and has poor assembly flexibility. Summary of the invention

[0004] The embodiment of the present application provides a braking device, which improves the assembly flexibility of the braking device, so as to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above object, according to a first aspect of the present application, a braking device is provided, comprising:

[0006] Brake seat;

[0007] A service brake piston, used to apply or release service brake pressure to a drive shaft in a vehicle;

[0008] A parking brake piston for applying or releasing parking brake pressure to a drive shaft in a vehicle;

[0009] The parking brake piston and the service brake piston form a transmission coupling so that the service brake pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston acts on a transmission shaft in a vehicle in a force transmission manner.

[0010] Optionally, the service brake pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston acts on a secondary transmission shaft in a vehicle.

[0011] Optionally, the service brake piston slides axially along the first axis to provide or release service brake pressure to a friction plate group;

[0012] The parking brake piston slides axially along the second axis to provide or release parking brake pressure to the service brake piston;

[0013] Wherein, the first axis is arranged on one side of the second axis; and the service brake piston is located between the parking brake piston and the friction plate group.

[0014] Optionally, a service piston cavity is formed between the service brake piston and the brake seat, and the service brake piston slides relative to the brake seat when the service piston cavity is filled with oil or drained of oil;

[0015] A parking piston cavity is formed between the parking brake piston and the brake seat, and the parking brake piston slides relative to the brake seat when the parking piston cavity is filled with oil or drained of oil.

[0016] Optionally, the first axis and the second axis are parallel to each other.

[0017] Optionally, the braking device further comprises:

[0018] A parking elastic member, used for releasing or providing the parking brake pressure;

[0019] Wherein, one end of the parking elastic member abuts against the parking brake piston, and the other end abuts against the brake seat.

[0020] Optionally, the parking brake piston has a first accommodating groove, the brake seat has a second accommodating groove, one end of the parking elastic member extends into the first accommodating groove, and the other end of the parking elastic member extends into the second accommodating groove.

[0021] Optionally, the braking device further comprises:

[0022] A transmission member, at least partially disposed between the parking brake piston and the service brake piston to constitute the transmission of the parking brake pressure;

[0023] The conductive member is slidably disposed inside the brake seat, one end of the conductive member abuts against the parking brake piston, and at least a portion of the other end of the conductive member abuts against the service brake piston.

[0024] Optionally, the conductive member has:

[0025] A main body portion, arranged around the second axis;

[0026] an eccentric portion, at least a portion of which abuts against the service brake piston;

[0027] The first axis passes through a projection contour of the eccentric portion in the axial direction of the first axis.

[0028] Optionally, the brake seat is formed with

[0029] a first guide groove, in which at least a portion of the service brake piston is located;

[0030] a second guide groove, wherein at least a portion of the conductive member is located in the second guide groove;

[0031] Wherein, the first guide groove is communicated with the second guide groove.

[0032] Optionally, the braking device further comprises:

[0033] A return elastic member is provided extending along the axial direction of the second axis;

[0034] Wherein, one end of the return elastic member abuts against the brake seat, and the other end abuts against the conductive member.

[0035] Optionally, the brake seat has a third accommodating groove, the conductive member has a fourth accommodating groove, one end of the return elastic member extends into the third accommodating groove, and the other end of the return elastic member extends into the fourth accommodating groove.

[0036] Optionally, the brake seat has or is connected with:

[0037] A guide body having a guide through hole extending axially along the second axis;

[0038] Wherein, at least part of the conductive member can be slidably disposed in the guide through hole;

[0039] The conductive member further forms a limiting flange, and a projection of the limiting flange in the axial direction of the second axis at least partially overlaps with a projection of the guide body in the axial direction of the second axis.

[0040] Optionally, the braking device further comprises:

[0041] A driving elastic member, used to release or provide the driving brake pressure;

[0042] Wherein, one end of the driving elastic member abuts against the driving brake piston, and the other end is combined with the brake seat.

[0043] Optionally, the braking device further comprises:

[0044] A support member, forming a limited boss to abut against the travel elastic member;

[0045] Wherein, the driving elastic member is sleeved on the support member, and one end of the support member away from the limiting boss is fixedly connected to the brake seat.

[0046] Optionally, the brake seat comprises:

[0047] A service brake housing, wherein the service brake piston is disposed inside the service brake housing;

[0048] A parking brake housing, wherein the parking brake piston is disposed inside the parking brake housing;

[0049] Wherein, the parking brake housing is detachably connected to the service brake housing; the service brake housing has a service oil port, which is communicated with the service piston chamber; the parking brake housing has a parking oil port, which is communicated with the parking piston chamber.

[0050] Optionally, the service brake housing has:

[0051] A first mounting portion, used for fixing to an external device;

[0052] a second mounting portion, at least used to fix the parking brake housing;

[0053] In the axial direction of the second axis, the first mounting portion and the second mounting portion are located at different positions, the second mounting portion is formed with a clearance gap, and the side wall of the clearance gap is arranged around the second axis.

[0054] According to a second aspect of the present application, a drive axle is provided, comprising the braking device as described above.

[0055] Optionally, the drive axle further includes:

[0056] A primary transmission shaft having or connected to a primary driving gear;

[0057] a secondary transmission shaft having a primary driven gear meshing with the primary driving gear;

[0058] A friction plate group, comprising a first friction plate and a second friction plate;

[0059] Wherein, the first friction plate is connected to the brake seat for preventing rotation, and the second friction plate is connected to the secondary transmission shaft for preventing rotation; the first friction plate and the second friction plate are configured to brake the secondary transmission shaft by friction force.

[0060] Optionally, the primary transmission shaft, the secondary transmission shaft, the friction plate group and the brake seat are provided in pairs respectively, and the two primary transmission shafts are respectively connected to a differential;

[0061] The drive axle further comprises:

[0062] A driving device, used for outputting a driving torque to the differential;

[0063] Wherein, the two brake seats, the secondary transmission shaft and the friction plate group are symmetrically arranged relative to the driving device.

[0064] According to a third aspect of the present application, a vehicle is also provided, comprising the drive axle as described above.

[0065] The beneficial effect of the present application is that it provides a brake device, a drive axle and a vehicle which improve assembly flexibility by forming a transmission coupling through a service brake piston and a parking brake piston.

[0066] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0067] A transmission coupling is formed by the parking brake piston and the service brake piston, so that the service brake pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston acts on a drive shaft in a vehicle in a force transmission manner, so that the positions of the service brake piston and the parking brake piston in the radial or axial direction of the drive shaft can be staggered to avoid other components in the radial or axial direction of the drive shaft, avoid interference, and improve assembly flexibility.

[0068] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] 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.

[0070] 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.

[0071] Figure 1 is a schematic diagram of the overall structure of a drive axle provided in an exemplary embodiment of the present application;

[0072] Figure 2 is an internal cross-sectional view of a drive axle provided in an exemplary embodiment of the present application;

[0073] Figure 3 is an internal cross-sectional view of a portion of a drive axle provided in an exemplary embodiment of the present application;

[0074] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0075] Figure 5 yes Figure 3 A magnified schematic diagram of part B;

[0076] Figure 6 yes Figure 3 A magnified schematic diagram of part C;

[0077] Figure 7 is an internal cross-sectional view of another portion of a drive axle provided in an exemplary embodiment of the present application;

[0078] Figure 8 An exploded view of a portion of a drive axle provided in an exemplary embodiment of the present application

[0079] Fig. 9 is a perspective view of a parking brake housing in a drive axle provided in an exemplary embodiment of the present application;

[0080] Fig.10 is a perspective view of a transmission member in a drive axle provided in an exemplary embodiment of the present application;

[0081] Fig.11 is a perspective view of a service brake housing in a drive axle provided in an exemplary embodiment of the present application;

[0082] Fig.12 is a front view of a drive axle provided in an exemplary embodiment of the present application.

[0083] Description of reference numerals:

[0084] 100. Braking device;

[0085] 100a, driving piston chamber; 100b, parking piston chamber;

[0086] 110, brake seat; 110a, seat inner space; 110b, second receiving groove; 110c, first guide groove; 110d, second guide groove; 110e, third receiving groove;

[0087] 111, service brake housing; 111a, service oil port; 111b, first mounting portion; 111c, second mounting portion; 111d, clearance notch;

[0088] 112, parking brake housing; 112a, parking oil port;

[0089] 120, service brake piston; 130, parking brake piston; 130a, first accommodation groove;

[0090] 141. parking elastic member; 142. return elastic member;

[0091] 150, conductive member; 151, main body; 152, eccentric portion; 150a, fourth accommodating groove; 153, limiting flange;

[0092] 160, guide body; 160a, guide through hole;

[0093] 171, driving elastic member; 172, supporting member; 172a, limiting boss;

[0094] 181, first sealing ring; 182, second sealing ring;

[0095] C1, first axis; C2, second axis;

[0096] 10. Drive axle;

[0097] 210, primary transmission shaft; 211, primary driving gear; 220, secondary transmission shaft; 221, primary driven gear;

[0098] 230, friction plate group; 231, first friction plate; 232, second friction plate;

[0099] 241, differential; 242, intermediate transmission shaft; 250, drive device; 251, motor shaft;

[0100] 260. Two-stage reduction mechanism; 261. Reduction housing; 262. Sun gear; 263. Planetary gear; 264. Planetary carrier. DETAILED DESCRIPTION

[0101] 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.

[0102] According to the first aspect of the present application, referring to Figures 2 to 4 The present application provides a braking device 100 , including: a brake seat 110 , a service brake piston 120 and a parking brake piston 130 .

[0103] The brake seat 110 has an inner seat space 110 a , and at least a portion of the service brake piston 120 and the parking brake piston 130 are respectively installed in the inner seat space 110 a .

[0104] The service brake piston 120 is used to provide or release service brake pressure to a drive shaft in a vehicle; it is understood that the service brake pressure can be provided by the service brake piston 120 directly to a drive shaft in a vehicle to achieve braking; or, the service brake piston 120 is used to release the service brake pressure.

[0105] The parking brake piston 130 is used to provide or release parking brake pressure to a transmission shaft in a vehicle; the parking brake pressure can be provided by the parking brake piston 130 directly to a transmission shaft in a vehicle to achieve parking; or, the parking brake pressure is provided by other pressure components, such as springs, which apply thrust to the transmission shaft through the spring, and the parking brake piston 130 acts on the pressure component to release the parking brake pressure on the transmission shaft. The working mode of the parking brake piston 130 can be determined according to actual product design requirements.

[0106] The parking brake piston 130 and the service brake piston 120 form a transmission coupling, so that the service brake pressure provided by the service brake piston 120 and the parking brake pressure provided by the parking brake piston 130 act on a transmission shaft in a vehicle in a force transmission manner.

[0107] It should be noted that the transmission shaft can be a primary transmission shaft 210 or a secondary transmission shaft 220, wherein the primary transmission shaft 210 can be understood as having the same rotation speed as the output shaft of the driving device 250, and the secondary transmission shaft 220 undergoes at least one stage of reduction relative to the primary transmission shaft 210.

[0108] Exemplarily, the parking brake pressure provided by the parking brake piston 130 is transmitted to the transmission shaft through the service brake piston 120 ; or, the service brake pressure provided by the service brake piston 120 is transmitted to the transmission shaft through the parking brake piston 130 .

[0109] Through the above technical solution, a transmission coupling is formed by the parking brake piston 130 and the service brake piston 120, so that the service brake pressure provided by the service brake piston 120 and / or the parking brake pressure provided by the parking brake piston 130 acts on a drive shaft in a vehicle in a force transmission manner, so that the positions of the service brake piston 120 and the parking brake piston 130 in the radial or axial direction of the drive shaft can be staggered, avoiding other components in the radial or axial direction of the drive shaft, such as a reduction housing, a differential, etc., to avoid interference and improve assembly flexibility.

[0110] In some embodiments, reference Figures 2 to 4 The service brake pressure provided by the service brake piston 120 and / or the parking brake pressure provided by the parking brake piston 130 act on a secondary transmission shaft 220 in a vehicle.

[0111] It can be understood that at least one of the service brake pressure provided by the service brake piston 120 and the parking brake pressure provided by the parking brake piston 130 acts on the secondary transmission shaft 220 .

[0112] Adopting such a solution can help reduce energy consumption, improve transmission efficiency, and reduce the temperature rise caused by braking.

[0113] In some embodiments, reference Figures 2 to 4 The service brake piston 120 can slide axially along a first axis C1 to provide or release service brake pressure to a friction plate group 230. The parking brake piston 130 can slide axially along a second axis C2 to provide or release parking brake pressure to the service brake piston 120. The first axis C1 is arranged on one side of the second axis C2, that is, the first axis C1 and the second axis C2 can be arranged parallel or inclined; the service brake piston 120 is located between the parking brake piston 130 and the friction plate group 230.

[0114] It can be understood that the service brake pressure can be provided by the service brake piston 120 directly pressing the friction plate group 230, so that the friction plate group 230 generates friction to achieve braking; or, the service brake piston 120 moves away from the friction plate group 230 to release the service brake pressure.

[0115] The parking brake pressure can be provided by the parking brake piston 130 pushing the service brake piston 120, and then the service brake piston 120 compressing the friction plate group 230; or, the parking brake pressure is provided by other pressure components, such as springs, which apply thrust to the service brake piston 120 to compress the friction plate group 230, and the parking brake piston 130 acts on the pressure component or the service brake piston 120 to release its thrust on the service brake piston 120. The working mode of the parking brake piston 130 can be determined according to the actual product design requirements.

[0116] In some embodiments, reference Figures 2 to 5 A service piston chamber 100a is formed between the service brake piston 120 and the brake seat, and the service brake piston 120 slides relative to the brake seat when the service piston chamber 100a is filled with oil or drained with oil; a parking piston chamber 100b is formed between the parking brake piston 130 and the brake seat, and the parking brake piston 130 slides relative to the brake seat when the parking piston chamber 100b is filled with oil or drained with oil.

[0117] For example, when the service piston chamber 100a is filled with oil, the service brake piston 120 moves toward the friction plate group 230 under the pressure of the hydraulic oil in the service piston chamber 100a, thereby pressing the friction plate group 230. When the service piston chamber 100a is drained of oil, the service brake piston 120 at least moves away from the friction plate group 230 under the pressure of the hydraulic oil.

[0118] When the parking piston chamber 100b is filled with oil, the parking brake piston 130 moves in a direction away from the service brake piston 120 under the pressure of the hydraulic oil in the parking piston chamber 100b. When the parking piston chamber 100b is drained of oil, the parking brake piston 130 moves in a direction close to the service brake piston 120 at least under the pressure of the hydraulic oil in the parking piston chamber 100b.

[0119] Through the above technical solution, the service brake piston 120 can slide axially along a first axis C1, and the parking brake piston 130 can slide axially along a second axis C2, and the first axis C1 is arranged on one side of the second axis C2, so that the radial positions of the service brake piston 120 and the parking brake piston 130 are staggered. Through this staggered arrangement, the parking brake piston 130 can avoid other components in the radial or axial direction of the first axis C1, that is, the part of the brake seat 110 corresponding to the parking brake piston 130 is offset in the direction close to the second axis C2 to avoid interference and improve assembly flexibility.

[0120] In some embodiments, reference Figure 3 , the first axis C1 and the second axis C2 are parallel to each other. In this way, the compactness of the spatial arrangement of the service brake piston 120 and the parking brake piston 130 can be improved. At the same time, the direction of the force applied by the parking brake piston 130 to the service brake piston 120 is the same as the sliding direction of the service brake piston 120, thereby reducing the force loss.

[0121] In some embodiments, reference Figure 3 , Figure 4 , Figure 7 and Figure 8 The braking device 100 further includes: a parking elastic member 141 .

[0122] The parking elastic member 141 is used to release or provide parking brake pressure; wherein one end of the parking elastic member 141 abuts against the parking brake piston 130 , and the other end abuts against the brake seat 110 .

[0123] Exemplarily, the parking elastic member 141 is a compression spring, and the parking elastic member 141 is disposed on a side of the parking brake piston 130 away from the service brake piston 120 , and the parking brake pressure is provided by the parking elastic member 141 .

[0124] By adopting such a scheme, through the setting of the parking elastic member 141, when the parking piston chamber 100b leaks oil, the parking brake piston 130 moves toward the service brake piston 120 under the elastic action of the parking elastic member 141. With the continuous release of hydraulic oil, the transmission member 150 eventually presses against the service brake piston 120 to press the friction plate group 230, thereby playing the role of parking brake.

[0125] When the parking piston chamber 100b is filled with oil, the parking brake piston 130 moves away from the service brake piston 120 under the pressure of the hydraulic oil. As the parking elastic member 141 is continuously compressed, the pressure of the parking brake piston 130 on the service brake piston 120 continues to decrease, and finally the parking is released.

[0126] In some embodiments, reference Figure 7 and Figure 8 A plurality of parking elastic members 141 are provided, and the plurality of parking elastic members 141 are spaced apart in the circumferential direction of the second axis C2 to provide a uniform elastic force to the parking brake piston 130 in the circumferential direction. More specifically, a plurality of groups of parking elastic members 141 are also provided in the radial direction of the second axis C2 to further increase the magnitude of the elastic force. In this way, when the same elastic force is obtained, the length of the parking elastic member 141 can be reduced, thereby reducing the overall volume of the braking device 100.

[0127] In some embodiments, reference Figure 3 , Figure 4 and Figure 7 The parking brake piston 130 has a first receiving groove 130a, and the brake seat 110 has a second receiving groove 110b, and the first receiving groove 130a and the second receiving groove 110b correspond to each other. One end of the parking elastic member 141 extends into the first receiving groove 130a, and the other end of the parking elastic member 141 extends into the second receiving groove 110b.

[0128] By adopting such a scheme, not only can the first accommodating groove 130a and the second accommodating groove 110b be used to constrain the parking elastic member 141, so that the parking elastic member 141 provides a stable elastic force in a direction parallel to the second axis C2, but also a portion of the length of the parking elastic member 141 coincides with the parking brake piston 130 and the brake seat 110 in the axial direction of the second axis C2, thereby reducing the required axial size of the brake seat 110.

[0129] In some embodiments, reference Figures 3 to 5 , Figure 7 and Figure 8 The braking device 100 further includes: a conductive member 150 .

[0130] At least part of the transmission member 150 is disposed between the parking brake piston 130 and the service brake piston 120 to transmit the parking brake pressure. The transmission member 150 is slidably disposed inside the brake seat 110, one end of the transmission member 150 abuts against the parking brake piston 130, and at least part of the other end of the transmission member 150 abuts against the service brake piston 120.

[0131] With such a solution, since the service brake piston 120 and the parking brake piston 130 are staggered in radial direction, the transmission member 150 can be provided to form a stable pressure transmission between the service brake piston 120 and the parking brake piston 130 .

[0132] In some embodiments, reference Figure 4 , Figures 7 to 10 The conductive member 150 includes a main body portion 151 and an eccentric portion 152 .

[0133] The main body 151 is arranged around the second axis C2 and abuts against the parking brake piston 130 ; at least part of the eccentric portion 152 abuts against the service brake piston 120 , and the first axis C1 passes through the projection contour of the eccentric portion 152 in the axial direction of the first axis C1 .

[0134] By adopting such a solution, the main body 151 is arranged around the second axis C2, so that the parking brake piston 130 can act evenly on the transmission member 150, thereby improving the movement stability of the transmission member 150. At the same time, by limiting the first axis C1 to pass through the eccentric portion 152, the eccentric portion 152 is in stable contact with the service brake piston 120, and then the transmission member 150 can act evenly on the service brake piston 120, thereby improving the movement stability of the service brake piston 120.

[0135] In some embodiments, reference Figure 5 and Fig.11 The brake seat 110 is formed with a first guide groove 110c and a second guide groove 110d.

[0136] At least part of the service brake piston 120 is located in the first guide groove 110c, and the service brake piston 120 is slidably matched with the groove wall of the first guide groove 110c, so that the service brake piston 120 moves stably along the axial direction of the first axis C1. At least part of the transmission member 150 is located in the second guide groove 110d, and the transmission member 150 is slidably matched with the groove wall of the second guide groove 110d, so that the service brake piston 120 moves stably along the axial direction of the first axis C1. The first guide groove 110c is connected to the second guide groove 110d, so that the service parking piston can extend into the second guide groove 110d, ensuring that the service parking piston and the transmission member 150 can effectively contact each other.

[0137] In some embodiments, reference Figure 5 , Figure 7 and Figure 8 The brake device 100 further includes a return elastic member 142 . The return elastic member 142 is extended along the axial direction of the second axis C2 ; one end of the return elastic member 142 abuts against the brake seat 110 , and the other end abuts against the conductive member 150 .

[0138] Exemplarily, the return elastic member 142 is a compression spring.

[0139] By adopting such a scheme, through the setting of the return elastic member 142, when the parking piston chamber 100b is filled with oil, the parking brake piston 130 moves away from the service brake piston 120 under the action of the hydraulic oil in the parking piston chamber 100b and compresses the parking elastic member 141. The conductive member 150 is separated from the contact with the service brake piston 120 under the push of the return elastic member 142, thereby ensuring effective release of parking.

[0140] In some embodiments, reference Figure 5 , Figure 7 and Fig.10 The brake seat 110 has a third accommodating groove 110e, the conductive member 150 has a fourth accommodating groove 150a, one end of the return elastic member 142 extends into the third accommodating groove 110e, and the other end of the return elastic member 142 extends into the fourth accommodating groove 150a.

[0141] By adopting such a scheme, not only can the third accommodating groove 110e and the fourth accommodating groove 150a be used to constrain the return elastic member 142, so that the return elastic member 142 provides a stable elastic force in a direction parallel to the second axis C2, but also a portion of the length of the return elastic member 142 overlaps with the conductive member 150 and the brake seat 110 in the axial direction of the second axis C2, thereby reducing the required axial size of the brake seat 110.

[0142] In some embodiments, reference Figure 3 , Figure 4 , Figure 7 and Figure 8 The brake seat 110 has or is connected with: a guide body 160 .

[0143] The guide body 160 has a guide hole 160a extending axially along the second axis C2; at least part of the conductive member 150 can be slidably disposed in the guide hole 160a. The provision of the guide hole 160a further guides the movement of the conductive member 150, thereby improving the movement stability of the conductive body.

[0144] The conductive member 150 also forms a limiting flange 153, and the projection of the limiting flange 153 in the axial direction of the second axis C2 at least partially overlaps with the projection of the guide body 160 in the axial direction of the second axis C2. It can be understood that the outer contour size of the limiting flange 153 is larger than the aperture of the guide through hole 160a. Through the cooperation of the limiting flange 153 and the guide body 160, the displacement stroke of the conductive member 150 is limited to prevent the conductive member 150 from excessively entering the guide through hole 160a.

[0145] As a preferred solution, refer to Figure 4 and Figure 7The parking piston chamber 100b is formed between the guide body 160 and the parking brake piston 130. The brake device 100 further includes a first sealing ring 181, which is respectively provided between the guide body 160 and the brake seat 110, between the parking brake piston 130 and the brake seat 110, and between the parking brake piston 130 and the guide body 160 to form a seal for the parking piston chamber 100b.

[0146] As a preferred solution, refer to Figure 4 and Figure 5 The brake device 100 further includes a second sealing ring 182, which is disposed between the service brake piston 120 and the brake seat 110 to seal the service piston chamber 100a.

[0147] In some embodiments, reference Figure 3 and Figure 6 The braking device 100 further includes: a driving elastic member 171 .

[0148] The driving elastic member 171 is used to release or provide driving brake pressure; one end of the driving elastic member 171 abuts against the driving brake piston 120 , and the other end is coupled to the brake seat 110 .

[0149] Exemplarily, the driving elastic member 171 is a compression spring.

[0150] By adopting such a scheme, through the setting of the driving elastic member 171, when the driving piston chamber 100a is filled with oil, the driving brake piston 120 compresses the driving elastic member 171 under the pressure of the hydraulic oil while pressing the friction plate group 230, thereby achieving a driving brake effect.

[0151] When the service piston chamber 100a leaks oil, the pressure of the hydraulic oil in the service piston chamber 100a is released, and the service brake piston 120 moves away from the friction plate group 230 under the elastic action of the service elastic member 171, and finally the service brake is released.

[0152] In some embodiments, reference Figure 3 and Figure 6 The braking device 100 further includes: a support member 172 .

[0153] The support member 172 forms a limiting boss 172a to abut against the driving elastic member 171; the driving elastic member is sleeved on the support member 172, and one end of the support member 172 away from the limiting boss 172a is fixedly connected to the brake seat 110. The support member 172 is provided to provide support for the driving elastic member 171, so as to prevent the driving elastic member 171 from bending in the radial direction when being pressed, thereby improving the shape stability of the driving elastic member 171.

[0154] Exemplarily, the elastic member is located on a side of the service brake piston 120 away from the parking brake piston 130 , and one end of the support member 172 away from the limiting boss 172 a passes through the service brake piston 120 and is fixedly connected to the brake seat 110 .

[0155] In some embodiments, reference Figures 1 to 3 The brake seat 110 includes a service brake housing 111 and a parking brake housing 112 .

[0156] The service brake piston 120 is disposed inside the service brake housing 111 . The service brake housing 111 has a service oil port 111 a . The service oil port 111 a is communicated with the service piston chamber 100 a .

[0157] The parking brake piston 130 is disposed inside the parking brake housing 112; the parking brake housing 112 is detachably connected to the service brake housing 111. The parking brake housing 112 has a parking oil port 112a, which is communicated with the parking piston chamber 100b.

[0158] By adopting such a solution, the brake seat 110 is composed of a service brake housing 111 and a parking brake housing 112, thereby reducing the difficulty of processing the brake seat 110. At the same time, a split setting is adopted to facilitate the assembly of the service brake piston 120, the parking brake piston 130, the conductive member 150, etc.

[0159] In some embodiments, reference Figures 1 to 3 , Fig.11 The service brake housing 111 has a first mounting portion 111b and a second mounting portion 111c.

[0160] The first mounting portion 111 b is used to be fixed to an external device, such as a housing of a driving motor or a reducer. The second mounting portion 111 c is used to fix at least the parking brake housing 112 .

[0161] In the axial direction of the second axis C2, the first mounting portion 111b and the second mounting portion 111c are located at different positions. The second mounting portion 111c is formed with a clearance notch 111d, and the side wall of the clearance notch 111d is disposed around the second axis C2.

[0162] Exemplarily, the first guide groove 110c and the second guide groove 110d are both provided on the first mounting portion 111b.

[0163] By adopting such a solution and providing the clearance gap 111d, an operating space is provided for machining the second guide groove 110d.

[0164] This application describes the working process of the braking device 100 by way of example:

[0165] When service braking is required, hydraulic oil (brake fluid) enters the service piston chamber 100a from the service oil port 111a, pushing the service brake piston 120 to move in the direction of compressing the friction plate group 230; as the friction plate group 230 is compressed, a braking effect is exerted.

[0166] When the service brake needs to be released, the brake pedal is retracted, the hydraulic pressure of the service piston chamber 100a is released, and the service elastic member 171 pushes the service brake piston 120 back away from the friction plate group 230 while resisting the support member 172, thereby releasing the service brake.

[0167] When parking brake is needed, hydraulic oil flows out from the parking piston chamber 100b along the parking oil port 112a. As the pressure in the parking piston chamber 100b is released, the parking elastic member 141 compressed by the parking brake piston 130 pushes the parking brake piston 130 and the transmission member 150 to move toward the direction of the service brake piston 120. As the hydraulic pressure is continuously released, the transmission member 150 finally pushes against the service brake piston 120 and presses the friction plate group 230, thereby achieving the parking brake effect.

[0168] When the parking brake needs to be released, hydraulic oil enters the parking piston chamber 100b from the parking oil inlet, and the hydraulic pressure pushes the parking brake piston 130 to move in the direction of compressing the parking elastic member 141. As the parking elastic member 141 continues to be compressed, the transmission member 150 eventually breaks away from the contact with the service brake piston 120 under the push of the return elastic member 142, and the parking is released.

[0169] According to the second aspect of the present application, referring to Figure 1 , Figure 2 and Fig.12 , 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.

[0170] In some embodiments, reference Figures 1 to 3 The drive axle 10 further includes: a primary transmission shaft 210 , a secondary transmission shaft 220 and a friction plate group 230 .

[0171] The primary transmission shaft 210 has or is connected to a primary driving gear 211; the secondary transmission shaft 220 has a secondary driven gear 221 meshing with the primary driving gear 211. The primary transmission shaft 210 and the secondary transmission shaft 220 are rotatably connected to the service brake housing 111, respectively.

[0172] The friction plate group 230 includes a first friction plate 231 and a second friction plate 232. The first friction plate 231 is fixedly connected to the brake seat 110 and can slide relative to the brake seat 110 in the axial direction; the second friction plate 232 is fixedly connected to the secondary transmission shaft 220 and can slide relative to the secondary transmission shaft 220 in the axial direction; the first friction plate 231 and the second friction plate 232 are configured to brake the secondary transmission shaft 220 by friction.

[0173] Exemplarily, the first friction plate 231 and the brake seat 110 are spline-matched, and the second friction plate 232 and the primary driven gear 221 are spline-matched.

[0174] By adopting such a solution, the friction plate is associated with the secondary transmission shaft 220, so as to brake the secondary transmission shaft, reduce the friction loss of the first friction plate 231 and the second friction plate 232, and help reduce energy consumption.

[0175] Optionally, the first friction plate 231 is a steel plate, and the material of the first friction plate 231 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.

[0176] In some embodiments, reference Figures 1 to 3 , two primary transmission shafts 210, two secondary transmission shafts 220, two friction plate groups 230 and two brake seats 110 are respectively provided, and the two primary transmission shafts 210 are respectively connected to a differential 241;

[0177] The drive axle 10 further includes a drive device 250, which is used to output a driving torque to the differential 241, thereby driving the two primary transmission shafts 210 to rotate. The two brake seats 110, the secondary transmission shaft 220 and the friction plate group 230 are symmetrically arranged relative to the drive device 250. By adopting a symmetrical design, the manufacturing cost of the drive axle 10 can be reduced.

[0178] Exemplarily, the primary transmission shaft 210 on one side is connected to the differential 241 via an intermediate transmission shaft 242 .

[0179] The drive device 250 uses a drive motor, and the first mounting portion 111b of the service brake housing 111 is connected to the housing of the drive device 250. The motor shaft 251 of the drive device 250 is fixedly connected to the housing of the differential 241, and the intermediate transmission shaft 242 is passed through the motor shaft 251.

[0180] In some embodiments, reference Figures 1 to 3The drive axle 10 further includes a secondary reduction mechanism 260 . The secondary reduction mechanism 260 includes a reduction housing 261 , a sun gear 262 , a planetary gear 263 , and a planetary carrier 264 .

[0181] The reduction housing 261 is fixedly connected to the second mounting portion 111c, and has a gear ring inside. The sun gear 262 is interference fit or spline fit with the secondary transmission shaft 220 to achieve a non-rotating fit. The power is transmitted to the sun gear 262 after being reduced by the primary driving gear 211 and the primary driven gear 221, and then the sun gear 262 rotates synchronously with the secondary transmission shaft 220. A plurality of planetary gears 263 are provided, which are spaced and distributed in the circumference of the sun gear 262 and mesh with the sun gear 262 and the gear ring at the same time. The planetary gears 263 are rotatably connected to the planet carrier 264, and the power is output by the planet carrier 264. The planet carrier 264 is used to connect to the wheels, thereby driving the wheels to drive.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0186] 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: Brake seat; A service brake piston, used to apply or release service brake pressure to a drive shaft in a vehicle; A parking brake piston for applying or releasing parking brake pressure to a drive shaft in a vehicle; The parking brake piston and the service brake piston form a transmission coupling so that the service brake pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston acts on a transmission shaft in a vehicle in a force transmission manner.

2. The braking device according to claim 1, characterized in that: The service brake pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston acts on a secondary drive shaft in a vehicle.

3. The braking device according to claim 1, characterized in that: The service brake piston slides axially along the first axis to provide or release service brake pressure to a friction plate group; the parking brake piston slides axially along the second axis to provide or release parking brake pressure to the service brake piston; Wherein, the first axis is arranged on one side of the second axis; and the service brake piston is located between the parking brake piston and the friction plate group.

4. The braking device according to claim 1, characterized in that: A service piston cavity is formed between the service brake piston and the brake seat, and the service brake piston slides relative to the brake seat when the service piston cavity is filled with oil or drained of oil; A parking piston cavity is formed between the parking brake piston and the brake seat, and the parking brake piston slides relative to the brake seat when the parking piston cavity is filled with oil or drained of oil.

5. The braking device according to claim 3, characterized in that: The first axis and the second axis are parallel to each other.

6. The braking device according to claim 3, characterized in that: The braking device also includes: A parking elastic member, used for releasing or providing the parking brake pressure; Wherein, one end of the parking elastic member abuts against the parking brake piston, and the other end abuts against the brake seat.

7. The braking device according to claim 6, characterized in that: The parking brake piston has a first accommodating groove, the brake seat has a second accommodating groove, one end of the parking elastic member extends into the first accommodating groove, and the other end of the parking elastic member extends into the second accommodating groove.

8. The braking device according to claim 3, characterized in that: The braking device also includes: A transmission member, at least partially disposed between the parking brake piston and the service brake piston to constitute the transmission of the parking brake pressure; The conductive member is slidably disposed inside the brake seat, one end of the conductive member abuts against the parking brake piston, and at least a portion of the other end of the conductive member abuts against the service brake piston.

9. The braking device according to claim 8, characterized in that: The conductive member has: A main body portion, arranged around the second axis; an eccentric portion, at least a portion of which abuts against the service brake piston; The first axis passes through a projection contour of the eccentric portion in the axial direction of the first axis.

10. The braking device according to claim 8, characterized in that: The brake seat is formed with a first guide groove, in which at least a portion of the service brake piston is located; a second guide groove, wherein at least a portion of the conductive member is located in the second guide groove; Wherein, the first guide groove is communicated with the second guide groove.

11. The braking device according to claim 8, characterized in that: The braking device also includes: A return elastic member is provided extending along the axial direction of the second axis; Wherein, one end of the return elastic member abuts against the brake seat, and the other end abuts against the conductive member.

12. The braking device according to claim 11, characterized in that: The brake seat has a third accommodating groove, the conductive member has a fourth accommodating groove, one end of the return elastic member extends into the third accommodating groove, and the other end of the return elastic member extends into the fourth accommodating groove.

13. The braking device according to claim 8, characterized in that: The brake seat has or is connected with: A guide body having a guide through hole extending axially along the second axis; Wherein, at least part of the conductive member can be slidably disposed in the guide through hole; The conductive member further forms a limiting flange, and a projection of the limiting flange in the axial direction of the second axis at least partially overlaps with a projection of the guide body in the axial direction of the second axis.

14. The braking device according to any one of claims 1 to 13, characterized in that: The braking device also includes: A driving elastic member, used to release or provide the driving brake pressure; Wherein, one end of the driving elastic member abuts against the driving brake piston, and the other end is combined with the brake seat.

15. The braking device according to claim 14, characterized in that: The braking device also includes: A support member, forming a limited boss to abut against the travel elastic member; Wherein, the driving elastic member is sleeved on the support member, and one end of the support member away from the limiting boss is fixedly connected to the brake seat.

16. The braking device according to any one of claims 1 to 13, characterized in that: The brake seat comprises: A service brake housing, wherein the service brake piston is disposed inside the service brake housing; A parking brake housing, wherein the parking brake piston is disposed inside the parking brake housing; Wherein, the parking brake housing is detachably connected to the service brake housing; the service brake housing has a service oil port, which is communicated with the service piston chamber; the parking brake housing has a parking oil port, which is communicated with the parking piston chamber.

17. The braking device according to claim 16, characterized in that: The service brake housing has: A first mounting portion, used for fixing to an external device; a second mounting portion, at least used to fix the parking brake housing; In the axial direction of the second axis, the first mounting portion and the second mounting portion are located at different positions, the second mounting portion is formed with a clearance gap, and the side wall of the clearance gap is arranged around the second axis.

18. A drive axle, characterized in that: Comprising a braking device as claimed in any one of claims 1 to 17.

19. The drive axle according to claim 18, characterized in that: The drive axle further comprises: A primary transmission shaft having or connected to a primary driving gear; a secondary transmission shaft having a primary driven gear meshing with the primary driving gear; A friction plate group, comprising a first friction plate and a second friction plate; Wherein, the first friction plate is connected to the brake seat for preventing rotation, and the second friction plate is connected to the secondary transmission shaft for preventing rotation; the first friction plate and the second friction plate are configured to brake the secondary transmission shaft by friction force.

20. The drive axle according to claim 19, characterized in that: The first-stage transmission shaft, the second-stage transmission shaft, the friction plate group and the brake seat are respectively provided with two, and the two first-stage transmission shafts are respectively connected to a differential; The drive axle further comprises: A driving device, used for outputting a driving torque to the differential; Wherein, the two brake seats, the secondary transmission shaft and the friction plate group are symmetrically arranged relative to the driving device.

21. A vehicle, characterized in that: A drive axle comprising any one of claims 18 to 20.

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