Braking device, drive axle and vehicle

Abstract

The application relates to a brake device, a drive axle and a vehicle, wherein the brake device comprises: a brake seat; a service brake piston for providing or releasing service brake pressure to a drive shaft in a vehicle; a parking brake piston for providing or releasing parking brake pressure to the drive shaft in the vehicle; the parking brake piston and the service brake piston are in transmission coupling to enable the service brake pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston to act on the drive shaft in the vehicle in a force transmission mode. The application has the beneficial effect of providing a brake device, a drive axle and a vehicle with improved assembly flexibility through the transmission coupling of the service brake piston and the parking brake piston.

Description

TECHNICAL FIELD

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

[0002] At present, most of the vehicle brake systems adopt the scheme of service brake + parking brake. In the prior art, the service brake piston or the parking brake piston is used to apply pressure to the transmission shaft to realize braking and parking, which requires sufficient arrangement space of the service brake piston or the parking brake piston in the radial direction of the transmission shaft.

[0003] In some space-limited scenarios (for example, the radial installation space is limited), the scheme of applying pressure to the transmission shaft by the service brake piston and the parking brake piston respectively has limitations, is prone to interference with other components, and has poor assembly flexibility. SUMMARY

[0004] The embodiments of the present application provide a brake device, which improves the assembly flexibility of the brake device to at least partially solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a brake device is provided, comprising:

[0006] a brake seat;

[0007] a service brake piston configured to provide or release service brake pressure to a transmission shaft in a vehicle;

[0008] a parking brake piston configured to provide or release parking brake pressure to the transmission shaft in the vehicle;

[0009] The parking brake piston and the service brake piston constitute 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 the transmission shaft in the 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 the vehicle.

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

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

[0013] 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 set.

[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 brake device further comprises:

[0018] A parking elastic member for releasing or providing the parking brake pressure.

[0019] One end of the parking elastic member is in abutment with the parking brake piston, and the other end is in abutment with 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 brake device further comprises:

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

[0023] One end of the conducting member is in abutment with the parking brake piston, and at least part of the other end of the conducting member is in abutment with the service brake piston.

[0024] Optionally, the conducting member has:

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

[0026] An eccentric portion, at least part of which is in abutment with the service brake piston;

[0027] The first axis passes through a projection profile 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, at least part of the service brake piston is located in the first guide groove;

[0030] A second guide slot, at least part of the conducting member is located in the second guide slot;

[0031] The first guide slot and the second guide slot are in communication.

[0032] Optionally, the brake device further comprises:

[0033] A return elastic member, which is arranged along the axial direction of the second axis;

[0034] One end of the return elastic member is in abutment with the brake seat, and the other end is in abutment with the conducting member.

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

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

[0037] A guide body, which has a guide through hole extending along the axial direction of the second axis;

[0038] At least part of the conducting member can be slidably arranged in the guide through hole.

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

[0040] Optionally, the brake device further comprises:

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

[0042] One end of the service brake elastic member is in abutment with the service brake piston, and the other end is combined to the brake seat.

[0043] Optionally, the brake device further comprises:

[0044] A support member, which forms a limiting boss to abut against the service brake elastic member;

[0045] The service brake 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, and the service brake piston is arranged inside the service brake housing;

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

[0049] The parking brake housing is detachably connected to the service brake housing; the service brake housing has a service brake oil port, which is in communication with the service brake piston cavity; the parking brake housing has a parking brake oil port, which is in communication with the parking brake piston cavity.

[0050] Optionally, the service brake housing has:

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

[0052] A second mounting portion for fixing at least the parking brake housing;

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

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

[0055] Optionally, the drive axle further comprises:

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

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

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

[0059] The first friction plate is rotationally connected to the brake seat, and the second friction plate is rotationally connected to the secondary transmission shaft; the first friction plate and the second friction plate are configured to brake the secondary transmission shaft by friction.

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

[0061] The drive axle further comprises:

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

[0063] The two brake seats, secondary transmission shafts and friction plate sets 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 effects of this application are: it provides a braking device, drive axle, and vehicle that improves assembly flexibility by forming a transmission coupling through a service brake piston and a parking brake piston.

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

[0067] By forming a transmission coupling between the parking brake piston and the service brake piston, the service braking pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston are applied to the drive shaft in a vehicle in a force transmission manner. This allows the service brake piston and the parking brake piston to be offset in the radial or axial direction of the drive shaft, avoiding other components in the radial or axial direction of the drive shaft, preventing interference, and improving assembly flexibility.

[0068] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0069] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0070] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

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

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

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

[0074] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

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

[0076] Figure 6 yes Figure 3 An enlarged schematic diagram of section C;

[0077] Figure 7 is a cross-sectional view of another part of the drive axle provided in the exemplary embodiments of the present application;

[0078] Figure 8 is an exploded view of a part of the drive axle provided in the exemplary embodiments of the present application

[0079] Figure 9 is a perspective view of a parking brake housing of the drive axle provided in the exemplary embodiments of the present application;

[0080] Figure 10 is a perspective view of a conducting member of the drive axle provided in the exemplary embodiments of the present application;

[0081] Figure 11 is a perspective view of a service brake housing of the drive axle provided in the exemplary embodiments of the present application;

[0082] Figure 12 is a front view of the drive axle provided in the exemplary embodiments of the present application.

[0083] BRIEF DESCRIPTION OF DRAWINGS

[0084] 100, brake device;

[0085] 100a, service piston cavity; 100b, parking piston cavity;

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

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

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

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

[0093] 171, service elastic member; 172, support 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 set; 231, first friction plate; 232, second friction plate;

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

[0100] 260, secondary reduction mechanism; 261, reduction housing; 262, sun gear; 263, planetary gear; 264, planet carrier. DETAILED DESCRIPTION

[0101] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

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

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

[0104] The service brake piston 120 is used to provide or release the service brake pressure to the transmission shaft in a vehicle; it can be understood that the service brake pressure can be directly provided by the service brake piston 120 to the transmission 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 the transmission shaft in a vehicle; the parking brake pressure can be directly provided by the parking brake piston 130 to the transmission shaft in a vehicle to achieve parking; or, the parking brake pressure is provided by other pressure components, for example, a spring, which transmits a pushing force to the transmission shaft by spring, and the parking brake piston 130 acts on the pressure component to release the parking brake pressure of the transmission shaft. The working mode of the parking brake piston 130 can be determined according to the actual product design requirements.

[0106] The parking brake piston 130 is in transmission coupling with the service brake piston 120, 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 the 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 speed as the output shaft of the driving device 250, and the secondary transmission shaft 220 is at least one-stage decelerated 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, the parking brake piston 130 is in transmission coupling with 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 act on the transmission 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 direction or the axial direction of the transmission shaft can be staggered, avoiding other components such as the deceleration housing and the differential existing in the radial direction or the axial direction of the transmission shaft, avoiding interference, and improving assembly flexibility.

[0110] In some embodiments, with reference to 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 the 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] With such a scheme, it is helpful to reduce energy consumption, improve transmission efficiency, and reduce the temperature rise generated by braking.

[0113] In some embodiments, referring to Figures 2 to 4 , the service brake piston 120 is axially slidable along a first axis C1 to provide or release service brake pressure to a friction plate set 230. The parking brake piston 130 is axially slidable along a second axis C2 to provide or release parking brake pressure to the service brake piston 120. The first axis C1 is disposed on one side of the second axis C2, i.e. the first axis C1 and the second axis C2 can be parallel or inclined, and the service brake piston 120 is located between the parking brake piston 130 and the friction plate set 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 set 230, so that the friction plate set 230 generates friction to achieve braking; or the service brake piston 120 moves away from the friction plate set 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 pressing the friction plate set 230 through the service brake piston 120; or the parking brake pressure is provided by other pressure components, such as a spring, which applies a pushing force to the service brake piston 120 to press the friction plate set 230, and the parking brake piston 130 acts on the pressure component or the service brake piston 120 to release the pushing force of 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, referring to Figures 2 to 5 , the service brake piston 120 and the brake seat form a service piston cavity 100a, and the service brake piston 120 slides relative to the brake seat when the service piston cavity 100a is filled with oil or drained; the parking brake piston 130 and the brake seat form a parking piston cavity 100b, and the parking brake piston 130 slides relative to the brake seat when the parking piston cavity 100b is filled with oil or drained.

[0117] For example, when the service piston cavity 100a is filled with oil, the service brake piston 120 moves towards the friction plate set 230 under the pressure of the hydraulic oil in the service piston cavity 100a, and then presses the friction plate set 230. When the service piston cavity 100a is drained, the service brake piston 120 at least moves away from the friction plate set 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 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, the parking brake piston 130 at least moves towards the service brake piston 120 under the pressure of the hydraulic oil in the parking piston chamber 100b.

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

[0120] In some embodiments, referring to Figure 3 , the first axis C1 is parallel to the second axis C2. In this way, the compactness of the service brake piston 120 and the parking brake piston 130 in spatial arrangement can be improved, and 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, reducing the loss of force.

[0121] In some embodiments, referring to Figure 3 , Figure 4 , Figure 7 and Figure 8 , the brake device 100 further comprises a parking elastic member 141.

[0122] The parking elastic member 141 is used to release or provide parking brake pressure; 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] For example, the parking elastic member 141 is a compression spring, and the parking elastic member 141 is arranged on the 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] With such a solution, when the parking piston chamber 100b is drained, the parking brake piston 130 moves towards the service brake piston 120 under the elastic action of the parking elastic member 141, and finally the transmission member 150 pushes against the service brake piston 120 to compress the friction plate set 230, playing a parking brake role.

[0125] When the parking piston cavity 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, and the pressure of the parking brake piston 130 on the service brake piston 120 continuously decreases with the continuous compression of the parking elastic element 141, and finally the parking is released.

[0126] In some embodiments, referring to Figure 7 and Figure 8 , the parking elastic element 141 is provided in multiple, and the multiple parking elastic elements 141 are arranged in the circumferential direction of the second axis C2, providing uniform elastic force to the parking brake piston 130 in the circumferential direction, and more specifically, the parking elastic element 141 is also arranged in multiple groups in the radial direction of the second axis C2, further improving the size of the elastic force, so that the length of the parking elastic element 141 can be reduced under the condition of obtaining the same elastic force, thereby reducing the overall volume of the brake device 100.

[0127] In some embodiments, referring to Figure 3 , Figure 4 and Figure 7 , the parking brake piston 130 has a first accommodating groove 130a, and the brake seat 110 has a second accommodating groove 110b, and the first accommodating groove 130a and the second accommodating groove 110b correspond one by one. One end of the parking elastic element 141 extends into the first accommodating groove 130a, and the other end of the parking elastic element 141 extends into the second accommodating groove 110b.

[0128] With such a scheme, not only can the first accommodating groove 130a and the second accommodating groove 110b be used to constrain the parking elastic element 141, so that the parking elastic element 141 provides a stable elastic force in the direction parallel to the second axis C2, but also a part of the length of the parking elastic element 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 size of the brake seat 110 in the axial direction.

[0129] In some embodiments, referring to Figures 3 to 5 , Figure 7 and Figure 8 , the brake device 100 further comprises a conducting member 150.

[0130] At least part of the conducting member 150 is arranged between the parking brake piston 130 and the service brake piston 120 to constitute the transmission of the parking brake pressure. Wherein, the conducting member 150 is slidingly arranged inside the brake seat 110, one end of the conducting member 150 abuts against the parking brake piston 130, and at least part of the other end of the conducting member 150 abuts against the service brake piston 120.

[0131] With such a scheme, since the positions of the service brake piston 120 and the parking brake piston 130 in the radial direction are staggered, and the conducting member 150 is arranged, stable pressure transmission can be formed by the service brake piston 120 and the parking brake piston 130.

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

[0133] The main body portion 151 is arranged around the second axis C2, and the main body portion 151 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 profile of the eccentric portion 152 in the axial direction of the first axis C1.

[0134] With such a scheme, by arranging the main body portion 151 around the second axis C2, the parking brake piston 130 can uniformly act on the conducting member 150, improving the motion stability of the conducting member 150. At the same time, by limiting the first axis C1 to pass through the eccentric portion 152, the eccentric portion 152 stably contacts the service brake piston 120, and the conducting member 150 can uniformly act on the service brake piston 120, improving the motion stability of the service brake piston 120.

[0135] In some embodiments, with reference to Figure 5 and Figure 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 by the sliding fit of the service brake piston 120 and the groove wall of the first guide groove 110c, the service brake piston 120 stably moves along the axial direction of the first axis C1. At least part of the conducting member 150 is located in the second guide groove 110d, and by the sliding fit of the conducting member 150 and the groove wall of the second guide groove 110d, the service brake piston 120 stably moves along the axial direction of the first axis C1. The first guide groove 110c and the second guide groove 110d are communicated, so that the service brake piston can extend into the second guide groove 110d, ensuring that the service brake piston and the conducting member 150 can effectively contact.

[0137] In some embodiments, with reference to Figure 5 , Figure 7 and Figure 8 The brake device 100 further comprises a return elastic member 142. The return elastic member 142 is arranged to extend 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 conducting member 150.

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

[0139] With such a scheme, when the parking piston chamber 100b is filled with hydraulic 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 the return elastic member 142 is compressed, and the transmission member 150 is pushed by the return elastic member 142 to disengage from the service brake piston 120, thereby effectively releasing the parking.

[0140] In some embodiments, referring to Figure 5 , Figure 7 and Figure 10 , the brake seat 110 has a third accommodating groove 110e, the transmission 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] With such a scheme, not only can the third accommodating groove 110e and the fourth accommodating groove 150a constrain the return elastic member 142, so that the return elastic member 142 provides a stable elastic force in the direction parallel to the second axis C2, but also a part of the length of the return elastic member 142 coincides with the transmission member 150 and the brake seat 110 in the axial direction of the second axis C2, thereby reducing the size of the brake seat 110 in the axial direction.

[0142] In some embodiments, referring to 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 through hole 160a extending in the axial direction of the second axis C2, and at least part of the transmission member 150 can slide through the guide through hole 160a. By providing the guide through hole 160a, the movement of the transmission member 150 is further guided, and the stability of the movement of the transmission member is improved.

[0144] The transmission member 150 further forms a limiting flange 153, and a projection of the limiting flange 153 in the axial direction of the second axis C2 at least partially coincides with a 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 greater than the hole diameter of the guide through hole 160a. By cooperation of the limiting flange 153 and the guide body 160, the displacement stroke of the transmission member 150 is limited, and the transmission member 150 is prevented from excessively entering the guide through hole 160a.

[0145] As a preferred scheme, referring to Figure 4 and Figure 7The parking piston cavity 100b is formed between the guide body 160 and the parking brake piston 130. The brake device 100 further comprises a first sealing ring 181, which is arranged 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, respectively, to seal the parking piston cavity 100b.

[0146] As a preferred solution, referring to Figure 4 and Figure 5 , the brake device 100 further comprises a second sealing ring 182, which is arranged between the service brake piston 120 and the brake seat 110 to seal the service piston cavity 100a.

[0147] In some embodiments, referring to Figure 3 and Figure 6 , the brake device 100 further comprises a service elastic member 171.

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

[0149] Illustratively, the service elastic member 171 is a compression spring.

[0150] With such a solution, with such a solution, when the service piston cavity 100a is filled with oil, the service brake piston 120 compresses the service elastic member 171 while pressing the friction plate set 230 under the pressure of the hydraulic oil, thereby playing a service brake role.

[0151] When the service piston cavity 100a is drained, the pressure of the hydraulic oil in the service piston cavity 100a is released, and the service brake piston 120 moves away from the friction plate set 230 under the elastic action of the service elastic member 171, thereby ultimately releasing the service brake.

[0152] In some embodiments, referring to Figure 3 and Figure 6 , the brake device 100 further comprises a support member 172.

[0153] The support member 172 forms a limiting boss 172a to abut the service elastic member 171; the service 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. Through the arrangement of the support member 172, the service elastic member 171 is supported, avoiding the service elastic member 171 from bending in the radial direction when being pressed, thereby improving the shape stability of the service elastic member 171.

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

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

[0156] The service brake piston 120 is arranged inside the service brake housing 111, and the service brake housing 111 has a service oil port 111a in communication with the service piston cavity 100a.

[0157] The parking brake piston 130 is arranged inside the parking brake housing 112, and 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 in communication with the parking piston cavity 100b.

[0158] With such a scheme, the brake seat 110 is composed of the service brake housing 111 and the parking brake housing 112, which reduces the machining difficulty of the brake seat 110, and the separate arrangement facilitates the assembly of the service brake piston 120, the parking brake piston 130, and the conducting member 150.

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

[0160] The first mounting portion 111b is used for fixing to an external device, such as a housing of a driving motor or a speed reducer. The second mounting portion 111c is used for fixing 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, and the second mounting portion 111c is formed with a relief gap 111d, and the side wall of the relief gap 111d is arranged around the second axis C2.

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

[0163] With such a scheme, the provision of the relief gap 111d provides operating space for machining of the second guide groove 110d.

[0164] The application exemplarily describes the working process of the brake device 100:

[0165] When the service brake is needed, hydraulic oil (brake fluid) enters the service piston chamber 100a from the service oil port 111a, pushing the service brake piston 120 to move towards the compressed friction plate set 230; with the compression of the friction plate set 230, the braking effect is achieved.

[0166] When the service brake is needed to be released, the brake pedal is retracted, the hydraulic pressure of the service piston chamber 100a is released, and the service brake spring 171, under the support of the support 172, pushes the service brake piston 120 back away from the friction plate set 230, releasing the service brake.

[0167] When the parking brake is needed, hydraulic oil flows out of the parking piston chamber 100b along the parking oil port 112a, and due to the release of pressure in the parking piston chamber 100b, the parking brake spring 141, compressed by the parking brake piston 130, pushes the parking brake piston 130 and the transmission 150 to move towards the service brake piston 120, and with the continuous release of hydraulic pressure, the transmission 150 eventually pushes against the service brake piston 120 and compresses the friction plate set 230, achieving the parking brake effect.

[0168] When the parking brake is needed to be released, hydraulic oil enters the parking piston chamber 100b from the parking oil port, and the hydraulic pressure pushes the parking brake piston 130 to move towards the compression of the parking brake spring 141, and with the continuous compression of the parking brake spring 141, the transmission 150 eventually separates from the contact with the service brake piston 120 under the push of the return spring 142, releasing the parking brake.

[0169] According to the second aspect of the present application, referring to Figure 1 , Figure 2 and Figure 12 , a drive axle 10 is provided, which comprises the above-mentioned brake device 100. The drive axle 10 has all the beneficial effects of the above-mentioned brake device 100, which will not be repeated here.

[0170] In some embodiments, referring to Figures 1 to 3 , the drive axle 10 further comprises: a primary transmission shaft 210, a secondary transmission shaft 220, and a friction plate set 230.

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

[0172] The friction plate set 230 includes a first friction plate 231 and a second friction plate 232. The first friction plate 231 is rotationally connected to the brake seat 110 and axially slidable relative to the brake seat 110; the second friction plate 232 is rotationally connected to the secondary transmission shaft 220 and axially slidable relative to the secondary transmission shaft 220; 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 is in spline fit with the brake seat 110, and the second friction plate 232 is in spline fit with the primary driven gear 221.

[0174] With such a scheme, by associating the friction plate with the secondary transmission shaft 220, a braking effect is exerted on the secondary transmission shaft, reducing the friction loss of the first friction plate 231 and the second friction plate 232, and facilitating reduction of 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 an asbestos material, a NAO friction material (Non-Asbestos Organic), a semi-metallic material, a ceramic material, a powder metallurgy friction material (sintered friction material), a carbon fiber friction material, etc.

[0176] In some embodiments, referring to Figures 1 to 3 The primary transmission shaft 210, the secondary transmission shaft 220, the friction plate set 230, and the brake seat 110 are respectively provided with two, and the two primary transmission shafts 210 are respectively drivingly connected to a differential 241.

[0177] The drive axle 10 further includes a driving device 250 for outputting 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 set 230 are symmetrically arranged relative to the driving device 250. By adopting a symmetric design, the manufacturing cost of the drive axle 10 can be reduced.

[0178] Exemplarily, one of the primary transmission shafts 210 is connected to the differential 241 through an intermediate transmission shaft 242.

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

[0180] In some embodiments, referring to Figures 1 to 3The drive axle 10 further comprises a second-stage speed reduction mechanism 260. The second-stage speed reduction mechanism 260 comprises a speed reduction housing 261, a sun gear 262, a planet gear 263, and a planet carrier 264.

[0181] The speed reduction housing 261 is fixedly connected to the second mounting portion 111c and has a ring gear inside. The sun gear 262 is in interference fit or spline fit with the second-stage transmission shaft 220 to achieve rotation-stopping fit. Power is transmitted to the sun gear 262 after being reduced by the first-stage driving gear 211 and the first-stage driven gear 221, and then the sun gear 262 rotates synchronously with the second-stage transmission shaft 220. The planet gears 263 are provided in plurality and are distributed at intervals in the circumferential direction of the sun gear 262 and simultaneously mesh with the sun gear 262 and the ring gear. The planet gears 263 are rotatably connected to the planet carrier 264, and the planet carrier 264 outputs power and is used to be connected to a wheel to drive the wheel.

[0182] According to a third aspect of the present application, a vehicle is provided, which comprises the drive axle 10 described above, and has all the beneficial effects of the drive axle 10 described above, which will not be repeated herein. The vehicle can be a forklift truck, and the present application can meet the requirements of the forklift truck on driving braking force and parking braking force.

[0183] In the description of the present application, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "plurality" is two or more, unless otherwise specifically limited.

[0184] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

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

[0186] The above is only the preferred embodiments of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, still falls within the scope of the technical solution of the present application.

Claims

1. A brake device characterized by comprising: The brake device comprises: a brake seat; a service brake piston for providing or releasing service brake pressure to a drive shaft in a vehicle; a parking brake piston for providing or releasing parking brake pressure to the drive shaft in the vehicle; the service brake piston and the parking brake piston are in transmission coupling to make the service brake pressure provided by the service brake piston and / or the parking brake pressure provided by the parking brake piston act on the drive shaft in the vehicle in a force transmission manner; the service brake piston slides along a first axis in an axial direction to provide or release service brake pressure to a friction plate set; the parking brake piston slides along a second axis in an axial direction 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; the service brake piston is located between the parking brake piston and the friction plate set.

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

3. The brake device according to claim 1, characterized by A service brake 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 brake piston cavity is filled with oil or drained; A parking brake 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 brake piston cavity is filled with oil or drained.

4. The brake device according to claim 1, characterized by The first axis and the second axis are parallel to each other.

5. The brake device according to claim 1, characterized by The brake device further comprises: a parking spring for releasing or providing the parking brake pressure; wherein one end of the parking spring abuts against the parking brake piston, and the other end of the parking spring abuts against the brake seat.

6. The brake device according to claim 5, characterized by The parking brake piston has a first accommodating groove, the brake seat has a second accommodating groove, one end of the parking spring extends into the first accommodating groove, and the other end of the parking spring extends into the second accommodating groove.

7. The brake device according to claim 1, characterized by The brake device further comprises: a conducting member at least partially arranged between the parking brake piston and the service brake piston to form transmission of the parking brake pressure; wherein the conducting member is slidingly arranged inside the brake seat, one end of the conducting member abuts against the parking brake piston, and at least part of the other end of the conducting member abuts against the service brake piston.

8. The brake device according to claim 7, characterized by The conducting member has: a main body portion arranged around the second axis; an eccentric portion, at least part of the eccentric portion abuts against the service brake piston; The first axis passes through the projection profile of the eccentric portion in the axial direction of the first axis.

9. The brake device according to claim 7, characterized by The brake seat is formed with a first guide groove, at least part of the service brake piston is located in the first guide groove; a second guide groove, at least part of the conducting member is located in the second guide groove; wherein the first guide groove and the second guide groove are in communication.

10. The brake device according to claim 7, characterized by The brake device further comprises: a return spring extending along the second axis in an axial direction; wherein one end of the return spring abuts against the brake seat, and the other end of the return spring abuts against the conducting member.

11. The brake device according to claim 10, characterized by The brake seat has a third accommodating groove, the conducting 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.

12. The brake device according to claim 7, characterized by The brake seat has or is connected with: A guide body has a guide through hole extending in the axial direction of the second axis; At least part of the conducting member is slidably arranged in the guide through hole; The conducting 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 a projection of the guide body in the axial direction of the second axis.

13. The brake device according to any one of claims 1 to 12, characterized by The brake device further comprises: A service brake elastic member is used to release or provide the service brake pressure; One end of the service brake elastic member abuts against the service brake piston, and the other end of the service brake elastic member is combined to the brake seat.

14. The brake device according to claim 13, characterized by The brake device further comprises: A support member forms a limiting boss to abut against the service brake elastic member; The support member is fixedly connected to the brake seat at an end away from the limiting boss.

15. The brake device according to any one of claims 1 to 12, wherein A service brake 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 brake piston cavity is filled with oil or drained of oil; A parking brake 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 brake piston cavity is filled with oil or drained of oil; The brake seat comprises: A service brake housing, and the service brake piston is arranged inside the service brake housing; A parking brake housing, and the parking brake piston is arranged inside the parking brake housing; The parking brake housing is detachably connected to the service brake housing; the service brake housing has a service brake oil port, and the service brake oil port is in communication with the service brake piston cavity; the parking brake housing has a parking brake oil port, and the parking brake oil port is in communication with the parking brake piston cavity.

16. The brake device according to claim 15, characterized in that The service brake housing has: A first mounting portion for being fixed to an external device; A second mounting portion for at least fixing 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 notch, and a side wall of the clearance notch is arranged around the second axis.

17. A drive axle, characterized in that The drive axle further comprises:

18. The drive axle of claim 17, wherein, A primary transmission shaft having or connected with a primary driving gear; A secondary transmission shaft having a primary driven gear meshing with the primary driving gear; A friction plate set comprising a first friction plate and a second friction plate; The first friction plate is rotationally connected to the brake seat, and the second friction plate is rotationally connected to the secondary transmission shaft; the first friction plate and the second friction plate are configured to brake the secondary transmission shaft by friction. The primary transmission shaft, the secondary transmission shaft, the friction plate set and the brake seat are respectively provided with two, and the two primary transmission shafts are respectively drivingly connected to a differential; 19. The drive axle of claim 18, wherein, The drive axle further comprises: ​ A driving device for outputting a driving torque to the differential; The two brake seats, the secondary transmission shaft and the friction plate set are symmetrically arranged relative to the driving device.

20. A vehicle characterized by The drive axle includes any one of claims 17 to 19.

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