Reducing mechanism, drive axle and vehicle

Abstract

The invention relates to a speed reducing mechanism, a drive axle and a vehicle, and the speed reducing mechanism comprises a rotating part which rotates around a rotating axis; the bearing is combined to the rotating part, and the bearing comprises an inner ring and an outer ring; the pre-tightening piece is used for applying pre-tightening force to the inner ring so as to adjust the relative position of the inner ring and the outer ring; the fastening assembly is configured to fix the pre-tightening piece to the rotating piece; wherein at least one part of the fastening assembly is embedded into the rotating piece, and the other part of the fastening assembly is embedded into the pre-tightening piece, so that the fastening assembly transmits torque between the rotating piece and the pre-tightening piece. The speed reducing mechanism, the drive axle and the vehicle have the beneficial effects that the pre-tightening force is applied to the inner ring through the pre-tightening piece fixed to the rotating piece so that the bearing can be conveniently installed and positioned.

Description

Technical Field

[0001] The present application relates to the technical field of speed reducers, and in particular to a speed reduction mechanism, a drive axle and a vehicle. Background Art

[0002] Some rotating parts in the planetary reduction mechanism, such as the planetary carrier, generally require bearings for support. In order to ensure that the bearings can operate normally during operation, reduce friction and wear, and improve the stability and service life of the equipment, it is necessary to apply a preload to the bearings during installation to adjust the bearing clearance.

[0003] In the related art, the inner ring of the bearing is positioned by the shoulder of the rotating component, and the outer ring is pre-tightened by the bearing cover. However, the installation and positioning of the bearing is inconvenient under this adjustment method. Summary of the invention

[0004] The embodiment of the present application provides a speed reduction mechanism to facilitate the installation and positioning of the bearing, 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 deceleration mechanism is provided, comprising:

[0006] A rotating member that rotates about a rotation axis;

[0007] A bearing, coupled to the rotating member, the bearing comprising an inner ring and an outer ring;

[0008] A pre-tightening member, used for applying a pre-tightening force to the inner ring to adjust the relative position of the inner ring and the outer ring;

[0009] a fastening assembly configured to secure the preload member to the rotating member;

[0010] Wherein, at least a portion of the fastening assembly is embedded in the rotating member, and another portion is embedded in the pre-tightening member, so that the fastening assembly transmits torque between the rotating member and the pre-tightening member.

[0011] Optionally, a projection of the preload element in the axial direction at least partially overlaps with a projection of the inner ring in the axial direction.

[0012] Optionally, the preload member has a force-applying surface, the bearing has a force-bearing surface, and the force-applying surface contacts the force-bearing surface to directly push the inner ring.

[0013] Optionally, the force-applying surface is configured to contact the force-receiving surface at different positions in the circumferential direction.

[0014] Optionally, both the force-applying surface and the force-receiving surface are constructed as an annular structure.

[0015] Optionally, the fastening assembly comprises:

[0016] The adjusting member is threadedly connected to the rotating member so that the adjusting member pushes the preload member to move axially when the adjusting member rotates relative to the rotating member.

[0017] Optionally, a projection of the preload member in the axial direction at least partially overlaps with a projection of the rotating member in the axial direction.

[0018] Optionally, the adjusting member comprises:

[0019] Step part;

[0020] a threaded portion, disposed on one side of the step portion and connected to the rotating member;

[0021] Wherein, the threaded portion passes through the pre-tightening member, and at least a portion of the pre-tightening member is located between the step portion and the rotating member.

[0022] Optionally, the fastening assembly includes a plurality of adjustment members, and the plurality of adjustment members are arranged at different positions in the circumferential direction.

[0023] Optionally, the fastening assembly further comprises:

[0024] An adjusting gasket is arranged between the preload member and the rotating member.

[0025] Optionally, the preload member has a first adjusting thread, and the rotating member has a second adjusting thread matching the first adjusting thread, so that the preload member moves axially when rotating relative to the rotating member.

[0026] Optionally, the fastening assembly comprises:

[0027] A locking member is used for respectively connecting to the preload member and the rotating member to prevent rotation.

[0028] Optionally, the preload member has:

[0029] A plurality of limit grooves are arranged at different circumferential positions;

[0030] The locking member has:

[0031] A plurality of locking parts are respectively arranged on the peripheral sides of the locking member;

[0032] Wherein, at least a portion of the locking portion is embedded in the limiting groove after being bent.

[0033] Optionally, the fastening assembly further comprises:

[0034] A fastener is used to fixedly connect the locking member to the rotating member.

[0035] Optionally, the rotating member has:

[0036] A plurality of connection holes are arranged at different circumferential positions;

[0037] The locking member has:

[0038] A plurality of through holes are arranged at different circumferential positions;

[0039] Wherein, the fastener is connected to the connecting hole after passing through the through hole; the number of the through holes is greater than the number of the fasteners, so that every time the preload member rotates by a preset angle, at least one of the through holes is aligned with the connecting hole.

[0040] Optionally, the deceleration mechanism further includes:

[0041] A reduction housing having a reduction chamber, and the reduction housing is formed with a shifting portion;

[0042] The rotating member is installed in the deceleration chamber through the bearing, the outer ring of the bearing abuts against the shifting portion, and the inner ring of the bearing is sleeved on the rotating member and abuts against the preload member.

[0043] Optionally, the rotating member has or is connected to a stop structure;

[0044] The rotating member is installed in the deceleration chamber through the two bearings, the shifting portion is arranged between the two bearings, and the outer rings of the two bearings are respectively in contact with the shifting portion;

[0045] The inner ring of one of the bearings away from the preload element abuts against the stop structure, and the inner ring of another bearing close to the preload element abuts against the preload element.

[0046] Optionally, the deceleration mechanism further includes:

[0047] An input shaft, configured to rotate when driven by a drive unit;

[0048] The reduction transmission assembly is used to form power transmission between the input shaft and the rotating member.

[0049] According to a second aspect of the present application, a drive axle is provided, comprising the speed reduction mechanism as described above.

[0050] Optionally, the drive axle further includes:

[0051] A drive unit, including a drive housing;

[0052] A transmission shaft, used to transmit power between the drive unit and the wheels;

[0053] A braking device, used for providing braking force to the transmission shaft;

[0054] Wherein, the braking device is connected to the transmission shaft.

[0055] Optionally, the braking device comprises:

[0056] A brake assembly, comprising a friction plate group and a first brake piston;

[0057] a brake seat for accommodating at least a portion of the brake assembly;

[0058] Wherein, the friction plate group is configured to brake the transmission shaft under pressure, and the first brake piston is used to provide or release a first pressure to the friction plate group;

[0059] The brake seat comprises:

[0060] A first base body, comprising a first flange portion and a first guide portion;

[0061] The first flange portion is fixedly connected to the drive housing and / or the reduction housing of the reduction mechanism; and the first guide portion includes a first guide structure for guiding the movement of the first brake piston.

[0062] Optionally, the brake assembly further includes:

[0063] a second brake piston, used for releasing or providing a second pressure to the friction plate group;

[0064] The brake seat comprises:

[0065] The second base includes a second flange portion and a second guide portion;

[0066] The second flange portion is fixedly connected to the drive housing and / or the reduction housing of the reduction mechanism; the second guide portion includes a second guide structure for guiding the movement of the second brake piston.

[0067] Optionally, the first base is fixedly connected to the driving housing, and the second base is connected between the first base and the reduction housing.

[0068] Optionally, the brake assembly further includes:

[0069] A transmission member, used for transmitting the first pressure and / or the second pressure to the friction plate group;

[0070] The transmission element is located between the first brake piston and / or the second brake piston and the friction plate group, and the transmission element is in sliding connection with the second base body.

[0071] Optionally, the braking device comprises:

[0072] A brake assembly, comprising a friction plate group, a first brake piston and a second brake piston;

[0073] A brake seat, used to accommodate the brake assembly;

[0074] Wherein, the friction plate group is configured to brake the transmission shaft under pressure, the first brake piston is used to provide or release a first pressure to the friction plate group, and the second brake piston is used to release or provide a second pressure to the friction plate group;

[0075] The brake seat comprises:

[0076] An outer shell is fixedly connected with the driving shell and the reduction shell of the reduction mechanism;

[0077] a first base body, the first brake piston being in sliding connection with the first base body;

[0078] a second base body, the second brake piston being in sliding connection with the second base body;

[0079] Wherein, the first substrate and the second substrate are both installed in the outer shell.

[0080] Optionally, the braking device comprises:

[0081] A stopper, used for limiting the position of the first substrate and / or the second substrate relative to the outer shell in the axial direction of the transmission shaft in an abutting manner;

[0082] Wherein, the stopper is coupled to the outer shell.

[0083] Optionally, the outer shell has an axial inner wall and a circumferential inner wall; in the axial direction of the transmission shaft, one side of the second base abuts against the axial inner wall, one side of the first base abuts against the other side of the second base, and the other side of the first base abuts against the stopper.

[0084] Optionally, the stopper is configured as an annular structure, and at least a portion of the stopper is embedded in the circumferential inner wall.

[0085] Optionally, the brake assembly further includes:

[0086] A first elastic member, used for relieving or providing the first pressure;

[0087] A stepped bolt is used to mount the first elastic member to the first base.

[0088] Optionally, the brake assembly further includes:

[0089] A second elastic member, used for providing or releasing the second pressure;

[0090] The second elastic member is arranged between the second brake piston and the first base body.

[0091] Optionally, a first piston cavity is formed between the first brake piston and the first substrate, and the first brake piston slides relative to the first substrate when the first piston cavity is filled with oil or drained of oil;

[0092] A second piston chamber is formed between the second brake piston and the second base body, and the second brake piston slides relative to the second base body when the second piston chamber is filled with oil or drained of oil.

[0093] According to a third aspect of the present application, a vehicle is also provided, comprising the reduction mechanism or drive axle as described above.

[0094] The beneficial effect of the present application is that it provides a speed reduction mechanism, a drive axle and a vehicle which apply a preload force to the inner ring through a preload member fixed to a rotating member to facilitate the installation and positioning of the bearing.

[0095] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0096] A preload is applied to the inner ring through the preload member to adjust the relative position of the inner ring and the outer ring, thereby adjusting the bearing clearance. In addition, since the preload member is fixed to the rotating part through the fastening assembly, the fastening assembly transmits torque between the rotating part and the preload member, so that the preload member can rotate synchronously with the rotating part. By adopting such an adjustment structure, the installation and positioning of the bearing is facilitated by integrating the preload member in the rotating part.

[0097] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0098] 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.

[0099] 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.

[0100] Figure 1 is a schematic diagram of the overall structure of a first drive axle provided in an exemplary embodiment of the present application;

[0101] Figure 2 is an internal cross-sectional view of a first drive axle provided in an exemplary embodiment of the present application;

[0102] Figure 3 is an internal cross-sectional view of a first speed reduction mechanism provided in an exemplary embodiment of the present application;

[0103] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0104] Figure 5 It is a perspective view of a portion of a first speed reduction mechanism provided in an exemplary embodiment of the present application;

[0105] Figure 6 yes Figure 2 An internal cross-sectional view of a portion of the first drive axle shown;

[0106] Figure 7 yes Figure 6 A magnified schematic diagram of part B;

[0107] Figure 8 is a schematic diagram of the overall structure of a second drive axle provided in an exemplary embodiment of the present application;

[0108] Fig. 9 is an internal cross-sectional view of a second drive axle provided in an exemplary embodiment of the present application;

[0109] Fig.10 is an internal cross-sectional view of a second speed reduction mechanism provided in an exemplary embodiment of the present application;

[0110] Fig.11 yes Fig.10 A magnified schematic diagram of part C;

[0111] Fig.12 is a perspective view of a portion of a second speed reduction mechanism provided in an exemplary embodiment of the present application;

[0112] Fig.13 yes Fig.12 an internal cross-sectional view of a portion of the second drive axle shown;

[0113] Fig.14 yes Fig.13 Enlarged schematic diagram of part D in the figure.

[0114] Description of reference numerals:

[0115] 100. Speed ​​reduction mechanism;

[0116] 110, rotating part; 111, shaft shoulder;

[0117] 120, bearing; 121, inner ring; 121a, force-bearing surface; 122, outer ring; 123, rolling element;

[0118] 130, preload member; 131, force application surface; 132, limit groove;

[0119] 140, fastening assembly; 141, adjusting member; 141a, step portion; 142, adjusting gasket; 143, locking member; 143a, locking portion; 143b, through hole; 144, fastener;

[0120] 150, reduction housing; 151, reduction chamber; 152, shifting part;

[0121] 160, stopper;

[0122] 170, input shaft; 180, reduction transmission assembly; 181, sun gear; 182, planetary gear; 183, ring gear;

[0123] C1, axis of rotation;

[0124] 10. Drive axle;

[0125] 200, driving unit; 210, motor; 211, driving housing;

[0126] 300, transmission shaft; 400, brake device;

[0127] 400a, brake assembly;

[0128] 410, friction plate group; 411, first friction plate; 412, second friction plate; 413, guide pin; 414, reset member;

[0129] 421, first brake piston; 422, second brake piston; 423, transmission member; 424, first elastic member; 425, step bolt; 426, second elastic member;

[0130] 420a, first piston chamber; 420b, second piston chamber;

[0131] 430, synchronization parts;

[0132] 440, brake seat; 441, first base; 441a, first flange; 441b, first guide;

[0133] 442, a second base; 442a, a second flange portion; 442b, a second guide portion;

[0134] 443, outer shell; 443a, axial inner wall; 443b, circumferential inner wall; 444, stopper. DETAILED DESCRIPTION

[0135] 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.

[0136] According to the first aspect of the present application, referring to Figures 3 to 5 , Figures 10 to 12 The present application provides a speed reduction mechanism 100 , including: a rotating member 110 , a bearing 120 , a pre-tightening member 130 and a fastening assembly 140 .

[0137] The rotating member 110 rotates around a rotation axis C1 ; the bearing 120 is coupled to the rotating member 110 , and the bearing 120 includes an inner ring 121 and an outer ring 122 , and a rolling element 123 is disposed between the outer ring 122 and the inner ring 121 .

[0138] For example, the bearing 120 of the present application may be a tapered bearing 120 , and the bearing 120 and the rotating member 110 are assembled by interference fit or key connection.

[0139] The preload member 130 is used to apply a preload force to the inner ring 121 to adjust the relative position of the inner ring 121 and the outer ring 122 , thereby allowing the bearing 120 to have a suitable working clearance, thereby improving the performance and service life of the bearing 120 .

[0140] The fastening assembly 140 is configured to fix the pre-tightening member 130 to the rotating member 110; at least a portion of the fastening assembly 140 is embedded in the rotating member 110, and another portion is embedded in the pre-tightening member 130, so that the fastening assembly 140 transmits torque between the rotating member 110 and the pre-tightening member 130. It can be understood that, through the provision of the fastening assembly 140, the pre-tightening member 130 and the rotating member 110 rotate synchronously.

[0141] Through the above technical solution, a preload force is applied to the inner ring 121 through the preload member 130 to adjust the relative positions of the inner ring 121 and the outer ring 122, thereby adjusting the clearance of the bearing 120. Moreover, since the preload member 130 is fixed to the rotating member 110 through the fastening assembly 140, the fastening assembly 140 transmits torque between the rotating member 110 and the preload member 130, so that the preload member 130 can rotate synchronously with the rotating member 110. By adopting such an adjustment structure, the installation and positioning of the bearing 120 is facilitated by integrating the preload member 130 in the rotating member 110.

[0142] As an alternative, refer to Figures 3 to 5 , Figures 10 to 12The axial projection of the preload member 130 at least partially overlaps with the axial projection of the inner ring 121. This ensures that there is a sufficient action area between the preload member 130 and the inner ring 121, so that the preload member 130 can stably act on the inner ring 121.

[0143] It can be understood that the axial direction here refers to the extension direction of the above rotation axis C1.

[0144] As an alternative, refer to Figure 4 and Fig.11 The preload member 130 has a force-applying surface 131, and the bearing 120 has a force-bearing surface 121a. The force-applying surface 131 contacts the force-bearing surface 121a to directly push the inner ring 121. With this solution, the preload force is applied by surface contact, and the precise adjustment of the inner ring 121 can be achieved by only ensuring the matching accuracy of the force-applying surface 131 and the force-bearing surface 121a.

[0145] As an alternative, refer to Figures 3 to 5 , Figures 10 to 12 The force-applying surface 131 is configured to contact the force-bearing surface 121a at different positions in the circumferential direction. It can be understood that the circumferential direction here refers to the direction around the above rotation axis C1. The force-applying surface 131 and the force-bearing surface 121a can have multiple contact areas spaced apart in the circumferential direction, or form a continuous annular contact area in the circumferential direction.

[0146] By adopting such a solution, the preload element 130 acts evenly on the bearing 120 in the circumferential direction, so that the bearing 120 maintains the same working clearance in the circumferential direction.

[0147] As a specific solution, refer to Figures 3 to 5 , Figures 10 to 12 The force-applying surface 131 and the force-bearing surface 121a are both constructed as an annular structure.

[0148] As an alternative, refer to Figures 3 to 5 The fastening assembly 140 includes an adjusting member 141. The adjusting member 141 is threadedly connected to the rotating member 110, so that when the adjusting member 141 rotates relative to the rotating member 110, it pushes the pre-tightening member 130 to move in the axial direction.

[0149] In this embodiment, the relative positions of the inner ring 121 and the outer ring 122 are adjusted by threaded connection between the adjusting member 141 and the rotating member 110 by pushing the preload member 130. The adjustment method is simple, and torque transmission between the rotating member 110 and the preload member 130 is achieved through the adjusting member 141.

[0150] As an alternative, refer to Figures 3 to 5, the projection of the pre-tightening member 130 in the axial direction at least partially overlaps with the projection of the rotating member 110 in the axial direction. In this way, the pre-tightening member 130 and the rotating member 110 have a sufficient action area, so that the pre-tightening member 130 can be stably supported on the rotating member 110, and the installation stability of the pre-tightening member 130 is improved, thereby ensuring that a stable force is applied to the inner ring 121.

[0151] As an alternative, refer to Figures 3 to 5 The adjusting member 141 includes a step portion 141a and a threaded portion (not shown).

[0152] The outer diameter of the step portion 141a is larger than the outer diameter of the threaded portion. The threaded portion is arranged on one side of the step portion 141a and is connected to the rotating member 110. It can be understood that the rotating member 110 has a threaded hole (not shown) that is compatible with the threaded portion; the threaded portion passes through the preload member 130, and at least part of the preload member 130 is located between the step portion 141a and the rotating member 110, so that the adjustment member 141 can lock the preload member 130.

[0153] By way of example, the adjusting member 141 may be a screw.

[0154] As an alternative, refer to Figures 3 to 5 The fastening assembly 140 includes a plurality of adjusting members 141, and the plurality of adjusting members 141 are arranged at different positions in the circumferential direction. The arrangement of the plurality of adjusting members 141 ensures that the preload member 130 receives uniform force in the circumferential direction, thereby ensuring that the preload force is uniformly applied to the bearing 120 in the circumferential direction.

[0155] As an alternative, refer to Figures 3 to 5 The fastening assembly 140 further includes an adjusting washer 142 . The adjusting washer 142 is disposed between the pre-tightening member 130 and the rotating member 110 .

[0156] By adopting such a scheme, by adjusting the setting of the gasket 142, not only the contact area between the preload member 130 and the rotating member 110 can be increased, but also when the preload member 130 is adjusted to a different axial position, support can be provided between the preload member 130 and the rotating member 110 to compensate for the axial clearance between the preload member 130 and the rotating member 110, thereby preventing the preload member 130 from tilting under the pressure of the adjusting member 141 and affecting the stable contact between the force-applying surface 131 and the force-bearing surface 121a.

[0157] In some embodiments, reference Fig.10 and Fig.12 The preload member 130 has a first adjusting thread, and the rotating member 110 has a second adjusting thread matching the first adjusting thread, so that the preload member 130 moves axially when rotating relative to the rotating member 110.

[0158] Exemplarily, the first adjustment thread is an internal thread formed on the preload member 130 , and the second adjustment thread is an external thread formed on the preload member 130 .

[0159] In this embodiment, unlike the way in which the adjusting member 141 and the preload member 130 cooperate to adjust the clearance of the bearing 120, the preload member 130 directly cooperates with the second adjustment thread of the rotating member 110 through its first adjustment thread. Rotating the preload member 130 can realize the axial movement of the preload member 130, thereby pushing the inner ring 121 to move to adjust the clearance of the bearing 120.

[0160] As an alternative, refer to Fig.10 and Fig.12 The fastening assembly 140 includes a locking member 143. The locking member 143 is used to be respectively connected to the preload member 130 and the rotating member 110. It can be understood that the locking member 143 can be a stop washer or a latch, etc., which can achieve a rotation-proof connection.

[0161] By adopting such a solution and by setting the locking member 143 , after the clearance of the bearing 120 is adjusted to meet the requirements, the loosening of the preload member 130 can be effectively prevented, thereby improving the stability of the preload member 130 .

[0162] As a specific solution, refer to Fig.10 and Fig.12 The preload member 130 has: a limiting groove 132. A plurality of limiting grooves 132 are provided, and the plurality of limiting grooves 132 are provided at different circumferential positions;

[0163] The locking member 143 has a locking portion 143 a. A plurality of locking portions 143 a are provided, and the plurality of locking portions 143 a are respectively provided on the peripheral side of the locking member 143; at least a portion of the locking portion 143 a is bent and embedded in the limiting groove 132.

[0164] By adopting such a scheme, through the setting of the locking part 143a and the limiting groove 132, after the clearance of the bearing 120 is adjusted to meet the requirements, the locking part 143a is bent into the limiting groove 132, and the locking part 143a and the limiting groove 132 cooperate to realize the anti-rotation connection between the locking member 143 and the preload member 130.

[0165] As a specific solution, refer to Fig.10 and Fig.12 The fastening assembly 140 further includes a fastener 144. The fastener 144 is used to fix the locking member 143 to the rotating member 110.

[0166] By way of example, the fastener 144 may be a screw.

[0167] By adopting such a solution, the locking member 143 and the rotating member 110 are fixedly connected by the setting of the fastener 144 , and the cooperation between the locking portion 143 a and the limiting groove 132 can effectively prevent the preload member 130 from loosening relative to the rotating member 110 .

[0168] As a specific solution, the rotating member 110 has: a connecting hole (not shown), a plurality of connecting holes are provided, and the plurality of connecting holes are provided at different circumferential positions.

[0169] Reference Fig.12 The locking member 143 has a through hole 143b, and a plurality of through holes 143b are provided, and the plurality of through holes 143b are provided at different circumferential positions. The number of through holes 143b is greater than the number of fasteners 144, so that when the preload member 130 rotates a preset angle, at least one through hole 143b is aligned with the connecting hole; and the fastener 144 passes through the through hole 143b and is connected to the connecting hole.

[0170] By adopting such a solution, since the locking member 143 needs to simultaneously satisfy the matching of the locking portion 143a with the limiting groove 132, and the alignment of the through hole 143b with at least one connecting hole, the number of through holes 143b is set to be greater than the number of fasteners 144, ensuring that when the preload member 130 is adjusted to different preload positions, it can be suitable for connection with the preload member 130 and the rotating member 110.

[0171] Exemplarily, 24 through holes 143 b are provided, and 4 fasteners 144 are provided. The preload member 130 can be moved to a preload position every time it rotates 15°, so as to achieve fine adjustment of the clearance of the bearing 120 .

[0172] In some embodiments, reference Figure 3 and Fig.10 The speed reduction mechanism 100 further includes: a speed reduction housing 150 .

[0173] The reduction housing 150 has a reduction chamber 151, and the reduction housing 150 is formed with a shifting portion 152. The rotating member 110 is installed in the reduction chamber 151 through the bearing 120 to achieve the rotational connection between the rotating member 110 and the reduction housing 150; the outer ring 122 of the bearing 120 abuts against the shifting portion 152 to achieve the positioning of the outer ring 122 on the reduction housing; the inner ring 121 of the bearing 120 is sleeved on the rotating member 110 and abuts against the preload member 130.

[0174] By way of example, the rotor 110 is designed as a planet carrier.

[0175] By adopting such a solution, the axial positioning of the bearing 120 is achieved through the cooperation between the stopper 152 and the preload member 130, which facilitates assembly.

[0176] In some embodiments, reference Figure 3 and Fig.10 , the rotating member 110 has or is connected with a stop structure;

[0177] The rotating member 110 is installed in the deceleration chamber 151 through two bearings 120. The shifting portion 152 is arranged between the two bearings 120. The outer rings 122 of the two bearings 120 are respectively in contact with the shifting portion 152.

[0178] The inner ring 121 of one bearing 120 away from the preload member 130 abuts against the stop structure, and the inner ring 121 of another bearing 120 close to the preload member 130 abuts against the preload member 130 .

[0179] For example, refer to Figure 3 , the stop structure may be a shoulder 111 formed on the side wall of the rotating member 110; Fig.10 , or it may be a stopper 160 connected to the rotating member 110 ; or it may include both the shaft shoulder 111 and the stopper 160 .

[0180] By adopting such a solution, the outer rings 122 of the two bearings 120 are positioned simultaneously by using a stop member, and the distance between the preload member 130 and the stop structure is changed by adjusting the position of the preload member 130. At the same time, a preload force is applied to the inner rings 121 of the two bearings 120 to adjust the clearance of the two bearings 120. There is no need to adjust the two bearings 120 separately, and installation and positioning are convenient.

[0181] In some embodiments, reference Figure 3 and Fig.10 The reduction mechanism 100 further includes: an input shaft 170 and a reduction transmission assembly 180 .

[0182] The input shaft 170 is used to rotate under the drive of the driving unit 200 ; the reduction transmission assembly 180 is used to form power transmission between the input shaft 170 and the rotating member 110 .

[0183] It can be understood that the driving unit 200 and the input shaft 170 are decelerated at least once, or the input shaft 170 is directly connected to the driving unit 200 .

[0184] Exemplarily, the drive unit 200 includes a motor 210, and the reduction transmission assembly 180 includes: a sun gear 181 and a planetary gear 182. The sun gear 181 and the planetary gear 182 are both located in the reduction chamber 151; the inner wall of the reduction housing has or is connected to a ring gear 183. The sun gear 181 is integrally formed with the input shaft 170, or is locked with the input shaft 170 by interference fit, spline fit, etc., and the power is input through the input shaft 170, and the sun gear 181 rotates synchronously with the input shaft 170; a plurality of planetary gears 182 are provided, which are spaced and distributed in the circumference of the sun gear 181 and mesh with the sun gear 181 and the ring gear 183 at the same time. The planetary gear 182 is rotatably connected to the rotating member 110 through the planetary shaft, and the planetary shaft is rotatably connected to the housing, and the power is output by the planetary carrier. Among them, the ring gear 183 is formed in the gear portion 152, that is, located between the two bearings 120, and the structure is compact.

[0185] According to a second aspect of the present application, a drive axle 10 is provided, and the drive axle 10 includes the above-mentioned speed reduction mechanism 100. The drive axle 10 has all the beneficial effects of the above-mentioned speed reduction mechanism 100, and the present application will not repeat them here.

[0186] In some embodiments, reference Figure 1 and Figure 2 , Figure 8 and Fig. 9 The drive axle 10 further includes: a drive unit 200 , a transmission shaft 300 and a braking device 400 .

[0187] The driving unit 200 includes a driving housing 211 ; the transmission shaft 300 is used to transmit power between the driving unit 200 and the wheels; and the braking device 400 is connected to the transmission shaft 300 to provide braking force to the transmission shaft 300 .

[0188] It can be understood that the transmission shaft 300 can be a primary shaft or a secondary shaft, wherein the primary shaft can be understood as having a rotation speed similar to or the same as the output shaft of the drive unit 200. For example, the drive unit 200 includes a motor 210, and the primary shaft is fixedly connected to the output shaft of the motor 210. The secondary shaft is at least one stage of reduction relative to the primary shaft. The secondary shaft can also be the input shaft 170 of the above reduction mechanism 100.

[0189] The braking device 400 can realize at least one of a service braking function and a parking braking function.

[0190] Exemplarily, the transmission shaft 300 is a primary shaft connected to the drive unit 200. In this way, the brake device 400 is integrated into the transmission shaft 300, that is, the service brake function and the parking brake function are integrated into the transmission shaft 300, which improves the compactness of the brake device 400 and can improve the braking response speed.

[0191] In some embodiments, the drive unit 200 includes two motors 210, and the two motors 210 are respectively connected to the transmission shaft 300, and drive different wheels respectively through two driving force transmission routes, and the two driving force transmission routes are consistent. In addition, the brake device 400 and the speed reduction mechanism 100 can be installed independently, which is more convenient for maintenance.

[0192] In some embodiments, reference Figure 2 , Figure 6 and Figure 7 The braking device 400 includes: a braking assembly 400a and a braking seat 440.

[0193] The brake assembly 400a includes a friction plate group 410 and a first brake piston 421; the friction plate group 410 is configured to brake the transmission shaft 300 under pressure, and the first brake piston 421 is used to provide or release the first pressure to the friction plate group 410;

[0194] The brake seat 440 is used to accommodate at least a portion of the brake assembly 400 a ; the brake seat 440 includes: a first substrate 441 .

[0195] The first base 441 includes a first flange portion 441a and a first guide portion 441b; the first flange portion 441a is fixedly connected to the drive housing 211 and / or the reduction housing 150 of the reduction mechanism 100; the first guide portion 441b includes a first guide structure for guiding the movement of the first brake piston 421.

[0196] It can be understood that the first flange portion 441a is fixedly connected to one of the driving housing 211 and the reduction housing 150 of the reduction mechanism 100, so that the first base 441 constitutes a part of the overall housing of the brake device 400; or the first flange portion 441a is connected to both the driving housing 211 and the reduction housing 150, so that the first base 441 serves as the overall housing of the brake device 400. The first brake piston 421 can be used to realize a service brake function or a parking brake function, which is not limited.

[0197] Exemplarily, the first guide structure is a stepped hole formed in the first guide portion 441 b.

[0198] With such a solution, the first base body 441 has both the function of guiding the first brake piston 421 and the function of serving as at least a partial housing, thereby facilitating maintenance of the brake device 400 .

[0199] As an alternative, refer to Figure 2 , Figure 6 and Figure 7 The brake assembly 400a further includes a second brake piston 422. The second brake piston 422 is used to release or provide a second pressure to the friction plate group 410.

[0200] The brake seat 440 includes a second base body 442 .

[0201] The second base 442 includes a second flange portion 442a and a second guide portion 442b; the second flange portion 442a is fixedly connected to the drive housing 211 and / or the reduction housing 150 of the reduction mechanism 100; the second guide portion 442b includes a second guide structure for guiding the movement of the second brake piston 422.

[0202] It can be understood that one of the first substrate 441 and the second substrate 442 can constitute the entire outer shell of the braking device 400, or both of them can constitute the entire outer shell of the braking device 400.

[0203] Exemplarily, the first brake piston 421 is used to realize the service brake function, and the second brake piston 422 is used to realize the parking brake function. The second guide structure is a stepped hole formed in the second guide portion 442b.

[0204] As an alternative, refer to Figure 2 , Figure 6 and Figure 7 The first base 441 is fixedly connected to the driving housing 211 , and the second base 442 is connected between the first base 441 and the reduction housing 150 .

[0205] By adopting such a solution, the first base 441 is used for connection with the driving housing 211, and the second base 442 is used for connection with the reduction housing 150, so that the first base 441 and the second base 442 together constitute the overall housing of the brake device 400, thereby eliminating the need to set up an additional housing, thereby reducing manufacturing costs. At the same time, during the assembly process, the first brake piston 421 can be pre-assembled with the first base 441, and the second brake piston 422 can be pre-assembled with the second base 442, and then the first base 441 and the second base 442 are connected to form the entire brake device 400, thereby realizing modular assembly of the brake device 400 and facilitating subsequent disassembly and maintenance.

[0206] As an alternative, refer to Figure 7 The brake assembly 400a further includes: a conductive member 423.

[0207] The conductive member 423 is located between the first brake piston 421 and / or the second brake piston 422 and the friction plate group 410, and the conductive member 423 forms a sliding connection with the second base body 442, for example, supported on the second base body 442 by a guide pin 413; the conductive member 423 is used to transmit the first pressure and / or the second pressure to the friction plate group 410.

[0208] It can be understood that at least one of the first brake piston 421 and the second brake piston 422 acts on the friction plate group 410 through the transmission member 423 .

[0209] By adopting such a solution, through the setting of the transmission member 423, the first pressure and the second pressure can act evenly on the force-bearing side of the friction plate group 410 to provide a braking effect.

[0210] In some embodiments, reference Fig. 9 , Fig.13 and Fig.14 The braking device 400 includes: a braking assembly 400a and a braking seat 440.

[0211] The brake assembly 400a includes a friction plate group 410, a first brake piston 421 and a second brake piston 422; wherein the friction plate group 410 is configured to brake the drive shaft 300 under pressure, the first brake piston 421 is used to provide or release the first pressure to the friction plate group 410, and the second brake piston 422 is used to release or provide the second pressure to the friction plate group 410.

[0212] The brake seat 440 is used to accommodate the brake assembly 400 a ; the brake seat 440 includes an outer shell 443 , a first base 441 and a second base 442 .

[0213] The outer shell 443 is fixedly connected to the driving shell 211 and the reduction shell 150 of the reduction mechanism 100; the first base 441 and the first brake piston 421 are slidably connected to the first base 441; the second base 442 and the second brake piston 422 are slidably connected to the second base 442; wherein the first base 441 and the second base 442 are both installed in the outer shell 443.

[0214] In this embodiment, different from the above embodiment in which the first base 441 and the second base 442 are used as the overall outer shell of the braking device 400, in this embodiment, the first base 441 and the second base 442 are only used to guide the first brake piston 421 and the second brake piston 422, and the outer shell 443 is used as the overall outer shell of the braking device 400, thereby improving the rigidity of the overall outer shell of the braking device 400 and improving the load-bearing capacity when the drive axle 10 is connected to the vehicle mast.

[0215] In some embodiments, reference Fig. 9 , Fig.13 and Fig.14 The braking device 400 includes: a stopper 444 .

[0216] The stopper 444 is coupled to the outer shell 443 to limit the position of the first base 441 and / or the second base 442 relative to the outer shell 443 in the axial direction of the transmission shaft 300 in an abutting manner;

[0217] It can be understood that at least one of the first substrate 441 and the second substrate 442 cooperates with the stopper 444 .

[0218] By disposing the stopper 444 , the positions of the first base body 441 and the second base body 442 on the outer shell 443 are limited, thereby ensuring that the first brake piston 421 and the second brake piston 422 can be stably supported.

[0219] In some embodiments, reference Fig. 9 , Fig.13 and Fig.14 The outer shell 443 has an axial inner wall 443a and a circumferential inner wall 443b; in the axial direction of the transmission shaft 300, one side of the second base 442 abuts against the axial inner wall 443a, one side of the first base 441 abuts against the other side of the second base 442, and the other side of the first base 441 abuts against the stopper 444.

[0220] By adopting such a solution, by combining the structural design of the outer shell 443 and the abutment cooperation between the first substrate 441 and the second substrate 442, the first substrate 441 and the second substrate 442 can be installed by only one stopper 444, thereby improving the convenience of assembly.

[0221] In some embodiments, reference Fig.13 and Fig.14 The stopper 444 is constructed as an annular structure, and at least a portion of the stopper 444 is embedded in the circumferential inner wall 443b.

[0222] By adopting such a stopper 444 structure, it is only necessary to set a groove that cooperates with the stopper 444 on the inner wall 443b of the peripheral side of the outer shell 443 to achieve the installation of the first substrate 441 and the second substrate 442. While simplifying the installation method, it ensures the structural rigidity of the outer shell 443 and improves the load-bearing capacity of the drive axle 10.

[0223] In some embodiments, reference Figure 6 and Figure 7 , Fig.13 and Fig.14 The brake assembly 400 a further includes: a first elastic member 424 and a step bolt 425 .

[0224] The first elastic member 424 is used to release or provide the first pressure; the step bolt 425 is used to install the first elastic member 424 to the first base 441 .

[0225] It can be understood that one of the first brake piston 421 and the first elastic member 424 provides the first pressure to the friction plate group 410 so that the friction plate group 410 generates a driving braking force, and the other is used to release the first pressure. The first elastic member 424 is sleeved on the step bolt 425 to maintain the shape stability of the first elastic member 424. The step bolt 425 passes through the first brake piston 421 and is fixedly connected to the first base 441.

[0226] Exemplarily, the first elastic member 424 is a compression spring, and the first elastic member 424 is disposed on a side of the first brake piston 421 close to the friction plate group 410. The first pressure is provided by the first brake piston 421, and the first elastic member 424 biases the first brake piston 421, so that the first brake piston 421 has a tendency to move away from the friction plate group 410.

[0227] In some embodiments, reference Figure 6 and Figure 7 , Fig.13 and Fig.14 The brake assembly 400a also includes: a second elastic member 426.

[0228] The second elastic member 426 is disposed between the second brake piston 422 and the first base body 441 for providing or releasing the second pressure.

[0229] It can be understood that one of the second brake piston 422 and the second elastic member 426 provides the second pressure to the friction plate group 410 so that the friction plate group 410 generates a parking braking force, and the other is used to release the second pressure.

[0230] Exemplarily, the second elastic member 426 is a compression spring, and the second elastic member 426 is disposed on a side of the second brake piston 422 away from the friction plate group 410, and the first pressure is provided by the second elastic member 426, and the first pressure acts on the friction plate group 410 through the second brake piston 422. Specifically, one end of the second elastic member 426 abuts against the second brake piston 422, and the other end abuts against the first substrate 441.

[0231] With the above braking solution, the first brake piston 421 and the second brake piston 422 act on the same friction plate group 410 , thereby reducing the number of friction plate groups 410 .

[0232] In some embodiments, reference Figure 6 and Figure 7 , Fig.13 and Fig.14 A first piston chamber 420 a is formed between the first brake piston 421 and the first base 441 , and the first brake piston 421 slides relative to the first base 441 when the first piston chamber 420 a is filled with oil or drained with oil.

[0233] When the first piston chamber 420a is filled with oil, the first brake piston 421 provides a first pressure under the action of the hydraulic oil, compresses the first elastic member 424 and presses the friction plate group 410, thereby achieving a service brake effect. When the first piston chamber 420a is drained of oil, the pressure of the hydraulic oil in the first piston chamber 420a is released, and the first brake piston 421 moves away from the friction plate group 410 under the elastic action of the first elastic member 424, and finally releases the service brake.

[0234] A second piston chamber 420 b is formed between the second brake piston 422 and the second base 442 , and the second brake piston 422 slides relative to the second base 442 when the second piston chamber 420 b is filled with oil or drained of oil.

[0235] When the second piston chamber 420b leaks oil, the second brake piston 422 moves toward the friction plate group 410 under the action of the second pressure provided by the second elastic member 426. As the hydraulic oil is continuously released, the second brake piston 422 presses the friction plate group 410 to generate a parking braking force, thereby achieving a parking brake effect.

[0236] When the second piston chamber 420b is filled with oil, the second brake piston 422 moves away from the friction plate group 410 under the pressure of the hydraulic oil. As the second elastic member 426 is continuously compressed, the pressure of the second brake piston 422 on the friction plate group 410 continues to decrease, and the parking position is finally released.

[0237] In some embodiments, reference Figure 6 and Figure 7 , Fig.13 and Fig.14 The friction plate group 410 includes a first friction plate 411 and a second friction plate 412. The plurality of first friction plates 411 are respectively connected to the brake seat 440 for rotation prevention and are axially slidable relative to the brake seat 440; the plurality of second friction plates 412 are respectively connected to the transmission shaft 300 for rotation prevention and are axially slidable relative to the transmission shaft 300; the first friction plates 411 and the second friction plates 412 are configured to brake the transmission shaft 300 by friction force.

[0238] In some embodiments, reference Figure 6 to Figure 7The friction plate group 410 further includes: a guide pin 413 and a reset member 414. A plurality of first friction plates 411 are connected in series by the guide pin 413, one end of the guide pin 413 is inserted in the outer shell 443, and the other end is inserted in the second base 442. The guide pin 413 is provided to guide the sliding of the first friction plate 411, and at the same time, the first friction plate 411 is connected to the brake seat 440 to prevent rotation. The reset member 414 is provided between adjacent first friction plates 411. Through the setting of the reset member 414, when the pressure on the friction plate group 410 is released, the reset member 414 can separate the first friction plate 411 and the second friction plate 412 to prevent the friction plate from sliding.

[0239] The second friction plate 412 is anti-rotationally engaged with the transmission shaft 300 via a synchronous member 430 , and the synchronous member 430 may be a spline sleeve.

[0240] Optionally, the first friction plate 411 is a steel plate, and the material of the first friction plate 411 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.

[0241] Exemplarily, the reset member 414 is a compression spring, and the reset member 414 is sleeved on the guide pin 413 .

[0242] This application exemplarily describes the working process of the braking device 400:

[0243] When service braking is required, hydraulic oil enters the first piston chamber 420a. As the hydraulic pressure of the first piston chamber 420a continues to increase, the first brake piston 421 overcomes the elastic force of the first elastic member 424 and presses the friction plate group 410 to achieve service braking.

[0244] When the service brake needs to be released, the hydraulic pressure in the first piston chamber 420a is released, and the first brake piston 421 moves away from the friction plate group 410 under the action of the first elastic member 424. At this time, the friction plates are separated and the service brake is released.

[0245] When parking brake is required, the hydraulic oil in the second piston chamber 420b is discharged, and under the action of the second elastic member, the second brake piston 422 will press the friction plate group 410 to achieve parking brake.

[0246] When the parking brake needs to be released, the hydraulic oil enters the second piston chamber 420b. After being subjected to the hydraulic pressure, the second piston chamber 420b pushes the second brake piston 422 to move in the direction of compressing the second elastic member. As the hydraulic oil continues to enter, the second pressure applied by the second elastic member is released. At this time, the friction plates are separated and the parking brake is released.

[0247] According to a third aspect of the present application, a vehicle is provided, which includes the above-mentioned reduction mechanism 100 or drive axle 10. The vehicle has all the beneficial effects of the above-mentioned reduction mechanism 100 or drive axle 10, which will not be described in detail in the present application.

[0248] Exemplarily, the vehicle may be a forklift, and the present application may meet the driving and braking requirements of the forklift.

[0249] 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.

[0250] 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.

[0251] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0252] 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 speed reduction mechanism, characterized in that: include: A rotating member that rotates about a rotation axis; A bearing, coupled to the rotating member, the bearing comprising an inner ring and an outer ring; A pre-tightening member, used for applying a pre-tightening force to the inner ring to adjust the relative position of the inner ring and the outer ring; a fastening assembly configured to secure the preload member to the rotating member; Wherein, at least a portion of the fastening assembly is embedded in the rotating member, and another portion is embedded in the pre-tightening member, so that the fastening assembly transmits torque between the rotating member and the pre-tightening member.

2. The speed reduction mechanism according to claim 1, characterized in that: The projection of the preload element in the axial direction at least partially overlaps with the projection of the inner ring in the axial direction.

3. The speed reduction mechanism according to claim 2, characterized in that: The preload member has a force-applying surface, and the bearing has a force-bearing surface. The force-applying surface contacts the force-bearing surface to directly push the inner ring.

4. The speed reduction mechanism according to claim 3, characterized in that: The force applying surface is configured to contact the force receiving surface at different positions in the circumferential direction.

5. The speed reduction mechanism according to claim 4, characterized in that: The force-applying surface and the force-receiving surface are both constructed as an annular structure.

6. The speed reduction mechanism according to any one of claims 1 to 5, characterized in that: The fastening assembly comprises: The adjusting member is threadedly connected to the rotating member so that the adjusting member pushes the preload member to move axially when the adjusting member rotates relative to the rotating member.

7. The speed reduction mechanism according to claim 6, characterized in that: The projection of the preload element in the axial direction at least partially overlaps with the projection of the rotating element in the axial direction.

8. The speed reduction mechanism according to claim 7, characterized in that: The adjusting member comprises: Step part; a threaded portion, disposed on one side of the step portion and connected to the rotating member; Wherein, the threaded portion passes through the pre-tightening member, and at least a portion of the pre-tightening member is located between the step portion and the rotating member.

9. The speed reduction mechanism according to claim 6, characterized in that: The fastening assembly includes a plurality of adjusting pieces, and the plurality of adjusting pieces are arranged at different positions in the circumferential direction.

10. The speed reduction mechanism according to claim 6, characterized in that: The fastening assembly further comprises: An adjusting gasket is arranged between the preload member and the rotating member.

11. The speed reduction mechanism according to claim 1, characterized in that: The preload member has a first adjusting thread, and the rotating member has a second adjusting thread matched with the first adjusting thread, so that the preload member moves axially when rotating relative to the rotating member.

12. The speed reduction mechanism according to claim 11, characterized in that: The fastening assembly comprises: A locking member is used for respectively connecting to the preload member and the rotating member to prevent rotation.

13. The speed reduction mechanism according to claim 12, characterized in that: The preloaded member has: A plurality of limit grooves are arranged at different circumferential positions; The locking member has: A plurality of locking parts are respectively arranged on the peripheral sides of the locking member; Wherein, at least a portion of the locking portion is embedded in the limiting groove after being bent.

14. The speed reduction mechanism according to claim 13, characterized in that: The fastening assembly further comprises: A fastener is used to fixedly connect the locking member to the rotating member.

15. The speed reduction mechanism according to claim 14, characterized in that: The rotating member has: A plurality of connection holes are arranged at different circumferential positions; The locking member has: A plurality of through holes are arranged at different circumferential positions; Wherein, the fastener is connected to the connecting hole after passing through the through hole; the number of the through holes is greater than the number of the fasteners, so that every time the preload member rotates by a preset angle, at least one of the through holes is aligned with the connecting hole.

16. The speed reduction mechanism according to any one of claims 1 to 5, characterized in that: The deceleration mechanism further comprises: A reduction housing having a reduction chamber, and the reduction housing is formed with a shifting portion; The rotating member is installed in the deceleration chamber through the bearing, the outer ring of the bearing abuts against the shifting portion, and the inner ring of the bearing is sleeved on the rotating member and abuts against the preload member.

17. The speed reduction mechanism according to claim 16, characterized in that: The rotating member has or is connected with a stop structure; The rotating member is installed in the deceleration chamber through the two bearings, the shifting portion is arranged between the two bearings, and the outer rings of the two bearings are respectively in contact with the shifting portion; The inner ring of one of the bearings away from the preload element abuts against the stop structure, and the inner ring of another bearing close to the preload element abuts against the preload element.

18. The speed reduction mechanism according to any one of claims 1 to 5, characterized in that: The deceleration mechanism further comprises: An input shaft, configured to rotate when driven by a drive unit; The reduction transmission assembly is used to form power transmission between the input shaft and the rotating member.

19. A drive axle, characterized in that: It comprises a speed reduction mechanism as claimed in any one of claims 1 to 18.

20. The drive axle according to claim 19, characterized in that: The drive axle further comprises: A drive unit, including a drive housing; A transmission shaft, used to transmit power between the drive unit and the wheels; A braking device, used for providing braking force to the transmission shaft; Wherein, the braking device is connected to the transmission shaft.

21. The drive axle according to claim 20, characterized in that: The braking device comprises: A brake assembly, comprising a friction plate group and a first brake piston; a brake seat for accommodating at least a portion of the brake assembly; Wherein, the friction plate group is configured to brake the transmission shaft under pressure, and the first brake piston is used to provide or release a first pressure to the friction plate group; The brake seat comprises: A first base body, comprising a first flange portion and a first guide portion; The first flange portion is fixedly connected to the drive housing and / or the reduction housing of the reduction mechanism; and the first guide portion includes a first guide structure for guiding the movement of the first brake piston.

22. The drive axle according to claim 21, characterized in that: The brake assembly also includes: a second brake piston, used for releasing or providing a second pressure to the friction plate group; The brake seat comprises: The second base includes a second flange portion and a second guide portion; The second flange portion is fixedly connected to the drive housing and / or the reduction housing of the reduction mechanism; the second guide portion includes a second guide structure for guiding the movement of the second brake piston.

23. The drive axle according to claim 22, characterized in that: The first base is fixedly connected to the driving housing, and the second base is connected between the first base and the reduction housing.

24. The drive axle according to claim 22, characterized in that: The brake assembly also includes: A transmission member, used for transmitting the first pressure and / or the second pressure to the friction plate group; The transmission element is located between the first brake piston and / or the second brake piston and the friction plate group, and the transmission element is in sliding connection with the second base body.

25. The drive axle according to claim 20, characterized in that: The braking device comprises: A brake assembly, comprising a friction plate group, a first brake piston and a second brake piston; A brake seat, used to accommodate the brake assembly; Wherein, the friction plate group is configured to brake the transmission shaft under pressure, the first brake piston is used to provide or release a first pressure to the friction plate group, and the second brake piston is used to release or provide a second pressure to the friction plate group; The brake seat comprises: An outer shell is fixedly connected with the driving shell and the reduction shell of the reduction mechanism; a first base body, the first brake piston being in sliding connection with the first base body; a second base body, the second brake piston being in sliding connection with the second base body; Wherein, the first substrate and the second substrate are both installed in the outer shell.

26. The drive axle according to claim 25, characterized in that: The braking device comprises: A stopper, used for limiting the position of the first substrate and / or the second substrate relative to the outer shell in the axial direction of the transmission shaft in an abutting manner; Wherein, the stopper is coupled to the outer shell.

27. The drive axle according to claim 26, characterized in that: The outer shell has an axial inner wall and a circumferential inner wall; in the axial direction of the transmission shaft, one side of the second base abuts against the axial inner wall, one side of the first base abuts against the other side of the second base, and the other side of the first base abuts against the stopper.

28. The drive axle according to claim 27, characterized in that: The stopper is configured as an annular structure, and at least a portion of the stopper is embedded in the circumferential inner wall.

29. The drive axle according to any one of claims 21 to 28, characterized in that: The brake assembly also includes: A first elastic member, used for relieving or providing the first pressure; A stepped bolt is used to mount the first elastic member to the first base.

30. The drive axle according to any one of claims 22 to 28, characterized in that: The brake assembly also includes: A second elastic member, used for providing or releasing the second pressure; The second elastic member is arranged between the second brake piston and the first base body.

31. The drive axle according to any one of claims 22 to 28, characterized in that: A first piston cavity is formed between the first brake piston and the first substrate, and the first brake piston slides relative to the first substrate when the first piston cavity is filled with oil or drained of oil; A second piston chamber is formed between the second brake piston and the second base body, and the second brake piston slides relative to the second base body when the second piston chamber is filled with oil or drained of oil.

32. A vehicle, characterized in that: It comprises the reduction mechanism as described in any one of claims 1 to 18 or the drive axle as described in any one of claims 19 to 31.

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