Reduction gearbox, motor assembly, electric pedal device and vehicle

Abstract

The utility model discloses a reduction gearbox, a motor assembly, an electric pedal device and a vehicle. The reduction gearbox comprises a box body, a worm and gear assembly and a locking piece, the box body is provided with a first cavity, the first cavity comprises a first sub-cavity, a second sub-cavity and a third sub-cavity which are communicated with one another, a third opening is formed in one end of the first sub-cavity, internal threads are arranged on the inner wall of the first sub-cavity, and the worm and gear assembly is contained in the first cavity; the worm and gear assembly comprises a second bearing, a first worm gear and a first worm which are located on the same axis, the second bearing is contained in the first sub-cavity, the first worm gear is contained in the second sub-cavity, the first worm is contained in the third sub-cavity, and the locking piece is in threaded connection with the internal threads through the external threads on the peripheral side of the locking piece, so that the second bearing is fixed to the first sub-cavity; the locking piece can be screwed to the end face of the locking piece and is flush with the plane where the third opening is located. In this way, the reduction gearbox does not affect the trafficability of the vehicle with the chassis provided with the electric pedal device.

Description

Technical Field

[0001] This application relates to the field of automotive parts, and particularly to a speed reducer, a motor assembly, an electric pedal device, and a vehicle. Background Art

[0002] In order to assist the driver and passengers to enter and exit the vehicle cabin conveniently, a pedal device is usually installed on the chassis. The pedal device generally includes a fixed pedal device and an electric pedal device. The electric pedal device is popular among users because it can automatically extend when the door is opened to assist the driver and passengers to enter and exit the vehicle cabin conveniently, and can automatically retract when the door is closed to ensure the vehicle's passing performance and aesthetic appearance. However, the motor assembly in the existing electric pedal device will affect the passing performance of the vehicle, thus affecting the user experience. Summary of the Utility Model

[0003] A speed reducer, a motor assembly, an electric pedal device, and a vehicle provided by this application can solve the problem that the motor assembly in the existing electric pedal device affects the passing performance of the vehicle.

[0004] To solve the above technical problems, a technical solution adopted by this application is: to provide a speed reducer, the speed reducer includes: a box body provided with a first cavity, the first cavity includes a first sub-cavity, a second sub-cavity, and a third sub-cavity that communicate with each other, a third opening is provided at one end of the first sub-cavity away from the second sub-cavity, and an internal thread is provided on the inner wall of the first sub-cavity at one end away from the second sub-cavity; a worm and worm gear assembly accommodated in the first cavity, the worm and worm gear assembly includes a second bearing, a first worm gear, and a first worm on the same axis, the second bearing is accommodated in the first sub-cavity, the first worm gear is accommodated in the second sub-cavity, and the first worm is accommodated in the third sub-cavity; a locking member, an external thread is provided on the circumferential side of the locking member, and the locking member is screwed to the internal thread so that the second bearing is fixed in the first sub-cavity; wherein, the locking member can be screwed until the end surface of the locking member is flush with the plane where the third opening is located.

[0005] In one embodiment, the end surface of the locking member is recessed toward the first sub-cavity to form a plurality of first hollow structures.

[0006] In one embodiment, the end surface of the locking member is recessed toward the first sub-cavity to form a tightening and loosening adjustment structure.

[0007] In one embodiment, the tightening and loosening adjustment structure includes a positioning hole and a plurality of grooves evenly distributed around the positioning hole.

[0008] In one embodiment, the material of the locking member is engineering plastic.

[0009] In one embodiment, a second annular groove is provided on the circumferential side of the locking member between the end face and the external thread. The reduction gearbox further includes a second sealing ring, and the second sealing ring is disposed in the annular groove and abuts against the inner wall of the first sub-cavity.

[0010] In one embodiment, the distance between the end face of the locking member and the plane where the third opening is located is less than or equal to 1 mm.

[0011] In one embodiment, a shoulder is provided at the connection between the first sub-cavity and the second sub-cavity, and the outer ring of the second bearing abuts between the shoulder and the locking member.

[0012] In one embodiment, the reduction gearbox further includes a second cavity and a third cavity. The second cavity communicates with the second sub-cavity, and the third cavity communicates with the third sub-cavity.

[0013] Another technical solution adopted by this application is: to provide a motor assembly, which includes: a motor; a reduction gearbox, the input end of the reduction gearbox is drivingly connected to the output end of the motor; an output shaft assembly, which is drivingly connected to the output end of the reduction gearbox; wherein, the reduction gearbox is the reduction gearbox described in any one of the above.

[0014] Another technical solution adopted by this application is: to provide an electric pedal device, which includes a motor assembly, and the motor assembly includes a reduction gearbox. When the electric pedal device is fixed to the chassis of a vehicle, the end face of the locking member of the reduction gearbox faces the ground.

[0015] Another technical solution adopted by this application is: to provide a vehicle, which includes the above-mentioned electric pedal device.

[0016] The beneficial effects of the present application are as follows: Different from the prior art, the speed reducer provided by the present application includes: a box body provided with a first cavity, the first cavity includes a first sub-cavity, a second sub-cavity and a third sub-cavity that communicate with each other, a third opening is provided at one end of the first sub-cavity away from the second sub-cavity, and an internal thread is provided on the inner wall of the first sub-cavity at one end away from the second sub-cavity; a worm and worm gear assembly accommodated in the first cavity, the worm and worm gear assembly includes a second bearing, a first worm wheel and a first worm on the same axis, the second bearing is accommodated in the first sub-cavity, the first worm wheel is accommodated in the second sub-cavity, and the first worm is accommodated in the third sub-cavity; a locking member, an external thread is provided on the circumferential side of the locking member, and the locking member is screwed to the internal thread so that the second bearing is fixed in the first sub-cavity; wherein, the locking member can be screwed until the end face of the locking member is flush with the plane where the third opening is located. In this way, the speed reducer will not affect the passing performance of a vehicle with an electric pedal device installed on the chassis. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0019] Figure 2 is a schematic structural diagram of an electric pedal device provided by some embodiments of the present application;

[0020] Figure 3 is a schematic structural diagram of a motor assembly provided by some embodiments of the present application;

[0021] Figure 4 is an exploded schematic diagram of a motor assembly provided by some embodiments of the present application;

[0022] Figure 5 is a schematic structural diagram of a box body in a first perspective provided by some embodiments of the present application;

[0023] Figure 6 is a schematic structural diagram of a box body in a second perspective provided by some embodiments of the present application;

[0024] Figure 7 is a schematic structural diagram of a locking snap ring provided by some embodiments of the present application;

[0025] Figure 8It is a schematic structural diagram of a locking member provided in some embodiments of the present application from a first perspective;

[0026] Figure 9 It is a schematic structural diagram of a locking member provided in some embodiments of the present application from a second perspective;

[0027] Figure 10 It is a schematic structural diagram of a housing assembly provided in some embodiments of the present application;

[0028] Figure 11 It is a schematic structural diagram of an armature rotor assembly provided in some embodiments of the present application;

[0029] Figure 12 It is a schematic structural diagram of a worm and worm gear assembly provided in some embodiments of the present application;

[0030] Figure 13 It is a schematic structural diagram of an output shaft assembly provided in some embodiments of the present application;

[0031] Figure 14 It is a schematic structural diagram of an end cover provided in some embodiments of the present application.

[0032] Description of reference numerals: 10000 - vehicle, 1000 - electric pedal device, 100 - motor assembly, 110 - box body, 111 - first cavity, 1111 - first sub - cavity, 1111a - third opening, 1111b - internal thread, 1112 - second sub - cavity, 1112a - shoulder, 1113 - third sub - cavity, 1114 - third mounting seat, 1115 - fourth mounting seat, 112 - second cavity, 1121 - first joint, 1121a - first opening, 1121b - first annular groove, 1122 - main body part, 1122a - mounting edge, 1122b - step structure, 1122c - wire outlet structure, 1122d - reinforcing rib, 1123 - second mounting seat, 1124 - fourth sub - cavity, 1124a - second hollow structure, 1125 - fifth sub - cavity, 1126 - circuit board assembly, 113 - third cavity, 1131 - fifth mounting seat, 1132 - second opening, 114 - end cover, 1141 - support hole, 1142 - second joint, 1143 - mounting part, 1144 - third annular groove, 115 - locking part, 1151 - external thread, 1152 - first hollow structure, 1153 - tension adjustment structure, 1153a - positioning hole, 1153b - groove, 1154 - second annular groove, 120 - housing assembly, 121 - motor housing, 1211 - first mounting seat, 130 - armature rotor assembly, 131 - second worm, 132 - armature shaft, 140 - worm and worm gear assembly, 141 - second bearing, 142 - first worm gear, 143 - first worm, 144 - locking snap ring, 1441 - concave - convex structure, 150 - output shaft assembly, 151 - second worm gear, 161 - first sealing ring, 162 - second sealing ring, 163 - third sealing ring, 171 - elastic adjustment part, 172 - shim for clearance adjustment, 180 - first bearing, 191 - first bushing, 192 - second bushing, 193 - third bushing, 200 - mounting bracket, 300 - swing arm assembly, 400 - pedal assembly, 101 - reduction box, 102 - intermediate transmission assembly, 103 - motor. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. In addition, it should be noted that for the convenience of description, only parts related to the present application are shown in the drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0034] The terms "first", "second", and "third" in this application are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", and "third" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0035] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] The speed reducer provided in this application includes: a box body provided with a first cavity, the first cavity including a first sub-cavity, a second sub-cavity, and a third sub-cavity that communicate with each other. A third opening is provided at one end of the first sub-cavity away from the second sub-cavity, and an internal thread is provided on the inner wall of the first sub-cavity at one end away from the second sub-cavity; a worm and worm gear assembly accommodated in the first cavity, the worm and worm gear assembly including a second bearing, a first worm gear, and a first worm located on the same axis. The second bearing is accommodated in the first sub-cavity, the first worm gear is accommodated in the second sub-cavity, and the first worm is accommodated in the third sub-cavity; a locking member, an external thread is provided on the circumferential side of the locking member, and the locking member is screwed to the internal thread so that the second bearing is fixed in the first sub-cavity; wherein, the locking member can be screwed until the end face of the locking member is flush with the plane where the third opening is located. In this way, the speed reducer will not affect the passing performance of a vehicle with an electric pedal device installed on the chassis.

[0037] Please refer to Figure 1 , Figure 1The following is a schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 10000 provided by the present application may include, but is not limited to, an electric pedal device 1000. The electric pedal device 1000 is used to assist the driver and passengers in getting in and out of the vehicle cabin conveniently. Among them, the electric pedal device 1000 can minimize the impact on the passability of the vehicle 10000, thereby improving the user experience.

[0038] Please refer to Figure 2 , Figure 2 The following is a schematic structural diagram of an electric pedal device provided by some embodiments of the present application. The electric pedal device 1000 provided by the present application may include, but is not limited to, a motor assembly 100, a mounting bracket 200, a swing arm assembly 300, and a pedal assembly 400. The motor assembly 100 is fixed to the mounting bracket 200. The motor assembly 100 is in transmission connection with the swing arm assembly 300. The swing arm assembly 300 is in transmission connection with the pedal assembly 400. Driven by the motor assembly 100, the pedal assembly 400 can extend and / or retract relative to the body of the vehicle 1000. The electric pedal device 1000 can prevent the motor assembly 100 from affecting the passability of the vehicle 10000 equipped with the electric pedal device 1000. Among them, when the electric pedal device 1000 is fixed to the chassis of the vehicle 10000, the distance between the motor assembly 100 and the horizontal ground is greater than the distance between the pedal assembly 400 and the horizontal ground.

[0039] Please refer to in combination with Figures 2 - 4 , Figure 3 The following is a schematic structural diagram of the motor assembly 100 provided by some embodiments of the present application, Figure 4 The following is an exploded schematic diagram of the motor assembly 100 provided by some embodiments of the present application. The motor assembly 100 provided by the present application may include, but is not limited to, a box body 110, a housing assembly 120, an armature rotor assembly 130, a worm and worm gear assembly 140, an output shaft assembly 150, and at least one elastic adjusting member 171. The box body 110 is fixedly connected to the housing assembly 120. The armature rotor assembly 130 is disposed within the space formed by enclosing the housing assembly 120 and the box body 110 assembly. The worm and worm gear assembly 140 is disposed within the box body 110 and meshes with the armature rotor assembly 130 to achieve transmission connection. A partial structure of the output shaft assembly 150 is disposed within the box body 110 and meshes with the worm and worm gear assembly 140 to achieve transmission connection. Among them, a mounting position is provided on the box body 110 for fixedly connecting to the mounting bracket 200 of the electric pedal device 1000. The output shaft assembly 150 is in transmission connection with the swing arm assembly of the electric pedal device 1000 to drive the swing arm assembly to drive the pedal assembly to extend and / or retract relative to the body of the vehicle 10000.

[0040] In this embodiment, the worm and worm gear assembly 140 serves as the intermediate transmission assembly 102, enabling the power of the armature rotor assembly 130 to be transmitted to the output shaft assembly 150. The elastic adjusting member 171 is used to automatically adjust the meshing clearance between the armature rotor assembly 130 and the intermediate transmission assembly 102, and / or between the intermediate transmission assembly 102 and the output shaft assembly 150.

[0041] It can be understood that after the motor assembly 100 has been used for a period of time, the meshing clearance between the armature rotor assembly 130 and the intermediate transmission assembly 102 and / or the meshing clearance between the intermediate transmission assembly 102 and the output shaft assembly 150 will increase due to wear. At this time, the elastic adjusting member 171 in the preloaded state will, under the action of its own restoring force, cause the above-mentioned meshing clearance to return to the normal state, thereby avoiding a reduction in transmission efficiency and abnormal noise caused by an excessive clearance.

[0042] Optionally, the elastic adjusting member 171 can be a wave spring. The wave spring has the advantages of small volume, light weight, long service life, and saving axial space.

[0043] In this embodiment, the diameter of the housing assembly 120 is 60 - 65 mm, making the motor assembly 100 appear more lightweight and compact.

[0044] Please refer to Figures 2 - 6 , Figure 5 which is a schematic structural diagram of the box body 110 provided by some embodiments of the present application, Figure 6 and which is a schematic structural diagram of the locking snap ring 144 provided by some embodiments of the present application. The box body 110 provided by the present application has a compact structure, light weight, low production cost, and can achieve good sealing at each opening. The box body 110 may include, but is not limited to, a first cavity 111, a second cavity 112, and a third cavity 113. The first cavity 111 is connected to the second cavity 112 and is in communication at their connection. The first cavity 111 is connected to the third cavity 113 and is in communication at their connection. The worm and worm gear assembly 140 is accommodated in the first cavity 111. The armature rotor assembly 130 is accommodated in the space surrounded by the housing assembly 120 and the second cavity 112. A partial structure of the output shaft assembly 150 is accommodated in the third cavity 113. At the communication between the first cavity 111 and the second cavity 112, the armature rotor assembly 130 is in transmission connection with the worm and worm gear assembly 140. At the communication between the first cavity 111 and the third cavity 113, the worm and worm gear assembly 140 is in transmission connection with the output shaft assembly 150.

[0045] Further, the first cavity 111 may include, but is not limited to, a first sub-cavity 1111, a second sub-cavity 1112, and a third sub-cavity 1113 that are interconnected and arranged in sequence. The second sub-cavity 1112 communicates with the second cavity 112. The third sub-cavity 1113 communicates with the third cavity 113. One end of the first sub-cavity 1111 away from the second sub-cavity 1112 is provided with a third opening 1111a. The inner wall of the first sub-cavity 1111 at the end away from the second sub-cavity 1112 is provided with an internal thread 1111b. A shoulder 1112a is provided at the connection between the first sub-cavity 1111 and the second sub-cavity 1112. The motor assembly 100 further includes a locking member 115. The outer circumference of the locking member 115 is provided with an external thread 1151. The external thread 1151 of the locking member 115 is screwed with the internal thread 1111b of the first sub-cavity 1111. Wherein, the locking member 115 can be screwed until the end face of the locking member 115 is flush with the plane where the third opening 1111a of the first sub-cavity 1111 is located. In some embodiments, the distance between the end face of the locking member 115 and the plane where the third opening 1111a is located is less than or equal to 1 mm.

[0046] In this embodiment, when the electric pedal device 1000 is fixed to the chassis of the vehicle 10000, the end face of the locking member 115 of the motor assembly 100 faces the ground.

[0047] It can be understood that since the end face of the locking member 115 of the motor assembly 100 faces the ground when the electric pedal device 1000 is fixed to the chassis of the vehicle 10000, therefore, by screwing the locking member 115 until its end face is almost flush with the plane where the third opening 1111a of the first sub-cavity 1111 is located, it is possible to effectively avoid the motor assembly 100 from affecting the passability of the vehicle 10000 equipped with the electric pedal device 1000, thereby improving the user experience.

[0048] Further, the first cavity 111 further includes opposite third mounting seats 1114 and fourth mounting seats 1115. Wherein, the third mounting seat 1114 is connected to one end of the third sub-cavity 1113 away from the second sub-cavity 1112. In some embodiments, the fourth mounting seat 1115 may be constituted by the first sub-cavity 1111. In other embodiments, the fourth mounting seat 1115 may be jointly constituted by the first sub-cavity 1111 and the locking member 115. One end of the intermediate transmission assembly 102 is disposed on the third mounting seat 1114. The other end of the intermediate transmission assembly 102 is disposed on the fourth mounting seat 1115. Wherein, the elastic adjustment member 171 is disposed between the third mounting seat 1114 and the intermediate transmission assembly 102 and / or between the fourth mounting seat 1115 and the intermediate transmission assembly 102.

[0049] Further, the motor assembly 100 further includes a first bearing 180 and a second bearing 141. The first bearing 180 is disposed on the third mounting seat 1114. The second bearing 141 is disposed on the fourth mounting seat 1115. One end of the intermediate transmission assembly 102 is rotatably connected to the first bearing 180, and the other end of the intermediate transmission assembly 102 is rotatably connected to the second bearing 141 to improve the smoothness and stability of rotation. The locking member 115 is screwed to the internal thread 1111b of the first sub-cavity 1111 through its external thread 1151, so that the second bearing 141 is fixed to the first sub-cavity 1111. The outer ring of the second bearing 141 abuts between the shoulder 1112a and the locking member 115.

[0050] Optionally, the first bearing 180 may be a deep groove ball bearing with a clearance of 6-20 um. The second bearing 141 may be a deep groove ball bearing with a clearance of 11-25 um to improve its ability to bear axial loads, thereby further improving the smoothness and service life of the rotation of the intermediate transmission assembly 102.

[0051] Further, the motor assembly 100 further includes a locking snap ring 144. The locking snap ring 144 is used to lock the second bearing 141 onto the intermediate transmission assembly 102 to prevent the second bearing 141 from axially moving.

[0052] Further, the locking snap ring 144 is formed by connecting 8 concave-convex structures 1441 end to end, so that the locking snap ring 144 contacts the second bearing 141 more fully. The inner side of the locking snap ring 144 is V-shaped to facilitate embedding into the gap between the second bearing 141 and the intermediate transmission assembly 102.

[0053] Please refer to Figures 2 - 7 , Figure 7 which is a schematic structural diagram of the locking member 115 provided by some embodiments of the present application. In some embodiments, the end face of the locking member 115 is recessed towards the first sub-cavity 1111 to form a plurality of first hollow structures 1152 to reduce the weight of the locking member 115, thereby reducing the weight of the motor assembly 100. In other embodiments, the end face of the locking member 115 is recessed towards the first sub-cavity 1111 to form a tightening and loosening adjustment structure 1153. The tightening and loosening adjustment structure 1153 is used to cooperate with a specific tool to lock or loosen the locking member 115. The tightening and loosening adjustment structure 1153 may include, but is not limited to, a positioning hole 1153a and a plurality of grooves 1153b evenly distributed around the positioning hole 1153a. Among them, the positioning hole 1153a is used for positioning cooperation with the tool. The groove 1153b is used to cooperate with the tool to transmit the locking force or the loosening force.

[0054] Further, a second annular groove 1154 is provided on the circumferential side of the locking member 115 between the end face and the external thread 1151. The motor assembly 100 further includes a second sealing ring 162. The second sealing ring 162 is disposed in the second annular groove 1154 and abuts against the inner wall of the first sub-cavity 1111 to prevent particles and liquid from entering the box body 110 through the third opening 1111a.

[0055] Understandably, by disposing the second sealing ring 162 on the circumferential side of the locking member 115, the compression amount of the second sealing ring 162 can be made independent of the screwing process of the locking member 115, thereby avoiding a reduction in the sealing effect caused by excessive deformation of the second sealing ring 162.

[0056] Optionally, the material of the locking member 115 can be engineering plastic to further reduce the weight of the locking member 115 and the motor assembly 100.

[0057] Please refer to Figure 8 , Figure 8 FIG. is a schematic structural view of the housing assembly 120 provided by some embodiments of the present application. The housing assembly 120 may include, but is not limited to, a motor housing 121 and a magnet fixed to the inner wall of the motor housing 121. Wherein, one end of the motor housing 121 is provided with a first mounting seat 1211, and the other end of the motor housing 121 is connected to the second cavity 112 of the box body 110.

[0058] Please refer to in combination Figures 2 - 5 FIG., in some embodiments, the second cavity 112 may include, but is not limited to, a first joint portion 1121 and a main body portion 1122 connected to each other. At least two first annular grooves 1121b are provided on the circumferential side of the first joint portion 1121. The motor assembly 100 further includes at least two first sealing rings 161. The first sealing rings 161 are disposed in the first annular grooves 1121b. The first joint portion 1121 is used for being embedded in the motor housing 121, and when the first joint portion 1121 is embedded in the motor housing 121, the first sealing rings 161 abut between the motor housing 121 and the first joint portion 1121 to achieve a sealing function. Specifically, two first annular grooves 1121b may be provided on the circumferential side of the first joint portion 1121. Correspondingly, the number of the first sealing rings 161 may be two. Through the arrangement of the two first annular grooves 1121b and the two first sealing rings 161, the sealing effect between the motor housing 121 and the second cavity 112 can be better, so as to achieve a higher level of waterproof performance.

[0059] Further, a mounting edge 1122a is provided at the connection between the main body portion 1122 and the first joint portion 1121. The mounting edge 1122a surrounds the first joint portion 1121. The motor housing 121 can be attached to the mounting edge 1122a and fastened to the main body portion 1122 through fasteners. The main body portion 1122 communicates with the second sub-cavity 1112 of the first cavity 111.

[0060] Please refer to Figures 2 - 5 In some other embodiments, the second cavity 112 may include, but is not limited to, a fourth sub-cavity 1124 and a fifth sub-cavity 1125 that communicate with each other. The fifth sub-cavity 1125 communicates with the second sub-cavity 1112 of the first cavity 111. One end of the fourth sub-cavity 1124 away from the fifth sub-cavity 1125 is provided with a first opening 1121a. The fourth sub-cavity 1124 is provided with a mounting edge 1122a at one end close to the first opening 1121a. The mounting edge 1122a is used for fixedly connecting to the motor housing 121 of the housing assembly 120. A stepped structure 1122b is provided on the mounting edge 1122a, making the overall box 110 look more compact and at the same time reducing the volume and weight of the box 110. The stepped structure 1122b is provided with a wire outlet structure 1122c. The motor assembly 100 further includes a circuit board assembly 1126. The circuit board assembly 1126 is accommodated in the second cavity 112 of the box 110. Specifically, the circuit board assembly 1126 is accommodated in the fourth sub-cavity 1124 of the second cavity 112. Among them, the leads of the circuit board assembly 1126 pass through the wire outlet structure 1122c.

[0061] Furthermore, a reinforcing rib 1122d is provided between the outer wall of the fifth sub-cavity 1125 and the stepped structure 1122b to play a role in improving the strength.

[0062] Furthermore, when viewed from one side of the first opening 1121a, the fourth sub-cavity 1124 is a groove-shaped structure. The bottom of the groove of the fourth sub-cavity 1124 is provided with a plurality of second hollow structures 1124a to reduce the weight of the box 110. The plurality of second hollow structures 1124a surround the communication part between the fourth sub-cavity 1124 and the fifth sub-cavity 1125.

[0063] Furthermore, a second mounting seat 1123 is provided at one end of the fifth sub-cavity 1125 away from the fourth sub-cavity 1124. One end of the armature rotor assembly 130 is arranged on the first mounting seat 1211. The other end of the armature rotor assembly 130 is arranged on the second mounting seat 1123. Among them, the elastic adjusting member 171 is arranged between the first mounting seat 1211 and the armature rotor assembly 130 and / or between the second mounting seat 1123 and the armature rotor assembly 130 to automatically adjust the meshing clearance between the armature rotor assembly 130 and the intermediate transmission assembly 102.

[0064] Furthermore, the motor assembly 100 further includes a first bearing 180. The first bearing 180 is arranged on the first mounting seat 1211. One end of the armature rotor assembly 130 is rotatably connected to the first bearing 180 to improve the smoothness and stability of the rotation of the armature rotor assembly 130. In this embodiment, the elastic adjusting member 171 abuts between the first mounting seat 1211 and the first bearing 180.

[0065] Optionally, the first bearing 180 may be a deep groove ball bearing with a clearance of 6 - 20 μm.

[0066] Furthermore, the motor assembly 100 further includes a first bushing 191. The first bushing 191 is disposed on the second mounting seat 1123. The other end of the armature rotor assembly 130 is rotatably connected to the first bushing 191. Using a bushing instead of a bearing can save costs.

[0067] Optionally, the first bushing 191 may be an engineering plastic bushing. Engineering plastic bushings have the advantages of high strength, low cost, small mass, and lubrication-free.

[0068] Please refer to Figures 2 - 5 and Figure 12 , Figure 12 , which is a schematic structural diagram of the end cover 114 provided by some embodiments of the present application. One end of the third cavity 113 is provided with a fifth mounting seat 1131. The other end of the third cavity 113 is provided with a second opening 1132. The orientation of the second opening 1132 is opposite to the orientation of the first opening 1121a of the second cavity 112, such that the power input end and the power output end of the box body 110 are parallel. The motor assembly 100 further includes an end cover 114 and a third sealing ring 163. The end cover 114 is fixed to the third cavity 113 to block and seal the second opening 1132. The end cover 114 is provided with a support hole 1141. One end of the output shaft assembly 150 is disposed on the fifth mounting seat 1131. The other end of the output shaft assembly 150 passes through the support hole 1141. The third sealing ring 163 abuts between the third cavity 113 and the end cover 114 to prevent particles and liquid from entering the box body 110 through the second opening 1132.

[0069] Furthermore, the motor assembly 100 further includes a second bushing 192 and a third bushing 193. The second bushing 192 is disposed on the fifth mounting seat 1131. The third bushing 193 is disposed in the support hole 1141. One end of the output shaft assembly 150 is rotatably connected to the second bushing 192. The other end of the output shaft assembly 150 is rotatably connected to the third bushing 193.

[0070] Optionally, the second bushing 192 and the third bushing 193 may be engineering plastic bushings. Engineering plastic bushings have the advantages of high strength, low cost, small mass, and lubrication-free.

[0071] Further, the end cap 114 may include, but is not limited to, a connected second engaging portion 1142 and a mounting portion 1143. The second engaging portion 1142 passes through the second opening 1132 and is embedded in the other end of the third cavity 113. The mounting portion 1143 is fastened to the other end of the third cavity 113 by a fastener. A third annular groove 1144 is formed between the second engaging portion 1142 and the mounting portion 1143. The third sealing ring 163 is disposed in the third annular groove 1144.

[0072] In some embodiments, an oil baffle structure is further provided on the circumferential side of the support hole 1141 of the end cap 114 to prevent the lubricating oil in the box body 110 from leaking out through the support hole 1141.

[0073] Please refer to Figures 3 - 5 and Figures 9 - 11 , Figure 9 is a schematic structural diagram of the armature rotor assembly 130 provided by some embodiments of the present application, Figure 10 is a schematic structural diagram of the worm and worm gear assembly 140 provided by some embodiments of the present application, Figure 11 is a schematic structural diagram of the output shaft assembly 150 provided by some embodiments of the present application. The armature rotor assembly 130 may include, but is not limited to, an armature shaft 132 and a second worm 131 sleeved on the armature shaft 132. In some other embodiments, the armature rotor assembly 130 further includes a core coil assembly, a commutator, and a magnetic ring. The core coil assembly is sleeved on one end of the armature shaft 132. The second worm 131 is sleeved on the other end of the armature shaft 132. The commutator and the magnetic ring are sleeved on the armature shaft 132 and are located between the core coil assembly and the second worm 131. The second worm 131 is received in the fifth sub-cavity 1125 of the second cavity 112.

[0074] Further, the worm and worm gear assembly 140 may include, but is not limited to, a second bearing 141, a first worm gear 142, and a first worm 143 that are located on the same axis and arranged in sequence. The second bearing 141 is received in the first sub-cavity 1111 of the first cavity 111. The first worm gear 142 is received in the second sub-cavity 1112 of the first cavity 111. The first worm 143 is received in the third sub-cavity 1113 of the first cavity 111. At the communication between the second sub-cavity 1112 and the fifth sub-cavity 1125, the first worm gear 142 meshes with the second worm 131.

[0075] Further, the output shaft assembly 150 may include, but is not limited to, a second worm gear 151. The second worm gear 151 meshes with the intermediate transmission assembly 102. Specifically, at the connection between the third sub-cavity 1113 and the third cavity 113, the second worm gear 151 meshes with the first worm 143. The motor assembly 100 further includes a clearance adjusting gasket 172. The clearance adjusting gasket 172 is sleeved at both ends of the output shaft assembly 150 to adjust the axial clearance of the output shaft assembly 150. At least one clearance adjusting gasket 172 is located between the second shaft sleeve 192 and the second worm gear 151. At least one clearance adjusting gasket 172 is located between the third shaft sleeve 193 and the second worm gear 151.

[0076] Wherein, the motor 103 in this application can be understood as being composed of a housing assembly 120 and an armature rotor assembly 130. The reduction gearbox 101 can be understood as being composed of a box body 110, an intermediate transmission assembly 102 (worm and worm gear assembly 140), an end cover 114, a third sealing ring 163, a locking member 115 and a second sealing ring 162.

[0077] The reduction gearbox 101 provided in this application includes: a box body 110 provided with a first cavity 111, the first cavity 111 includes a first sub-cavity 1111, a second sub-cavity 1112 and a third sub-cavity 1113 that are in communication with each other. A third opening 1111a is provided at one end of the first sub-cavity 1111 away from the second sub-cavity 1112, and an internal thread 1111b is provided on the inner wall of the first sub-cavity 1111 at one end away from the second sub-cavity 1112; a worm and worm gear assembly 140 accommodated in the first cavity 111, the worm and worm gear assembly 140 includes a second bearing 141, a first worm gear 142 and a first worm 143 located on the same axis. The second bearing 141 is accommodated in the first sub-cavity 1111, the first worm gear 142 is accommodated in the second sub-cavity 1112, and the first worm 143 is accommodated in the third sub-cavity 1113; a locking member 115, an external thread 1151 is provided on the peripheral side of the locking member 115, and the locking member 115 is screwed with the internal thread 1111b through the external thread 1151 so that the second bearing 141 is fixed in the first sub-cavity 1111; wherein, the locking member 115 can be screwed until the end face of the locking member 115 is flush with the plane where the third opening 1111a is located. In this way, the reduction gearbox 101 will not affect the passing performance of the vehicle 10000 with the electric pedal device 1000 installed on the chassis.

[0078] The above are only some embodiments of this application, and thus do not limit the protection scope of this application. Any equivalent device or equivalent process transformation made using the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall equally be included in the patent protection scope of this application.

Claims

1. A reduction gearbox, characterized in that: include: The box body is provided with a first cavity, the first cavity includes a first sub-cavity, a second sub-cavity and a third sub-cavity which are interconnected, a third opening is provided at one end of the first sub-cavity away from the second sub-cavity, and an internal thread is provided on the inner wall of the first sub-cavity at one end away from the second sub-cavity; A worm gear assembly is accommodated in the first cavity, the worm gear assembly comprises a second bearing, a first worm gear and a first worm gear located on the same axis, the second bearing is accommodated in the first sub-cavity, the first worm gear is accommodated in the second sub-cavity, and the first worm gear is accommodated in the third sub-cavity; A locking member, wherein an external thread is provided on the circumference of the locking member, and the locking member is threadedly connected with the internal thread through the external thread, so that the second bearing is fixed to the first sub-cavity; Wherein, the locking member can be screwed to an end surface of the locking member flush with the plane where the third opening is located.

2. The reduction gearbox according to claim 1, characterized in that: The end surface of the locking member is recessed toward the first sub-cavity to form a plurality of first hollow structures.

3. The reduction gearbox according to claim 1, characterized in that: The end surface of the locking member is recessed toward the first sub-cavity to form a tightness adjustment structure.

4. The reduction gearbox according to claim 3, characterized in that: The tightness adjustment structure comprises a positioning hole and a plurality of grooves evenly distributed around the positioning hole.

5. The reduction gearbox according to claim 1, characterized in that: The locking piece is made of engineering plastic.

6. The reduction gearbox according to claim 1, characterized in that: A second annular groove is provided on the peripheral side of the locking member between the end surface and the external thread. The reduction gearbox further comprises a second sealing ring, which is arranged in the second annular groove and abuts against the inner wall of the first sub-cavity.

7. The reduction gearbox according to claim 1, characterized in that: The distance between the end surface of the locking member and the plane where the third opening is located is less than or equal to 1 mm.

8. The reduction gearbox according to claim 1, characterized in that: A stop shoulder is provided at the connection point between the first sub-cavity and the second sub-cavity, and the outer ring of the second bearing abuts between the stop shoulder and the locking member.

9. The reduction gearbox according to claim 1, characterized in that: The reduction gearbox further includes a second cavity and a third cavity, wherein the second cavity is communicated with the second sub-cavity, and the third cavity is communicated with the third sub-cavity.

10. A motor assembly, characterized in that: include: Motor; A reduction box, the input end of which is drivingly connected to the output end of the motor; An output shaft assembly, drivingly connected to the output end of the reduction box; Wherein, the reduction gearbox is the reduction gearbox as described in any one of claims 1-9.

11. An electric pedal device, characterized in that: It comprises the motor assembly as claimed in claim 10, wherein the motor assembly comprises a reduction box, and when the electric pedal device is fixed to the chassis of the vehicle, the end surface of the locking member of the reduction box faces the ground.

12. A vehicle, characterized in that: Comprising the electric pedal device as claimed in claim 11.

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