Wheel hub motor speed reducer

Abstract

The embodiment of the utility model provides a hub motor speed reducer. The hub motor speed reducer comprises a first-stage inner gear ring, a second-stage inner gear ring, a first-stage sun gear, a second-stage sun gear, a first-stage planet gear, a second-stage planet gear, a first planet carrier, a second planet carrier, a first brake and a second brake. Wherein the first-stage inner gear ring is connected with the hub, and the second-stage inner gear ring is connected with the first-stage inner gear ring through the second brake and the jaw clutch; the first-stage sun gear is connected with the motor, and the second-stage sun gear is fixed with the first-stage planet carrier; the first-stage planet gear is connected with the first-stage sun gear, the second-stage planet gear is connected with the second-stage sun gear, the second-stage planet carrier is fixed to a frame of the vehicle, and the second-stage planet carrier is connected with the first brake. Switching of two gears is achieved through conversion of an internal mechanical structure of the speed reducer, then large-torque output or high-rotating-speed output of the hub motor is achieved, and the problem that an existing hub motor speed reducer cannot achieve large-torque output is solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle reducers, and in particular to a wheel hub motor reducer. Background Art

[0002] In-wheel motors, also known as in-wheel motor technology, are motors that place the drive, transmission and brake devices all inside the wheel hub. By integrating the power system into the wheel hub, the mechanical part of the electric vehicle can be greatly simplified, reducing the components such as the engine, gearbox, drive shaft and exhaust system required for traditional cars.

[0003] The wheel hub motor reducer is an important component of the wheel hub motor system. Its main function is to match the motor speed and torque to meet the driving needs of the vehicle. The wheel hub motor reducer currently used in vehicles has a single gear, which is divided into a reduction drive system and a direct drive system. It mainly controls the motor torque and speed by controlling the current, and switches whether the reducer is connected or not to achieve two torque outputs. This method cannot achieve high torque output, especially on non-road vehicles, such as engineering vehicles and agricultural vehicles. These vehicles require extremely large torque output when performing special operations, and ordinary wheel hub motor reducers cannot meet the needs.

[0004] Therefore, developing a multi-gear wheel reducer is of great significance for vehicles that require large torque output. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a hub motor reducer to solve the technical problem that the hub motor reducer in the prior art cannot achieve high torque output.

[0006] The present disclosure provides a hub motor reducer, comprising: an inner gear ring unit, a sun gear unit, a planetary gear unit, a planetary carrier unit and a brake unit; the inner gear ring unit comprises a primary inner gear ring and a secondary inner gear ring, the sun gear unit comprises a primary sun gear and a secondary sun gear, the planetary gear unit comprises a primary planetary gear and a secondary planetary gear, the planetary carrier comprises a primary planetary carrier and a secondary planetary carrier, and the brake unit comprises a first brake and a second brake; wherein: the primary inner gear ring is connected to the wheel hub, and the secondary inner gear ring is connected to the primary inner gear ring through the second brake and a tooth clutch; the primary sun gear is connected to the motor, and the secondary sun gear is fixed to the primary planetary carrier; the primary The planetary gear is connected to the primary sun gear, the secondary planetary gear is connected to the secondary sun gear, the secondary planetary carrier is fixed to the frame of the vehicle, and the secondary planetary carrier is connected to the first brake; when the secondary internal gear ring is pushed by the shift push rod, it pushes the second brake to brake, the tooth clutch is engaged, the secondary internal gear ring is connected to the primary internal gear ring, the first brake is disengaged, the primary planetary carrier is in a non-fixed state, and the gear position of the reducer is changed from the second gear to the first gear; when the shift push rod is pulled back to its original position, the first brake is applied, the second brake is disengaged, the tooth clutch is disengaged, the primary planetary carrier is in a fixed state, and the gear position of the reducer is changed from the first gear to the second gear.

[0007] In one embodiment of the present disclosure, the secondary sun gear and the primary planet carrier are an integral structure.

[0008] In one embodiment of the present disclosure, the output shaft sleeve of the motor is located in the sleeve of the integral structure.

[0009] In one embodiment of the present disclosure, the components on the motor output shaft are supported by bearings.

[0010] In one embodiment of the present disclosure, the bearing includes a first bearing, a second bearing and a third bearing connected in sequence.

[0011] In one embodiment of the present disclosure, the edge of the primary internal gear ring is supported by a bearing and a sliding key.

[0012] In one embodiment of the present disclosure, the first brake is connected to the secondary planet carrier via a sliding key.

[0013] In one embodiment of the present disclosure, the secondary planetary gear is close to the cover plate of the reducer.

[0014] In one embodiment of the present disclosure, a push rod slide rail connected between the push rod and the brake unit is also included.

[0015] In one embodiment of the present disclosure, the primary internal gear ring is coaxially connected to the wheel hub.

[0016] As described above, a hub motor reducer is provided in the embodiment of the present disclosure, which realizes the switching of two gears by changing the internal mechanical structure of the reducer, thereby realizing high torque output or high speed output of the hub motor, so as to solve the problem that the existing hub motor reducer cannot achieve high torque output. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram showing the overall structure of a hub motor reducer in one embodiment of the present disclosure is shown.

[0018] Figure 2 A schematic diagram showing a hub motor reducer in second gear according to an embodiment of the present disclosure.

[0019] Figure 3 A schematic diagram showing the first brake and the push rod when the hub motor reducer is in the second gear in one embodiment of the present disclosure.

[0020] Figure 4 A schematic diagram showing a hub motor reducer in first gear according to an embodiment of the present disclosure.

[0021] Figure 5 A schematic diagram showing the connection between the bearing and the sliding key in a hub motor reducer in one embodiment of the present disclosure.

[0022] Figure 6 A schematic diagram showing the connection principle between the second brake and the tooth clutch in the hub motor reducer in one embodiment of the present disclosure is shown.

[0023] Figure 7 A schematic diagram showing a tooth clutch in a hub motor reducer in one embodiment of the present disclosure.

[0024] Figure 8 A schematic diagram showing the overall structural principle of a hub motor reducer in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0026] Below Figures 1 to 8For reference, the embodiments of the present disclosure are described in detail so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0027] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0028] In addition, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0029] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0030] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0031] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0032] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0033] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0034] Existing wheel hub motor reducers have only a single gear, and when the motor torque reaches a limit, the output torque of the reducer also reaches a limit, and the gear cannot be adjusted. This embodiment provides a wheel hub motor reducer. The purpose of this disclosure is to provide a wheel hub motor reducer to solve the technical problem that the wheel hub motor reducer in the prior art cannot achieve high torque output.

[0035] The hub motor reducer provided in this embodiment has a variable gear position. It is usually in the high-speed and low-torque second gear, and can be switched to the first gear when there is a large torque demand. The combined use of the brake and the tooth clutch makes the reducer gear adjustment simple and convenient. The presence of the tooth clutch makes it unnecessary to keep the brake on in the first gear, which saves the use of a considerable part of the mechanical structure, such as the spring or electrical structure that keeps the brake engaged. At the same time, the reverse disengagement feature of the tooth clutch also avoids damage to the internal mechanical structure when the vehicle reverses in an emergency.

[0036] The wheel hub motor reducer of this embodiment is described in detail below so that those skilled in the art can understand the wheel hub motor reducer of this embodiment without creative work.

[0037] like Figure 1 As shown, this embodiment provides a hub motor reducer, which includes: an inner gear ring unit, a sun gear unit, a planetary gear unit, a planetary carrier unit and a brake unit. The inner gear ring unit includes a primary inner gear ring Z3 and a secondary inner gear ring Z6, the sun gear unit includes a primary sun gear Z1 and a secondary sun gear Z4, the planetary gear unit includes a primary planetary gear Z2 and a secondary planetary gear Z5, the planetary carrier includes a primary planetary carrier H1 and a secondary planetary carrier H2, and the brake unit includes a first brake B1 and a second brake B2.

[0038] Among them: specifically, the first-stage internal gear ring Z3 is connected to the wheel hub, and the second-stage internal gear ring Z6 is connected to the first-stage internal gear ring Z3 through the second brake B2 and a tooth clutch B3; the first-stage sun gear Z1 is connected to the motor, and the second-stage sun gear Z4 is fixed to the first-stage planetary carrier H1; the first-stage planetary gear Z2 is connected to the first-stage sun gear Z1, the second-stage planetary gear Z5 is connected to the second-stage sun gear Z4, the second-stage planetary carrier H2 is fixed to the frame of the vehicle, and the second-stage planetary carrier H2 is connected to the first brake B1.

[0039] like Figure 2 and Figure 3 As shown, when the secondary inner gear ring Z6 is pushed by the shift push rod T1, it pushes the second brake B2 to brake, the tooth clutch B3 is engaged, the secondary inner gear ring Z6 is connected to the primary inner gear ring Z3, the first brake B1 is disengaged, and the primary planet carrier H1 is in a non-fixed state, and the gear position of the reducer is changed from the second gear to the first gear. Figure 4 As shown, when the shift push rod T1 is pulled back to its original position, the first brake B1 is braked, the second brake B2 is released, the tooth clutch B3 is released, and the primary planet carrier H1 is fixed, and the gear position of the reducer is changed from the first gear to the second gear.

[0040] In one implementation of this embodiment, the primary internal gear ring Z3 is coaxially connected to the wheel hub, that is, the primary internal gear ring Z3 of the reducer is directly connected to the wheel hub as the output end, and the coaxiality is ensured.

[0041] In one implementation of this embodiment, the motor is connected to the primary sun gear Z1, and the secondary sun gear Z4 and the primary planet carrier H1 are an integral structure. The planet carrier and the sun gear are an integral structure, which usually means that in a planetary gear system, the sun gear and the planet carrier are designed as a single component. Such a design can improve the rigidity of the entire system, reduce the weight and space occupied between components, and simplify the assembly process.

[0042] In one implementation of this embodiment, the output shaft sleeve of the motor is located in the sleeve of the overall structure, and the components on the output shaft of the motor are supported by bearings.

[0043] In one implementation of this embodiment, Figure 6 As shown, the bearing includes a first bearing P1, a second bearing P2 and a third bearing P3 which are connected in sequence.

[0044] In one implementation of this embodiment, Figure 5 As shown, the edge of the primary inner gear ring Z3 is supported by a bearing and a sliding key K1. In this embodiment, the secondary inner gear ring Z6 can slide left and right relative to the whole, and the left edge of the secondary inner gear ring Z6 and the primary inner gear ring Z3 is supported by a bearing and a sliding key K1.

[0045] In one implementation of this embodiment, the secondary planet carrier H2 is fixed to the vehicle frame, wherein the first brake B1 is connected to the secondary planet carrier H2 via a sliding key K1 to ensure normal braking of the first brake B1.

[0046] In one implementation of this embodiment, the secondary planetary gear Z5 is close to the cover plate of the reducer, and the cover plate of the reducer is used for sealing.

[0047] In this embodiment, Figure 6 As shown, the second brake B2 and the tooth clutch B3 are used to connect the secondary inner gear ring Z6 with the primary inner gear ring Z3 and perform gear shifting. The tooth clutch B3 is also called a claw clutch or a dog clutch and is used to transfer torque between two rotating shafts. Figure 7 As shown, the working principle of the tooth clutch B3 is to achieve connection and disconnection through a set of mutually meshing "teeth" or "claws".

[0048] In one implementation of this embodiment, it further includes a push rod slide rail G1 connected between the push rod T1 and the brake unit.

[0049] Among them, in this embodiment, the reducer has two gears, and the second gear is the default gear.

[0050] In this embodiment, Figure 4 As shown, the process of changing from the second gear to the first gear is:

[0051] Move the left push rod T1, that is, push the push rod T1 to the right, and then push the secondary inner gear Z6 to the right, connect the tooth clutch B3, and then the secondary inner gear Z6 is connected to the primary inner gear Z3, and the first brake B1 is disengaged. At this time, the primary planet carrier H1 becomes a non-fixed state. The power transmission path at this time is motor M→primary sun gear Z1→primary planet gear Z2→primary planet carrier H1→secondary sun gear Z4→secondary planet gear Z5→secondary inner gear Z6; calculate the first gear transmission ratio at this time, that is, the total transmission ratio:

[0052]

[0053] The process of changing from first gear to second gear is:

[0054] like Figure 2 , Figure 3 as well as Figure 8 As shown, the push rod T1 remains on the left side, the second brake B2 is disengaged, and the first brake B1 is applied at the same time to fix the primary planetary carrier H1. According to the characteristic that the tooth clutch B3 will disengage from each other under the action of reverse torque, the power is only amplified through the primary sun gear Z1 to the primary inner ring gear Z3 as the second gear output.

[0055] In this embodiment, the combined use of the brake and the tooth clutch B3 makes the gear adjustment of the reducer simple and convenient. The presence of the tooth clutch B3 eliminates the need to keep the brake on all the time when the vehicle is in first gear, which saves the use of a considerable amount of mechanical structure, such as the spring or electrical structure that keeps the brake engaged. At the same time, the reverse disengagement feature of the tooth clutch B3 also avoids damage to the internal mechanical structure when the vehicle reverses in an emergency.

[0056] To sum up, a hub motor reducer is provided in the embodiments of the present disclosure, which realizes the switching of two gears by changing the internal mechanical structure of the reducer, thereby realizing high torque output or high speed output of the hub motor, so as to solve the problem that the existing hub motor reducer cannot achieve high torque output.

[0057] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the claims of the present disclosure.

Claims

1. A hub motor reducer, characterized in that: include: Internal gear ring unit, sun gear unit, planetary gear unit, planet carrier unit and brake unit; The inner gear ring unit includes a primary inner gear ring and a secondary inner gear ring, the sun gear unit includes a primary sun gear and a secondary sun gear, the planetary gear unit includes a primary planetary gear and a secondary planetary gear, the planetary carrier includes a primary planetary carrier and a secondary planetary carrier, and the brake unit includes a first brake and a second brake; wherein: The primary inner gear ring is connected to the wheel hub, and the secondary inner gear ring is connected to the primary inner gear ring through the second brake and a dog clutch; the primary sun gear is connected to the motor, and the secondary sun gear is fixed to the primary planet carrier; the primary planet gear is connected to the primary sun gear, the secondary planet gear is connected to the secondary sun gear, the secondary planet carrier is fixed to the vehicle frame, and the secondary planet carrier is connected to the first brake; When the secondary internal gear ring is pushed by the shift push rod, it pushes the second brake to brake, the tooth clutch engages, the secondary internal gear ring is connected to the primary internal gear ring, the first brake is disengaged, the primary planetary carrier is in a non-fixed state, and the gear position of the reducer is changed from the second gear to the first gear; when the shift push rod is pulled back to its original position, the first brake is braked, the second brake is disengaged, the tooth clutch is disengaged, the primary planetary carrier is in a fixed state, and the gear position of the reducer is changed from the first gear to the second gear.

2. The hub motor reducer according to claim 1, characterized in that: The secondary sun gear and the primary planet carrier are an integral structure.

3. The hub motor reducer according to claim 2, characterized in that: The output shaft sleeve of the motor is located in the sleeve of the integral structure.

4. The hub motor reducer according to claim 1, characterized in that: The components on the motor output shaft are supported by bearings.

5. The hub motor reducer according to claim 4, characterized in that: The bearing includes a first bearing, a second bearing and a third bearing which are connected in sequence.

6. The hub motor reducer according to claim 1, characterized in that: The edge of the primary inner gear ring is supported by a bearing and a sliding key.

7. The hub motor reducer according to claim 1, characterized in that: The first brake is connected to the secondary planet carrier via a sliding key.

8. The hub motor reducer according to claim 1, characterized in that: The secondary planetary gear is close to the cover plate of the reducer.

9. The hub motor reducer according to claim 1, characterized in that: Also included is a push rod slide rail connected between the push rod and the brake unit.

10. The hub motor reducer according to claim 1, characterized in that: The primary internal gear ring is coaxially connected to the wheel hub.

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