Speed reducer and electric drive system

Abstract

The utility model provides a speed reducer and an electric drive system, the speed reducer comprises a shell and a transmission device, at least part of the shell comprises a supporting shell and a wrapping shell, the supporting shell is provided with a supporting shaft hole and a hollow hole, and the wrapping shell is arranged in the hollow hole and seals the hollow hole. The transmission device is arranged in the shell and comprises a transmission shaft, and the transmission shaft is rotationally supported in the supporting shaft hole. Wherein the density range of the supporting shell is 2.0-10.0 g / cm < 3 >, and the density range of the coating shell is 1.0-2.0 g / cm < 3 >. The transmission device is contained in the outer shell, the outer shell comprises the supporting shell body and the wrapping shell body, the supporting shell body is high in strength and can play a role in supporting and protecting, and the transmission device in the outer shell is protected. The wrapping shell is made of light-weight materials and covers the supporting shell, the weight of the speed reducer is further reduced under the condition that the strength requirement is met, the efficiency of the speed reducer is improved, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of automobile drive technology, and in particular to a reducer and an electric drive system. Background Art

[0002] With the development of automobile technology, the new energy automobile industry has developed rapidly. The reducer plays the role of matching speed and transmitting torque between the prime mover and the working machine or actuator, and is widely used in modern machinery.

[0003] In the field of automobile production, the speed of electric vehicles is largely determined by the weight of the vehicle itself. Therefore, it is necessary to reduce the weight of electric vehicles to make them lightweight, so that they can have a faster speed and save production materials. One of the more important aspects of weight reduction is to reduce the weight of the reducer. Generally, the reducer is cast with cast iron as the material for the shell casting. In the structural design, many connecting places are connected by casting and filling. Therefore, many reinforced fixing places are also solid structures, which greatly increases the weight of the reducer and increases the cost. Therefore, it is necessary to improve the existing reducer to reduce the weight of the reducer and achieve the purpose of lightweighting. Utility Model Content

[0004] The purpose of the present application is to provide a reducer, thereby overcoming the problems of heavy weight and high cost of the reducer.

[0005] In one aspect of the present application, a reducer is provided, comprising a housing and a transmission device, wherein at least a portion of the housing comprises a support shell and a covering shell, wherein the support shell is provided with a support shaft hole and a hollow hole, and the covering shell is arranged in the hollow hole and seals the hollow hole. The transmission device is arranged in the housing, and the transmission device comprises a transmission shaft, and the transmission shaft is rotatably supported in the support shaft hole. The density of the support shell is in the range of 2.0 to 10.0 g / cm3, and the density of the covering shell is in the range of 1.0 to 2.0 g / cm3.

[0006] Furthermore, the supporting shell is a metal shell, and the covering shell is a plastic shell.

[0007] Furthermore, the supporting shell is a steel alloy shell, and the covering shell is an aluminum alloy shell.

[0008] Furthermore, the support shaft hole and the hollow hole penetrate two opposite side surfaces of the support shell. The support shell forms a support frame between the support shaft hole and the hollow hole, and the covering shell is connected to the support frame.

[0009] Furthermore, the support frame includes an annular edge frame and a reinforcement frame, wherein the reinforcement frame connects the edge frame and the edge of the support shaft hole and the edges of two adjacent support shaft holes. The hollow holes include a plurality of hollow holes, each of which is formed between the reinforcement frame, the edge frame and the edge of the support shaft hole.

[0010] Furthermore, the reinforcing skeleton is provided in plurality, and the plurality of reinforcing skeletons are cross-connected to each other, or the extension lines of the plurality of reinforcing skeletons are cross-connected to each other.

[0011] Furthermore, the reinforcement skeleton is arranged radially with the center of the support shaft hole as the center of the circle.

[0012] Furthermore, there are multiple covering shells, and each of the covering shells is fixedly connected to the corresponding hollow hole by injection molding, wrapping or adhesion.

[0013] Furthermore, the housing includes a first shell and a second shell fixed to each other, the first shell and the second shell are fixed to form the housing. A cavity is formed inside the housing, the transmission device is arranged in the housing, and at least one of the first shell and the second shell is arranged to include the supporting shell and the covering shell.

[0014] Furthermore, the present application also provides an electric drive system, which includes the above-mentioned reducer.

[0015] A reducer of the present application has the following beneficial effects: the reducer provided by the present application includes a housing and a transmission device, at least part of the housing includes a support shell and a coating shell, the support shell is provided with a support shaft hole and a hollow hole, the coating shell is arranged in the hollow hole and seals the hollow hole. The transmission device is arranged in the housing, the transmission device includes a transmission shaft, and the transmission shaft is rotatably supported in the support shaft hole. Among them, the density of the support shell is 2.0 to 10.0g / cm3, and the density of the coating shell is 1.0 to 2.0g / cm3. The transmission device is accommodated in the housing, the housing includes a support shell and a coating shell, the support shell is strong, and can play a supporting and protective role to protect the internal transmission device. The coating shell is made of lightweight material and covers the outside of the support shell, which further reduces the weight of the reducer while meeting the strength requirements, improves the efficiency of the reducer, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of a reducer of the present application;

[0018] Figure 2 is a schematic cross-sectional structural diagram of the reducer, including a support housing;

[0019] Figure 3 yes Figure 2 A schematic structural diagram of the support shell described in FIG.

[0020] Description of reference numerals:

[0021] 1. Reducer; 2. Housing; 3. Transmission device;

[0022] 21. Support shell; 22. Covering shell; 23. First shell; 24. Second shell; 31. Transmission shaft;

[0023] 211, support shaft hole; 212, hollow hole; 213, support frame; 214, edge frame; 215, reinforcement frame; 216, fixing hole; 217, fastener. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0025] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0026] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0027] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0028] See also Figures 1 to 3 The present application provides a reducer 1, including a housing 2 and a transmission device 3, wherein at least part of the housing 2 includes a support shell 21 and a covering shell 22, wherein the support shell 21 is provided with a support shaft hole 211 and a hollow hole 212, and the covering shell 22 is disposed in the hollow hole 212 and seals the hollow hole 212. The transmission device 3 is disposed in the housing 2, and the transmission device 3 includes a transmission shaft, and the transmission shaft is rotatably supported in the support shaft hole 211. The density of the support shell 21 is in the range of 2.0 to 10.0 g / cm3, and the density of the covering shell 22 is in the range of 1.0 to 2.0 g / cm3. The transmission device 3 is accommodated in the housing 2, and the housing 2 includes a support shell 21 and a covering shell 22. The support shell 21 is within a certain density range, which can ensure that the strength of the support shell 21 is large, and can play a supporting and protective role to protect the internal transmission device 3. The covering shell 22 is made of lightweight material and covers the outside of the supporting shell 21 , which further reduces the weight of the reducer 1 while meeting the strength requirements, improves the efficiency of the reducer 1 , and reduces the cost.

[0029] In some embodiments, preferably, the supporting shell 21 may be a metal shell, and the covering shell 22 may be a plastic shell. The metal shell has the advantages of high strength, wear resistance, and corrosion resistance, and can support the internal transmission device 3, protect the transmission device 3 from damage, and ensure the shape and reliability of the reducer 1. The covering shell 22 is made of plastic material, which has the advantages of lightness, wear resistance, and low cost. It covers the outside of the supporting shell 21, protects the transmission device 3, greatly reduces the weight of the reducer 1, saves costs, and improves the product experience.

[0030] Specifically, the support shell 21 can also be a steel alloy shell, and the covering shell 22 can be an aluminum alloy shell. The steel alloy shell has high strength and provides support and protection, and can be used as the support shell 21, while the aluminum alloy shell has low density and good corrosion resistance, and can be used as the covering shell 22 to well protect the internal transmission device 3 from damage, thereby reducing the weight of the reducer 1 while ensuring the quality of the reducer 1.

[0031] Preferably, refer to Figure 2, the support shaft hole 211 and the hollow hole 212 penetrate the two opposite sides of the support shell 21. The support shell 21 is formed with a support frame 213 between the support shaft hole 211 and the hollow hole 212, and the covering shell 22 is connected to the support frame 213. The support shaft hole 211 and the hollow hole 212 penetrate the support shell 21, the transmission shaft is fixedly installed in the support shaft hole 211, the support frame 213 is connected to form the support shaft hole 211 and the hollow hole 212, and the covering shell 22 is based on the support frame 213 to cover and connect the support frame 213, forming the outer shell 2 to protect the transmission shaft and other components, thereby improving the durability of the reducer 1.

[0032] Please continue to refer to Figure 3 The support frame 213 includes a ring-shaped edge frame 214 and a reinforcement frame 215. The reinforcement frame 215 connects the edge frame 214 and the edge of the support shaft hole 211 and the edges of the two adjacent support shaft holes 211. The hollow holes 212 include a plurality of hollow holes 212, each of which is formed between the reinforcement frame 215, the edge frame 214 and the edge of the support shaft hole 211. The edge frame 214 is the edge of the shell 2, and the reinforcement frame 215 connects the edge frame 214 and the edges of several support shaft holes 211 to form the hollow holes 212. The hollow holes 212 are mostly triangular structures, and the triangular structure has good stability, which improves the support performance of the shell 2 and ensures the reliability of the shell 2. Specifically, the hollow hole 212 can also be a quadrilateral or other polygon. The size of the hollow hole 212 is set according to the actual situation to ensure the support force of the support frame 213. The setting of the hollow hole 212 greatly reduces the weight of the reducer 1 and improves the endurance of the vehicle.

[0033] Furthermore, a plurality of reinforcing frames 215 are provided, and the plurality of reinforcing frames 215 are cross-connected to each other, or the extension lines of the plurality of reinforcing frames 215 are cross-connected to each other. The frame structure of the support frame 213 reduces the weight of the reducer 1, and the reduction in the weight of the reducer 1 improves the endurance of the vehicle and saves energy. In addition, the reinforcing frame 215 is connected to the support shaft hole 211 and the edge frame 214, and the cross-connection of the plurality of reinforcing frames 215 can improve the strength and stability of the housing 2 of the reducer 1, so that the housing 2 is not easily deformed, thereby ensuring the stability of the reducer 1.

[0034] Please refer to Figure 3 The reinforcing frames 215 are arranged radially with the center of the supporting shaft hole 211 as the center of the circle. The reinforcing frames 215 are arranged radially and radiate from the center of the circle to the adjacent supporting shaft holes 211 and the edge frames 214 to connect, thereby improving the structural strength.

[0035] Specifically, there are multiple covering shells 22, and each covering shell 22 is fixedly connected to the corresponding hollow hole 212 by injection molding, wrapping or adhesion. The covering shell 22 is fixedly integrated with the support frame 213 by injection molding, wrapping or adhesion, etc., which has good stability and is not easy to fall off and separate, thereby improving the quality of the reducer 1.

[0036] In some embodiments, reference Figure 1 The housing 2 includes a first housing 23 and a second housing 24 fixed to each other, and the first housing 23 and the second housing 24 are fixed to form the housing 2. A cavity is formed inside the housing 2, and the transmission device 3 is arranged in the housing 2. At least one of the first housing 23 and the second housing 24 is arranged to include a supporting housing 21 and a covering housing 22. The first housing 23 is used to fix and install the transmission shaft and other parts, and the second housing 24 covers the first housing 23. In addition, a fixing hole 216 is also arranged on the edge frame 214 of the first housing 23 and the second housing 24. The fastener 217 passes through the fixing hole 216 to connect the first housing 23 and the second housing 24 to form the reducer 1. The first housing 23 and the second housing 24 can both be arranged to include the supporting housing 21 and the covering housing 22, or one of the first housing 23 and the second housing 24 can be arranged to include the supporting housing 21 and the covering housing 22. Such an arrangement can reduce the weight of the reducer 1 and improve the vehicle's endurance.

[0037] The present application also provides an electric drive system, which includes the above-mentioned reducer 1.

[0038] In this application, unless otherwise clearly specified and limited, the terms "disposed (provided with)", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the description of this specification, the description of reference terms such as "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made according to the claims and description of the present application should fall within the scope of the present application.

Claims

1. A reducer, characterized in that: It includes: A shell, at least part of which includes a supporting shell and a covering shell, wherein the supporting shell is provided with a supporting shaft hole and a hollow hole, and the covering shell is arranged in the hollow hole and seals the hollow hole; A transmission device, the transmission device is arranged in the housing, the transmission device comprises a transmission shaft, and the transmission shaft is rotatably supported in the support shaft hole; wherein, The density of the supporting shell is in the range of 2.0 to 10.0 g / cm3, and the density of the covering shell is in the range of 1.0 to 2.0 g / cm3.

2. The reducer according to claim 1, characterized in that: The supporting shell is a metal shell, and the covering shell is a plastic shell.

3. The reducer according to claim 1, characterized in that: The supporting shell is a steel alloy shell, and the covering shell is an aluminum alloy shell.

4. The reducer according to claim 1, characterized in that: The support shaft hole and the hollow hole penetrate two opposite side surfaces of the support shell; The support shell forms a support frame between the support shaft hole and the hollow hole; The covering shell is connected to the supporting frame.

5. The reducer according to claim 4, characterized in that: The support frame includes an annular edge frame and a reinforcement frame; The reinforcing frame connects the edge frame and the edge of the support shaft hole and the edges of two adjacent support shaft holes; The hollow holes include a plurality of hollow holes, each of which is formed between the reinforcing frame, the edge frame and the edge of the supporting shaft hole.

6. The reducer according to claim 5, characterized in that: There are multiple reinforcing frames, and the multiple reinforcing frames are cross-connected to each other, or the extension lines of the multiple reinforcing frames are cross-connected to each other.

7. The reducer according to claim 5, characterized in that: The reinforcement frames are arranged radially with the center of the support shaft hole as the center of the circle.

8. The reducer according to claim 1, characterized in that: There are multiple covering shells, and each of the covering shells is fixedly connected in the corresponding hollow hole by injection molding, wrapping or adhesion.

9. The reducer according to any one of claims 1 to 4, characterized in that: The housing comprises a first shell and a second shell fixed to each other, wherein the first shell and the second shell are fixed to form the housing; A cavity is formed inside the shell, and the transmission device is arranged inside the shell; At least one of the first shell and the second shell is configured to include the supporting shell and the covering shell.

10. An electric drive system, characterized in that: The electric drive system includes a reducer as described in any one of claims 1 to 9 above.

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