Hub power assembly and automobile

Abstract

A kind of wheel hub power assembly and automobile.The wheel hub power assembly includes: reducer air passage device;The reducer air passage device includes: air release valve on the shell, and air passage structure between the reducer and wheel hub bearing;The air passage structure includes: air passage structure main body, and at least one gap tooth slot on the outer periphery of the air passage structure main body, adjacent gap tooth slot is connected by tooth slot connecting portion;Air passage groove is formed between the air passage structure and the shell;The air release valve is aligned with the tooth slot connecting portion, and gas passage is formed between the air passage groove.The above scheme can prevent reducer oil leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a wheel hub power assembly and a vehicle. BACKGROUND

[0002] Wheel hub motor technology, also known as in-wheel motor technology, integrates power, braking and transmission devices into the wheel hub, thus greatly simplifying the mechanical part of the vehicle. The power, braking and transmission devices integrated into the wheel hub form a wheel hub assembly.

[0003] The power device of the wheel hub assembly is a wheel hub power assembly, which includes a motor and a reducer connected with the motor. The driving torque output by the motor is output to the wheel through the reducer, thereby driving the wheel. The reducer can reduce the rotating speed of the motor and increase the output torque.

[0004] In the existing wheel hub power assembly, a vent valve is usually provided. When the pressure inside the reducer increases, the high pressure inside the reducer can be discharged through the vent valve to balance the internal and external air pressures of the reducer.

[0005] However, when the existing reducer is running, a large amount of oil foam and splashing oil will exist at the vent valve, which will overflow into the atmosphere through the vent valve, causing the reducer to leak oil and affecting the normal operation of the reducer. SUMMARY

[0006] The problem to be solved by the present application is how to prevent the reducer from leaking oil.

[0007] To solve the above problems, the present application provides a wheel hub power assembly, which comprises a housing, a motor, a reducer and a reducer venting device. The motor, the housing and the wheel hub bearing form an accommodating cavity. The reducer and the reducer venting device are located in the accommodating cavity, and the power output end of the reducer is connected with the motor. The power output end of the reducer is output to the wheel hub through the wheel hub bearing. Wherein:

[0008] The reducer venting device comprises a vent valve located on the housing and a venting structure located between the reducer and the wheel hub bearing.

[0009] The venting structure comprises a venting structure main body and at least one notched tooth groove located on the outer periphery of the venting structure main body, and adjacent notched tooth grooves are connected through a tooth groove connecting part. The venting structure and the housing form a venting groove therebetween. The vent valve is aligned with the tooth groove connecting part and forms a gas passage with the venting groove.

[0010] Optionally, the venting structure main body has a central through hole, and the power output end of the reducer is connected with the wheel hub bearing through the central through hole.

[0011] Optionally, the notch tooth groove is distributed along the axial direction of the air permeable structure body and penetrates the air permeable structure body.

[0012] Optionally, in the axial direction, the air permeable structure body covers the outer ring of the hub bearing and exposes the inner ring of the hub bearing.

[0013] Optionally, the air permeable structure has a circular cross-sectional shape in the radial direction.

[0014] Optionally, the tooth groove connecting portion includes a first tooth groove connecting portion and a second tooth groove connecting portion, the outer arc length of the first tooth groove connecting portion is greater than the outer arc length of the second tooth groove connecting portion, and the tooth groove connecting portion aligned with the air release valve is the first tooth groove connecting portion.

[0015] Optionally, the arc length of the first tooth groove connecting portion is 3 times the arc length of the second tooth groove connecting portion.

[0016] Optionally, the side wall of the first tooth groove connecting portion abuts against the shell and is in interference fit with the shell.

[0017] Optionally, the air permeable device of the speed reducer further comprises:

[0018] An oil plug is located on the shell and corresponds to the lowest point of the air permeable structure in the radial direction.

[0019] Optionally, a plurality of mounting holes are provided on the air permeable structure body for fixing the air permeable structure on the shell.

[0020] The embodiment of the present application also provides an automobile, which comprises the hub power assembly of any one of the above.

[0021] Compared with the prior art, the technical scheme of the embodiment of the present application has the following advantages:

[0022] By applying the scheme of the present application, the air permeable device of the speed reducer comprises an air release valve and an air permeable structure, at least one notch tooth groove is provided on the outer periphery of the air permeable structure body of the air permeable structure, adjacent notch tooth grooves are connected through tooth groove connecting portions, and the air permeable structure and the shell form an air permeable groove therebetween. Since the air release valve is aligned with the tooth groove connecting portion and forms a gas passage between the air permeable groove, the tooth groove connecting portion can shield oil, preventing the oil from overflowing into the atmosphere through the air release valve. Even if the oil enters the gas passage, it will slide downward in the gas passage under the action of gravity. At the same time, when the air pressure in the speed reducer increases, the gas can enter the gas passage through the notch tooth groove and then be discharged from the air release valve, thereby maintaining the balance of the air pressure inside and outside the speed reducer, ensuring air permeability while preventing oil leakage. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the position of a hub power assembly;

[0024] Figure 2 is a right view of a ventilation structure in an embodiment of the present application, wherein A is a sectional view along the radial direction of the part;

[0025] Figure 3 is a left view of a ventilation structure in an embodiment of the present application;

[0026] Figure 4 is Figure 2 is a sectional view along the direction of B-B of the ventilation structure in the embodiment. DETAILED DESCRIPTION

[0027] When the existing reducer is running, a large amount of oil foam and splashing oil will exist at the air release valve, which will overflow to the atmosphere through the air release valve, causing the reducer to leak oil and affecting the normal operation of the reducer.

[0028] To solve the above problems, an embodiment of the present application provides a hub power assembly. The hub power assembly reducer ventilation device comprises an air release valve and a ventilation structure. The ventilation structure main body is provided with at least one notched tooth groove on the outer periphery. Adjacent notched tooth grooves are connected through tooth groove connecting parts. The ventilation structure and the shell form a ventilation groove. The air release valve is aligned with the tooth groove connecting part and forms a gas passage with the ventilation groove. The tooth groove connecting part can shield the oil, preventing the oil from overflowing to the atmosphere through the air release valve. Even if the oil enters the gas passage, it will slide down in the gas passage under the action of gravity. At the same time, when the air pressure in the reducer rises, the gas can enter the gas passage through the notched tooth groove and then be discharged from the air release valve, maintaining the balance of the air pressure inside and outside the reducer. The ventilation is ensured while preventing oil leakage.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0030] With reference to Figure 1 , an embodiment of the present application provides a hub power assembly 10. One end of the hub power assembly 10 is connected to a steering drive device 30 through a fork arm structure 20, and the other end is connected to the hub of a wheel 10.

[0031] In practical application, when the vehicle is running straight, the steering driving device 30 can not be started, i.e. no steering control signal is sent to the steering driving device 30, the motor shaft is directly driven by the hub power assembly 10 on the wheel 10 to rotate the wheel, and the vehicle runs straight. When the vehicle needs to turn, a steering control signal is sent to the steering driving device 30, the fork arm structure 20 is driven to rotate by the steering driving device 30, and the rotation of the fork arm structure 20 simultaneously causes the connected wheel 10 to rotate, so that the vehicle can rotate in different directions.

[0032] In the embodiment of the present application, the hub power assembly comprises a shell, a motor, a reducer and a reducer ventilation device; a containing cavity is formed between the motor, the shell and a hub bearing; the reducer and the reducer ventilation device are located in the containing cavity, the power output end of the motor is connected with the reducer, and the power output end of the reducer is output to the hub through the hub bearing.

[0033] In specific implementation, the hub bearing comprises a bearing inner ring and a bearing outer ring, and a rolling body is arranged between the bearing inner ring and the bearing outer ring. The bearing outer ring is connected with the hub, and the bearing inner ring is connected with the output end of the reducer.

[0034] In specific implementation, the shell can be a shell integrated with the fork arm structure. The shell, the inner shell of the motor controller, the hub and the hub bearing form a containing cavity. The motor, the reducer and the reducer ventilation device are arranged in the containing cavity.

[0035] In specific implementation, the motor can comprise a rotor assembly, a stator assembly and a rotor support. The rotor assembly is fixed on the shell. When the rotor assembly receives a driving control signal, it rotates around the stator assembly to generate a driving torque. The rotor support supports the rotor assembly, and one end of the rotor support is fixedly connected with the rotor assembly, and the other end of the rotor support is connected with the power input end of the reducer. Thus, when the rotor assembly rotates, the rotor support supports the rotor assembly to rotate synchronously, so as to transmit the driving torque to the power input end of the reducer. The power output end of the reducer is connected with the hub through the bearing outer ring of the hub bearing. The reducer can amplify the driving torque generated by the motor, and transmit the amplified driving torque to the hub to drive the wheel to rotate.

[0036] In specific implementation, the reducer can be a planetary reducer, or a reducer of other structure. Taking the planetary reducer as an example, the planetary reducer can comprise:

[0037] a sun gear as an input end of the planetary reducer;

[0038] a ring gear arranged around the sun gear;

[0039] A plurality of planetary gears are arranged around the sun gear and engaged with the sun gear and the ring gear;

[0040] A planet carrier is connected with the plurality of planetary gears and connected with the wheel hub as an output of the planetary reducer.

[0041] In a specific implementation, the sun gear is fixedly connected with a rotor support of the motor, and the rotor support can drive the sun gear to rotate when rotating. The sun gear is engaged with the planetary gears in the ring gear, so that the sun gear can drive the planetary gears to rotate when rotating. The planetary gears are fixedly connected with the planet carrier, and the planet carrier rotates when the planetary gears rotate. The planet carrier is connected with the wheel hub through a wheel hub bearing outer ring, and the wheel hub can be driven to rotate by transmitting driving torque to the wheel hub when the planet carrier rotates.

[0042] In the embodiment of the application, the air passage device of the reducer comprises a gas release valve on the housing and an air passage structure between the reducer and the wheel hub bearing.

[0043] Figure 2 It is a right view of the air passage structure, wherein part A is a sectional view along the radial direction.

[0044] Figure 3 It is a left view of the air passage structure. Figure 4 It is Figure 2 It is a sectional view along B-B direction after the air passage structure is assembled. Figure 4 In the embodiment, the motor, the wheel hub bearing and other structures on both sides of the air passage device of the reducer are omitted.

[0045] The air passage device of the reducer will be described in detail below. Figures 2 to 4 The air passage device of the reducer will be described in detail below.

[0046] Refer to Figure 2 and Figure 3 , the air passage structure 110 comprises an air passage structure body 111 and at least one notched tooth groove 112 on the outer periphery of the air passage structure body 111, and adjacent notched tooth grooves 112 are connected through tooth groove connecting parts 113. There is no notched tooth groove on the tooth groove connecting part 113.

[0047] Refer to Figure 2 and Figure 4 , an air passage groove 114 is formed between the air passage structure 110 and the housing 101; the gas release valve 115 is aligned with the tooth groove connecting part 113, and a gas passage is formed between the air passage groove 114 and the tooth groove connecting part 113.

[0048] In a specific embodiment, the shape of the air permeable structure 110 matches the shape of the accommodating cavity. The edge of the air permeable structure 110, i.e. the side wall of the tooth groove connecting portion 113, can abut against the shell 101 and be in interference fit with the shell 101, so as to fix the air permeable structure 110 in the accommodating cavity.

[0049] In an embodiment of the present application, referring to Figure 2 and Figure 3 , the cross-sectional shape of the air permeable structure 110 in the radial direction is circular, so that the side wall 116 (as shown in Figure 4 ) of the air permeable structure 110 in the axial direction is a cylindrical surface, which is in interference fit with the shell 101, so as to avoid the oil generated by the speed reducer from reaching the air release valve through the gap between the cylindrical surface and the shell 101.

[0050] In a specific embodiment, only one notch tooth groove 112 can be provided on the outer periphery of the air permeable structure body 111, or two or more notch tooth grooves 112 can be provided. The adjacent notch tooth grooves 112 are connected by the tooth groove connecting portion 113. For example, the number of notch tooth grooves 112 can be 9.

[0051] In a specific embodiment, the notch tooth grooves 112 are distributed along the axial direction of the air permeable structure body 111 and extend through the air permeable structure body 111. When the number of notch tooth grooves 112 is two or more, the gas in the speed reducer can enter the gas passage through any one or more notch tooth grooves 112. The depth of the notch tooth groove 112 can be set according to actual needs, which is not limited here. The depths of the notch tooth grooves 112 can be the same or different, which is not limited here.

[0052] In a specific embodiment, when two or more notch tooth grooves 112 are provided on the outer periphery of the air permeable structure body 111, the distance between the adjacent notch tooth grooves 112 can be the same or different. For example, when the cross-sectional shape of the air permeable structure 110 in the radial direction is circular, the outer arc length of the tooth groove connecting portion 113 between the adjacent notch tooth grooves 112 can be the same or different.

[0053] In an embodiment, in order to better block the oil generated by the speed reducer, the tooth groove connecting portion includes a first tooth groove connecting portion 113a and a second tooth groove connecting portion 113b, the outer arc length of the first tooth groove connecting portion 113a is greater than the outer arc length of the second tooth groove connecting portion 113b, and the tooth groove connecting portion aligned with the air release valve 115 is the first tooth groove connecting portion 113a.

[0054] In a specific implementation, the air release valve 115 can be installed on the housing 101 at the highest position corresponding to the air permeable structure 110. Specifically, the installation hole of the air release valve 115 can be aligned with the middle position of the first tooth groove connecting part 113a, so that the first tooth groove connecting part 113a can symmetrically shield the oil of the speed reducer from two directions, avoiding the oil reaching the air release valve.

[0055] In a specific implementation, the outer arc length of each second tooth groove connecting part 113b can be the same. The outer arc length of the first tooth groove connecting part 113a is 2 times or more than 2 times the outer arc length of the second tooth groove connecting part 113b, for example, the outer arc length of the first tooth groove connecting part 113a is 3 times the outer arc length of the second tooth groove connecting part 113b.

[0056] In a specific implementation, an air permeable groove is formed between the air permeable structure 110 and the housing 101. The air permeable groove includes two parts: one part is a first gap between the first tooth groove connecting part 113a and the housing 101, and the other part is a second gap between the air permeable structure main body 111 and the housing 101. The first gap is usually larger than the second gap. The gas in the speed reducer is discharged along the arrow direction of part A, through the first gap. Even if the oil enters the first gap, it can enter the second gap under the action of gravity, and finally slide down to the lowest position of the air permeable structure in the radial direction. Figure 2

[0057] In a specific implementation, the air permeable structure main body 111 has a center through hole 116, so that the air permeable structure main body 111 is a hollow annular structure. The power output end of the speed reducer is connected with the hub bearing through the center through hole 116. The center through hole 116 can avoid the power output end (such as the planet carrier) of the speed reducer. The shape of the center through hole 116 can be set according to actual needs.

[0058] In a specific implementation, referring to Figure 4 , the outer peripheral structure formed by the notch tooth groove 112 and the tooth groove connecting part 113 can protrude in the direction close to the motor controller in the axial direction, better fit with the housing 101, and form the air permeable groove 114. The entire air permeable structure 110 can be formed integrally.

[0059] In an embodiment of the present application, in the axial direction, the air permeable structure main body 111 can cover the outer ring of the hub bearing and expose the inner ring of the hub bearing. Specifically, the inner diameter of the air permeable structure main body 111 can be set according to the position of the hub bearing, so that the air permeable structure main body 111 can axially press the outer ring of the hub bearing, play the role of the hub bearing pressing plate, thereby eliminating the need for additional hub bearing pressing plate, reducing cost and simplifying the hub power assembly structure. ​

[0060] In specific implementation, the breather device of the speed reducer can further include an oil plug 117 located on the housing corresponding to the lowest point of the breather structure in the radial direction. The oil entering the first gap can slide down to the vicinity of the oil plug 117. After the oil plug 117 is removed, the oil in the vicinity of the oil plug can be discharged, thereby reducing the residual oil and avoiding affecting the operation of the speed reducer.

[0061] In specific implementation, the breather structure body 111 is provided with a plurality of mounting holes 118 for fixing the breather structure 110 on the housing 101. Specifically, the breather structure 110 can be fixed on the housing 101 by using countersunk screws through the mounting holes 118.

[0062] In specific implementation, referring to Figure 2 , the tooth groove connecting portion can further be provided with a plurality of gear ring mounting structures 119. The gear ring of the planetary speed reducer can be connected to the breather structure 110 through the gear ring mounting structures 119, and the planet carrier of the planetary speed reducer can pass through the central through hole of the breather structure body 111 to be connected to the hub bearing.

[0063] The breather device of the speed reducer in the embodiment of the present application can be installed by first installing the air release valve 115 and the oil plug 117 on the housing, then aligning the first tooth groove connecting portion of the breather structure with the air release valve 115, and finally completing the installation of the breather structure through the mounting holes 118. The installation process is convenient. In addition, the breather structure is simple in structure and easy to process, which not only retains the air-breathing effect but also prevents oil leakage.

[0064] The embodiment of the present application further provides an automobile, which can include any one of the hub power assemblies.

[0065] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A wheel hub powertrain, characterized in that: include: A housing, a motor, a reducer and a reducer ventilation device; a receiving cavity is formed between the motor, the housing and the hub bearing; The reducer and the reducer ventilation device are located in the accommodating cavity, and the reducer is connected to the power output end of the motor; the power output end of the reducer is output to the wheel hub through the wheel hub bearing; wherein: The reducer ventilation device includes: an air release valve located on the housing, and a ventilation structure located between the reducer and the wheel hub bearing; The vent structure comprises: a vent structure body, and at least one notched tooth groove located on the outer periphery of the vent structure body, wherein adjacent notched tooth grooves are connected by a tooth groove connecting portion; a vent groove is formed between the vent structure and the shell; the air release valve is aligned with the tooth groove connecting portion, and forms a gas channel between the air release valve and the vent groove; In which, the cross-sectional shape of the air-permeable structure in the radial direction is circular; the tooth groove connection part includes: a first tooth groove connection part and a second tooth groove connection part, the outer arc length of the first tooth groove connection part is greater than the outer arc length of the second tooth groove connection part; the tooth groove connection part aligned with the air release valve is the first tooth groove connection part.

2. The wheel hub powertrain according to claim 1, wherein: The air-permeable structure body has a central through hole, and the power output end of the reducer is connected to the hub bearing through the central through hole.

3. The wheel hub powertrain according to claim 1, wherein: The notched tooth grooves are distributed along the axial direction of the air-permeable structural body and penetrate the air-permeable structural body.

4. The wheel hub powertrain according to claim 1, wherein: In the axial direction, the air-permeable structural body covers the outer ring of the hub bearing and exposes the inner ring of the hub bearing.

5. The wheel hub powertrain according to claim 1, wherein: The arc length of the first tooth groove connecting portion is three times the arc length of the second tooth groove connecting portion.

6. The wheel hub powertrain according to claim 1, wherein: The side wall of the first tooth groove connecting portion abuts against the shell and is interference fit with the shell.

7. The wheel hub powertrain according to claim 1, wherein: The reducer ventilation device also includes: The oil plug is located on the housing and corresponds to the lowest point of the air-permeable structure in the radial direction.

8. The wheel hub powertrain according to claim 1, wherein: The main body of the air-permeable structure is provided with a plurality of mounting holes for fixing the air-permeable structure on the shell.

9. An automobile, characterized in that: A wheel hub power assembly comprising any one of claims 1 to 8.

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