An exhaust structure for a wheel hub and a wheel hub for electric vehicles

Abstract

This invention belongs to the technical field of electric vehicle parts, specifically referring to an exhaust structure for a wheel hub and an electric vehicle wheel hub. A wire-passing hole is provided on the fixed shaft of the wheel hub motor, through which the lead wire of the wheel hub motor extends. The lead wire includes several wire cores and an outer sheath. The outer sheath covers the outside of the wire cores. A separation chamber is provided inside the branch connector at the outer end of the lead wire. A first end, a second end, and a third end are provided around the periphery of the separation chamber. The wire cores are inserted into the first end, pass through the separation chamber, and then extend from the second end. The gap channel between the wire cores leads to the separation chamber, and the exhaust hole at the third end connects to the external environment and the separation chamber. Gas and oil inside the wheel hub can be conducted to the separation chamber through the gap channel between the wire cores, and then released into the external environment through the separation chamber.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle parts technology, specifically referring to an exhaust structure for a wheel hub and an electric vehicle wheel hub. Background Technology

[0002] During operation, the air pressure inside the hub motor of an electric vehicle increases with temperature, causing an imbalance in air pressure between the inside and outside of the motor. Hot air inside the hub is discharged through the motor wire core and the oil seal on the end cover. When the temperature inside the hub decreases, the air pressure inside the motor will be lower than the outside air pressure. Moisture in the air will enter the motor through the gap between the motor wire core and the insulation layer, leading to water ingress and rust inside the motor.

[0003] In addition, some high-end hub motors are usually filled with oil to cool the stator assembly. When the air pressure inside and outside the hub is unbalanced, the oil will also be discharged outward along the motor wire core, affecting the service life of the motor.

[0004] Application number CN202021033082.7 discloses a hub motor with a drying and ventilating structure, which achieves air pressure balance inside and outside the hub by adding a valve component (drying and ventilating structure) that is ventilated but not liquid-permeable to the hub end cover.

[0005] Its disadvantages are as follows:

[0006] 1. The air-permeable but liquid-permeable valve component is mounted on the wheel hub end cover. During daily use, it is subject to bumps and knocks, which can lead to failure.

[0007] 2. Drill holes in the wheel hub end cap and then install a valve component that is breathable but not liquid-permeable; the drilling of the end cap requires high precision and adds an extra step, increasing costs; there is a risk of leakage between the valve component and the hole in the end cap. Summary of the Invention

[0008] The purpose of this invention is to provide an exhaust structure and electric vehicle wheel hub that are simple in structure, have good waterproof performance, and are low in cost.

[0009] The objective of this invention is achieved as follows:

[0010] An exhaust structure for a wheel hub includes a fixed shaft mounted on a wheel hub motor of an electric vehicle. The fixed shaft is provided with a wire through hole, through which the lead wire of the wheel hub motor extends.

[0011] The lead wire includes several core wires and an outer sheath; the outer sheath covers the outside of several core wires; the outer wall of the outer sheath and the wire hole are sealed together; a gap channel is formed between the core wires, and one end of the gap channel leads to the inner cavity of the hub motor.

[0012] The outer end of the lead wire extends upward into the interior of the locomotive housing;

[0013] An exhaust connector is installed at the outer end of the lead wire. A separation chamber is provided inside the exhaust connector. A first connector, a second connector, and a third connector are provided around the periphery of the separation chamber.

[0014] The outer sheath and the wire core are inserted into the first connector, and the outer sheath and the first connector are sealed.

[0015] The wire core passes through the separation chamber and then extends out from the second connector; the wire core and the second connector are sealed.

[0016] The gap between the wire cores leads to the separation chamber.

[0017] Preferably, the third connector is provided with a valve component that is breathable but not liquid-permeable, and the separation chamber communicates with the external environment through the valve component.

[0018] Preferably, the exhaust connector includes a branch connector and a cover; the cover is wrapped around the outside of the branch connector;

[0019] The branch connector has a separation chamber inside, and a first end, a second end, and a third end of the branch connector are arranged around the separation chamber; the outer sheath and the wire core are inserted into the first end, and the outer sheath and the first end are sealed; the wire core extends out of the second end, and an exhaust hole is provided on the third end.

[0020] The present invention can be further configured such that the outer end of the lead wire extends into the inside of the controller of the electric vehicle; after the wire core extends out of the second connector, it is connected to the circuit board of the controller.

[0021] The present invention can be further configured such that the second end is provided with a rubber sleeve, and the rubber sleeve is pre-formed with a plurality of through holes, each corresponding to a wire core; the wire core passes through the corresponding through hole.

[0022] The present invention can be further configured such that a clamping ring is provided on the outside of the rubber sleeve body one; and a cover wraps around the rubber sleeve body one.

[0023] The present invention can be further configured such that the outer wall of the outer sheath and the thread hole are sealed with glue.

[0024] The present invention can be further configured such that the threading hole includes an inclined section, the inner wall of the inclined section is provided with a stepped portion, and the outer side of the stepped portion is provided with an internal thread portion.

[0025] The second rubber sleeve is circular; the second rubber sleeve is fitted onto the outside of the outer sheath and abuts against the step.

[0026] A copper sleeve is fitted onto the outside of the outer leather sleeve and abuts against the second rubber sleeve; the copper sleeve tightens the outer leather sleeve;

[0027] A nut sleeve is fitted onto the outside of the outer sheath and abuts against the copper sleeve; the nut sleeve is screwed into the internal thread and presses against the rubber sleeve body.

[0028] The invention can be further configured such that the threading hole is inclinedly arranged on the fixed shaft; a protective spring is fitted on the outer side of the outer sheath; one end of the protective spring is embedded in the inclined section of the threading hole and fixed, and the other end of the protective spring extends to the outer side of the threading hole.

[0029] An electric vehicle wheel hub, including the aforementioned exhaust structure.

[0030] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0031] The fixed shaft of the present invention is provided with an inclined section, the inner wall of the inclined section is provided with a stepped portion, and the outer side of the stepped portion is provided with an internal thread portion; the nut is screwed into the internal thread portion and presses the rubber sleeve body two, so that the outer sheath and the thread hole can be effectively sealed and water will not enter.

[0032] The outer end of the lead wire of the present invention extends upward into the interior of the electric vehicle housing, for example, directly connected to the interior of the controller. These parts are in a relatively high position and generally will not come into contact with water. A branch connector is installed at the outer end of the lead wire, and a separation chamber is provided inside the branch connector. Gas and oil inside the hub can be conducted to the separation chamber through the gap channel between the wire cores, and then released into the external environment through the separation chamber.

[0033] The protective spring of this invention can effectively prevent the outer sheath from being scratched by the fixed shaft and protect the internal wire core. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of an electric vehicle wheel hub.

[0035] Figure 2 This is a schematic diagram of the outer end of the lead wire.

[0036] Figure 3 It is a sectional view of the outer end of the leader line.

[0037] Figure 4 This is an exploded view of the components at the outer end of the lead wire.

[0038] Figure 5 This is one of the schematic diagrams showing the fit between the fixed shaft and the lead wire.

[0039] Figure 6 This is the second schematic diagram showing the connection between the fixed shaft and the lead wire.

[0040] The meaning of the labels in the diagram:

[0041] 10-Rim; 20-Fixed Shaft; 30-Lead-out Wire; 40-End Cover 1; 80-Magnetic Steel Sheet; 90-End Cover 2; 100-Electric Vehicle Wheel Hub;

[0042] 21-Threading hole; 22-Angled section; 221-Stepped section; 222-Internal thread section;

[0043] 301 - Core wire; 302 - Protective spring; 304 - Rubber sleeve II; 305 - Copper sleeve; 306 - Nut sleeve; 307 - Outer sheath; 310 - Glue; 311 - Stator assembly;

[0044] 3000 - Exhaust connector; 3000A - First connector; 3000B - Second connector; 3000C - Third connector;

[0045] 3011 - Enclosure; 3011A - First end of the enclosure; 3011B - Second end of the enclosure; 3011C - Center hole portion of the enclosure;

[0046] 3012 - Branch connector; 3012A - First end; 3012B - Second end; 3012C - Third end; 3012D - Separation chamber; 3012C1 - Exhaust port;

[0047] 3013 - A valve component that is breathable but impermeable to liquid; 3013A - Hollow pores; 3013B - A polymer membrane layer;

[0048] 3014 - Clamping ring; 3015 - Rubber sleeve body one; 3015A - Through hole. Detailed Implementation

[0049] The present invention will be further described below with reference to specific embodiments:

[0050] Example 1, as Figure 1-6 An exhaust structure for a wheel hub includes a fixed shaft 20, which is mounted on a wheel hub motor of an electric vehicle. The fixed shaft is provided with a wire hole 21, through which the lead wire 30 of the wheel hub motor extends.

[0051] The lead wire 30 includes several wire cores 301 and an outer sheath 307; the outer sheath 307 covers the outside of several wire cores 301; the outer wall of the outer sheath 307 and the wire hole 21 are sealed together; there are generally six wire cores 301, three thick wires corresponding to the U, V, and W wires of the stator winding, and three thin wires corresponding to Hall sensors, etc.; currently, some models also directly install the electric vehicle controller on the stator assembly inside the wheel hub, in which case the power line of the core wire is connected to the battery, and the signal line of the core wire is bidirectionally connected to the external central control device.

[0052] The outer end of the lead wire 30 extends upward into the interior of the locomotive housing, thus avoiding direct exposure to the environment and improving the protective effect.

[0053] An exhaust connector 3000 is installed at the outer end of the lead wire 30. A separation chamber 3012D is provided inside the exhaust connector 3000. A first connector 3000A, a second connector 3000B, and a third connector 3000C are provided around the separation chamber 3012D.

[0054] The outer sheath and the wire core are inserted into the first connector 3000A, and the outer sheath and the first connector 3000A are sealed.

[0055] The wire core 301 passes through the separation chamber 3012D and then extends out from the second connector 3000B; the wire core 301 and the second connector 3000B are sealed.

[0056] The gap channel between the wire cores 301 is connected to the separation chamber 3012D.

[0057] The third connector 3012C is provided with a valve component 3013 that is breathable but not liquid-permeable, and the separation chamber 3012D communicates with the external environment through the valve component 3013.

[0058] Preferably, the exhaust connector 3000 includes a branch connector 3012 and a cover 3011; the cover 3011 wraps around the outside of the branch connector 3012; the first connector 3000A and the first end 3011A of the cover form a double seal on the outer sheath 307.

[0059] The branch connector 3012 has a separation chamber 3012D inside, and a first end 3012A, a second end 3012B, and a third end 3012C are provided on the periphery of the separation chamber 3012D. The branch connector 3012 can also be configured as a tee shape or a spherical shape. When the branch connector 3012 is spherical, the first end 3012A, the second end 3012B, and the third end 3012C are three holes distributed on the surface of the spherical shape.

[0060] The end of the outer sheath is inserted into the first end 3012A and sealed;

[0061] The wire core 301 is inserted into the first end 3012A, passes through the separation chamber 3012D, and then extends from the second end 3012B. The wire core 301 and the second end 3012B are sealed. The wire core 301 is circular, and multiple wire cores 301 form a gap channel. One end of the gap channel leads to the inner cavity of the hub motor, and the other end of the gap channel leads to the separation chamber 3012D. Air and oil are trapped in the separation chamber and cannot pass through the second end 3012B, ensuring that the stability of the controller is not affected.

[0062] The threading hole 21 is located on the fixed shaft. Since the amount of oil inside the hub (usually silicone oil, which is non-conductive) is relatively small, it will not submerge the fixed shaft. When the hub rotates, the oil will splash into the gap channel between the core wires. This invention no longer seeks to block the gap channel between the core wires, but instead chooses to use the gap channel as an exhaust channel. The air and a small amount of oil in the hub will be discharged upward along the gap channel and then processed through the branch connector 3012.

[0063] The air-permeable but liquid-impermeable valve component 3013 can be purchased from the market. Its core function is to allow gas to pass through to the external environment through a layer of polymer membrane 3013, but to prevent liquid from passing through. This can completely prevent oil leakage and prevent water vapor from entering.

[0064] The present invention can be further configured such that the outer end of the lead wire 30 extends into the inside of the controller of the electric vehicle; after the wire core 301 extends out of the second end 3012B, it is connected to the circuit board of the controller.

[0065] The present invention can be further configured such that the second end 3012B is provided with a rubber sleeve 3015, and a plurality of through holes 3015A are pre-formed on the rubber sleeve 3015, and the through holes correspond one-to-one with the wire core 301; the wire core 301 passes through the corresponding through hole 3015A.

[0066] The present invention can be further configured such that a clamping ring 3014 is provided on the outside of the rubber sleeve 3015. The clamping ring 3014 can shrink the rubber sleeve 3015, so that the rubber sleeve 3015 can seal the gap channel between the wire cores 301.

[0067] The present invention can be further configured such that the external part of the branch connector 3012 is wrapped with a cover 3011; the cover 3011 also wraps the rubber sleeve 3015 to achieve a complete seal.

[0068] The invention can be further configured such that the outer wall of the outer sheath 307 and the wire hole 21 are sealed with adhesive 310. After the adhesive cures, the lead wire is fixed inside the hub and sealed.

[0069] The present invention can be further configured such that the thread hole 21 includes an inclined section 22, the inner wall of the inclined section is provided with a stepped portion 221, and the outer side of the stepped portion is provided with an internal thread portion 222.

[0070] Rubber sleeve 2 304 is in the shape of a ring; rubber sleeve 2 304 is fitted onto the outside of outer sheath 307 and abuts against step portion 221;

[0071] The copper sleeve 305 is fitted onto the outside of the outer leather sleeve 307 and abuts against the rubber sleeve body 304; the copper sleeve tightens the outer leather sleeve 307;

[0072] Nut sleeve 306 is fitted outside the outer sleeve 307 and abuts against the copper sleeve 305; the nut sleeve 306 is screwed into the internal thread 222 and presses against the rubber sleeve body 304.

[0073] When the nut sleeve is screwed into the internal thread, it presses against the second rubber sleeve. The front part of the second rubber sleeve abuts against the stepped part 221. The second rubber sleeve is deformed by external force and presses against the outer sheath 307. This design seals the outer sheath and the wire hole 21. The outer sheath 307 is fixed by the copper sleeve to ensure the stability and sealing of the lead wire and prevent water ingress. The nut sleeve and the second rubber sleeve further fix the lead wire to the outside of the hub and improve the sealing performance.

[0074] The invention can be further configured such that the threading hole 21 is inclinedly disposed on the fixed shaft; a protective spring 302 is fitted on the outer side of the outer sheath 307; one end of the protective spring is embedded in and fixed to the inclined section 22 of the threading hole 21, and the other end of the protective spring extends to the outer side of the threading hole 21. The threading hole 21 has burrs that could cut the outer sheath; the design of the protective spring 302 can isolate the burrs from the threading hole. The protective spring 302 is directly inserted into the threading hole and can be pulled out with considerable force.

[0075] Example 2 is essentially the same as Example 1, except that the third connector 3012C is directly exposed; that is, a vent 3012C1 is provided on the third end 3012C, which directly communicates with the external environment and the separation chamber 3012D. In this scheme, the oil is temporarily stored in the separation chamber 3012D, and the air is directly released into the environment. After the wheel hub cools down, the oil is drawn back into the wheel hub. The waterproof function of this scheme is based on the fact that the electric vehicle shell can form a certain barrier to prevent water vapor from directly contacting the branch connector. However, the waterproof effect is poor when the electric vehicle shell is damaged, when driving through water, or in foggy or rainy weather. When the amount of oil entering the gap channel is too large, oil leakage may also occur.

[0076] This application claims protection for an electric vehicle wheel hub, including the aforementioned exhaust structure.

[0077] The rubber parts involved in this application that come into direct contact with oil are generally made of fluorinated rubber. Ordinary rubber will swell, crack, lose elasticity, or even disintegrate if it comes into contact with oil for a long time.

[0078] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A hub exhaust structure, comprising a fixed shaft (20) mounted on a hub motor of an electric vehicle, characterized in that, The fixed shaft is provided with a wire hole (21), and the lead wire (30) of the hub motor extends out of the wire hole (21). The lead wire (30) includes several cores (301) and an outer sheath (307); the outer sheath (307) covers the outside of several cores (301); the outer wall of the outer sheath (307) and the through hole (21) are sealed together; The outer end of the lead wire (30) extends upward into the interior of the locomotive housing; An exhaust connector (3000) is installed at the outer end of the lead wire (30). A separation chamber (3012D) is provided inside the exhaust connector (3000). A first connector (3000A), a second connector (3000B), and a third connector (3000C) are provided around the separation chamber (3012D). The outer sheath and the wire core are inserted into the first connector (3000A), and the outer sheath and the first connector (3000A) are sealed. The core (301) passes through the separation chamber (3012D) and then extends out from the second connector (3000B); the core (301) and the second connector (3000B) are sealed; The gap channel between the wire cores (301) leads to the separation chamber (3012D); The third connector (3000C) is provided with a valve component (3013) that is breathable but not liquid-permeable, and the separation chamber (3012D) communicates with the external environment through the valve component (3013). The exhaust connector (3000) includes a branch connector (3012) and a cover (3011); the cover (3011) is wrapped around the outside of the branch connector (3012); The branch connector (3012) is provided with the separation chamber (3012D), and the first end (3012A), the second end (3012B) and the third end (3012C) of the branch connector (3012) are provided on the periphery of the separation chamber (3012D). The end of the outer sheath is inserted into the first end (3012A) and sealed; The core (301) and the core are inserted into the first end (3012A), and the outer sheath and the first end (3012A) are sealed; the core (301) extends out to the second end (3012B); the third end (3012C) is provided with an exhaust hole (3012C1).

2. The exhaust structure of a wheel hub according to claim 1, characterized in that, The outer end of the lead wire (30) extends into the controller of the electric vehicle; after the wire core (301) extends out to the second end (3012B), it is connected to the circuit board of the controller.

3. The exhaust structure of a wheel hub according to claim 1, characterized in that, The second end (3012B) is provided with a rubber sleeve (3015), and a number of through holes (3015A) are pre-formed on the rubber sleeve (3015). The through holes correspond one-to-one with the wire core (301). The wire core (301) passes through the corresponding through hole (3015A). The cover (3011) also wraps the rubber sleeve (3015).

4. The exhaust structure of a wheel hub according to claim 3, characterized in that, A clamping ring (3014) is provided on the outside of the rubber sleeve (3015).

5. The exhaust structure of a wheel hub according to claim 1, characterized in that, The outer wall of the outer sheath (307) and the thread hole (21) are sealed with glue (310).

6. The exhaust structure of a wheel hub according to claim 1, characterized in that, The wire hole (21) includes an inclined section (22), the inner wall of which is provided with a stepped portion (221), and the outer side of the stepped portion is provided with an internal thread portion (222). Rubber sleeve two (304) is in the shape of a ring; rubber sleeve two (304) is fitted on the outside of the outer leather sleeve (307) and abuts against the step part (221). The copper sleeve (305) is fitted onto the outside of the outer leather sleeve (307) and abuts against the rubber sleeve body (304); the copper sleeve tightens the outer leather sleeve (307). Nut sleeve (306) is fitted outside the outer sleeve (307) and abuts against the copper sleeve (305); the nut sleeve (306) is screwed into the internal thread (222) and presses the rubber sleeve body two (304).

7. The exhaust structure of a wheel hub according to claim 1, characterized in that, The threading hole (21) is inclinedly arranged on the fixed shaft; a protective spring (302) is fitted on the outer side of the outer sheath (307); one end of the protective spring is embedded in the inclined section (22) of the threading hole (21) and fixed, and the other end of the protective spring extends to the outer side of the threading hole (21).

8. An electric vehicle wheel hub, characterized in that, Includes the exhaust structure as described in any one of claims 1-7.

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