CN115727072A - Hub motor assembly - Google Patents

Abstract

The invention discloses a hub motor assembly, which comprises a shell, a parking locking mechanism and a brake drum which are sequentially arranged from the radial outer side to the radial inner side, wherein the parking locking mechanism comprises a parking gear arranged on the radial outer side of the brake drum, an actuator arranged on the radial inner side of the shell and a parking piece, and the parking piece is movably inserted in the actuator along the radial direction and can be close to or far away from the parking gear along the radial direction, so that the parking piece and the parking gear are switched between an engagement state and a disengagement state; the actuator is configured to move the parking member in a radial direction and selectively lock the parking member in the engaged state or the disengaged state. The hub motor assembly system is high in integration degree and small in radial space, so that the problem that the conventional parking locking mechanism cannot be arranged inside an in-wheel driving system can be solved.

Description

Hub motor assembly

Technical Field

The invention relates to the technical field of vehicles, in particular to a hub motor assembly integrated with a parking locking mechanism.

Background

An In Wheel Drive unit (IWD) is understood to be a brake integrated In the Wheel hub Drive. The in-wheel drive unit may also be referred to as a hub drive assembly. The in-wheel drive system generally includes a drive motor, a planetary gear reducer, a wheel bearing, a brake system, and the like, which are located in an in-wheel space, and a wheel can be directly driven by the drive motor without a transmission and a drive shaft.

The parking lock mechanism applied to the Central Transmission (Central Transmission) of the related art cannot be applied to the in-wheel drive unit. This is because the conventional parking lock mechanism occupies a large space and cannot be directly integrated into the in-wheel drive unit.

Fig. 1 is a schematic structural view of a conventional parking lock mechanism. The parking lock mechanism 900 of fig. 1 includes a ratchet 901, a pawl 902, and a cam mechanism 903. Wherein the ratchet 901 is arranged on a rotating member (not shown in the drawings), such as a gearbox output shaft. The pawl 902 can engage into the outer teeth of the ratchet 901 to lock the ratchet 901 and thus the rotating member. The pawl 902 can be actuated by the cam mechanism 903 and rotated about an axis of rotation 904 to engage the pawl 902 with the ratchet 901 for park lock or to allow the pawl 902 to disengage from the ratchet 901 for park release. It is obvious that the structure of the parking lock mechanism in fig. 1 has a corresponding complexity and requires a corresponding installation space.

Furthermore, parking requires complex monitoring and diagnostic logic. If the lock and brake are integrated, degradation or defects in any one of the components common to the two mechanisms can affect parking performance.

Therefore, in order to solve the above problems, it is necessary to redesign the existing in-wheel motor assembly.

Disclosure of Invention

The invention mainly aims to provide a hub motor assembly integrated with a parking locking mechanism, which can solve the problem that the existing parking locking mechanism cannot be arranged in an in-wheel driving system.

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.

In order to achieve the purpose, the invention adopts the following technical scheme:

a hub motor assembly comprises a shell, a parking locking mechanism and a brake drum, wherein the shell, the parking locking mechanism and the brake drum are sequentially arranged from the radial outer side to the radial inner side;

wherein the parking lock mechanism includes a parking gear provided radially outside the brake drum, an actuator provided radially inside the housing, and a parking member;

the parking piece is movably inserted in the actuator along the radial direction and can be close to or far away from the parking gear along the radial direction, so that the parking piece and the parking gear are switched between an engagement state or a disengagement state;

the actuator is configured to move the parking member in a radial direction and selectively lock the parking member in the engaged state or the disengaged state.

Optionally, in some embodiments, the in-wheel motor assembly further comprises a motor, a stator of the motor being disposed radially inside the housing and axially adjacent to the actuator.

Optionally, in some embodiments, the parking gear is screwed, welded or integrally fixed to the brake drum.

Alternatively, in some embodiments, the parking gear may be formed with a plurality of engaging teeth that protrude to a radially outer side of the parking gear or an axial one side of the parking gear.

Optionally, in some embodiments, the actuator comprises an actuating member and a lock member, wherein:

the actuating piece is rotatably arranged and connected to the parking piece so as to drive the parking piece to move along the radial direction;

the lock member is selectively connectable to the parking member to lock the parking member in the engaged state or the disengaged state.

Optionally, in some embodiments, the actuator further comprises a locking spring for urging the locking member to be connected to the parking member.

Optionally, in some embodiments, the parking member has a first locking hole and a second locking hole located radially outward of the first locking hole;

the lock member is engageable with the first lock hole or the second lock hole, respectively, to lock the parking member in the disengaged state and the engaged state.

Optionally, in some embodiments, the parking member has a first aligning groove and a second aligning groove located radially outside the first aligning groove, and the parking member is connected with the actuating member by means of the first aligning groove or the second aligning groove;

the actuating member can drive the parking member to switch between the disengaged state and the engaged state by switching between the first aligning groove and the second aligning groove.

Optionally, in some embodiments, the actuator further comprises an actuator housing divided into a first receiving cavity, and a second receiving cavity and a third receiving cavity disposed on the same side of the first receiving cavity;

the parking piece is accommodated in the first accommodating cavity in a manner of being capable of extending and contracting along the radial direction relative to the shell;

the actuating piece is rotatably arranged in the second accommodating cavity;

the locking piece is arranged in the third accommodating cavity in a reciprocating mode relative to the shell.

Optionally, in some embodiments, the actuator further comprises:

the servo motor is used for driving the actuating piece to rotate;

a relay selectively engageable with the latch member to disconnect the latch member from the parking member.

Compared with the prior art, the hub motor assembly provided by the invention has the advantages that by improving the arrangement mode of the shell, the brake drum and the parking locking mechanism, the parking locking mechanism can be integrated in the radial area between the shell and the brake drum, the integration degree of the hub motor assembly is improved, and the problem that the existing parking locking mechanism cannot be arranged in a wheel drive system is solved. Further, by integrating the parking gear to the outer peripheral surface of the brake drum, the brake performance and the parking lock performance can be prevented from affecting each other. According to the invention, the layout positions of the parking piece, the parking gear and the actuator are improved, and the structure of the actuator is improved, so that the integration degree of the parking locking mechanism can be improved, and the space size of the parking locking mechanism is reduced. Finally, the parking lock mechanism of the present invention can be used independently of hydraulic components and in a hydraulic component-free brake system.

Drawings

Fig. 1 is a schematic structural view of a known parking lock mechanism.

Fig. 2 is a structural diagram of the hub motor assembly according to an embodiment of an aspect of the present invention, which shows an arrangement of the housing, the brake drum and the parking lock mechanism and a structure of the parking lock mechanism.

Fig. 3 is an architecture diagram of the actuator of fig. 2.

Fig. 4 is a first cross-sectional view of the parking lock mechanism of fig. 2.

Fig. 5 is a second cross-sectional view of the parking lock mechanism of fig. 2.

Fig. 6 is a schematic structural view of the parking gear in fig. 2.

Fig. 7 is a sectional view of the parking gear and the brake drum of fig. 2 in an assembled state.

Fig. 8 is a schematic view of the parking lock mechanism in fig. 2 in a parking state, mainly showing the arrangement of the parking member, the actuator and the lock member in the parking state.

Fig. 9 is a schematic view of the parking lock mechanism in fig. 2 in a released state, mainly showing the arrangement of the parking member, the actuator member, and the lock member in the released state.

Fig. 10 is a schematic diagram of a switching process of the parking lock mechanism in the parking state and the release state in fig. 2, which mainly shows the arrangement of the parking member, the actuator member, and the lock member during the switching process.

The reference numbers in the above figures are as follows:

parking locking mechanism 100 for hub motor assembly 1

Housing 200 brake 300

Motor 400 output shaft 500

Parking gear 30 parking element 20

Actuator 10 brake drum 301

Brake disc 302 stator 401

Rotor 402 rotor holder 403

Working part 310 of meshing tooth 31

First aligning groove 211 of the mounting part 320

Second alignment groove 212 first locking hole 221

Second locking hole 222 fixes plate 101

A first receiving cavity 111 and a second receiving cavity 112

The third receiving cavity 113 for the actuator 12

Guide part 131 of lock 13

The locking portion 132 locks the spring 14

Actuator housing 11

Detailed Description

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. Furthermore, the embodiments described in the detailed description are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding and is in no way limiting. Furthermore, the embodiments described in the detailed description are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 2 to 10, fig. 2 mainly shows the overall structure and arrangement of the hub motor assembly of the present invention. Fig. 3 to 5 mainly reveal the structure of the actuator 10, wherein fig. 4 and 5 can be seen substantially from the directionsbase:Sub>A-base:Sub>A and B-B illustrated in fig. 3. Fig. 6 to 7 mainly show the structure of the parking gear 30, and fig. 8 to 10 mainly show the structure of the parking lock mechanism 100 in various operating states.

In order to solve the problem that the conventional parking locking mechanism 100 cannot be integrated in a wheel, the invention provides a wheel hub motor assembly 1, wherein the wheel hub motor assembly 1 comprises the parking locking mechanism 100, a shell 200, a brake 300 and a motor 400.

Referring to fig. 2, a radially inner side of the housing 200 defines an installation space in which the parking lock mechanism 100, the motor 400, and the brake 300 are installed.

In the present embodiment, the brake 300 and the parking lock mechanism 100 are located on the same axial side of the motor 400, and the parking lock mechanism 100 is disposed radially between the housing 200 and the brake 300.

Referring to fig. 2, the housing 200 includes a first section 201 and a second section 202 that are adjacent to each other in the axial direction, wherein the motor 400 is disposed radially inward of the first section 201, and the parking lock mechanism 100 and the brake 300 are disposed radially inward of the second section 202.

In some embodiments, the hub motor assembly 1 further includes a speed reducer and an output shaft 500, and the speed reducer and the output shaft 500 are both located at the radial inner side of the casing 200.

Specifically, the motor 400, the speed reducer and the output shaft 500 are coaxially arranged, so that the space required by the in-wheel motor assembly 1 in the wheel is small.

Referring to fig. 2, the motor 400 further includes a stator 401 and a rotor 402. The stator 401 is mounted on the radial inner side of the housing 200, the rotor 402 is located on the radial inner side of the stator 401 and can rotate relative to the stator 401, and the radial inner side of the rotor 402 is fixed on a rotor bracket 403 and is torsionally mounted on the output shaft 500 through the rotor bracket 403.

In a specific embodiment, the rotational drive of the motor 400 is transmitted to the wheels through the rotor 402, the rotor bracket 403, the reducer, and the output shaft 500 in this order.

Referring to fig. 2, the brake 300 includes a brake drum 301 and a brake disc 302. The brake drum 301 and the brake disc 302 are axially opposite to each other, and the outer circumferential surface of the brake disc 302 is in friction fit with the inner circumferential surface of the brake drum 301, so that braking is achieved. The brake drum 301 rotates with the wheel, which is locked when the brake drum 301 is locked.

Referring to fig. 2, the parking lock mechanism 100 includes a parking gear 30, a parking member 20, and an actuator 10, which are sequentially arranged from a radially inner side to a radially outer side. Wherein the parking gear 30 is disposed radially outward of the brake drum 301. The actuator 10 is disposed radially inside the housing 200 and axially adjacent to the stator 401 of the motor 400. The radially outer side of the parking member 20 is housed in the actuator 10 and is movable radially closer to or away from the parking gear 30, thereby switching both the parking member 20 and the parking gear 30 between the engaged state and the disengaged state. The actuator 10 is used to move the parking member 20 in the radial direction and to selectively lock the parking member 20 in the engaged state or the disengaged state.

In the present invention, it is noted that: firstly: the engaged state (which may also be referred to as a parking state) is a form-locking connection between the radially inner side of the parking element 20 and the radially outer side of the parking gear 30, so that the rotational movement of the parking gear 30 is locked. The disengaged state (which may also be referred to as a released state or a parking released state) is a state in which the form-locking connection between the radially inner side of the parking element 20 and the radially outer side of the parking gear 30 is released, so that the parking gear 30 can rotate freely.

Secondly, the method comprises the following steps: in the invention, the radial direction, the axial direction and the circumferential direction refer to the radial direction, the axial direction and the circumferential direction of the in-wheel motor assembly 1.

A specific embodiment of the parking lock mechanism 100 of the present invention will be described below with further reference to fig. 2 to 10.

First, referring to fig. 3 to 5 together, the actuator 10 is provided with an actuator housing 11 (hereinafter, may also be simply referred to as a housing 11), an actuating member 12, and a lock member 13.

As shown in fig. 3 to 5, the actuator housing 11 has a first receiving cavity 111, and a second receiving cavity 112 and a third receiving cavity 113 disposed on the same side of the first receiving cavity 111 and adjacent to the guide cavities, respectively. The first receiving cavity 111 is used for receiving the parking member 20, the third receiving cavity 113 is used for receiving the locking member 13, and the second receiving cavity 112 is used for receiving the actuating member 12.

In a preferred embodiment, referring to fig. 3, 4 and 5, the second receiving cavity 112 and the third receiving cavity 113 are adjacently disposed side by side in an axial direction of the parking gear 30.

Wherein the first receiving cavity 111 can provide radial guidance for the parking member 20. That is, the parking member 20 is accommodated in the first accommodation chamber 111 so as to be movable in the radial direction relative to the parking member 20 but not movable in both the axial direction and the circumferential direction. More specifically, the first housing cavity 111 also prevents the parking member 20 from rattling in the axial and circumferential directions.

In a preferred embodiment, a radially extending radial guide groove is formed on an inner wall of the first receiving cavity 111, and the parking member 20 is slidably disposed in the radial guide groove.

Wherein the third receiving cavity 113 can provide a guiding function for the locking member 13. In practical implementation, the inner wall of the third receiving cavity 113 extends to form a guide groove capable of forming a sliding connection structure with the locking member 13.

It should be noted that the division of the actuator housing 11 into chambers does not affect the connection of the parking member 20 to the locking member 13 and/or the actuating member 12. For example, the side walls of the plurality of cavities may be provided with hollow structures such as openings or holes to achieve communication between the plurality of cavities.

For example, referring to fig. 1 and 5, in the present embodiment, the first receiving cavity 111 is separated from the second receiving cavity 112 and the third receiving cavity 113 by a fixing plate 101. A radial guide groove is formed on one side of the fixing plate 101 facing the first receiving cavity 111, and hollow structures are respectively formed in regions of the fixing plate 101 corresponding to the second receiving cavity 112 and the third receiving cavity 113.

In this embodiment, the actuator housing 11 may be a separately provided housing component, in which case the housing can be secured to the housing 200 using fasteners. Referring to fig. 2, in the present embodiment, the actuator housing 11 is fixed to the housing 200 by bolts.

In other embodiments, the actuator housing 11 may be integrally provided with the housing 200.

As shown in fig. 3 to 5, the parking member 20 is a plate-shaped member, and the longitudinal direction of the parking member 20 is parallel to the radial direction of the parking gear 30, and the width direction of the parking member 20 is parallel to the axial direction of the parking gear 30.

As shown in fig. 3 to 5, a radially outer side of the parking member 20 is inserted into the first receiving cavity 111 of the actuator housing 11 so as to be relatively movable in a radial direction with respect to the actuator housing 11.

Further, by the radial movement of the parking member 20, the parking member 20 is moved radially closer to or farther from the parking gear 30, and thus engagement or disengagement with the parking gear 30 can be achieved. That is, by the radial movement of the parking member 20, the engaged state and the released state between the parking member 20 and the parking gear 30 can be switched.

Specifically, the parking member 20 has a radial extension smaller than the radial depth of the first receiving cavity 111, so as to ensure that the parking member 20 can be completely received inside the first receiving cavity 111 in a disengaged state (in which the parking member 20 needs to be away from the parking gear 30). With this arrangement, the radial space size of the parking lock mechanism in the disengaged state can be reduced.

As shown in fig. 4 to 5, a first aligning groove 211 and a second aligning groove 212 are formed on the radially outer side of the parking member 20 for connecting the parking member 20 and the actuating member 12.

Specifically, the second aligning groove 212 is located radially outward of the first aligning groove 211. When the parking member 20 is connected to the actuator 12 by means of the second aligning groove 212 or the first aligning groove 211, the position of the parking member 20 with respect to the parking gear 30 in the radial direction is different. The parking part 20 can thereby be moved radially by a rotational movement of the actuating part 12.

Referring to fig. 10, when the parking member 20 is coupled to the actuating member 12 through the first aligning groove 211, the parking member 20 is completely received in the actuator housing 11, and the parking member 20 is disengaged from the parking gear 30. Referring to fig. 8, when the parking member 20 is connected to the actuator 12 through the second alignment slot 212, the parking member 20 extends out of the actuator housing 11, and the parking member 20 can be aligned with the parking gear 30.

As shown in fig. 5 and fig. 8 to 10, a first locking hole 221 and a second locking hole 222 are further provided on the parking member 20 at the radial outer side, and the first locking hole 221 and the second locking hole 222 are used for the locking member to be inserted in alignment, so as to lock and fix the parking member 20.

As shown in fig. 5 and 10, the second locking hole 222 is located radially outward of the first locking hole 221. Further, the parking member 20 at different radial positions can be connected to the lock member 13 through the first lock hole 221 or the second lock hole 222, and thus can be fixed at different radial positions.

Referring to fig. 10, the parking member 20 can be locked in the disengaged state by the first locking hole 221 engaging with the locking member 13 in a positioning manner. Referring to fig. 8, the parking member 20 can be engaged with the locking member 13 through the second locking hole 222, and the parking member 20 is locked in the engaged state.

As shown in fig. 3 to 5, a radially inner side of the parking member 20 is formed with a lock tooth that can engage with the parking gear 30, and the parking member 20 and the parking gear 30 are engaged.

In the solution of the present invention, the parking brake 20 can be housed entirely in the actuator housing 11 in the radial direction, reducing the spatial dimension in the radial direction. Further, the parking material 20 is a plate-shaped member, and is aligned with the parking gear 30 by the linear motion in the radial direction, so that the unstable behavior of the parking material 20 is suppressed, and the parking material 20 and the parking gear 30 can be rapidly engaged with each other.

As shown in fig. 3 to 5, the lock member 13 is accommodated in the first accommodating chamber 111 in a manner of being radially movable relative to the actuator housing 11.

As shown in fig. 3 to 5, the overall locking member 13 is T-shaped, and includes a guide portion 131 and a locking portion 132.

The guide portion 131 is disposed in the third receiving chamber 113 so as to be capable of reciprocating relative to the parking member 20, and the lock portion 132 is disposed on a side of the guide portion 131 facing the parking member 20.

During the reciprocating motion of the guide portion 131 relative to the parking member 20, the locking portion 132 can be selectively inserted into the first or second alignment groove 211, 212, so as to lock or release the radial motion of the parking member 20. Referring to fig. 8 and 10, by changing the radial outer position of the parking member 20, the locking member 13 can lock the parking member 20 at different positions, so that the parking member 20 is locked at different states.

As shown in fig. 4 to 5, the guiding portion 131 is matched with the third receiving cavity 113 in shape, so as to achieve a guiding function for the guiding portion 131. More preferably, a guide groove is formed on an inner side surface of the third receiving cavity 113.

As shown in fig. 3 to 5, the lock spring 14 is disposed in the third housing chamber 113, and the lock spring 14 is disposed between the actuator housing 11 and the lock member 13. The axial both ends of the lock spring 14 abut against the actuator housing 11 and the lock member 13, respectively.

In a specific implementation, the locking spring 14 is disposed in a compressed state, so that the locking spring 14 can drive the locking member 13 to move toward the fixing plate 101, so that the locking member 13 is inserted into the first locking hole 221 or the second locking hole 222.

In particular implementations, the locking spring 14 may be a coil spring.

As shown in fig. 3 to 5, the actuating member 12 is rotatably supported about its own rotational axis in the second receiving cavity 112 of the actuator housing 11. And, the actuating member 12 is aligned and engaged to the first alignment groove 211 or the second alignment groove 212 on the parking member 20 from one side of the circumferential direction, so that the parking member 20 can be driven to move radially.

Specifically, the rotational axis of the actuator 12 is parallel to the rotational axis of the parking gear 30.

Referring to fig. 8 and 10, the actuating member 12 can be connected to the parking member 20 from one side in the circumferential direction. When the parking member 20 rotates, the parking member 20 is driven to move radially, so that the actuating member 12 is switched between the first aligning groove 211 and the second aligning groove 212.

In particular, the actuating element 12 is realized in the form of a gear. As shown in fig. 3 to 5, a plurality of engaging teeth for engaging with the parking member 20 are formed on the actuator 12 at equal angular intervals in the circumferential direction.

Specifically, the actuator 10 further includes a servo motor and a relay.

Wherein the servo motor is used to drive the actuating member 12 in a rotational movement about its own axis. The relay is disposed on the actuator housing 11 and the actuating member 12 and selectively provides a force against the locking spring 14 to move the locking member 13 away from the parking member 20.

Next, a structure of the parking gear 30 will be explained. Specifically, the parking gear 30 is non-detachably provided on the outer circumferential surface of the brake drum 301. As described above, the brake drum 301 is mounted on the wheel. When the parking member 20 stops the rotation of the parking gear 30, the corresponding rotation of the brake drum 301 is stopped, thereby stopping the rotation of the output shaft 500.

Since the parking gear 30 avoids the inner circumferential surface of the brake drum 301, the braking performance of the brake drum 301 is not affected. Accordingly, the inner circumferential surface of the brake drum 301 does not affect the parking lock performance of the parking gear 30. Meanwhile, the meshing teeth 31 of the parking gear 30 can increase the heat dissipation area of the brake drum 301, and improve the heat dissipation effect.

As shown in fig. 6 to 9, the present invention provides a detailed embodiment with respect to the parking gear 30.

Specifically, the parking gear 30 is formed with teeth 31, and the engaging teeth 31 engage with the locking pawls of the parking member 20. The engaging teeth 31 are formed at equal angular intervals in the circumferential direction of the parking gear 30. In a specific implementation, a groove is formed between adjacent meshing teeth 31, and the parking gear 30 is engaged with the parking member 20 when the radially inner side of the parking member 20 is aligned and locked in the groove.

Specifically, the engaging teeth 31 are protruded on the parking gear 30 in a radial direction outside of the parking gear 30 or in an axial direction one side of the parking gear 30.

In a specific implementation, the parking gear 30 may be fixed to the brake drum 301 by a screw connection, welding, or integral molding. The integral arrangement means that the parking gear 30 and the brake drum 301 are integrally formed by punching, drawing, bending or other manufacturing processes. For example, in a preferred embodiment, the plurality of engaging teeth 31 may be integrally formed with the brake drum 301.

As shown in fig. 6 to 7, in the present embodiment, the parking gear 30 includes an axially extending working portion 310 and a radially extending mounting portion 320.

As shown in fig. 6 to 7, the engaging teeth 31 of the parking gear 30 are formed on the outer circumferential surface of the working portion 310. As shown in fig. 7, in a specific implementation, the working portion 310 is disposed around an axial portion of the brake drum 301, and the mounting portion 320 is attached and fixed to a radial portion of the brake drum 301 from one axial side of the brake drum 301.

The operation of the parking lock mechanism 100 will be described below with reference to fig. 8 to 10:

referring to fig. 8, when the parking member 20 is connected to the actuating member 12 through the second aligning groove 212, the radially inner side of the parking member 20 is engaged with the parking gear 30; at this time, the lock member 13 is inserted into the second lock hole 222 under the urging of the lock spring 14, so that the parking member 20 and the parking gear 30 are maintained in the parking lock state.

Referring to fig. 9, by turning on the relay, the relay acts to drive the lock member 13 away from the parking member 20, so that the lock member 13 is disconnected from the parking member 20; at this time, the actuator 12 is driven to rotate by the servo motor, so that the parking member 20 is moved toward or away from the parking gear 30 in the radial direction, and the states of the parking member 20 and the parking gear 30 can be switched. For example, the state may be switched from the engaged state to the disengaged state, or may be switched from the disengaged state to the engaged state.

Referring to fig. 10, when the parking member 20 is coupled to the actuating member 12 through the first aligning groove 211, a radially inner side of the parking member 20 is disengaged from the parking gear 30; at this time, the lock member 13 is relatively inserted into the first lock hole 221 by being pushed by the lock spring 14, so that the parking member 20 and the parking gear 30 are maintained in the released state.

Obviously, in the scheme of the invention, the servo motor and the relay are controlled to operate in a matching way only in the state switching process. Furthermore, the parking lock mechanism 100 of the present invention can be provided independently of the hydraulic components or the hydraulic system.

The present invention has been described in detail, and the principle and the implementation of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; the present invention has been described in detail above without departing from the spirit of the present invention, and the principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to facilitate the understanding of the technical solutions and their core ideas; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its embodiments.

Claims (10)

1. The in-wheel motor assembly is characterized by comprising a shell, a parking locking mechanism and a brake drum which are sequentially arranged from the radial outer side to the radial inner side;

wherein the parking lock mechanism includes a parking gear provided radially outside the brake drum, an actuator provided radially inside the housing, and a parking member;

the parking piece is movably inserted in the actuator in the radial direction and can move close to or far away from the parking gear in the radial direction, so that the parking piece and the parking gear can be switched between an engaged state and a disengaged state;

the actuator is configured to move the park member in a radial direction and selectively lock the park member in the engaged state or the disengaged state.

2. The in-wheel motor assembly as claimed in claim 1, further comprising a motor having a stator disposed radially inward of the housing and axially adjacent to the actuator.

3. The in-wheel motor assembly of claim 1, wherein the parking gear is secured to the brake drum by a threaded connection, a weld, or an integral molding.

4. The in-wheel motor assembly of claim 3, wherein the parking gear is formed with a plurality of engaging teeth that protrude radially outward of the parking gear or axially to one side of the parking gear.

5. The in-wheel motor assembly of claim 1, wherein the actuator comprises an actuating member and a locking member, wherein:

the actuating piece is rotatably arranged and connected to the parking piece so as to drive the parking piece to move along the radial direction;

the lock member is selectively connectable to the parking member to lock the parking member in the engaged state or the disengaged state.

6. The in-wheel motor assembly of claim 5, wherein the actuator further comprises a detent spring for urging the detent member to couple to the parking member.

7. The in-wheel motor assembly of claim 5, wherein the parking member has a first locking hole and a second locking hole located radially outward of the first locking hole;

the lock member is engageable with the first lock hole or the second lock hole, respectively, to lock the parking member in the disengaged state and the engaged state.

8. The in-wheel motor assembly of claim 5, wherein the parking member has a first alignment groove and a second alignment groove located radially outward of the first alignment groove, the parking member being connected to the actuating member by the first alignment groove or the second alignment groove;

the actuating member can drive the parking member to switch between the disengaged state and the engaged state by switching between the first aligning groove and the second aligning groove.

9. The in-wheel motor assembly of claim 5, wherein the actuator further comprises an actuator housing divided into a first receiving cavity, and second and third receiving cavities disposed on a same side of the first receiving cavity;

the parking piece is accommodated in the first accommodating cavity in a manner of being capable of extending and contracting along the radial direction relative to the shell;

the actuating piece is rotatably arranged in the second accommodating cavity;

the locking piece is arranged in the third accommodating cavity in a reciprocating mode relative to the shell.

10. The in-wheel motor assembly of claim 5, wherein the actuator further comprises:

the servo motor is used for driving the actuating piece to rotate;

a relay selectively engageable with the latch member to disconnect the latch member from the parking member.

Images