Housing of wheel steering gear, wheel steering gear, and vehicle

Abstract

A housing of a wheel steering gear, a wheel steering gear, and a vehicle. A first mounting space and a second mounting space are formed in the housing, the first mounting space is adapted to accommodate a first transmission mechanism independently driving a first wheel to turn, and the second mounting space is adapted to accommodate a second transmission mechanism independently driving a second wheel to turn.

Description

Wheel steering device housing, wheel steering device and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202410454531.1, filed on April 15, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of vehicles, and in particular to a wheel steering device housing, a wheel steering device and a vehicle. BACKGROUND

[0003] With the continuous development of new energy vehicle technology, people's pursuit of the controllability and comfort of vehicles is also getting higher and higher. A wheel steering device that can effectively improve driving safety and flexibility and improve the comfort of drivers and passengers has begun to enter our field of vision. SUMMARY

[0004] The present disclosure aims to at least solve one of the technical problems existing in the related art. To this end, one object of the present disclosure is to provide a wheel steering device housing that can arrange a first transmission mechanism and a second transmission mechanism in the same housing, thereby expanding the use scenarios and saving more installation space, thereby facilitating the miniaturization and light weight of the overall structure.

[0005] The present disclosure further provides a wheel steering device.

[0006] The present disclosure still further provides a vehicle.

[0007] The wheel steering device housing according to some embodiments of the present disclosure comprises a first housing and a second housing. An installation space is formed between the first housing and the second housing, and the installation space is adapted to accommodate a first transmission mechanism for independently driving a first wheel to steer and a second transmission mechanism for independently driving a second wheel to steer.

[0008] Thus, when two sets of transmission mechanisms are adopted to independently control the first wheel and the second wheel, the first transmission mechanism and the second transmission mechanism are arranged in the same housing, thereby expanding the use scenarios and saving more installation space, thereby facilitating the miniaturization and light weight of the overall structure.

[0009] In some embodiments, the installation space comprises a first installation space and a second installation space. The first installation space is formed in the first housing, and the first installation space is adapted to accommodate the first transmission mechanism. The second installation space is formed in the second housing, and the second installation space is adapted to accommodate the second transmission mechanism. The first housing is connected with the second housing, and the first installation space and the second installation space are in communication.

[0010] In some embodiments, the first housing and the second housing are sealingly engaged.

[0011] In some embodiments, the housing of the wheel steering device further comprises a sealing member. The sealing member is sealingly engaged with the first housing and the second housing respectively. At least one of the first housing or the second housing is provided with a sealing groove for accommodating the sealing member.

[0012] In some embodiments, the first housing and the second housing are connected by a fastener.

[0013] A wheel steering device according to some embodiments of the present disclosure comprises the housing of the wheel steering device, the first transmission mechanism and the second transmission mechanism.

[0014] In some embodiments, the first transmission mechanism comprises a first driving force transmission assembly and a first transmission rod assembly. The first driving force transmission assembly is drivingly connected with the first transmission rod assembly, and the first transmission rod assembly is configured to steer the first wheel. The second transmission mechanism comprises a second driving force transmission assembly and a second transmission rod assembly. The second driving force transmission assembly is drivingly connected with the second transmission rod assembly, and the second transmission rod assembly is configured to steer the second wheel.

[0015] In some embodiments, the first driving force transmission assembly is connected to an end of the first transmission rod assembly adjacent to the second transmission rod assembly, and the second driving force transmission assembly is connected to an end of the second transmission rod assembly adjacent to the first transmission rod assembly.

[0016] In some embodiments, at least one of the following conditions is satisfied: a cross-sectional area of a side of the first housing along an axial direction away from the second housing is smaller than a cross-sectional area of a side of the first housing along the axial direction close to the second housing, and the first driving force transmission assembly is disposed in the mounting space on the side of the first housing along the axial direction close to the second housing; or a cross-sectional area of a side of the second housing along the axial direction away from the first housing is smaller than a cross-sectional area of a side of the second housing along the axial direction close to the first housing, and the second driving force transmission assembly is disposed in the mounting space on the side of the second housing along the axial direction close to the first housing.

[0017] In some embodiments, the first driving force transmission assembly and the second driving force transmission assembly satisfy at least one of the following: the first driving force transmission assembly comprises a first transmission wheel and a second transmission wheel, the second transmission wheel is in driving connection with the first transmission wheel and is located on a radial side of the first transmission wheel, and the second transmission wheel is in driving connection with the first transmission rod assembly; or the second driving force transmission assembly comprises a third transmission wheel and a fourth transmission wheel, the fourth transmission wheel is in driving connection with the third transmission wheel and is located on a radial side of the third transmission wheel, and the fourth transmission wheel is in driving connection with the second transmission rod assembly.

[0018] In some embodiments, the first transmission rod assembly and the second transmission rod assembly satisfy at least one of the following: the first transmission rod assembly comprises a first lead screw and a first lead screw sleeve, an end of the first lead screw adjacent to the second transmission rod assembly is in threaded connection with the first lead screw sleeve, the second transmission wheel is in driving connection with the first lead screw sleeve, and the second transmission wheel is configured to drive the first lead screw sleeve to rotate to drive the first lead screw to move, thereby driving the first wheel to steer; or the second transmission rod assembly comprises a second lead screw and a second lead screw sleeve, an end of the second lead screw adjacent to the first transmission rod assembly is in threaded connection with the second lead screw sleeve, the fourth transmission wheel is in driving connection with the second lead screw sleeve, and the fourth transmission wheel is configured to drive the second lead screw sleeve to rotate to drive the second lead screw to move, thereby driving the second wheel to steer.

[0019] In some embodiments, the first transmission mechanism comprises a first lead screw, and the second transmission mechanism comprises a second lead screw. The first lead screw is provided with a clearance space, and the second lead screw is provided with a matching part that can extend into the clearance space.

[0020] In some embodiments, the matching part is configured to be spaced apart from the inner wall of the clearance space when the matching part extends into the clearance space.

[0021] In some embodiments, the first transmission mechanism further comprises a first lead screw sleeve, the first lead screw is in threaded connection with the first lead screw sleeve, and the first lead screw sleeve is rotated to drive the first lead screw to move. The second transmission mechanism further comprises a second lead screw sleeve, the second lead screw is in threaded connection with the second lead screw sleeve, and the second lead screw sleeve is rotated to drive the second lead screw to move. An end of the second lead screw sleeve adjacent to the first lead screw is provided with a receiving space, and an end of the first lead screw adjacent to the second lead screw can extend into the receiving space.

[0022] In some embodiments, the first screw rod is configured to be spaced apart from the inner wall of the accommodating space when the one end of the first screw rod extends into the accommodating space adjacent to the second screw rod.

[0023] In some embodiments, the wheel steering device satisfies at least one of the following: the second transmission wheel is sleeved on the first screw rod sleeve and is in interference fit with the first screw rod sleeve; or the fourth transmission wheel is sleeved on the second screw rod sleeve and is in interference fit with the second screw rod sleeve.

[0024] In some embodiments, the wheel steering device further comprises at least one of a first bearing or a second bearing. The first bearing is arranged in the first mounting space, and the first screw rod sleeve is sleeved on the first bearing. The second bearing is arranged in the second mounting space, and the second screw rod sleeve is sleeved on the second bearing.

[0025] In some embodiments, the wheel steering device further comprises at least one of a third bearing or a fourth bearing. The third bearing is arranged in the first mounting space, and the first screw rod is sleeved on the third bearing. The third bearing is arranged at the end of the first screw rod away from the second screw rod. The fourth bearing is arranged in the second mounting space, and the second screw rod is sleeved on the fourth bearing. The fourth bearing is arranged at the end of the second screw rod away from the first screw rod.

[0026] In some embodiments, the wheel steering device further comprises a first limiting member and a second limiting member. The first limiting member is mounted on one of the housing and the first screw rod, and the first limiting member is movably fitted with the other of the housing and the first screw rod in the axial direction of the first screw rod. The second limiting member is mounted on one of the housing and the second screw rod, and the second limiting member is movably fitted with the other of the housing and the second screw rod in the axial direction of the second screw rod.

[0027] In some embodiments, the inner wall of the first mounting space is provided with a first sliding groove extending in the axial direction of the first screw rod, and the first limiting member is mounted on the first screw rod and fitted with the first sliding groove. The inner wall of the second mounting space is provided with a second sliding groove extending in the axial direction of the second screw rod, and the second limiting member is mounted on the second screw rod and fitted with the second sliding groove.

[0028] In some embodiments, the first screw rod is provided with a first mounting hole penetrating in the radial direction of the first screw rod, and the first limiting member is sleeved on the first mounting hole. The second screw rod is provided with a second mounting hole penetrating in the radial direction of the second screw rod, and the second limiting member is sleeved on the second mounting hole.

[0029] In some embodiments, the first screw rod is provided with a first limiting portion, the second screw rod is provided with a second limiting portion, an inner wall of the first mounting space is provided with a third limiting portion, and an inner wall of the second mounting space is provided with a fourth limiting portion. The third limiting portion is configured to stop the first limiting portion to define a limit position of the first screw rod moving away from the second screw rod. The fourth limiting portion is configured to stop the second limiting portion to define a limit position of the second screw rod moving away from the first screw rod.

[0030] In some embodiments, the wheel steering device satisfies at least one of the following: the first limiting portion is configured as a first shaft shoulder, and the third limiting portion is configured as a first boss protruding towards the first screw rod; or, the second limiting portion is configured as a second shaft shoulder, and the fourth limiting portion is configured as a second boss protruding towards the second screw rod.

[0031] In some embodiments, the wheel steering device satisfies at least one of the following: the first driving force transmission assembly further comprises a first transmission belt, and the first transmission belt is in driving connection with the first transmission wheel and the second transmission wheel, respectively; or, the second driving force transmission assembly further comprises a second transmission belt, and the second transmission belt is in driving connection with the third transmission wheel and the fourth transmission wheel, respectively.

[0032] In some embodiments, the first transmission mechanism and the second transmission mechanism are distributed along a line direction of the first wheel and the second wheel.

[0033] In some embodiments, the wheel steering device further comprises a first driving member and a second driving member. The first driving member is arranged in the housing and connected with the first transmission mechanism. The second driving member is arranged in the housing and connected with the second transmission mechanism.

[0034] In some embodiments, the first driving member and the second driving member are respectively arranged on opposite sides of the housing, and the opposite sides of the housing are respectively provided with a first through hole and a second through hole. The first driving member has a first driving shaft, the first driving shaft passes through the first through hole and is located in the first mounting space, and is connected with the first transmission mechanism. The second driving member has a second driving shaft, the second driving shaft passes through the second through hole and is located in the second mounting space, and is connected with the second transmission mechanism.

[0035] In some embodiments, the housing includes a main housing portion and a protrusion. The protrusion is provided at a middle portion of a length direction of the main housing portion and protrudes from an outer circumferential surface of the main housing portion. The protrusion and the main housing portion collectively form the first mounting space and the second mounting space. The first driving member and the second driving member are respectively mounted at opposite sides of the protrusion.

[0036] A vehicle according to some embodiments of the present disclosure includes a first wheel and a second wheel and the above-described wheel steering device.

[0037] Additional aspects and advantages of the present disclosure will be set forth in part in the description that follows, and in part will be apparent from the description, or can be learned by practice of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0038] Aspects and advantages of the above-described or additional aspects and advantages of at least one of the above-described or additional aspects and advantages of the present disclosure will become apparent and appreciated through description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0039] FIG. 1 is a cross-sectional view of a wheel steering device according to some embodiments of the present disclosure;

[0040] FIG. 2 is another cross-sectional view of a wheel steering device according to some embodiments of the present disclosure;

[0041] FIG. 3 is an enlarged view of an A region in FIG. 2;

[0042] FIG. 4 is a cross-sectional view of a first screw rod according to some embodiments of the present disclosure;

[0043] FIG. 5 is a cross-sectional view of a second screw rod according to some embodiments of the present disclosure;

[0044] FIG. 6 is a block diagram of a vehicle according to some embodiments of the present disclosure.

[0045] 100, wheel steering device; 200, housing; 300, vehicle; 1, first transmission mechanism; 11, first driving force transmission assembly; 111, first transmission wheel; 112, second transmission wheel; 113, first transmission belt; 12, first transmission rod assembly; 121, first screw rod; 1211, avoiding space; 1212, first mounting hole; 1213, first limiting part; 122, first screw rod sleeve; 2, second transmission mechanism; 21, second driving force transmission assembly; 211, third transmission wheel; 212, fourth transmission wheel; 213, second transmission belt; 22, second transmission rod assembly; 221, second screw rod; 2211, matching part; 2212, second mounting hole; 2213, second limiting part; 222, second screw rod sleeve; 2221, containing space; 3, first bearing; 4, second bearing; 5, first locking nut; 6, second locking nut; 7, first locking plug; 8, second locking plug; 9, third bearing; 91, fourth bearing; 92, first limiting part; 93, second limiting part; 94, first driving part; 95, second driving part; 201, first housing; 2011, first mounting space; 20111, first middle space; 20112, first side space; 20113, third limiting part; 2012, first sealing surface; 202, second housing; 2021, second mounting space; 20211, second middle space; 20212, second side space; 20213, fourth limiting part; 2022, second sealing surface; 2023, sealing groove; 203, sealing part; 204, main housing part; 205, protrusion. DETAILED DESCRIPTION

[0046] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and should not be construed as limiting the present disclosure.

[0047] In related art, a common structure of a wheel steering device is an integrated wheel steering device. Since the integrated wheel steering device has only one motor and one set of transmission mechanism, the left connecting shaft and the right connecting shaft cannot move in opposite directions when the device is working, and can only move to the left or to the right at the same time. The device cannot control the left and right wheels to deflect at different angles at the same time, and cannot deflect only one wheel while keeping the other wheel stationary at the same time. Therefore, the use scene of the device is greatly limited. In addition, since the device has only one motor and one set of transmission mechanism, the device also has the problem of insufficient output force. Under the development trend of higher and higher vehicle speed and heavier and heavier vehicle weight, the device has certain limitations. In addition, in order to achieve a larger steering angle, the transmission structure in the device inevitably needs to be made longer and heavier.

[0048] To this end, some embodiments of the present disclosure provide a housing of a wheel steering gear, a wheel steering gear, and a vehicle.

[0049] The housing 200 of the wheel steering gear 100 according to some embodiments of the present disclosure is described below with reference to FIGS. 1-5. The first transmission mechanism 1 and the second transmission mechanism 2 can be arranged in the same housing 200, which can save more installation space, thereby facilitating the miniaturization and light weight of the overall structure. The wheel steering gear 100 can be a front wheel steering gear or a rear wheel steering gear, which will be mainly described as a rear wheel steering gear below.

[0050] In some embodiments, as shown in FIGS. 1-5, the housing 200 is configured with a first installation space 2011 and a second installation space 2021. The first installation space 2011 is adapted to accommodate the first transmission mechanism 1 for independently steering the first wheel, and the second installation space 2021 is adapted to accommodate the second transmission mechanism 2 for independently steering the second wheel. For example, the first wheel can be a left wheel, and the second wheel can be a right wheel.

[0051] The housing 200 can be connected by a first housing 201 and a second housing 202. The first housing 201 and the second housing 202 can provide more flexible mounting points for matching the rear subframe of the vehicle, thereby improving the overall connection reliability and flexibility of the wheel steering gear 100. In addition, the first installation space 2011 and the second installation space 2021 are in communication with each other, which can not only divide the space boundaries but also jointly form a larger installation space, thereby improving the rationality of space arrangement.

[0052] For example, the first transmission mechanism 1 and the second transmission mechanism 2 are both in the same housing 200, but the two sets of transmission mechanisms can independently control the steering of the two wheels, thereby facilitating the implementation of an integrated and separate control type of structural arrangement. The integrated and separate control type arrangement can achieve different direction and angle deflection of the left and right wheels at the same time, and can also achieve deflection of only one wheel while keeping the other wheel stationary at the same time, thereby effectively increasing the steering scenarios of the wheels and improving the controllability and driving comfort of the vehicle under various road conditions.

[0053] In addition, compared with an integrated single-control wheel steering device (the integrated single-control wheel steering device can only simultaneously move the left wheel and the right wheel to the left or to the right, and the left wheel and the right wheel cannot simultaneously move in different directions, and the integrated single-control wheel steering device cannot only move one wheel and keep the other wheel stationary at the same time), the wheel steering device in some embodiments of the present disclosure can effectively increase the steering scenarios of the wheels and improve the steering power supply. Compared with a split control wheel steering device, the wheel steering device in some embodiments of the present disclosure can save internal installation space, improve the space compactness of the overall structure, and improve the practicability and reliability of the integrated split-control structure arrangement.

[0054] Therefore, when two sets of transmission mechanisms are used to independently control the first wheel and the second wheel, the first transmission mechanism 1 and the second transmission mechanism 2 can be arranged in the same housing 200, which widens the use scenarios and saves more installation space, thereby facilitating the miniaturization and light weight of the overall structure.

[0055] In some embodiments, as shown in FIGS. 1 and 2, the housing 200 includes a first housing 201 and a second housing 202. The first housing 201 is formed with a first installation space 2011 adapted to accommodate the first transmission mechanism 1. The second housing 202 is formed with a second installation space 2021 adapted to accommodate the second transmission mechanism 2. The second housing 202 is connected to the first housing 201, and the first installation space 2011 and the second installation space 2021 are in communication. For example, the first housing 201 can be a left housing, and the second housing 202 can be a right housing.

[0056] For example, the housing 200 can be connected by the first housing 201 and the second housing 202, and the outer portions of the first housing 201 and the second housing 202 can provide more flexible mounting points for matching the rear subframe of the vehicle, thereby improving the overall connection reliability and flexibility of the wheel steering device 100. In addition, the first installation space 2011 and the second installation space 2021 are in communication with each other, which can divide the space boundaries and also jointly form a larger installation space, thereby improving the space arrangement rationality.

[0057] In addition, the first installation space 1 and the second installation space 2 can respectively accommodate the first transmission mechanism 1 and the second transmission mechanism 2, thereby dividing the space for different structures and improving the structure arrangement regularity. For example, as shown in FIGS. 1 and 2, the first installation space 2011 and the second installation space 2021 are respectively used to accommodate the first transmission mechanism 1 and the second transmission mechanism 2 on the left and right sides.

[0058] In some embodiments, as shown in FIGS. 1-3, the first shell 201 and the second shell 202 are sealingly fitted. For example, the shell 200 further comprises a sealing member 203 sealingly fitted with the first shell 201 and the second shell 202, respectively. In this way, the sealing performance of the interior of the shell 200 can be effectively improved, and the dust and water from the outside can be prevented from entering the interior of the shell 200.

[0059] At least one of the first shell 201 or the second shell 202 is provided with a sealing groove 2023 accommodating the sealing member 203. In this way, the sealing member 203 can be provided with an accurate installation position, and the sealing member 203 can be prevented from shaking. Here, "at least one of A, B and C" has the same meaning as "at least one of A, B or C", and includes the following combinations of A, B and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B and C.

[0060] In some embodiments, as shown in FIGS. 1-3, the side of the first shell 201 facing the second shell 202 is provided with a first sealing surface 2012, and the side of the second shell 202 facing the first shell 201 is provided with a second sealing surface 2022. The sealing member 203 is sealingly fitted with the first sealing surface 2012 and the second sealing surface 2022, respectively. As shown in FIG. 1, in the left-right direction, the first sealing surface 2012 and the second sealing surface 2022 are formed on the side end surfaces of the first shell 201 and the second shell 202 facing each other, respectively, and the sealing member 203 is sealingly filled between the first sealing surface 2012 and the second sealing surface 2022. In this way, the sealing performance of the interior of the shell 200 can be improved, and the dust and water from the outside can be prevented from entering the interior of the shell 200.

[0061] In some embodiments, as shown in FIGS. 1-3, the first sealing surface 2012, the second sealing surface 2022 and the sealing member 203 are configured to be annularly matched with each other, and at least one of the first sealing surface 2012 and the second sealing surface 2022 is provided with a sealing groove 2023 accommodating the sealing member 203. The sealing member 203 is sealed along the circumferential direction of the shell 200, and the first sealing surface 2012, the second sealing surface 2022 and the sealing member 203 are configured to be annularly matched with each other. In this way, the sealing reliability can be improved. For example, the first sealing surface 2012 is provided with the sealing groove 2023, so that the sealing member 203 can be provided with an accurate installation position, and the sealing member 203 can be prevented from shaking.

[0062] In some embodiments, the first shell 201 and the second shell 202 are connected by fasteners. The fasteners connect the first shell 201 and the second shell 202 into a whole, so that the structural strength and the spatial mode of each other can be enhanced, and the overall structural reliability can be improved.

[0063] The wheel steering device 100 of some embodiments of the present disclosure is described below.

[0064] As shown in FIGS. 1 and 2, the wheel steering device 100 comprises the housing 200, the first transmission mechanism 1 and the second transmission mechanism 2 of the wheel steering device described above. The first transmission mechanism 1 and the second transmission mechanism 2 can be both mounted inside the housing 200, and the first transmission mechanism 1 and the second transmission mechanism 2 can independently drive the wheels connected thereto to steer, respectively.

[0065] In some examples, as shown in FIGS. 1 and 2, the first transmission mechanism 1 comprises a first driving force transmission assembly 11 and a first transmission rod assembly 12. The first driving force transmission assembly 11 is in driving connection with the first transmission rod assembly 12, and the first transmission rod assembly 12 is used to drive the first wheel to steer. The second transmission mechanism 2 comprises a second driving force transmission assembly 21 and a second transmission rod assembly 22. The second driving force transmission assembly 21 is in driving connection with the second transmission rod assembly 22, and the second transmission rod assembly 22 is used to drive the second wheel to steer. The first driving force transmission assembly 11 is connected to one end of the first transmission rod assembly 12 adjacent to the second transmission rod assembly 22, and the second driving force transmission assembly 21 is connected to one end of the second transmission rod assembly 22 adjacent to the first transmission rod assembly 12.

[0066] For example, the first wheel can be a left wheel, and the second wheel can be a right wheel. The first driving force transmission assembly 11 transmits driving force to the first transmission rod assembly 12, and the first transmission rod assembly 12 transmits the driving force to the first wheel, thereby achieving the effect of independently controlling the first wheel to steer. The second driving force transmission assembly 21 transmits driving force to the second transmission rod assembly 22, and the second transmission rod assembly 22 transmits the driving force to the second wheel, thereby achieving the effect of independently controlling the second wheel to steer.

[0067] In some embodiments, the first driving force transmission assembly 11 and the second driving force transmission assembly 21 are adjacent and spaced apart, and the first transmission rod assembly 12 and the second transmission rod assembly 22 are in a trend of moving away from each other in the axial direction. In this way, the first driving force transmission assembly 11 and the second driving force transmission assembly 21 can be placed in the middle region of the installation space, which can improve the compactness of the structure. The first transmission rod assembly 12 and the second transmission rod assembly 22 extend in the left-right direction, which can facilitate the connection with the wheels on both sides of the vehicle, thereby improving the rationality of space arrangement.

[0068] In some examples, as shown in FIGS. 1 and 2, the first installation space 2011 includes a first middle space 20111 and a first side space 20112 which are in communication with each other. The first drive force transmission assembly 11 is located in the first middle space 20111, the first transmission rod assembly 12 is located in the first side space 20112, and part of the first transmission rod assembly 12 extends into the first middle space 20111. In this way, the first drive force transmission assembly 11 is mainly placed in the first middle space 20111, the first transmission rod assembly 12 is mainly placed in the first side space 20112, and part of the first transmission rod assembly 12 extends into the first middle space 20111 and is in transmission connection with the first drive force transmission assembly 11, so that the required arrangement space of the first drive force transmission assembly 11 and the first transmission rod assembly 12 can be reasonably provided, thereby improving the arrangement rationality of the first installation space 2011.

[0069] As shown in FIGS. 1 and 2, the second installation space 2021 includes a second middle space 20211 and a second side space 20212 which are in communication with each other. The second drive force transmission assembly 21 is located in the second middle space 20211, the second transmission rod assembly 22 is located in the second side space 20212, and part of the second transmission rod assembly 22 extends into the second middle space 20211. The first middle space 20111 is in communication with the second middle space 20211, the first side space 20112 is located on the side of the first middle space 20111 away from the second middle space 20211, and the second side space 20212 is located on the side of the second middle space 20211 away from the first middle space 20111.

[0070] In this way, the second drive force transmission assembly 21 is mainly placed in the second middle space 20211, the second transmission rod assembly 22 is mainly placed in the second side space 20212, and part of the second transmission rod assembly 22 extends into the second middle space 20211 and is in transmission connection with the second drive force transmission assembly 21, so that the required arrangement space of the second drive force transmission assembly 21 and the second transmission rod assembly 22 can be reasonably provided, thereby improving the arrangement rationality of the second installation space 2021.

[0071] In some embodiments, as shown in FIGS. 1 and 2, the cross-sectional area of the first side space 20112 is smaller than the cross-sectional area of the first middle space 20111, and the cross-sectional area of the second side space 20212 is smaller than the cross-sectional area of the second middle space 20211. The first middle space 20111 and the second middle space 20211 are in communication with each other, and together form an integral middle space. Since the first driving force transmission assembly 11 and the partial first transmission rod assembly 12 occupying a large volume are arranged in the middle space in the radial direction, and the partial first transmission rod assembly 12 occupying a large volume is arranged in the first side space 20112 in the axial direction, the cross-sectional area of the first side space 20112 and the cross-sectional area of the second side space 20212 are both smaller than the cross-sectional area of the middle space, so that the compactness and rationality of the structure of the wheel aligner 100 can be improved.

[0072] For example, as shown in FIGS. 1 and 2, the cross-sectional area of the side of the first housing 201 away from the second housing 202 in the axial direction is smaller than the cross-sectional area of the side of the first housing 201 close to the second housing 202 in the axial direction, and the first driving force transmission assembly 11 is arranged in the mounting space on the side of the first housing 201 close to the second housing 202 in the axial direction. The cross-sectional area of the side of the second housing 202 away from the first housing 201 in the axial direction is smaller than the cross-sectional area of the side of the second housing 202 close to the first housing 201 in the axial direction, and the second driving force transmission assembly 21 is arranged in the mounting space on the side of the second housing 202 close to the first housing 201 in the axial direction.

[0073] The first housing 201 and the second housing 202 are connected to each other, and together form an integral middle space. Since the first driving force transmission assembly 11 and the partial first transmission rod assembly 12 occupying a large volume are arranged in the middle space in the radial direction, and the partial first transmission rod assembly 12 occupying a large volume is arranged in the first side space 20112 in the axial direction, the cross-sectional area of the side of the first housing 201 away from the second housing 202 in the axial direction is smaller than the cross-sectional area of the side of the first housing 201 close to the second housing 202 in the axial direction, so that the compactness and rationality of the structure of the wheel aligner 100 can be improved.

[0074] In addition, since the second driving force transmission assembly 21 and the partial second transmission rod assembly 22 occupying a large volume are arranged in the middle space in the radial direction, and the partial second transmission rod assembly 22 occupying a large volume is arranged in the second side space 20212 in the axial direction, the cross-sectional area of the side of the second housing 202 away from the first housing 201 in the axial direction is smaller than the cross-sectional area of the side of the second housing 202 close to the first housing 201 in the axial direction, so that the compactness and rationality of the structure of the wheel aligner 100 can be improved.

[0075] In some embodiments, as shown in FIGS. 1 and 2, the first driving force transmission assembly 11 includes a first transmission wheel 111 and a second transmission wheel 112, the second transmission wheel 112 is in driving connection with the first transmission wheel 111 and located at a side of the first transmission wheel 111 in a radial direction, and the second transmission wheel 112 is in driving connection with the first transmission rod assembly 12. The second driving force transmission assembly 21 includes a third transmission wheel 211 and a fourth transmission wheel 212, the fourth transmission wheel 212 is in driving connection with the third transmission wheel 211 and located at a side of the third transmission wheel 211 in a radial direction, and the fourth transmission wheel 212 is in driving connection with the second transmission rod assembly 22.

[0076] The first transmission wheel 111 can transmit power to the second transmission wheel 112, and the second transmission wheel 112 can transmit power to the first transmission rod assembly 12, so that the driving force can be gradually transmitted, thereby achieving the control effect of the wheel steering. The second transmission wheel 112 is located at a side of the first transmission wheel 111 in a radial direction, so that the driving force can be continuously transmitted through the continuous relative rotation of the two, thereby improving the transmission efficiency.

[0077] The third transmission wheel 211 can transmit power to the fourth transmission wheel 212, and the fourth transmission wheel 212 can transmit power to the second transmission rod assembly 22, so that the driving force can be gradually transmitted, thereby achieving the control effect of the wheel steering. The fourth transmission wheel 212 is located at a side of the third transmission wheel 211 in a radial direction, so that the driving force can be continuously transmitted through the continuous relative rotation of the two, thereby improving the transmission efficiency.

[0078] In some embodiments, as shown in FIGS. 1 and 2, the first transmission mechanism 1 includes a first screw rod 121 and a first screw rod sleeve 122. For example, the first transmission rod assembly 12 includes the first screw rod 121 and the first screw rod sleeve 122. An end of the first screw rod 121 adjacent to the second transmission rod assembly 22 is in threaded cooperation with the first screw rod sleeve 122, and the second transmission wheel 112 is in driving connection with the first screw rod sleeve 122. The second transmission wheel 112 drives the first screw rod sleeve 122 to rotate to drive the first screw rod 121 to move, thereby driving the first wheel to steer.

[0079] For example, the first screw rod 121 is provided with external threads on the outer periphery, the first screw rod sleeve 122 is provided with internal threads on the inner wall, and the external threads on the first screw rod 121 are in threaded cooperation with the internal threads of the first screw rod sleeve 122. Moreover, the first screw rod sleeve 122 is in driving connection with the second transmission wheel 112. In this way, the second transmission wheel 112 can drive the first screw rod sleeve 122 to rotate to drive the first screw rod 121 to move along the threads (that is, the rotational motion of the first screw rod 121 is converted into linear motion along the axial direction of the first screw rod 121), so that the first screw rod 121 extends or retracts along the axial direction.

[0080] In some embodiments, as shown in FIG. 1 and FIG. 2, the second transmission mechanism 2 comprises a second screw rod 221 and a second screw rod sleeve 222. For example, the second transmission rod assembly 22 comprises the second screw rod 221 and the second screw rod sleeve 222. One end of the second screw rod 221 adjacent to the first transmission rod assembly 12 is threadedly engaged with the second screw rod sleeve 222, and the fourth transmission wheel 212 is drivingly connected with the second screw rod sleeve 222. The fourth transmission wheel 212 drives the second screw rod sleeve 222 to rotate to drive the second screw rod 221 to move, thereby driving the second wheel to steer.

[0081] For example, the second screw rod 221 is externally threaded, the second screw rod sleeve 222 is internally threaded, and the external threads on the second screw rod 221 are threadedly engaged with the internal threads of the second screw rod sleeve 222. Moreover, the second screw rod sleeve 222 is drivingly connected with the fourth transmission wheel 212. In this way, the fourth transmission wheel 212 drives the second screw rod sleeve 222 to rotate to drive the second screw rod 221 to move along the threads (i.e., to convert the rotational motion of the second screw rod 221 into linear motion along the axial direction of the second screw rod 221), thereby causing the second screw rod 221 to extend or retract along the axial direction of the second screw rod 221.

[0082] In some embodiments, as shown in FIG. 4 and FIG. 5, the first screw rod 121 is provided with a clearance space 1211, and the second screw rod 221 is provided with a matching portion 2211 that can extend into the clearance space 1211.

[0083] For example, the first wheel can be a left wheel, and the second wheel can be a right wheel. The first screw rod 121 and the second screw rod 221 can move along the axial direction of the first screw rod 121 and the second screw rod 221, respectively, and independently drive the first wheel and the second wheel to steer. When the first screw rod 121 and the second screw rod 221 are simultaneously retracted from the outside to the inside (i.e., the first screw rod 121 and the second screw rod 221 approach each other), the matching portion 2211 of the second screw rod 221 can extend into the clearance space 1211 of the first screw rod 121. In this way, the end surfaces of the first screw rod 121 and the second screw rod 221 can be prevented from colliding prematurely, ensuring that the first screw rod 121 and the second screw rod 221 have sufficient safety distance, and effectively reducing the movement space required by the first screw rod 121 and the second screw rod 221 in the wheel steering device 100, thereby effectively saving space and improving the compactness of the wheel steering device 100. The safety distance between the first screw rod 121 and the second screw rod 221 can be understood as the first screw rod 121 and the second screw rod 221 being spaced apart to avoid interference between the first screw rod 121 and the second screw rod 221.

[0084] It can be understood that, by adopting the nested screw structure, the need for double or even more avoidance space for the same axis arrangement of two sets of traditional solid screw and screw sleeve structures can be avoided. Moreover, the nested screw structure enables two sets of transmission structures to operate simultaneously without interference, greatly improves the effective limit travel of the device in a small space, effectively saves the space required for arranging two sets of transmission systems, makes the entire wheel steering gear structure more compact and has higher space utilization, and can meet the needs of larger turning angles of the vehicle wheels.

[0085] In some embodiments, as shown in FIGS. 1 and 4, the fitting part 2211 extends into the avoidance space 1211, and the fitting part 2211 is spaced apart from the inner wall of the avoidance space 1211. As the first screw 121 and the second screw 221 approach each other, the fitting part 2211 gradually and completely extends into the avoidance space 1211 along the axial direction of the second screw 221. In this case, the fitting part 2211 still maintains a safe distance from the inner wall of the avoidance space 1211, which can prevent the second screw 221 from colliding with the first screw 121 and causing structural damage, and can also avoid interference between the first screw 121 and the second screw 221 in the steering transmission.

[0086] In some embodiments, as shown in FIGS. 1 and 2, the end of the second screw sleeve 222 adjacent to the first screw 121 is provided with a containing space 2221, and the end of the first screw 121 adjacent to the second screw 221 can extend into the containing space 2221. During the process of the first screw 121 and the second screw 221 approaching each other from the outside to the inside, the end of the first screw 121 adjacent to the second screw 221 can gradually extend into the containing space 2221 at the end of the second screw sleeve 222 adjacent to the first screw 121. In this way, a staggered arrangement of mutual nesting can be formed (that is, the fitting part 2211 of the second screw 221 extends into the avoidance space 1211 of the first screw 121, and part of the first screw 121 extends into the containing space 2221 of the second screw sleeve 222). This can further shorten the axial space, thereby improving the compactness of the space structure of the wheel steering gear 100.

[0087] In some embodiments, as shown in FIG. 1 and FIG. 2, after the first screw rod 121 extends into the accommodating space 2221 at one end adjacent to the second screw rod 221, the first screw rod 121 is spaced apart from the inner wall of the accommodating space 2221. As the first screw rod 121 and the second screw rod 221 move closer to each other, the end of the first screw rod 121 adjacent to the second screw rod 221 gradually extends completely into the accommodating space 2221 in the axial direction. In this case, the end of the first screw rod 121 adjacent to the second screw rod 221 still maintains a safe distance from the inner wall of the accommodating space 2221, which can prevent the first screw rod 121 from colliding with the second screw rod sleeve 222 and causing structural damage, and can also avoid the first screw rod 121 and the second screw rod 221 interfering with each other's steering transmission.

[0088] For example, the first wheel can be a left wheel, and the second wheel can be a right wheel. The first screw rod 121 and the second screw rod 221 can move in the axial direction of themselves and drive the first wheel and the second wheel connected thereto to steer. When the first screw rod 121 and the second screw rod 221 are simultaneously retracted from the outside to the inside (i.e., the first screw rod 121 and the second screw rod 221 move closer to each other), the matching part 2211 of the second screw rod 221 can extend into the avoidance space 1211 of the first screw rod 121, which can avoid the end faces of the first screw rod 121 and the second screw rod 221 colliding too early and ensure that the first screw rod 121 and the second screw rod 221 have sufficient safety distance.

[0089] Furthermore, when initially set, the matching part 2211 of the second screw rod 221 can extend into the avoidance space 1211 of the first screw rod 121, which can reduce the axial size of the wheel steering gear 100 under the premise that the sizes of the first screw rod 121 and the second screw rod 221 remain unchanged, and also effectively reduce the moving space required by the first screw rod 121 and the second screw rod 221 in the wheel steering gear 100, thereby effectively saving space and improving the compactness of the space structure of the wheel steering gear 100.

[0090] Therefore, by providing the wheel steering gear 100, when the first screw rod 121 and the second screw rod 221 move towards each other, sufficient safety distance can be ensured while effectively saving space. Furthermore, when the wheel steering gear 100 is initially set, the matching part 2211 of the second screw rod 221 can extend into the avoidance space 1211 of the first screw rod 121, which can reduce the axial size of the wheel steering gear 100 under the premise that the sizes of the first screw rod 121 and the second screw rod 221 remain unchanged, thereby improving the lightweight effect and the compactness of the structure of the wheel steering gear 100.

[0091] In some embodiments, as shown in FIGS. 1 and 2, the second transmission wheel 112 is sleeved on the first lead screw sleeve 122, and the second transmission wheel 112 is in interference fit with the first lead screw sleeve 122; or, the fourth transmission wheel 212 is sleeved on the second lead screw sleeve 222, and the fourth transmission wheel 212 is in interference fit with the second lead screw sleeve 222; or, the second transmission wheel 112 is sleeved on the first lead screw sleeve 122, and the second transmission wheel 112 is in interference fit with the first lead screw sleeve 122, and the fourth transmission wheel 212 is sleeved on the second lead screw sleeve 222, and the fourth transmission wheel 212 is in interference fit with the second lead screw sleeve 222. The connection mode of interference fit between the two parts can enhance the connection firmness and tightness of each other, and also can make the extrusion force between the two parts evenly distributed, which can reduce looseness, thereby improving the operation stability of the parts; and the interference fit can reduce the risk of part fracture and cracking by improving the load bearing capacity, effectively reducing the damage probability caused by connection failure, thereby prolonging the service life of the parts. In addition, the second transmission wheel 112 is sleeved on the first lead screw sleeve 122, which is convenient for the second transmission wheel 112 to transmit power to the first lead screw sleeve 122; the fourth transmission wheel 212 is sleeved on the second lead screw sleeve 222, which is convenient for the fourth transmission wheel 212 to transmit power to the second lead screw sleeve 222.

[0092] In some embodiments, as shown in FIGS. 1 and 2, the wheel steering device 100 further comprises a first bearing 3 and a second bearing 4. The first bearing 3 is arranged in the first mounting space 2011, and the second bearing 4 is arranged in the second mounting space 2021. The first lead screw sleeve 122 is arranged through the first bearing 3, and the second lead screw sleeve 222 is arranged through the second bearing 4. The first bearing 3 and the second bearing 4 are both rolling bearings. Compared with sliding bearings, rolling bearings can bear radial and axial loads, smoothly transmit forces to other components, and ensure the normal operation of machines; rolling bearings can also reduce frictional resistance, and through the rolling rotation of steel balls in the ball channel, rolling friction is formed, thereby reducing the friction force of the contact part between the bearing and the outside world and reducing energy loss. The first bearing 3 and the second bearing 4 are both ball bearings.

[0093] For example, the first lead screw sleeve 122 is arranged through the first bearing 3, which can support the first lead screw sleeve 122, ensure the rotation accuracy of the first lead screw sleeve 122 during rotation, and have the effects of transmitting load and shock absorption and vibration isolation, thereby improving the operation stability of the first lead screw sleeve 122. The first bearing 3 is located in the first mounting space 2011, so that the mounting space of the first bearing 3 can be more clearly divided, thereby making the internal structure arrangement of the wheel steering device 100 more reasonable and clear.

[0094] For another example, the second screw sleeve 222 is arranged in the second bearing 4. The second bearing 4 can support the second screw sleeve 222, ensure the rotation accuracy of the second screw sleeve 222 during rotation, and transmit load and reduce vibration and shock, thereby improving the operation stability of the second screw sleeve 222. The second bearing 4 is located in the second mounting space 2021. In this way, the mounting space of the second bearing 4 can be more clearly divided, and the structure arrangement inside the wheel steering gear 100 is more reasonable and clear.

[0095] In some embodiments, as shown in FIGS. 1 and 2, the wheel steering gear 100 further comprises a first locking nut 5 and a second locking nut 6. The first locking nut 5 is arranged on the first screw sleeve 122, and the first locking nut 5 is located on the side of the first bearing 3 away from the second bearing 4, and the first locking nut 5 and the first screw sleeve 122 are threadedly engaged. The second locking nut 6 is arranged on the second screw sleeve 222, and the second locking nut 6 is located on the side of the second screw sleeve 222 away from the first bearing 3, and the second locking nut 6 and the second screw sleeve 222 are threadedly engaged.

[0096] The inner threads of the first locking nut 5 and the second locking nut 6 can be threadedly engaged with the external threads on the outer periphery of the first screw sleeve 122 and the second screw sleeve 222, respectively. The first locking nut 5 and the second locking nut 6 can prevent loosening and maintain fastening force. For example, the first locking nut 5 is arranged on the side of the first bearing 3 away from the second bearing 4. Since the first bearing 3 vibrates frequently and is subjected to more external force impact, the bolt at this position is prone to loosening under stress. At this time, the use of the first locking nut 5 can prevent the bolt from loosening to a certain extent and maintain a stable state of fastening.

[0097] In some embodiments, as shown in FIGS. 1 and 2, the wheel steering gear 100 further comprises a first locking nut 5 and a second locking nut 6. The first locking nut 5 is arranged on the first screw sleeve 122, and the first locking nut 5 is located on the side of the first bearing 3 away from the second bearing 4, and the first locking nut 5 and the first screw sleeve 122 are threadedly engaged. The second locking nut 6 is arranged on the second screw sleeve 222, and the second locking nut 6 is located on the side of the second screw sleeve 222 away from the first bearing 3, and the second locking nut 6 and the second screw sleeve 222 are threadedly engaged.

[0098] The inner threads of the first locking nut 5 and the second locking nut 6 can be threadedly engaged with the external threads on the outer periphery of the first screw sleeve 122 and the second screw sleeve 222, respectively. The first locking nut 5 and the second locking nut 6 can prevent loosening and maintain fastening force. For example, the first locking nut 5 is arranged on the side of the first bearing 3 away from the second bearing 4. Since the first bearing 3 vibrates frequently and is subjected to more external force impact, the bolt at this position is prone to loosening under stress. At this time, the use of the first locking nut 5 can prevent the bolt from loosening to a certain extent and maintain a stable state of fastening.

[0099] In some embodiments, as shown in FIG. 1 and FIG. 2, the wheel steering device 100 further comprises a third bearing 9 and a fourth bearing 91. The third bearing 9 is arranged in the first mounting space 2011, and the fourth bearing 91 is arranged in the second mounting space 2021. The first screw rod 121 is arranged through the third bearing 9, and the second screw rod 221 is arranged through the fourth bearing 91. The third bearing 9 and the fourth bearing 91 are both sliding bearings. The sliding bearing has the advantages of simple structure, light weight, long-term high load bearing, stable and reliable operation, no noise, high load capacity, large power transmission, and easy assembly and disassembly compared with the rolling bearing. Therefore, the first screw rod 121 and the second screw rod 221 are arranged through the third bearing 9 and the fourth bearing 91 respectively, which can improve the rotation stability of the first screw rod 121 and the second screw rod 221, and improve the reliability and service life of the wheel steering device 100.

[0100] In addition, the third bearing 9 is arranged at the end of the first screw rod 121 away from the second screw rod 221, and the fourth bearing 91 is arranged at the end of the second screw rod 221 away from the first screw rod 121, which can help to offset the shaking of the first screw rod 121 and the second screw rod 221 at the end, thereby forming a reliable and stable supporting effect on the first screw rod 121 and the second screw rod 221.

[0101] In some embodiments, as shown in FIG. 1 and FIG. 2, the wheel steering device 100 further comprises a first limiting piece 92 and a second limiting piece 93. The first limiting piece 92 is mounted on one of the housing 200 and the first screw rod 121, and the first limiting piece 92 is movably matched with the other of the housing 200 and the first screw rod 121 along the axial direction of the first screw rod 121. The second limiting piece 93 is mounted on one of the housing 200 and the second screw rod 221, and the second limiting piece 93 is movably matched with the other of the housing 200 and the second screw rod 221 along the axial direction of the second screw rod 221.

[0102] For example, when the first limiting piece 92 is mounted on the first screw rod 121, the first limiting piece 92 is movably matched with the housing 200 along the axial direction of the first screw rod 121. In this way, on the one hand, the circumferential rotation of the first screw rod 121 can be limited, and on the other hand, the first screw rod 121 can also be allowed to move along the axial direction of itself, so that the first screw rod 121 can convert the relative rotational motion between the first screw rod 121 and the first screw rod sleeve 122 into axial linear motion.

[0103] For example, when the second limiting member 93 is installed on the second screw rod 221, the second limiting member 93 is movably matched with the housing 200 along the axial direction of the second screw rod 221. In this way, on the one hand, the circumferential rotation of the second screw rod 221 can be limited, and on the other hand, the axial movement of the second screw rod 221 can be allowed, so that the second screw rod 221 can convert the relative rotation movement between the second screw rod 221 and the second screw rod sleeve 222 into the axial linear movement.

[0104] In some embodiments, the inner wall of the first mounting space 2011 can be provided with a first sliding groove extending along the axial direction of the first screw rod 121, and the first limiting member 92 is installed on the first screw rod 121 and matched with the first sliding groove; the inner wall of the second mounting space 2021 can be provided with a second sliding groove extending along the axial direction of the second screw rod 221, and the second limiting member 93 is installed on the second screw rod 221 and matched with the second sliding groove.

[0105] The first mounting space 2011 is provided with a first sliding groove and a second sliding groove in the axial direction, and the first limiting member 92 on the first screw rod 121 and the second limiting member 93 on the second screw rod 221 are respectively matched with the first sliding groove and the second sliding groove, so that the first limiting member 92 and the second limiting member 93 can drive the first screw rod 121 and the second screw rod 221 to move along the specified path respectively, thereby ensuring the movement accuracy and stability of the first screw rod 121 and the second screw rod 221.

[0106] In some embodiments, as shown in FIG. 1, FIG. 4 and FIG. 5, the first screw rod 121 is configured with a first mounting hole 1212 penetrating through the radial direction of the first screw rod 121, and the first limiting member 92 is arranged in the first mounting hole 1212; the second screw rod 221 is configured with a second mounting hole 2212 penetrating through the radial direction of the second screw rod 221, and the second limiting member 93 is arranged in the second mounting hole 2212.

[0107] It can be understood that the first limiting member 92 is arranged in the first mounting hole 1212 penetrating through the radial direction of the first screw rod 121, so that the first limiting member 92 can protrude radially from the outer peripheral edge of the first screw rod 121, thereby ensuring that the first limiting member 92 can limit the circumferential rotation of the first screw rod 121 when the first limiting member 92 is matched with the first sliding groove, and the first screw rod 121 can move along the axial direction; the second limiting member 93 is arranged in the second mounting hole 2212 penetrating through the radial direction of the second screw rod 221, so that the second limiting member 93 can protrude radially from the outer peripheral edge of the second screw rod 221, thereby ensuring that the second limiting member 93 can limit the circumferential rotation of the second screw rod 221 when the second limiting member 93 is matched with the second sliding groove, and the second screw rod 221 can move along the axial direction.

[0108] In some embodiments, as shown in FIG. 1, FIG. 4 and FIG. 5, the first screw rod 121 is provided with a first limiting portion 1213, the second screw rod 221 is provided with a second limiting portion 2213, the inner wall of the first mounting space 2011 is provided with a third limiting portion 20113, and the inner wall of the second mounting space 2021 is provided with a fourth limiting portion 20213; the third limiting portion 20113 can stop the first limiting portion 1213 to limit the maximum moving distance of the first screw rod 121 away from the second screw rod 221; and the fourth limiting portion 20213 can stop the second limiting portion 2213 to limit the maximum moving distance of the second screw rod 221 away from the first screw rod 121.

[0109] The third limiting portion 20113 on the inner wall of the first mounting space 2011 can form a stopping effect on the first limiting portion 1213 on the first screw rod 121 in the axial direction, so as to prevent the first screw rod 121 from moving too much away from the second screw rod 221, that is, to limit the maximum moving distance of the first screw rod 121 away from the second screw rod 221, so that the first screw rod 121 can have a reasonable and controllable moving range interval; and the fourth limiting portion 20213 on the inner wall of the second mounting space 2021 can form a stopping effect on the second limiting portion 2213 on the second screw rod 221 in the axial direction, so as to prevent the second screw rod 221 from moving too much away from the first screw rod 121, that is, to limit the maximum moving distance of the second screw rod 221 away from the first screw rod 121, so that the second screw rod 221 can have a reasonable and controllable moving range interval.

[0110] In some embodiments, as shown in FIG. 1, FIG. 4 and FIG. 5, the first limiting portion 1213 is configured as a first shaft shoulder, and the third limiting portion 20113 is configured as a first boss protruding towards the first screw rod 121; or, the second limiting portion 2213 is configured as a second shaft shoulder, and the fourth limiting portion 20213 is configured as a second boss protruding towards the second screw rod 221; or, the first limiting portion 1213 is configured as a first shaft shoulder, the third limiting portion 20113 is configured as a first boss protruding towards the first screw rod 121, and the second limiting portion 2213 is configured as a second shaft shoulder, and the fourth limiting portion 20213 is configured as a second boss protruding towards the second screw rod 221.

[0111] It can be understood that the first shaft shoulder protrudes outward along the radial direction of the first screw rod 121, so that the first shaft shoulder can be axially blocked by the first boss protruding towards the first screw rod 121, thereby limiting the axial displacement of the first screw rod 121; and the second shaft shoulder protrudes outward along the radial direction of the second screw rod 221, so that the second shaft shoulder can be axially blocked by the second boss protruding towards the second screw rod 221, thereby limiting the axial displacement of the second screw rod 221.

[0112] In some embodiments, as shown in FIGS. 1 and 2, the first driving force transmission assembly 11 further comprises a first transmission belt 113, which is in driving connection with the first transmission wheel 111 and the second transmission wheel 112, respectively; or, the second driving force transmission assembly 21 further comprises a second transmission belt 213, which is in driving connection with the third transmission wheel 211 and the fourth transmission wheel 212, respectively; or, the first driving force transmission assembly 11 further comprises a first transmission belt 113, which is in driving connection with the first transmission wheel 111 and the second transmission wheel 112, respectively, and the second driving force transmission assembly 21 further comprises a second transmission belt 213, which is in driving connection with the third transmission wheel 211 and the fourth transmission wheel 212, respectively.

[0113] It can be understood that, as the transmission medium, the first transmission belt 113 and the second transmission belt 213 can respectively transmit the power on the first transmission wheel 111 and the third transmission wheel 211 to the second transmission wheel 112 and the fourth transmission wheel 212, so that the power transmission effect can be smoothly achieved. The transmission belt has good elasticity, which can buffer and absorb vibration, so that the transmission process is stable and noiseless; the transmission belt will slip on the pulley under overload condition, which can also protect other components and avoid damage caused by overload; and the transmission belt also has the advantages of simple structure, low cost and convenient maintenance. Therefore, the arrangement form of the transmission belt can effectively improve the practicability, safety and economy of the wheel steering device 100.

[0114] In some embodiments, the first transmission mechanism 1 and the second transmission mechanism 2 are distributed along the connecting direction of the first wheel and the second wheel. In this way, the first transmission mechanism 1 and the second transmission mechanism 2 can make full use of the axial space between the first wheel and the second wheel, shorten the space occupied by the two in the direction perpendicular to the connecting direction of the first wheel and the second wheel, and improve the arrangement rationality.

[0115] In some embodiments, as shown in FIGS. 1 and 2, the wheel steering device 100 further comprises a first driving member 94 and a second driving member 95. The first driving member 94 is arranged in the housing 200, and the first driving member 94 is connected with the first transmission mechanism 1. The second driving member 95 is arranged in the housing 200, and the second driving member 95 is connected with the second transmission mechanism 2.

[0116] For example, the first driving member 94 can provide a power source, the first driving member 94 first drives the first driving force transmission assembly 11 to work, the first driving force transmission assembly 11 gradually transmits the power to the first transmission rod assembly 12, and the first transmission rod assembly 12 transmits the power to the first screw rod sleeve 122 of the first screw rod 121. At this time, the internal thread on the first screw rod sleeve 122 and the external thread on the first screw rod 121 rotate relatively, and because the circumferential rotation of the first screw rod 121 is limited, the first screw rod 121 can move along the axial direction of itself.

[0117] For another example, the second driving member 95 can provide a power source, the second driving member 95 first drives the second driving force transmission assembly 21 to rotate, the second driving force transmission assembly 21 transmits the power to the second transmission rod assembly 22, and the second transmission rod assembly 22 transmits the power to the second screw rod sleeve 222 of the second screw rod 221. At this time, the internal thread on the second screw rod sleeve 222 and the external thread on the second screw rod 221 rotate relatively, and because the circumferential rotation of the second screw rod 221 is limited, the second screw rod 221 can move along the axial direction of itself.

[0118] In some embodiments, as shown in FIGS. 1 and 2, the first driving member 94 and the second driving member 95 are respectively installed on opposite sides of the housing 200. The opposite sides of the housing 200 are respectively provided with a first through hole and a second through hole. The first driving member 94 has a first driving shaft, the first driving shaft extends into the first mounting space 2011 through the first through hole, and the first driving shaft is connected with the first transmission mechanism 1. The second driving member 95 has a second driving shaft, the second driving shaft extends into the second mounting space 2021 through the second through hole, and the second driving shaft is connected with the second transmission mechanism 2.

[0119] As shown in FIG. 1, the first driving shaft and the second driving shaft extend along the left-right direction, and the left and right sides of the housing 200 are provided with the first through hole and the second through hole allowing the first driving shaft and the second driving shaft to pass through. Moreover, the first driving shaft enters the first mounting space 2011 of the housing 200 after passing through the first through hole, and then the first driving shaft is in transmission connection with the first transmission mechanism 1. In this way, the power on the first driving member 94 can be smoothly transmitted to the first wheel, so as to achieve the effect of independently controlling the steering of the first wheel. The second driving shaft enters the second mounting space 2021 of the housing 200 after passing through the second through hole, and then the second driving shaft is in transmission connection with the second transmission mechanism 2. In this way, the power on the second driving member 95 can be smoothly transmitted to the second wheel, so as to achieve the effect of independently controlling the steering of the second wheel, thereby effectively increasing the steering scenarios of the wheels.

[0120] In some embodiments, as shown in FIG. 2, the housing 200 comprises a main housing portion 204 and a protrusion 205. The protrusion 205 is arranged at the middle of the length direction (e.g. left-right direction) of the main housing portion 204 and protrudes from the outer circumferential surface of the main housing portion 204. The protrusion 205 and the main housing portion 204 jointly form the first mounting space 2011 and the second mounting space 2021, and the first driving member 94 and the second driving member 95 are respectively arranged at the opposite sides of the protrusion 205.

[0121] It can be understood that the protrusion 205 can be used to accommodate the first part of the first driving force transmission assembly 11 and the first part of the second driving force transmission assembly 21, and the main housing portion 204 of the housing 200 can be used to accommodate the first transmission rod assembly 12, the second transmission rod assembly 22, the second part of the first driving force transmission assembly 11 and the second part of the second driving force transmission assembly 21, so that each assembly can be reasonably accommodated. Moreover, the opposite sides of the protrusion 205 are left with corresponding spaces, and the first driving member 94 and the second driving member 95 are respectively arranged at the opposite sides of the protrusion 205. In this way, the structure of the vehicle wheel steering device 100 can be more compact without increasing the axial dimension. The opposite sides of the protrusion 205 can be correspondingly provided with the first through hole and the second through hole.

[0122] Some embodiments of the present disclosure also provide a vehicle 300. As shown in FIG. 6, the vehicle 300 comprises a first wheel, a second wheel and the above-mentioned vehicle wheel steering device 100. In this way, the vehicle with the vehicle wheel steering device 100 can improve the lightweight effect and structural compactness of itself.

[0123] In the description of the present disclosure, it should be understood that the terms "center", "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0124] In the description of the present disclosure, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0125] In the description of the disclosure, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the disclosure. In the description of the disclosure, the exemplary description of the above terms does not necessarily mean the same embodiment or example.

[0126] Although the embodiments of the disclosure have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the disclosure, and the scope of the disclosure is defined by the claims and their equivalents.

Claims

1. A housing (200) of a wheel steering device, comprising a first housing (201) and a second housing (202), wherein a mounting space is formed between the first housing (201) and the second housing (202), and the mounting space is adapted to accommodate a first transmission mechanism (1) for independently steering a first wheel and a second transmission mechanism (2) for independently steering a second wheel.

2. The housing (200) of a vehicle wheel steerer according to claim 1, wherein, The mounting space comprises: a first mounting space (2011) formed in the first housing (201), the first mounting space (2011) being adapted to accommodate the first transmission mechanism (1); and a second mounting space (2021) formed in the second housing (202), the second mounting space (2021) being adapted to accommodate the second transmission mechanism (2); wherein the first housing (201) is connected to the second housing (202), and the first mounting space (2011) and the second mounting space (2021) are in communication.

3. The housing (200) of a vehicle wheel steerer according to claim 2, wherein, The first housing (201) and the second housing (202) are sealingly connected. 4.The housing (200) of the wheel steering device according to claim 3, further comprising: a sealing member (203) sealingly connected to the first housing (201) and the second housing (202) respectively; wherein at least one of the first housing (201) or the second housing (202) is provided with a sealing groove (2023) for accommodating the sealing member (203).

5. The housing (200) of a vehicle wheel steerer according to claim 2, wherein, The first housing (201) and the second housing (202) are connected by fasteners. 6.A wheel steering device (100), comprising: the housing (200) of the wheel steering device according to any one of claims 1 to 5; the first transmission mechanism (1); and the second transmission mechanism (2). The first transmission mechanism (1) comprises a first driving force transmission assembly (11) and a first transmission rod assembly (12), the first driving force transmission assembly (11) being drivingly connected to the first transmission rod assembly (12), and the first transmission rod assembly being configured to steer the first wheel; 7. The wheel steerer (100) according to claim 6, wherein The second transmission mechanism (2) comprises a second driving force transmission assembly (21) and a second transmission rod assembly (22), the second driving force transmission assembly (21) being drivingly connected to the second transmission rod assembly (22), and the second transmission rod assembly (22) being configured to steer the second wheel. The first driving force transmission assembly (11) is connected to one end of the first transmission rod assembly (12) adjacent to the second transmission rod assembly (22), and the second driving force transmission assembly (21) is connected to one end of the second transmission rod assembly (22) adjacent to the first transmission rod assembly (12).

8. The wheel steerer (100) according to claim 7, wherein The first housing (201) and the second housing (202) satisfy at least one of the following conditions:

9. The wheel steerer (100) according to claim 8, wherein, ​ The cross-sectional area of the side of the first housing (201) away from the second housing (202) along the axial direction is smaller than the cross-sectional area of the side of the first housing (201) close to the second housing (202) along the axial direction, and the first driving force transmission assembly (11) is arranged in the mounting space on the side of the first housing (201) close to the second housing (202) along the axial direction; or The cross-sectional area of the side of the second housing (202) away from the first housing (201) along the axial direction is smaller than the cross-sectional area of the side of the second housing (202) close to the first housing (201) along the axial direction, and the second driving force transmission assembly (21) is arranged in the mounting space on the side of the second housing (202) close to the first housing (201) along the axial direction.

10. The wheel steerer (100) of claim 7, wherein, The first driving force transmission assembly (11) and the second driving force transmission assembly (21) satisfy at least one of the following: The first driving force transmission assembly (11) comprises a first transmission wheel (111) and a second transmission wheel (112), the second transmission wheel (112) is in transmission connection with the first transmission wheel (111) and is located on the side of the first transmission wheel (111) in the radial direction, and the second transmission wheel (112) is in transmission connection with the first transmission rod assembly (12); or The second driving force transmission assembly (21) comprises a third transmission wheel (211) and a fourth transmission wheel (212), the fourth transmission wheel (212) is in transmission connection with the third transmission wheel (211) and is located on the side of the third transmission wheel (211) in the radial direction, and the fourth transmission wheel (212) is in transmission connection with the second transmission rod assembly (22).

11. The wheel steerer (100) according to claim 10, wherein, The first transmission rod assembly (12) and the second transmission rod assembly (22) satisfy at least one of the following: The first transmission rod assembly (12) comprises a first lead screw (121) and a first lead screw sleeve (122), one end of the first lead screw (121) close to the second transmission rod assembly (22) is in threaded connection with the first lead screw sleeve (122), the second transmission wheel (112) is in transmission connection with the first lead screw sleeve (122), and the second transmission wheel (112) is configured to drive the first lead screw sleeve (122) to rotate to drive the first lead screw (121) to move, thereby driving the first wheel to steer; or The second transmission rod assembly (22) comprises a second lead screw (221) and a second lead screw sleeve (222), one end of the second lead screw (221) close to the first transmission rod assembly (12) is in threaded connection with the second lead screw sleeve (222), the fourth transmission wheel (212) is in transmission connection with the second lead screw sleeve (222), and the fourth transmission wheel (212) is configured to drive the second lead screw sleeve (222) to rotate to drive the second lead screw (221) to move, thereby driving the second wheel to steer.

12. The wheel steerer (100) of claim 6, wherein, The first transmission mechanism (1) comprises a first lead screw (121); and the second transmission mechanism (2) comprises a second lead screw (221). The first screw rod (121) is provided with a avoiding space (1211), and the second screw rod (221) is provided with a matching part (2211) which can extend into the avoiding space (1211).

13. The wheel steerer (100) according to claim 12, wherein, The matching part (2211) is configured to be spaced apart from the inner wall of the avoiding space (1211) when the matching part (2211) extends into the avoiding space (1211).

14. The wheel steering gear (100) according to claim 12, wherein, The first transmission mechanism (1) further comprises a first screw rod sleeve (122), the first screw rod (121) is in threaded cooperation with the first screw rod sleeve (122), and the first screw rod sleeve (122) rotates to drive the first screw rod (121) to move; The second transmission mechanism (2) further comprises a second screw rod sleeve (222), the second screw rod (221) is in threaded cooperation with the second screw rod sleeve (222), and the second screw rod sleeve (222) rotates to drive the second screw rod (221) to move; The second screw rod sleeve (222) is provided with a containing space (2221) at one end adjacent to the first screw rod (121), and the one end of the first screw rod (121) adjacent to the second screw rod (221) can extend into the containing space (2211).

15. The vehicle wheel steerer (100) of claim 14, wherein, The first screw rod (121) is configured to be spaced apart from the inner wall of the containing space (2211) when the one end of the first screw rod (121) adjacent to the second screw rod (221) extends into the containing space (2211).

16. The wheel steering gear (100) according to claim 11, at least one of the following is satisfied: The second transmission wheel (112) is sleeved on the first screw rod sleeve (122) and is in interference fit with the first screw rod sleeve (122); or The fourth transmission wheel (212) is sleeved on the second screw rod sleeve (222) and is in interference fit with the second screw rod sleeve (222).

17. The wheel steering gear (100) according to claim 11, further comprising at least one of the following: A first bearing (3) is arranged in a first mounting space (2011), and the first screw rod sleeve (122) is arranged through the first bearing (3); or A second bearing (4) is arranged in a second mounting space (2021), and the second screw rod sleeve (222) is arranged through the second bearing (4).

18. The wheel steering gear (100) according to claim 11, further comprising at least one of the following: A third bearing (9) is arranged in a first mounting space (2011), the first screw rod (121) is arranged through the third bearing (9), and the third bearing (9) is arranged at an end of the first screw rod (121) away from the second screw rod (221); or A fourth bearing (91) is arranged in a second mounting space (2021), and the second lead screw (221) penetrates through the fourth bearing (91), and the fourth bearing (91) is arranged at an end of the second lead screw (221) away from the first lead screw (121).

19. The wheel steering gear (100) according to claim 11, further comprising: A first limiting member (92) is mounted to one of the housing (200) and the first lead screw (121), and the first limiting member (92) and the other of the housing (200) and the first lead screw (121) are movably matched along the axial direction of the first lead screw (121); and A second limiting member (93) is mounted to one of the housing (200) and the second lead screw (221), and the second limiting member (93) and the other of the housing (200) and the second lead screw (221) are movably matched along the axial direction of the second lead screw (221).

20. The wheel steering gear (100) according to claim 19, wherein An inner wall of the first mounting space (2011) is provided with a first sliding groove extending along the axial direction of the first lead screw (121), and the first limiting member (92) is mounted to the first lead screw (121) and matched with the first sliding groove; and An inner wall of the second mounting space (2021) is provided with a second sliding groove extending along the axial direction of the second lead screw (221), and the second limiting member (93) is mounted to the second lead screw (221) and matched with the second sliding groove.

21. The wheel steering gear (100) according to claim 20, wherein The first lead screw (121) is configured with a first mounting hole (1212) penetrating through in the radial direction of the first lead screw (121), and the first limiting member (92) penetrates through the first mounting hole (1212); and The second lead screw (221) is configured with a second mounting hole (2212) penetrating through in the radial direction of the second lead screw (221), and the second limiting member (93) penetrates through the second mounting hole (2212). The first lead screw (121) is provided with a first limiting portion (1213), the second lead screw (221) is provided with a second limiting portion (2213), an inner wall of the first mounting space (2011) is provided with a third limiting portion (20113), and an inner wall of the second mounting space (2021) is provided with a fourth limiting portion (20213); 22. The wheel steerer (100) of claim 11, wherein, The third limiting portion (20113) is configured to limit the movement of the first lead screw (121) in the direction away from the second lead screw (221) by stopping the first limiting portion (1213); and The fourth limiting portion (20213) is configured to limit the movement of the second lead screw (221) in the direction away from the first lead screw (121) by stopping the second limiting portion (2213). ​ 23. The vehicle wheel steering device (100) according to claim 22, wherein at least one of the following is satisfied: the first limiting portion (1213) is configured as a first shaft shoulder, and the third limiting portion (20113) is configured as a first boss protruding toward the first screw rod (121); or the second limiting portion (2213) is configured as a second shaft shoulder, and the fourth limiting portion (20213) is configured as a second boss protruding toward the second screw rod (221).

24. The vehicle wheel steering device (100) according to claim 10, wherein at least one of the following is satisfied: the first driving force transmission assembly (11) further comprises a first transmission belt (113) in driving connection with the first transmission wheel (111) and the second transmission wheel (112), respectively; or the second driving force transmission assembly (21) further comprises a second transmission belt (213) in driving connection with the third transmission wheel (211) and the fourth transmission wheel (212), respectively.

25. The wheel steerer (100) of claim 6, wherein, the first transmission mechanism (1) and the second transmission mechanism (2) are distributed along a line direction of the first wheel and the second wheel.

26. The vehicle wheel steering device (100) according to any one of claims 6 to 25, further comprising: a first driving member (94) disposed on the housing (200) and connected with the first transmission mechanism (1); and a second driving member (95) disposed on the housing (200) and connected with the second transmission mechanism (2). the first driving member (94) and the second driving member (95) are respectively mounted on opposite sides of the housing (200), the opposite sides of the housing (200) are respectively provided with a first through hole and a second through hole, the first driving member (94) has a first driving shaft passing through the first through hole and located in a first mounting space (2011) and connected with the first transmission mechanism (1), and the second driving member (95) has a second driving shaft passing through the second through hole and located in a second mounting space (2021) and connected with the second transmission mechanism (2).

27. The wheel steerer (100) according to claim 26, wherein, the housing (200) comprises:

28. The wheel steerer (100) of claim 26, wherein, a main housing portion (204); and a protrusion (205) disposed at a middle portion of a length direction of the main housing portion (204) and protruding from an outer circumferential surface of the main housing portion (204), the protrusion (205) and the main housing portion (204) together form the first mounting space (2011) and the second mounting space (2021), and the first driving member (94) and the second driving member (95) are respectively mounted on opposite sides of the protrusion (205).

29. A vehicle (300) comprising: a first wheel; a second wheel; and a vehicle wheel steering device (100) according to any one of claims 6 to 28. ​ ​

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