A steering control structure external to a steering gearbox

Abstract

The present invention relates to a steering control structure externally mounted on a steering gearbox, comprising a steering drive mechanism, a steering follower mechanism, an auxiliary drive gearbox, and a first triggering device; the steering drive mechanism and the steering follower mechanism are externally mounted on the auxiliary drive gearbox; the steering follower mechanism is mounted on the power output end of the auxiliary drive gearbox; the first triggering device comprises a first switch device and a first triggering portion, the first switch device and the first triggering portion being mounted on the steering drive mechanism and the steering follower mechanism, respectively; when the steering drive mechanism rotates clockwise or counterclockwise, the relative positions of the first switch device and the first triggering portion change, causing the first switch device to be triggered and start the auxiliary drive gearbox, thereby driving the steering follower mechanism to perform steering. The steering control structure externally mounted on the steering gearbox of the present invention adopts a control structure externally mounted on the auxiliary steering gearbox to achieve steering assistance, has a compact overall structure, a reasonable design, and is easy to install, repair, and replace.

Description

Technical Field

[0001] The present invention relates to the field of riding baby carriages, and in particular to a steering control structure externally arranged on a steering gear box. Background Art

[0002] Children's strollers are electric toy cars for young children. Steering requires the child to control the steering wheel. However, the steering mechanisms of current strollers are very heavy, making it difficult for children with limited arm strength to independently control the vehicle. As living standards improve, consumers have increasingly sophisticated demands for strollers. These vehicles are becoming larger, and the use of relatively quiet foam and rubber tires further increases steering resistance, necessitating a corresponding power steering mechanism to assist with steering.

[0003] In the prior art, a steering gearbox and related structures are usually used to assist steering.

[0004] Among them, one is to use Hall sensors and magnetic field to act on the steering motor to achieve power assistance. One group is installed between the steering wheel and the vehicle body, and the other group is installed in the steering gear box. The Hall sensor is located at the position of the magnetic field to obtain an electric potential value. When the upper and lower sets of electric potential values ​​are consistent, it is determined that the structural direction is consistent, and the center position of the north pole and south pole of the magnetic field is the front position. This structure is relatively expensive, and the existing magnet magnetization process cannot ensure that the magnetic field at the center position of the north pole and south pole of the magnetic field is the same value, which makes its implementation very difficult.

[0005] Another approach uses a reverse-beam light-controlled electronic component to activate the steering motor for power. This control structure includes a reverse-beam light-emitting PCB, a reverse-beam light-sensing PCB, and a light-shielding plate with a curved light-transmitting slot located between the two. Two sets of components are also required: one mounted on the upper half of the gearbox, and the other on the lower half. The reverse-beam light-sensing electronic components on either side of the light-shielding plate generate different digital signals through the light-emitting and light-sensing tubes on the receiving PCB. When the two signals match, the steering direction is determined to be consistent. However, in actual application, the calculation of the left and right turning angles is based on the arc-shaped transmission grooves in the light-isolating plate to determine the turning position, that is, the light-transmitting grooves of different curvatures are located in different dimensions of the shading plate to form a so-called digital disk. The light-emitting PCB board and the photosensitive PCB board obtain different digital signals through the digital disk. Two curvatures can only determine one position on the left or right. The combination of five curvatures can determine a maximum of four positions on the left and right. The left and right turning angles are both 40 degrees per column, with an accuracy of 10 degrees per position, which is poor. In addition, two groups of light-emitting tubes and receiving tubes corresponding to the light-transmitting grooves are required, that is, the upper group requires at least 5 light-emitting tubes and 5 photosensitive tubes; the lower group also requires at least 5 light-emitting tubes and 5 photosensitive tubes; 20 electronic components If any one of them is damaged or malfunctions, the structure will not work properly; its structure is too complicated and the cost is too high, making it difficult to promote in the market. At the same time, there are also the following problems: 1. The structure is located inside the gear box, which increases the difficulty of maintenance. Customers often need to discard the gear box together and replace it with a new one, which increases maintenance costs and waste of raw materials; 2. The collection of two sets of data depends on the precise position and precise alignment of the light-emitting tube, the receiving tube, and the digital disk. A tension spring is used to directly pull the digital disk; the tension of the tension spring acts on the digital disk for a long time, which will cause the digital disk to deform and affect the reading accuracy; 3. The tension spring occupies a large space, which increases the volume of the structure and does not match the position and space on the stroller; 4. The clutch structure is too complicated.

[0006] In summary, the two existing power steering structures for children's bicycles are complex in structure, high in cost, and difficult to implement; there is an urgent need for a structure that is simple in structure, low in cost, and easy to implement. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a steering control structure external to the steering gearbox, which adopts the control structure external to the auxiliary steering gearbox to achieve steering assistance. The overall structure is compact, the design is reasonable, and it is easy to install, maintain and replace.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a steering control structure externally mounted on a steering gearbox, comprising a steering drive mechanism, a steering follower mechanism, an auxiliary drive gearbox, and a first triggering device; the steering drive mechanism and the steering follower mechanism are externally mounted on the auxiliary drive gearbox; the steering follower mechanism is mounted on the power output end of the auxiliary drive gearbox; the first triggering device comprises a first switch device and a first triggering portion, the first switch device and the first triggering portion being mounted on the steering drive mechanism and the steering follower mechanism, respectively; the steering drive mechanism is configured to rotate clockwise or counterclockwise in response to a right steering operation or a left steering operation, thereby changing the relative position of the first switch device and the first triggering portion; the first triggering device is configured to not be triggered when the positions of the first switch device and the first triggering portion are relatively fixed, and to be triggered when the positions of the first switch device and the first triggering portion change relative to each other; the first triggering device is further configured to activate the auxiliary drive gearbox via the first switch device when triggered; and the auxiliary drive gearbox is configured to drive the steering follower mechanism to rotate in the same direction as the steering drive mechanism after activation, thereby implementing the corresponding left steering function or right steering function.

[0009] Furthermore, the first switch device includes two trigger positions spaced apart from each other; the two trigger positions are used to control the clockwise and counterclockwise power outputs of the auxiliary drive gearbox, respectively; the first trigger portion corresponding to one trigger position is located on the clockwise side of the trigger position, and the first trigger portion corresponding to the other trigger position is located on the counterclockwise side of the trigger position; the first trigger portion and the first switch device are configured such that when the relative position of the first switch device and the first trigger portion changes, one of the two trigger positions is triggered by the first trigger portion; the trigger position has a first switch, the first switch including a micro switch or a proximity switch; the proximity switch is a photoelectric switch or a Hall switch;

[0010] The two trigger positions are located on the same circumference, and the two first trigger portions are integrated and arranged at the interval between the two trigger positions;

[0011] Alternatively, the two trigger positions are located on different circumferences, and each first trigger portion is located on the same circumference as the corresponding trigger position.

[0012] Furthermore, the first switch device also includes a first switch mounting plate, and the trigger position is fixed on the switch mounting plate; the driven disk is also provided with a first switch mounting groove; the first switch mounting plate is installed in the first switch mounting groove; the first trigger part is a boss provided on the driving disk seat; the corresponding side surface of the boss in the rotation direction is close to the first switch at the corresponding trigger position; the first switch mounting groove is provided at the bottom surface of the driven disk; or, the first switch mounting groove is provided on the first cover.

[0013] The first switch is a photoelectric switch comprising a light emitting element and a light sensing element. The bottom surface of the boss, which serves as the first triggering portion, is configured as a reflective surface. The reflective surface is configured to reflect light from the light emitting element, and the light sensing element is configured to be triggered by receiving the light reflected by the reflective surface. When the relative positions of the driving disc and the driven disc change due to rotation, the reflective surface of the boss moves to a triggering position, and the light sensing element is triggered by receiving the light reflected by the light emitting element, thereby starting the auxiliary drive gearbox.

[0014] Alternatively, the first switch is a photoelectric switch; the photoelectric switch includes a light emitting element and a light sensing element; the top surfaces of the grooves on both sides of the boss serving as the first triggering portion are configured as reflective surfaces; the reflective surfaces are configured to reflect light from the light emitting element, and the light sensing element is configured to receive light reflected by the reflective surfaces; the boss is configured to shield the light from the light emitting element when the relative positions of the driving disc and the driven disc change due to rotation, so that the light sensing element no longer receives the reflected light and is triggered, thereby starting the auxiliary drive gearbox;

[0015] Alternatively, the first switch is a micro switch; the boss of the first trigger portion is used to touch and press down the contacts on the micro switch when the relative positions of the driving disk and the driven disk change due to rotation, so that the micro switch is closed and the auxiliary drive gearbox is started.

[0016] Furthermore, the auxiliary drive gearbox has a gearbox shaft sleeve portion and a drive connecting portion sleeved on the gearbox shaft sleeve portion; the drive connecting portion serves as the power output end of the auxiliary drive gearbox; the steering drive mechanism includes a first steering shaft and a driving disc; the steering driven mechanism includes a second steering shaft, a driven disc, and a first cover; the driving disc includes a driving disc seat and a first shaft sleeve fixed to the driving disc seat; the driven disc includes a driven disc body and a second shaft sleeve arranged on the driven disc body, and a first mounting groove is provided in the driven disc body; the first cover includes a cover body; the cover body is provided with a first mounting hole; the The first steering shaft and the second steering shaft are coaxially distributed; the driving disc is sleeved on the first steering shaft through a first sleeve and is circumferentially fixed to the first steering shaft; the driven disc is sleeved on the second steering shaft through a second sleeve and is circumferentially fixed to the second steering shaft; the driving disc is located in the first mounting groove of the driven disc, and the opening of the first mounting groove of the driven disc is fixed to the first cover; the first cover is used to axially fix the driving disc and the driven disc, and the auxiliary driving gear box is sleeved on the first sleeve through the gear box sleeve portion; the auxiliary driving gear box is also sleeved on the outside of the driven disc through a driving connecting portion and is circumferentially fixed to the driven disc.

[0017] Furthermore, the driving disc and the first steering shaft are circumferentially fixed in the following manner: a first groove is provided on the bottom side of the first sleeve of the driving disc; the first steering shaft includes a first steering shaft body and a first clip located on the bottom side of the first steering shaft body; the first steering shaft is inserted into the first sleeve from bottom to top, and the first clip of the first steering shaft is embedded in the first groove of the driving disc, so that the first steering shaft and the driving disc are circumferentially fixed; the driven disc and the second steering shaft are circumferentially fixed in the following manner: a second groove is provided on the bottom side of the second sleeve of the driven disc, and a radial second fixing hole is provided at the side wall of the second sleeve; the second steering shaft includes a second steering shaft body and a second clip located near the top end of the second steering shaft body, and the second steering shaft body is provided with a first fixing hole at a position above the second clip; the top end of the second steering shaft body is inserted into the second axial hole of the second sleeve, and the second clip is inserted into the second groove, so that the driven disc and the second steering shaft are circumferentially fixed; the first fixing hole corresponds to the second fixing hole and is connected by a connecting member, so that the driven disc and the second steering shaft are axially fixed.

[0018] Furthermore, a first wire passing groove is provided on the side of the driven disk at a position close to the first switch mounting groove; a second wire passing groove is provided on the side of the first cover at a position corresponding to the first wire passing groove; a first wire passing hole is also provided on the drive connecting part; a second wire passing hole is provided on the drive gear box at a position corresponding to the first wire passing hole; the corresponding lead wires of the first switch pass through the first wire passing groove, the second wire passing groove, the first wire passing hole and the second wire passing hole in sequence and then are led out; a first rotation limiting part is also provided on the top side of the drive connecting part, and the drive gear box is respectively provided with second rotation limiting parts in the clockwise and counterclockwise directions of the first rotation limiting part, and the two second rotation limiting parts cooperate with the first rotation limiting part to limit the clockwise and counterclockwise rotation angles of the drive connecting part; when the first rotation limiting part is between the two second rotation limiting parts, the first wire passing hole and the second wire passing hole remain in a connected state.

[0019] Furthermore, the steering control structure further includes a force storage reset mechanism; the force storage reset mechanism acts on the steering drive mechanism, and is used to store force when the steering drive mechanism receives a right steering operation or a left steering operation and rotates, and is also used to drive the steering drive mechanism to rotate in the opposite direction and return to the initial position when the steering drive mechanism loses the force of the left steering operation or the left steering operation;

[0020] The force storage reset mechanism includes an installation space, a torsion spring located in the installation space, a torsion spring fixing block, and a torsion spring shifting block; the two torsion arms of the torsion spring are respectively arranged on both sides of the torsion spring fixing block after crossing; the torsion spring shifting block is arranged between the two torsion arms of the torsion spring; the torsion spring fixing block does not rotate with the driving disk; the torsion spring shifting block rotates with the driving disk; the torsion spring is used to store force due to the change in the distance between the two torsion arms under the combined action of one torsion arm being driven by the torsion spring shifting block and the other torsion arm being limited by the torsion spring fixing block when the torsion spring shifting block rotates with the driving disk;

[0021] and a gear engaged with the first gear and the gear engaged with the first gear and the gear engaged with the first gear and the gear engaged with the first gear.

[0022] Alternatively, the installation space is arranged at the top end of the gear box shaft sleeve portion; the force storage reset mechanism also includes a torsion spring reset disk; the driving gear box is provided with a reset disk mounting groove at the top end of the gear box shaft sleeve portion, and the top surface of the reset disk mounting groove is also provided with a second cover; the installation space is formed between the second cover and the reset disk mounting groove; the torsion spring reset disk includes a reset disk seat and a third shaft sleeve fixed on the reset disk seat; the torsion spring reset disk is sleeved on the first shaft sleeve of the driving disk through the third shaft sleeve and is circumferentially fixed to the first shaft sleeve; the torsion spring reset disk is also installed in the reset disk mounting groove through the reset disk seat; the torsion spring fixing block is arranged at the inner wall of the reset disk mounting groove; the torsion spring shift block is arranged on the reset disk seat; the torsion spring is sleeved on the third shaft sleeve;

[0023] Furthermore, the steering control structure further includes a second trigger device; the second trigger device includes a second switch device and a second trigger part; one of the second switch device and the second trigger part is fixedly mounted and does not rotate with the drive disc, and the other is rotated with the drive disc; the second switch device and the second trigger part are configured to correspond in position when the drive disc is in the forward direction and not correspond in position when the drive disc is in the reverse direction; the second trigger device is configured to switch the auxiliary drive gearbox between a low-speed state and a high-speed state by means of the position correspondence and non-correspondence of the second switch device and the second trigger part; the second trigger part is a bump, and the second switch device further includes a second switch mounting plate; the second switch is fixed to the second switch mounting plate; the second switch device is fixed via a second switch mounting slot; the second switch is a micro switch or a proximity switch; the proximity switch is a photoelectric switch or a Hall switch;

[0024] When the installation space is provided between the driving disk and the fixed disk, the second trigger portion is provided on the top surface of the torsion spring block of the driving disk; the second installation slot is provided on the fixed disk; and the contact of the second switch of the second switch device passes downward through the fixed disk and engages with the protrusion of the second trigger portion.

[0025] Alternatively, when the installation space is arranged at the top end of the gear box shaft sleeve portion, the second trigger portion is arranged on the outer side surface of the torsion spring reset disk; the second installation groove is arranged on the inner side surface of the gear box bottom shell reset disk installation groove; the contact of the second switch of the second switching device is inwardly matched with the protrusion of the second trigger portion.

[0026] Furthermore, the steering control structure is further provided with a corresponding rotation angle limiting mechanism, which is a combination of one or more of a plurality of rotation angle limiting mechanisms; the plurality of rotation angle limiting mechanisms include:

[0027] First rotation angle limiting mechanism: The angle limiting mechanism between the drive plate and the gearbox sleeve is as follows: the gearbox sleeve has a third axial hole, the inner wall of which is further provided with a second angle limiting groove; the outer wall of the first sleeve is further provided with a first protrusion; the first protrusion is configured to rotate within the range of the second angle limiting groove as the drive plate rotates;

[0028] Second rotation angle limiting mechanism: The angle limiting mechanism between the driving plate and the fixed plate comprises: a first angle limiting groove is further provided on the inner wall of the first shaft hole of the fixed plate; a first protrusion is further provided on the outer wall of the first sleeve; the first protrusion is configured to rotate within the range of the first angle limiting groove as the driving plate rotates;

[0029] The third rotation angle limiting mechanism: The angle limiting mechanism between the first cover and the fixed plate is as follows: a third angle limiting groove is provided on the inner wall of the first mounting hole of the first cover; a circular convex ring is provided on the fixed plate; and a second protrusion is provided on the side wall of the circular convex ring. The first cover is mounted on the circular convex ring through the first mounting hole, and the second protrusion cooperates with the third angle limiting groove. When the driven plate rotates, the third angle limiting groove rotates with the first cover, and the rotation angle of the third angle limiting groove is limited by the second protrusion.

[0030] Fourth rotation angle limiting mechanism: The limiting structure between the driving disk and the driven disk is as follows: a third rotation limiting portion is provided on the bottom surface of the first mounting slot of the driven disk; a fourth rotation limiting portion is provided on the bottom surface of the driving disk; the third rotation limiting portion cooperates with the fourth rotation limiting portion to limit the relative rotation angle of the driving disk and the driven disk;

[0031] Fifth rotation angle limiting mechanism: The driving disk is further provided with a fifth rotation limiting portion at a position corresponding to the torsion spring fixing block on the fixed disk; the fifth rotation limiting portion cooperates with both sides of the torsion spring fixing block to limit the rotation angle of the driving disk relative to the fixed disk;

[0032] Sixth rotation angle limiting mechanism: a third rotation limiting portion is provided on the bottom surface of the first mounting groove of the driven disk; a sixth rotation limiting portion is provided on the bottom edge of the fixed disk body of the fixed disk; the sixth rotation limiting portion cooperates with the third rotation limiting portion to limit the rotation angle of the driven disk relative to the fixed disk.

[0033] Furthermore, the steering control structure further includes a clutch mechanism; the clutch mechanism includes a clutch member, a first clutch channel provided on the driven disc, and a second clutch channel provided on the driving disc; the clutch member is configured to pass through the first clutch channel and be inserted into the second clutch channel to circumferentially fix the driving disc and the driven disc, or to remain in the first clutch channel and not enter the second clutch channel, thereby allowing the driving disc and the driven disc to have the freedom of circumferential relative movement;

[0034] In which, the clutch member is a slider; the first clutch channel is a slideway cooperating with the slider; the second clutch channel is a slide groove cooperating with the slider; the slider includes a slider body, and an elastic member is also provided on the slider body; the elastic member is also provided with a first clamping portion on the mating surface with the first clutch channel; the second clutch channel is also provided with a second clamping portion and a third clamping portion on the mating surface with the elastic member; the second clamping portion is used to clamp the first clamping portion when the clutch member extends into the second clutch channel, so that the clutch member maintains the state of extending into the second clutch channel; the third clamping portion is used to clamp the first clamping portion when the clutch member does not extend into the second clutch channel, so that the clutch member remains in the first clutch channel, neither entering the second clutch channel nor sliding out of the first clutch channel.

[0035] Alternatively, the clutch member is a screw; the first clutch channel is a screw hole that cooperates with the screw; the second clutch channel is a hole groove that cooperates with the screw; and switching between entering the second clutch channel state and leaving the second clutch channel state is achieved by rotating the screw in and out.

[0036] Advantages of the present invention: A steering control structure of the present invention is externally placed on a steering gearbox, and a steering follower mechanism and a steering drive mechanism externally placed on an auxiliary steering gearbox are used to realize a steering assist function by utilizing a first trigger device; by designing two trigger positions of the first trigger device and the first trigger part, the structure of the control end is greatly simplified, and implementation is facilitated; the specific implementation of the external installation is realized by structures such as a driving plate, a fixed plate, a driven plate, and a first cover, and the overall structure is compact and the movement process is stable; the corresponding force storage reset mechanism is designed by means of a torsion spring, which is smaller in size and more reasonable in design; the corresponding clutch structure is adopted, which acts on the driving plate and the driven plate through the clutch structure, and is more firm and reliable; the design of the second trigger device realizes the switching of high and low speed states of the steering assist, so that when the steering wheel returns to the forward direction, the steering changes from high speed to low speed. Since the steering assist is delayed from taking effect after the steering wheel operation, it changes from a high speed state to a low speed state, which is easier to maintain stability and ensure the accuracy of the steering; the overall structure is compact, the design is reasonable, and it is easy to install, repair and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a three-dimensional schematic diagram of the steering control structure of Example 1;

[0038] Figure 2 is a three-dimensional schematic diagram of the steering control structure of Example 1 from another angle;

[0039] Figure 3 It is a front view schematic diagram of the steering control structure of Example 1;

[0040] Figure 4 for Figure 3A schematic cross-sectional view of AA;

[0041] Figure 5 Schematic top view of the steering control structure of Example 1;

[0042] Figure 6 for Figure 5 A schematic cross-sectional view of BB;

[0043] Figure 7 for Figure 6 An enlarged schematic diagram of the H region;

[0044] Figure 8 An exploded schematic diagram of the steering control structure of Example 1;

[0045] Figure 9 is a perspective schematic diagram of the first steering shaft of Example 1;

[0046] Figure 10 is a three-dimensional schematic diagram of the fixed plate of Example 1;

[0047] Figure 11 is a three-dimensional schematic diagram of the fixing plate of Example 1 from another angle;

[0048] Figure 12 is a three-dimensional schematic diagram of the driving disk of the first embodiment;

[0049] Figure 13 is a three-dimensional schematic diagram of the driving disk of Example 1 from another angle;

[0050] Figure 14 is a three-dimensional schematic diagram of the driven disk of the first embodiment;

[0051] Figure 15 is a three-dimensional schematic diagram of the driven disc of the first embodiment from another angle;

[0052] Figure 16 is a perspective schematic diagram of the second steering shaft of Example 1;

[0053] Figure 17 is a three-dimensional schematic diagram of the first switch device of Example 1;

[0054] Figure 18 is a three-dimensional schematic diagram of the first cover of Example 1;

[0055] Figure 19 Schematic diagram of the upper housing of the auxiliary drive gearbox of the first embodiment;

[0056] Figure 20 is a perspective schematic diagram of the upper housing of the auxiliary drive gearbox of Example 1 from another angle;

[0057] Figure 21Schematic diagram of the driving connection portion of the auxiliary driving gearbox of the first embodiment;

[0058] Figure 22 is a perspective schematic diagram of the drive connection portion of the auxiliary drive gearbox of the first embodiment from another angle;

[0059] Figure 23 is a perspective schematic diagram of the second switch device of Example 1;

[0060] Figure 24 is a three-dimensional schematic diagram of the clutch member of Example 1;

[0061] Figure 25 is a three-dimensional schematic diagram of the clutch member of Example 1 from another angle;

[0062] Figure 26 This is a schematic front view of the assembled force storage reset mechanism of Example 1;

[0063] Figure 27 for Figure 26 A schematic cross-sectional view of CC;

[0064] Figure 28 This is a three-dimensional schematic diagram of the clutch mechanism assembly of Example 1;

[0065] Figure 29 This is a top view schematic diagram of the clutch mechanism assembly of Example 1;

[0066] Figure 30 for Figure 29 A cross-sectional schematic diagram of DD;

[0067] Figure 31 The clutch member in the clutch mechanism of embodiment 1 is inserted into the second clutch channel. Figure 29 Schematic diagram of DD cross-section;

[0068] Figure 32 This is a schematic front view of the assembly of the first trigger device and the clutch mechanism of Example 1;

[0069] Figure 33 for Figure 32 A schematic diagram of a cross-section of an EE;

[0070] Figure 34 is a three-dimensional schematic diagram of the steering control structure of Example 2;

[0071] Figure 35 is a three-dimensional schematic diagram of the steering control structure of Example 2 from another angle;

[0072] Figure 36 It is a front view schematic diagram of the steering control structure of the second embodiment;

[0073] Figure 37 for Figure 36 A cross-sectional schematic diagram of FF;

[0074] Figure 38 Schematic top view of the steering control structure of Example 2;

[0075] Figure 39 for Figure 38 A schematic cross-sectional view of GG;

[0076] Figure 40 An exploded schematic diagram of the steering control structure of Example 2;

[0077] Figure 41 is a three-dimensional schematic diagram of the driving disk of the second embodiment;

[0078] Figure 42 is a three-dimensional schematic diagram of the driving disk of the second embodiment from another angle;

[0079] Figure 43 is a three-dimensional schematic diagram of a driven disk of the second embodiment;

[0080] Figure 44 is a three-dimensional schematic diagram of the driven disc of the second embodiment from another angle;

[0081] Figure 45 is a perspective schematic diagram of the second steering shaft of the second embodiment;

[0082] Figure 46 This is a three-dimensional schematic diagram of the first switch device of Example 2;

[0083] Figure 47 This is a three-dimensional schematic diagram of the first cover of Example 2;

[0084] Figure 48 A three-dimensional schematic diagram of the first cover of the second embodiment from another angle;

[0085] Figure 49 Schematic diagram of the upper housing of the auxiliary drive gearbox of the second embodiment;

[0086] Figure 50 It is a three-dimensional schematic diagram of the upper housing of the auxiliary drive gearbox of the second embodiment from another angle;

[0087] Figure 51 It is a three-dimensional schematic diagram of the torsion spring reset disk of the second embodiment;

[0088] Figure 52 This is a three-dimensional schematic diagram of the torsion spring reset disk of the second embodiment from another angle;

[0089] Figure 53 It is a three-dimensional schematic diagram of the drive connection portion of the auxiliary drive gearbox of the second embodiment;

[0090] Figure 54 A perspective schematic diagram of the drive connection portion of the auxiliary drive gearbox of the second embodiment from another angle;

[0091] Figure 55 is a perspective schematic diagram of a second switch device of Example 2;

[0092] Figure 56 This is a three-dimensional schematic diagram of the micro switch of the first switch device of Example 1;

[0093] Among them, 1-steering drive mechanism, 11-first steering shaft, 12-drive plate, 54-fixed plate, 1101-first steering shaft body, 1102-first clamping foot, 1201-drive plate seat, 1202-first shaft sleeve, 1203-first protrusion, 1204-first clamping groove, 1205-fifth rotation limiter, 1206-fourth rotation limiter; 5401-fixed plate body, 5402-first shaft hole, 5403-first angle limiter groove, 5404-claw, 5405-second mounting groove, 5406-circular convex ring, 5407-second protrusion, 5408-sixth rotation limiter; 2-steering driven mechanism, 21-second steering shaft, 22-driven plate, 23-first cover, 2101-second steering shaft body, 2102-second card foot, 2103-first fixing hole, 2104-connecting piece, 2201-driven disc, 2202-second shaft sleeve, 2203-second shaft hole, 2204-second slot, 2205-limiting protrusion, 2206-first wire groove, 2207-first mounting slot, 2208-second fixing hole, 2209-third rotation limiting part, 2301-cover, 2302-first mounting hole, 2303-third angle limiting slot, 2304-second wire groove; 3-auxiliary drive gearbox, 31-upper shell, 32-lower shell, 33-second cover, 34-drive motor, 35-drive connecting part, 36-transmission gear set, 3101-upper shell body, 3102-gearbox shaft sleeve, 3103-third shaft hole, 3104- Slot, 3105-second angle limit slot, 3106-reset disk mounting slot, 3107-second wire hole, 3108-second rotation limit portion; 3501-gear portion, 3502-connection portion, 3503-fourth axis hole, 3504-limiting slot body, 3505-first wire hole, 3506-first rotation limit portion; 4-first trigger device, 41-first switch device, 42-first trigger portion, 43-groove, 44-first switch mounting slot, 4101-trigger position, 4102-first switch mounting plate; 5-storage reset mechanism, 51-installation space, 52-torsion spring, 53- Torsion spring reset disk, 54-torsion spring fixing disk, 55-torsion spring fixing block, 56-torsion spring shift block, 5301-reset disk seat, 5302-third shaft sleeve, 5303-third clamping slot; 6-clutch mechanism, 61-clutch member, 62-first clutch channel, 63-second clutch channel, 6101-slider body, 6102-plastic member, 6103-first clamping portion, 6104-handle, 6201-second clamping portion, 6202-third clamping portion; 7-second trigger device, 71-second switch device, 72-second trigger portion, 73-second switch mounting slot, 7101-second switch, 7102-second switch mounting plate. DETAILED DESCRIPTION

[0094] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0095] Example 1

[0096] Please refer to Figures 1 to 33 As shown, this embodiment provides a steering control structure externally disposed on a steering gearbox, comprising a steering drive mechanism 1, a steering driven mechanism 2, an auxiliary drive gearbox 3, and a first trigger device 4; the steering drive mechanism 1 and the steering driven mechanism 2 are externally disposed on the auxiliary drive gearbox 3; the steering driven mechanism 2 is mounted on the power output end of the auxiliary drive gearbox 3; the first trigger device 4 comprises a first switch device 41 and a first trigger portion 42, and the first switch device 41 and the first trigger portion 42 are respectively mounted on the steering drive mechanism 1 and the steering driven mechanism 2; the steering drive mechanism 1 is configured to receive a right steering operation or a left steering operation and rotate clockwise or counterclockwise, so that the relative position of the first switch device 41 and the first trigger portion 42 changes; the first trigger device 4 is configured not to be triggered when the positions of the first switch device 41 and the first trigger portion 42 are relatively fixed, and to be triggered when the positions of the first switch device 41 and the first trigger portion 42 change relative to each other (such as Figure 33 The first trigger device 4 is also used to start the auxiliary drive gearbox 3 through the first switch device 41 when it is triggered; the auxiliary drive gearbox 3 is used to drive the steering driven mechanism 2 to rotate in the same direction as the steering drive mechanism 1 after starting, and implement the corresponding left steering function and right steering function; the first switch device 41 includes two trigger positions 4101 set at intervals (as shown in FIG. Figure 17 as shown); the two trigger positions 4101 are used to respectively control the clockwise output and counterclockwise output of the auxiliary drive gearbox 3; the first trigger part 42 corresponding to one trigger position 4101 is located on the clockwise side of the trigger position 4101, and the first trigger part 42 corresponding to the other trigger position 4101 is located on the counterclockwise side of the trigger position 4101; the first trigger part 42 and the first switch device 41 are used to trigger one of the two trigger positions 4101 by the first trigger part 42 when the relative position of the first switch device 41 and the first trigger part 42 changes; the trigger position 4101 has a first switch, and the first switch includes a micro switch or a proximity switch; the proximity switch is a photoelectric switch or a Hall switch.

[0097] Refer again Figure 17 and Figure 56 As shown, the two trigger positions 4101 are located on the same circumference, and the two first trigger portions 42 are integrated and disposed at the interval between the two trigger positions 4101 .

[0098] Refer again Figure 17 As shown, in order to further improve assembly efficiency, the first switch device 41 further includes a first switch mounting plate 4102, and the trigger position 4101 is fixed on the switch mounting plate 4102; the driven disk 22 is further provided with a first switch mounting groove 44; the first switch mounting plate 4102 is installed in the first switch mounting groove 44; the first trigger portion 42 is a boss provided on the drive disk seat 1201; the corresponding side surface of the boss in the rotation direction is close to the first switch corresponding to the trigger position 4101 (as shown in FIG. Figure 13 Specifically, the first switch of this embodiment is a photoelectric switch; the photoelectric switch includes a light emitting element and a photosensitive element; the bottom surface of the boss as the first triggering portion 42 is configured as a reflective surface, the reflective surface is configured to reflect light from the light emitting element, and the photosensitive element is configured to receive the light reflected by the reflective surface and be triggered; the boss is configured to move the reflective surface to the trigger position 4101 when the relative position of the driving disk 12 and the driven disk 22 changes due to rotation, and the photosensitive element is triggered by receiving the light reflected by the light emitting element, thereby starting the auxiliary drive gearbox; or the first switch is a photoelectric switch; the photoelectric switch includes a light emitting element and a photosensitive element; the top surfaces of the grooves 43 on both sides of the boss as the first triggering portion 42 are configured as reflective surfaces; the reflective surfaces are configured to reflect light from the light emitting element, and the photosensitive element is configured to receive the light reflected by the reflective surface; the boss is configured to block the light from the light emitting element when the relative position of the driving disk 12 and the driven disk 22 changes due to rotation, so that the photosensitive element no longer receives the reflected light and is triggered, thereby starting the auxiliary drive gearbox 3.

[0099] Refer again Figure 3-18 As shown, the auxiliary drive gearbox 3 has a gearbox shaft sleeve portion 3102 and a drive connecting portion 35 sleeved on the gearbox shaft sleeve portion 3102; the drive connecting portion 35 serves as the power output end of the auxiliary drive gearbox 3; the steering drive mechanism 1 includes a first steering shaft 11 and a drive disc 12; the steering driven mechanism 2 includes a second steering shaft 21, a driven disc 22, a first cover 23 (as shown in FIG. Figure 8 The drive disc 12 includes a drive disc seat 1201, a first sleeve 1202 fixed on the drive disc seat 1201 (as shown); Figure 12 The driven disc 22 includes a driven disc body 2201, a second sleeve 2202 provided on the driven disc body 2201, and a first mounting groove 2207 (as shown) provided in the driven disc body 2201. Figure 14 As shown); the first cover 23 includes a cover body 2301; the cover body 2301 is provided with a first mounting hole 2302 (as shown Figure 18As shown); the first steering shaft 11 and the second steering shaft 21 are coaxially distributed; the driving disc 12 is sleeved on the first steering shaft 11 through a first shaft sleeve 1202 and is circumferentially fixed to the first steering shaft 11; the driven disc 22 is sleeved on the second steering shaft 21 through a second shaft sleeve 2202 and is circumferentially fixed to the second steering shaft 21; the driving disc 12 is located in the first mounting groove 2207 of the driven disc 22, and the opening of the first mounting groove 2207 of the driven disc 22 is fixed to the first cover 23; the first cover 23 is used to axially fix the driving disc 12 and the driven disc 22. Of course, in order to ensure that the driven disc and the driving disc can rotate separately, there can be a small gap between the driving disc and the driven disc; the auxiliary drive gearbox 3 is sleeved on the first shaft sleeve 1202 through the gearbox shaft sleeve portion 3102; the auxiliary drive gearbox 3 is also sleeved on the outside of the driven disc 22 through the drive connecting portion 35 and is circumferentially fixed to the driven disc 22 (as shown Figure 4 and Figure 6 wherein the top end of the first steering shaft is used to connect to the steering wheel, and the bottom end of the second steering shaft has a bent shaft for connecting to a bogie, through which the steering of the wheels is controlled.

[0100] In a steering control structure externally mounted on a steering gearbox in this embodiment, the circumferential fixing method of the driving disc 12 and the first steering shaft 11 is as follows: a first slot 1204 (such as Figure 13 The first steering shaft 11 includes a first steering shaft body 1101 and a first card foot 1102 (as shown in the bottom side of the first steering shaft body 1101) Figure 9 The first steering shaft 11 is passed through the first sleeve 1202 from bottom to top, and the first card foot 1102 of the first steering shaft 11 is embedded in the first card groove 1204 of the drive disk 12 (as shown); Figure 4 As shown), the first steering shaft 11 and the drive disc 12 are fixed circumferentially.

[0101] In a steering control structure external to the steering gear box of this embodiment, the circumferential fixing method of the driven plate 22 and the second steering shaft 21 is as follows: Figure 15 and Figure 16As shown, a second groove 2204 is provided on the bottom side of the second sleeve 2202 of the driven disc 22, and a radial second fixing hole 2208 is provided at the side wall of the second sleeve 2202; the second steering shaft 21 includes a second steering shaft body 2101 and a second clamping foot 2102 located near the top of the second steering shaft body 2101, and the second steering shaft body 2101 is provided with a first fixing hole 2103 at a position above the second clamping foot 2102; the top of the second steering shaft body 21 is passed through the second shaft hole 2203 of the second sleeve 2202, and the second clamping foot 2102 is clamped in the second groove 2204, so that the driven disc 22 and the second steering shaft 21 are circumferentially fixed; the first fixing hole 2103 corresponds to the second fixing hole 2208 and is connected by a connecting member 2104, so that the driven disc 22 and the second steering shaft 21 are axially fixed (as shown in FIG. Figure 4 As shown in the figure, since the second steering shaft 21 is the component that directly acts on the bogie to steer the wheels, the second steering shaft is subjected to a larger torque. Therefore, the thickness of the bottom side portion of the second sleeve 2202 of the driven plate 22 needs to be increased, and the strength of the connection is further improved by designing the second clip 2102 and the second slot 2204.

[0102] In this embodiment, a steering control structure external to the steering gear box is provided. Figure 6 As shown, the auxiliary steering gearbox 3 includes an upper housing 31, a lower housing 32, a drive motor 34, a drive connecting portion 35 and a transmission gear set 36; Figure 19 As shown, the upper shell 31 includes an upper shell body 3101, a mounting seat for the drive motor is provided at the top side of the upper shell body 3101 near the left end, and the gear box shaft sleeve portion 3102 is provided at the top side near the right end; the lower shell 32 is provided with an opening at a position corresponding to the gear box shaft sleeve portion 3102; Figure 21 and Figure 22 As shown, the drive connecting part 35 includes a gear part 3501, a connecting part 3502 located on the bottom side of the gear part 3501, and a fourth axial hole 3503 located at the center of the gear part 3501; the upper shell 31 and the lower shell 32 are fixedly installed, and a mounting cavity is formed on the inner side; the drive motor 34 is installed in the mounting seat, and its driving end extends into the mounting cavity; the gear part 3501 of the drive connecting part 35 is located in the mounting cavity, and is sleeved on the gear box sleeve part 3102 through the fourth axial hole 3503; the bottom surface of the gear part 3501 is limited by the lower opening of the lower shell 32, and the connecting part 3502 on the bottom side of the gear part 3501 extends from the opening; a transmission gear set is also installed in the mounting cavity for transmission connection between the driving end of the drive motor and the gear part 3501 of the drive connecting part 35.

[0103] In a steering control structure externally mounted on a steering gearbox in this embodiment, the driving connection portion 35 and the driven disc 22 are fixed circumferentially in the following manner: the outer side wall of the driven disc 22 is further provided with a limiting protrusion 2205 (such as Figure 14 As shown), the inner side wall of the connecting portion 3502 of the driving connecting portion 35 is provided with a limiting groove 3504 corresponding to the limiting protrusion 2205 (as shown Figure 21 The limiting groove 3504 cooperates with the limiting convex body 2205 to fix the driving connection portion 35 and the driven disk 22 circumferentially (as shown); Figure 2 shown).

[0104] Refer again Figure 14-15 、 Figure 18-22 As shown, the first switch mounting groove 44 is provided on the bottom surface of the driven disk 22; the lead wire of the first switch needs to be led out, and in order to protect the line, a first wire groove 2206 is provided on the side of the driven disk at a position close to the first switch mounting groove 44; a second wire groove 2304 is provided on the side of the first cover 23 at a position corresponding to the first wire groove 2206; a first wire hole 3505 is also provided on the drive connecting portion 35; the upper shell 31 of the drive gear box 3 A second wire passing hole 3107 is provided at a position corresponding to the first wire passing hole 3505; the corresponding lead of the first switch passes through the first wire passing groove 2206, the second wire passing groove 2304, the first wire passing hole 3505, and the second wire passing hole 3107 in sequence and then is led out; since the position of the second wire passing hole 3107 of the upper shell is fixed, and the first wire passing hole 3505 rotates with the drive connecting part 35, in order to prevent the drive connecting part 35 from excessively rotating and cutting the line, a first rotation limit part 3506 is also provided on the top side of the drive connecting part 35, and a second rotation limit part 3108 is respectively provided on the bottom side of the upper shell 31 in the clockwise and counterclockwise directions of the first rotation limit part 3506. The two second rotation limit parts 3108 cooperate with the first rotation limit part 3506 to limit the clockwise and counterclockwise rotation angles of the drive connecting part 35. When the first rotation limiting portion 3506 reaches the second rotation limiting portion 3018 , the first wire passing hole 3505 and the second wire passing hole 3107 remain in a communicating state.

[0105] Refer again Figure 4 As shown, the steering control structure also includes a force storage reset mechanism 5; the force storage reset mechanism 5 acts on the steering drive mechanism 1, and is used to store force when the steering drive mechanism 1 receives a right steering operation or a left steering operation and rotates, and is also used to drive the steering drive mechanism 1 to rotate in the opposite direction and return to the initial position when the steering drive mechanism 1 loses the force of the left steering operation or the left steering operation.

[0106] Refer again Figure 7As shown, the force storage reset mechanism 5 includes an installation space 51, a torsion spring 52 located in the installation space 51, a torsion spring fixing block 55, and a torsion spring shift block 56; the two torsion arms of the torsion spring 52 are respectively arranged on both sides of the torsion spring fixing block 55 after crossing; the torsion spring shift block 56 is arranged between the two torsion arms of the torsion spring; the torsion spring fixing block 55 does not rotate with the driving disk; the torsion spring shift block rotates with the driving disk; the torsion spring 52 is used to store force due to the change in the distance between the two torsion arms under the joint action of one torsion arm being driven by the torsion spring shift block and the other torsion arm being limited by the torsion spring fixing block 55 when the torsion spring shift block rotates with the driving disk.

[0107] In this embodiment, a steering control structure external to the steering gear box is provided. Figure 10 and Figure 11 As shown, the force storage reset mechanism 5 also includes a fixed disk 54; the fixed disk 54 includes a fixed disk body 5401 and a first axial hole 5402 provided on the fixed disk body 5401; the fixed disk 54 is sleeved on the first shaft sleeve 1202 through the first axial hole 5402; the fixed disk 54 is also located in the first mounting groove 2207 of the driven disk 22; the first cover 23 is also used to axially fix the driving disk 12 and the fixed disk 54 to the driven disk 22, and the fixed disk 54 is also circumferentially fixed to the gear box shaft sleeve portion 3102; the fixed disk 54 is also circumferentially fixed to the gear box shaft sleeve portion 3102 in the following manner: the fixed disk body 5401 is further provided with a claw 5404; the gear box shaft sleeve portion 3102 is further provided with a slot 3104 (as shown) at a position corresponding to the claw 5404. Figure 20 The claw 5404 engages with the slot 3104 to circumferentially secure the fixed plate 54 to the gearbox shaft sleeve 3102. This plug-in connection allows the first cover 23, drive plate 12, fixed plate 54, first steering shaft 11, driven plate 22, and second steering shaft 21 to be assembled into a single structure. The fixed plate 54 can then be quickly assembled and disassembled from the auxiliary drive gearbox, making it extremely convenient. The slot 3104 is also located on the inner wall of the third shaft hole 3103 of the gearbox shaft sleeve 3102. The thickness of the slot 3104 matches that of the second angle limiting groove 3105. To further enhance the stability of the connection structure, two slots 3104 and two first limiting grooves 3103 are provided, alternating between the slots 3104 and the first limiting grooves 3103, forming a cross-like arrangement.

[0108] Please refer to Figure 7 、 Figure 27As shown, the installation space 51 of the reset force storage structure is arranged between the driving disk 12 and the fixed disk 54; a second installation groove 5405 is provided in the fixed disk body 5401; the second installation groove 5405 and the driving disk seat 1201 constitute the installation space 51; the torsion spring fixing block 55 is arranged on the inner wall of the second installation groove 5405, and the torsion spring shift block 56 is arranged on the driving disk seat 1201; the torsion spring is sleeved on the first shaft sleeve 1202. With this design, no matter whether the driving disc 12 rotates clockwise or counterclockwise, one of the torsion arms of the torsion spring will be limited and fixed by the torsion spring fixing block 55, while the other torsion arm will be driven by the torsion spring shift block 56 to rotate with the driving disc 12, so that the torsion spring can be deformed and force can be stored; after the steering wheel is released, the driving disc 12 is no longer subjected to external operating force, and the stored force of the torsion spring is released, which will drive the torsion spring shift block 56 to move in the opposite direction until the two torsion arms of the torsion spring are limited between the torsion spring fixing block 55 and are relatively fixed; at this time, the driving disc 12 is also driven by the torsion spring shift block 56 to return to the forward state; in conjunction with this process, since the driving disc 12 is driven to rotate by the torsion spring shift block 56, the first trigger device will be triggered, controlling the auxiliary steering gearbox to drive the driven disc 22 to rotate and return to the center, thereby controlling the bending axis return of the second steering shaft 21, so that the wheel returns to the forward direction.

[0109] In a steering control structure external to the steering gearbox of this embodiment, the steering control structure further includes a second trigger device 7; the second trigger device 7 includes a second switch device 71 and a second trigger part 72; one of the second switch device 71 and the second trigger part 72 is fixedly installed without rotating with the drive disc, and the other is installed to rotate with the drive disc; the second switch device 71 and the second trigger part 72 are used to correspond in position when the drive disc is forward, and not correspond in position when the drive disc is steering; the second trigger device 7 is used to switch the low speed of the auxiliary drive gearbox 3 through the position correspondence and position non-correspondence of the second switch device 71 and the second trigger part 72 state and high-speed state; specifically, the second trigger portion 72 is a convex block. In order to improve assembly efficiency, the second switch device 71 also includes a second switch mounting plate 7102; the second switch 7101 is fixed on the second switch mounting plate 7102; the second switch device 71 is fixed by the second switch mounting slot 73; the second switch 7101 is a micro switch; wherein the second trigger portion 72 is arranged on the top surface of the torsion spring shift block 56 of the driving disk 12; the second mounting slot 73 is arranged on the fixed disk 54; the contact of the second switch 7101 of the second switch device 71 passes downward through the fixed disk 54 and then matches with the convex block of the second trigger portion (such as Figure 10 、 Figure 12 and Figure 17 shown).

[0110] In a steering control structure external to the steering gearbox of this embodiment, a corresponding rotation angle limiting mechanism is further provided to ensure smooth operation of the corresponding structure. The rotation angle limiting mechanism is a combination of one or more of a variety of rotation angle limiting mechanisms. The various rotation angle limiting mechanisms include:

[0111] First rotation angle limiting mechanism: The angle limiting mechanism between the drive disc 12 and the gearbox sleeve 3102 is as follows: the gearbox sleeve 3102 has a third shaft hole 3103, and the inner wall of the third shaft hole 3103 is also provided with a second angle limiting groove 3105; the outer wall of the first sleeve 1202 is also provided with a first protrusion 1203; the first protrusion 1203 is used to rotate within the range of the second angle limiting groove 3105 as the drive disc 12 rotates. In other words, the rotation angle of the first steering shaft is limited, and ultimately the rotation angle of the steering wheel and the steering bracket is limited (such as Figure 12 and Figure 20 shown);

[0112] Second rotation angle limiting mechanism: The angle limiting mechanism of the driving disk 12 and the fixed disk 54 is as follows: a first angle limiting groove 5403 is further provided on the inner wall of the first shaft hole 5402 of the fixed disk 54; a first protrusion 1203 is further provided on the outer wall of the first shaft sleeve 1202; the first protrusion 1203 is used to rotate within the range of the first angle limiting groove 5403 as the driving disk 12 rotates (such as Figure 10-12 shown);

[0113] The third rotation angle limiting mechanism: The angle limiting mechanism between the first cover 22 and the fixed plate 54 is as follows: a third angle limiting groove 3103 is further provided on the inner wall of the first mounting hole 2302 of the first cover 23; a circular protruding ring 5406 is further provided on the fixed plate 54; a second protruding portion 5407 is further provided on the side wall of the circular protruding ring 5406; the first cover 23 is fitted onto the circular protruding ring 5406 through the first mounting hole 2302, and the second protruding portion 5407 cooperates with the third angle limiting groove 3103. When the driven plate 22 rotates, the third angle limiting groove 3103 rotates along with the first cover 23, and the second protruding portion 5407 limits the rotation angle of the third angle limiting groove 3103 (such as Figure 10 、 Figure 11 and Figure 18 shown);

[0114] Fourth rotation angle limiting mechanism: The limiting structure between the driving disk 12 and the driven disk 22 is as follows: a third rotation limiting portion 2209 is provided on the bottom surface of the first mounting groove 2207 of the driven disk 22; a fourth rotation limiting portion 1206 is provided on the bottom surface of the driving disk 12; the third rotation limiting portion 2209 cooperates with the fourth rotation limiting portion 1206 to limit the relative rotation angle of the driving disk and the driven disk; specifically, the third rotation limiting portion 2209 is a fan-shaped boss provided along the circumferential direction of the first mounting groove 2207; the fourth rotation limiting portion 1206 is a fan-shaped boss provided along the circumferential direction of the bottom side of the driving disk 12 (such as Figure 13 and Figure 14 shown);

[0115] Fifth rotation angle limiting mechanism: The driving disk 12 is further provided with a fifth rotation limiting portion 1205 at a position corresponding to the torsion spring fixing block 55 on the fixed disk 54; the fifth rotation limiting portion 1205 cooperates with both sides of the torsion spring fixing block 55 to limit the rotation angle of the driving disk 12 relative to the fixed disk 54; specifically, the fifth rotation limiting portion 1205 is a fan-shaped groove (such as Figure 11 and Figure 12 shown);

[0116] Sixth rotation angle limiting mechanism: A third rotation limiting portion 2209 is provided on the bottom surface of the first mounting groove 2207 of the driven disk 22; a sixth rotation limiting portion 5408 is provided on the bottom edge of the fixed disk body 5401 of the fixed disk 54; the sixth rotation limiting portion 5408 cooperates with the third rotation limiting portion 2209 to limit the rotation angle of the driven disk 22 relative to the fixed disk 54; specifically, the sixth rotation limiting portion 5408 is a fan-shaped groove provided along the outer circumference of the bottom side of the fixed disk; when used in conjunction with the fourth rotation angle limiting mechanism, the limiting range of the sixth rotation limiting portion 5408 is consistent with that of the fourth rotation limiting portion 1206 (as shown in Figures 11 and Figure 14 shown).

[0117] The above-mentioned various methods of limiting the rotation angle can be used independently or together as in the present embodiment. Such a design, with multiple limit combinations, forms a "nesting doll-style" installation, which prevents workers from making mistakes during assembly, improves work efficiency, and has an anti-"reverse" design effect.

[0118] In a steering control structure externally disposed in a steering gearbox according to this embodiment, the steering control structure further includes a clutch mechanism 6; the clutch mechanism 6 includes a clutch member 61, a first clutch channel 62 provided on the driven disc 22, and a second clutch channel 63 provided on the driving disc 12; the clutch member 61 is used to pass through the first clutch channel 62 and be inserted into the second clutch channel 63, so that the driving disc 12 and the driven disc 22 are fixed in the circumferential direction, or to remain in the first clutch channel 62 and not enter the second clutch channel 63, so that the driving disc 12 and the driven disc 22 have the freedom of circumferential relative movement; specifically, as Figure 24 and Figure 25 As shown, the clutch member 61 is a slider; the first clutch channel 62 is a slideway that cooperates with the slider; the second clutch channel 63 is a slide groove that cooperates with the slider; the slider includes a slider body 6101, and the slider body 6101 is further provided with an elastic member 6102; the elastic member 6102 is further provided with a first locking portion 6103 on the matching surface with the first clutch channel 62; the second clutch channel 62 is further provided with a second locking portion 6201 and a third locking portion 6202 on the matching surface with the elastic member 6102; the second locking portion 6201 is used to clamp the first locking portion 6103 when the clutch member 61 extends into the second clutch channel 63, so that the clutch member 61 maintains the state of extending into the second clutch channel 63. In this state, the clutch member 61 drives the drive disk 12 The third latching portion 6202 is used to clamp the first latching portion 6103 when the clutch member 61 does not extend into the second clutch channel 63, so that the clutch member 61 remains in the first clutch channel 62, neither entering the second clutch channel 63 nor sliding out of the first clutch channel 62. In this state, the driving disk 12 and the driven disk 22 are separated. In addition, in order to facilitate the push-pull operation of the clutch member 61, a handle 6104 is further provided on the bottom side of the slider body 6101; it should also be noted that the elastic member 6102 can realize the corresponding elastic function through the structure; specifically, the top end of the elastic member 6102 is connected to the top end of the slider body 6101, and a space for the elastic member 6102 to bend toward the slider body 6101 is provided between the elastic member 6102 and the slider body 6101. Through the bending of the elastic member 6102 toward the slider body 6101, the first locking portion 6103 on the elastic member 6102 has the elastic freedom to pass through the second locking portion 6201 or the third locking portion 6202, thereby enabling push-pull or removal operations (such as Figure 30 and Figure 31 shown).

[0119] The working process of a steering control structure external to the steering gearbox of this embodiment is as follows:

[0120] Steering process (taking right turn as an example): When the operator controls the steering wheel to turn right (i.e., when performing a right turn operation), the first steering shaft 11 rotates synchronously with the steering wheel, and the first steering shaft 11 will drive the driving disc 12 to rotate synchronously, and the driving disc 12 drives the torsion spring shift block 56 to rotate clockwise, causing the torsion spring 52 to deform and store force. At the same time, the driven disc 22 is only axially fixed to the driving disc 12, and has the freedom of relative rotation in the circumferential direction, which will cause the driven disc 22 and the driving disc 12 to change position in the circumferential direction. The boss of the first trigger part 42 will trigger its first switch in the clockwise direction, starting the right turn auxiliary function of the auxiliary drive gearbox, and the auxiliary drive gearbox 3 will output corresponding power through the drive connecting part 35, and the drive connecting part 35 will rotate clockwise around the gearbox shaft sleeve part 3102, thereby driving the driven disc 22 The second steering shaft 21 also stops rotating, and the bogie drives the steering wheel to keep the deflection state; the vehicle continues to turn right; in this process, at the initial position, due to the second switch 7101 of the second trigger device 7, the second switch 7101 of the second trigger device 7 stops rotating. Corresponding to the protrusion of the second triggering part 72, when the driving disk 12 rotates clockwise, the protrusion of the second triggering part 72 rotates accordingly, and the second switch 7101 switches the driving motor of the auxiliary driving gearbox 3 from a low speed state to a high speed state, so that the corresponding steering function responds quickly;

[0121] Steering release return process: When the operator releases the steering wheel, the stored force of the torsion spring 52 is released, causing the driving disc 12 to rotate counterclockwise until it returns to the forward direction (initial position). At this time, as the driving disc 12 rotates, the driving disc 12 and the driven disc 22 change positions in the circumferential direction again, and the boss of the first triggering portion 42 triggers its first switch in the counterclockwise direction, starting the left turn auxiliary function of the auxiliary drive gearbox. The auxiliary drive gearbox 3 drives the driven disc 22 to rotate counterclockwise, and the driven disc 22 drives the second steering shaft 21 to rotate counterclockwise. The rotation of the second steering shaft 21 will cause the curved shaft at its bottom end to return to the left, thereby causing the bogie connected to the curved shaft of the second steering shaft 21 to drive the steering wheel to return to the center; in this process, since the rotation of the driven disc 22 lags slightly behind the driving disc 12, when the driving disc 12 returns to the center, the protrusion of the second trigger part 72 again corresponds to the second switch 7101 of the second trigger device 7. At this time, the second switch 7101 will switch the drive motor of the auxiliary drive gearbox 3 from a high-speed state to a low-speed state, so that the steering speed of the return process changes from fast to slow, thereby ensuring the stability of the vehicle body.

[0122] Example 2

[0123] Please refer to Figures 34 to 55 As shown, this embodiment provides another steering control structure external to the steering gear box. The difference from the first embodiment is that in this embodiment, the first switch mounting groove 44 is provided on the first cover 23 (as shown in FIG. Figure 47 The two trigger positions 4101 are located on different circumferences (as shown); Figure 46 As shown), each first trigger portion 42 is located on the same circumference of the corresponding trigger position 4101 (as shown Figure 41 As shown); the first switch of this embodiment is a micro switch; the boss of the first trigger portion 42 is used to touch and press down the contact on the micro switch when the relative position of the driving disk 12 and the driven disk 22 changes due to rotation, so that the micro switch is closed and the auxiliary drive gear box is started; when the boss of one first trigger portion 42 contacts one of the micro switches, the groove on the side of the boss of the other first trigger portion 42 corresponds to the other micro switch and does not contact the micro switch.

[0124] The steering control structure of this embodiment, which is externally mounted on the steering gear box, is different from the first embodiment in that: as shown in FIG37, Figure 39 As shown, the installation space 51 of the power storage reset mechanism 5 is set at the top of the gear box sleeve portion 3102; the fixing plate 54 of the embodiment 1 is designed as an integral structure with the upper shell 31 of the auxiliary steering gear box; Figures 49-52As shown: the force storage reset mechanism 5 also includes a torsion spring reset disk 53; the upper shell 31 is provided with a reset disk mounting groove 3106 at the top of the gear box sleeve portion 3102, and the top surface of the reset disk mounting groove 3106 is also provided with a second cover 33; the second cover 33 and the reset disk mounting groove 3106 form the installation space 51; the torsion spring reset disk 53 includes a reset disk seat 5301 and a third shaft sleeve 5302 fixed on the reset disk seat 5301; the torsion spring reset disk 53 is sleeved by the third shaft sleeve 5302 The torsion spring reset disk 53 is circumferentially fixed to the first sleeve 1202 of the drive disk 12. The torsion spring reset disk 53 is also mounted in the reset disk mounting groove 3106 via the reset disk seat 5301. The torsion spring fixing block 55 is disposed on the inner wall of the reset disk mounting groove 3106. The torsion spring shift block 56 is disposed on the reset disk seat 5301. The torsion spring 52 is sleeved on the third sleeve 5302. The second cover 33 axially limits the torsion spring reset disk 53 and the reset disk mounting groove 3106 by axially limiting the torsion spring shift block 56. This design is essentially the same as the principle of the force storage reset mechanism 5 of Example 1 and will not be further described here.

[0125] In a steering control structure externally mounted on a steering gearbox in this embodiment, the circumferential fixing method of the torsion spring reset plate 53 and the first shaft sleeve 1202 is as follows: Figure 51 and Figure 2 As shown, a third retaining groove 5303 is further defined on the inner wall of the third sleeve 5302 of the torsion spring reset disk 53. When the third sleeve 5302 is mounted on the outside of the first sleeve 1202, the first protrusion 1203 of the first sleeve 1202 is embedded in the third retaining groove 5303, thereby circumferentially fixing the torsion spring reset disk 53 to the first sleeve 1202. The working principle of this installation method is generally consistent with that of the embodiment and will not be further described here.

[0126] The steering control structure of this embodiment, which is external to the steering gear box, is different from the first embodiment in that the second trigger device is designed as follows: Figure 51 and Figure 52 As shown, the second trigger portion 72 is a convex block, the second switch device 71 includes a second switch mounting plate 7102, and a second switch 7101 fixed on the second switch mounting plate 7102; the second switch device 71 is fixed by a second switch mounting groove 73; the second switch 7101 is a micro switch; wherein the second trigger portion 72 is arranged on the outer side of the torsion spring shift block 56 of the torsion spring reset disk 53; the second mounting groove 73 is arranged on the torsion spring fixing block 55 of the reset disk mounting groove 3106 (as shown in FIG. Figure 49The contact of the second switch 7101 of the second switch device 71 passes inward through the torsion spring fixing block 55 and then engages with the protrusion of the second trigger portion 72. This design is similar to the working principle of the second trigger device in Example 1 and will not be repeated here.

[0127] The steering control structure of this embodiment, which is externally mounted on the steering gear box, is different from the first embodiment in that the clutch mechanism is designed as follows: Figure 39 As shown, the clutch member 61 is a screw; the first clutch channel 62 is a screw hole that cooperates with the screw; the second clutch channel 63 is a hole groove that cooperates with the screw; by screwing the screw in and out, the state of entering the second clutch channel 63 and the state of leaving the second clutch channel 63 are switched.

[0128] The working principle of the steering control structure externally mounted on the steering gearbox in this embodiment is substantially consistent with that of the first embodiment, and will not be described in detail here.

[0129] In the above two embodiments, the first trigger device, rotation angle limiting mechanism, force storage reset mechanism, second trigger device, and clutch mechanism all have at least two specific implementation methods. The above mechanisms can be combined through reasonable settings, and do not need to be combined according to the combination mechanisms determined in Example 1 and Example 2, as long as the corresponding functions can be achieved.

[0130] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion fall within the protection scope of the present invention.

Claims

1. A steering control structure externally mounted on a steering gearbox, characterized in that: The invention comprises a steering drive mechanism, a steering driven mechanism, an auxiliary drive gearbox, and a first trigger device; the steering drive mechanism and the steering driven mechanism are externally arranged on the auxiliary drive gearbox; the steering driven mechanism is installed at the power output end of the auxiliary drive gearbox; the first trigger device comprises a first switch device and a first trigger part, and the first switch device and the first trigger part are respectively installed on the steering drive mechanism and the steering driven mechanism; the steering drive mechanism is used to receive a right steering operation or a left steering operation and rotate clockwise or counterclockwise, so that the relative position of the first switch device and the first trigger part changes; the first trigger device is used to not be triggered when the positions of the first switch device and the first trigger part are relatively fixed, and to be triggered when the positions of the first switch device and the first trigger part change relative to each other; the first trigger device is also used to start the auxiliary drive gearbox through the first switch device when triggered; the auxiliary drive gearbox is used to drive the steering driven mechanism and the steering drive mechanism to rotate in the same direction after being started, so as to implement the corresponding left steering function and right steering function; The steering drive mechanism includes a driving disc; the steering driven mechanism includes a driven disc; The steering control structure further includes a second trigger device; the second trigger device includes a second switch device and a second trigger portion; one of the second switch device and the second trigger portion is fixedly mounted and does not rotate with the drive disc, while the other is mounted to rotate with the drive disc; the second switch device and the second trigger portion are configured to correspond in position when the drive disc is in the forward direction and to not correspond in position when the drive disc is in the reverse direction; the second trigger device is configured to switch the auxiliary drive gearbox between a low speed state and a high speed state by virtue of the correspondence and non-correspondence between the positions of the second switch device and the second trigger portion; The steering control structure also includes a clutch mechanism; the clutch mechanism includes a clutch member, a first clutch channel arranged on the driven disc, and a second clutch channel arranged on the driving disc; the clutch member is used to pass through the first clutch channel and be inserted into the second clutch channel to fix the driving disc and the driven disc circumferentially, or to remain in the first clutch channel and not enter the second clutch channel, so that the driving disc and the driven disc have the freedom of circumferential relative movement.

2. The steering control structure externally mounted on a steering gearbox according to claim 1, characterized in that: The first switch device includes two trigger positions spaced apart from each other; the two trigger positions are used to control the clockwise and counterclockwise power output of the auxiliary drive gearbox, respectively; the first trigger portion corresponding to one trigger position is located on the clockwise side of the trigger position, and the first trigger portion corresponding to the other trigger position is located on the counterclockwise side of the trigger position; the first trigger portion and the first switch device are configured such that when the relative position of the first switch device and the first trigger portion changes, one of the two trigger positions is triggered by the first trigger portion; The trigger position has a first switch, which includes a micro switch or a proximity switch; the proximity switch is a photoelectric switch or a Hall switch; The two trigger positions are located on the same circumference, and the two first trigger portions are integrated and arranged at the interval between the two trigger positions; Alternatively, the two trigger positions are located on different circumferences, and each first trigger portion is located on the same circumference as the corresponding trigger position.

3. The steering control structure externally mounted on a steering gearbox according to claim 2, characterized in that: The auxiliary drive gearbox comprises a gearbox shaft sleeve portion and a drive connecting portion sleeved on the gearbox shaft sleeve portion; the drive connecting portion serves as the power output end of the auxiliary drive gearbox; the steering drive mechanism also comprises a first steering shaft; the steering driven mechanism also comprises a second steering shaft and a first cover; the driving disc comprises a driving disc seat and a first shaft sleeve fixed on the driving disc seat; the driven disc comprises a driven disc body and a second shaft sleeve arranged on the driven disc body, and a first mounting groove is provided in the driven disc body; the first cover comprises a cover body; the cover body is provided with a first mounting hole; the first steering shaft and The second steering shaft is coaxially distributed; the driving disc is sleeved on the first steering shaft through a first sleeve and is circumferentially fixed to the first steering shaft; the driven disc is sleeved on the second steering shaft through a second sleeve and is circumferentially fixed to the second steering shaft; the driving disc is located in the first mounting groove of the driven disc, and the opening of the first mounting groove of the driven disc is fixed to the first cover; the first cover is used to axially fix the driving disc and the driven disc, and the auxiliary driving gear box is sleeved on the first sleeve through the gear box sleeve portion; the auxiliary driving gear box is also sleeved on the outside of the driven disc through a driving connecting portion and is circumferentially fixed to the driven disc.

4. The steering control structure externally mounted on a steering gearbox according to claim 3, characterized in that: The driving disc and the first steering shaft are circumferentially fixed in the following manner: a first groove is provided on the bottom side of the first sleeve of the driving disc; the first steering shaft includes a first steering shaft body and a first clip located on the bottom side of the first steering shaft body; the first steering shaft is inserted into the first sleeve from bottom to top, and the first clip of the first steering shaft is embedded in the first groove of the driving disc, so that the first steering shaft and the driving disc are circumferentially fixed; the driven disc and the second steering shaft are circumferentially fixed in the following manner: a second groove is provided on the bottom side of the second sleeve of the driven disc, and a radial second fixing hole is provided at the side wall of the second sleeve; the second steering shaft includes a second steering shaft body and a second clip located near the top end of the second steering shaft body, and the second steering shaft body is provided with a first fixing hole at a position above the second clip; the top end of the second steering shaft body is inserted into the second axial hole of the second sleeve, and the second clip is inserted into the second groove, so that the driven disc and the second steering shaft are circumferentially fixed; the first fixing hole corresponds to the second fixing hole and is connected by a connecting member, so that the driven disc and the second steering shaft are axially fixed.

5. A steering control structure externally mounted on a steering gearbox according to claim 3 or 4, characterized in that: The first switch device further includes a first switch mounting plate, the trigger position is fixed on the switch mounting plate; the driven disk is further provided with a first switch mounting slot; the first switch mounting plate is mounted in the first switch mounting slot; The first trigger portion is a boss provided on the driving disc seat; the boss is located adjacent to the first switch at the corresponding trigger position on the corresponding side in the rotation direction; the first switch mounting groove is provided on the bottom surface of the driven disc; or the first switch mounting groove is provided on the first cover; The first switch is a photoelectric switch comprising a light emitting element and a light sensing element. The bottom surface of the boss, which serves as the first triggering portion, is configured as a reflective surface. The reflective surface is configured to reflect light from the light emitting element, and the light sensing element is configured to be triggered by receiving the light reflected by the reflective surface. When the relative positions of the driving disc and the driven disc change due to rotation, the reflective surface of the boss moves to a triggering position, and the light sensing element is triggered by receiving the light reflected by the light emitting element, thereby starting the auxiliary drive gearbox. Alternatively, the first switch is a photoelectric switch; the photoelectric switch includes a light emitting element and a light sensing element; the top surfaces of the grooves on both sides of the boss serving as the first triggering portion are configured as reflective surfaces; the reflective surfaces are configured to reflect light from the light emitting element, and the light sensing element is configured to receive light reflected by the reflective surfaces; the boss is configured to shield the light from the light emitting element when the relative positions of the driving disc and the driven disc change due to rotation, so that the light sensing element no longer receives the reflected light and is triggered, thereby starting the auxiliary drive gearbox; Alternatively, the first switch is a micro switch; the boss of the first trigger portion is used to touch and press down the contacts on the micro switch when the relative positions of the driving disk and the driven disk change due to rotation, so that the micro switch is closed and the auxiliary drive gearbox is started.

6. The steering control structure externally mounted on a steering gearbox according to claim 5, characterized in that: A first wire passing groove is provided on the side of the driven disk at a position close to the first switch mounting groove; a second wire passing groove is provided on the side of the first cover at a position corresponding to the first wire passing groove; a first wire passing hole is also provided on the drive connecting part; a second wire passing hole is provided on the drive gear box at a position corresponding to the first wire passing hole; the corresponding lead wires of the first switch pass through the first wire passing groove, the second wire passing groove, the first wire passing hole and the second wire passing hole in sequence and then are led out; a first rotation limiting part is also provided on the top side of the drive connecting part, and the drive gear box is respectively provided with second rotation limiting parts in the clockwise and counterclockwise directions of the first rotation limiting part, and the two second rotation limiting parts cooperate with the first rotation limiting part to limit the clockwise and counterclockwise rotation angles of the drive connecting part; when the first rotation limiting part is between the two second rotation limiting parts, the first wire passing hole and the second wire passing hole remain in a connected state.

7. A steering control structure externally mounted on a steering gearbox according to claim 3 or 4, characterized in that: The steering control structure further includes a force storage reset mechanism; the force storage reset mechanism acts on the steering drive mechanism, and is used to store force when the steering drive mechanism receives a right steering operation or a left steering operation and rotates, and is also used to drive the steering drive mechanism to rotate in the opposite direction and return to the initial position when the steering drive mechanism loses the force of the right steering operation or the left steering operation; The force storage reset mechanism includes an installation space, a torsion spring located in the installation space, a torsion spring fixing block, and a torsion spring shifting block; the two torsion arms of the torsion spring are respectively arranged on both sides of the torsion spring fixing block after crossing; the torsion spring shifting block is arranged between the two torsion arms of the torsion spring; the torsion spring fixing block does not rotate with the driving disk; the torsion spring shifting block rotates with the driving disk; the torsion spring is used to store force due to the change in the distance between the two torsion arms under the combined action of one torsion arm being driven by the torsion spring shifting block and the other torsion arm being limited by the torsion spring fixing block when the torsion spring shifting block rotates with the driving disk; and a gear engaged with the first gear and the gear engaged with the first gear and the gear engaged with the first gear and the gear engaged with the first gear. Alternatively, the installation space is arranged at the top end of the gear box sleeve portion; the force storage reset mechanism also includes a torsion spring reset disk; the driving gear box is provided with a reset disk mounting groove at the top end of the gear box sleeve portion, and the top surface of the reset disk mounting groove is also provided with a second cover; the installation space is formed between the second cover and the reset disk mounting groove; the torsion spring reset disk includes a reset disk seat and a third sleeve fixed on the reset disk seat; the torsion spring reset disk is sleeved on the first sleeve of the driving disk through the third sleeve and is circumferentially fixed to the first sleeve; the torsion spring reset disk is also installed in the reset disk mounting groove through the reset disk seat; the torsion spring fixing block is arranged at the inner wall of the reset disk mounting groove; the torsion spring shift block is arranged on the reset disk seat; the torsion spring sleeve is arranged on the third sleeve.

8. The steering control structure externally mounted on a steering gearbox according to claim 7, characterized in that: The second trigger portion is a bump, and the second switch device further includes a second switch mounting plate; the second switch is fixed to the second switch mounting plate; the second switch device is fixed by a second switch mounting slot; the second switch is a micro switch or a proximity switch; the proximity switch is a photoelectric switch or a Hall switch; When the installation space is provided between the driving disk and the fixed disk, the second trigger portion is provided on the top surface of the torsion spring block of the driving disk; the second installation slot is provided on the fixed disk; and the contact of the second switch of the second switch device passes downward through the fixed disk and engages with the protrusion of the second trigger portion. Alternatively, when the second switch device is located at the top end of the gear box shaft sleeve portion, the second trigger portion is arranged on the outer side surface of the torsion spring reset disk; the second mounting groove is arranged on the inner side surface of the gear box bottom shell reset disk mounting groove; the contact of the second switch of the second switch device is inwardly matched with the protrusion of the second trigger portion.

9. The steering control structure externally mounted on a steering gearbox according to claim 7, characterized in that: The steering control structure is further provided with a corresponding rotation angle limiting mechanism, which is a combination of one or more of a variety of rotation angle limiting mechanisms; the various rotation angle limiting mechanisms include: First rotation angle limiting mechanism: The angle limiting mechanism between the drive plate and the gearbox sleeve is as follows: the gearbox sleeve has a third axial hole, the inner wall of which is further provided with a second angle limiting groove; the outer wall of the first sleeve is further provided with a first protrusion; the first protrusion is configured to rotate within the range of the second angle limiting groove as the drive plate rotates; Second rotation angle limiting mechanism: The angle limiting mechanism between the driving plate and the fixed plate comprises: a first angle limiting groove is further provided on the inner wall of the first shaft hole of the fixed plate; a first protrusion is further provided on the outer wall of the first sleeve; the first protrusion is configured to rotate within the range of the first angle limiting groove as the driving plate rotates; Third rotation angle limiting mechanism: The angle limiting mechanism of the first cover and the fixed plate is as follows: a third angle limiting groove is further provided on the inner wall of the first mounting hole of the first cover; a circular convex ring is further provided on the fixed plate; a second protrusion is further provided on the side wall of the circular convex ring; the first cover is sleeved on the circular convex ring through the first mounting hole, and the second protrusion cooperates with the third angle limiting groove, so that when the driven plate rotates, the third angle limiting groove rotates together with the first cover, and the rotation angle of the third angle limiting groove is limited by the second protrusion; Fourth rotation angle limiting mechanism: The limiting structure between the driving disk and the driven disk is as follows: a third rotation limiting portion is provided on the bottom surface of the first mounting slot of the driven disk; a fourth rotation limiting portion is provided on the bottom surface of the driving disk; the third rotation limiting portion cooperates with the fourth rotation limiting portion to limit the relative rotation angle of the driving disk and the driven disk; Fifth rotation angle limiting mechanism: The driving disk is further provided with a fifth rotation limiting portion at a position corresponding to the torsion spring fixing block on the fixed disk; the fifth rotation limiting portion cooperates with both sides of the torsion spring fixing block to limit the rotation angle of the driving disk relative to the fixed disk; Sixth rotation angle limiting mechanism: a third rotation limiting portion is provided on the bottom surface of the first mounting groove of the driven disk; a sixth rotation limiting portion is provided on the bottom edge of the fixed disk body of the fixed disk; the sixth rotation limiting portion cooperates with the third rotation limiting portion to limit the rotation angle of the driven disk relative to the fixed disk.

10. The steering control structure externally mounted on a steering gearbox according to claim 1, characterized in that: The clutch member is a slider; the first clutch channel is a slideway that cooperates with the slider; the second clutch channel is a slide groove that cooperates with the slider; the slider includes a slider body, and the slider body is further provided with an elastic member; the elastic member is further provided with a first locking portion on a surface that cooperates with the first clutch channel; the second clutch channel is further provided with a second locking portion and a third locking portion on a surface that cooperates with the elastic member; the second locking portion is used to lock the first locking portion when the clutch member extends into the second clutch channel, so that the clutch member remains in a state of extending into the second clutch channel; The third engaging portion is used to engage the first engaging portion when the clutch member does not extend into the second clutch channel, thereby keeping the clutch member in the first clutch channel and preventing it from entering the second clutch channel or sliding out of the first clutch channel. Alternatively, the clutch member is a screw; the first clutch channel is a screw hole that cooperates with the screw; the second clutch channel is a hole groove that cooperates with the screw; and switching between entering the second clutch channel state and leaving the second clutch channel state is achieved by screwing the screw in and out.

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