Vehicle steering gear structure

Abstract

The utility model discloses a vehicle steering gear structure, and relates to the technical field of steering gears. A vehicle steering gear structure comprises a positioning support, a circular shaft and at least one positioning structure. The positioning bracket is arranged on the outer side of the rotating shaft and is connected with the screw rod; a mounting cavity for mounting the circular shaft and the positioning structure is formed between the positioning bracket and the rotating shaft; a positioning groove for connecting a circular shaft is formed in the middle of the inner wall of the mounting cavity; the connecting end of the positioning structure is connected with the rotating shaft, and the abutting end of the positioning structure can make the circular shaft abut against the interior of the positioning groove. The steering gear structure can be switched between the steering position where the rotating shaft drives the circular shaft to break away from the positioning groove through the positioning structure and the middle position where the rotating shaft drives the circular shaft to enter the positioning groove through the positioning structure. By means of the method, a driver can have a strong neutral position feeling during steering and straight running switching, the driving experience feeling of the driver is improved, the straight running position and the steering position of the whole vehicle can be accurately and rapidly distinguished, and the operation stability of the driver is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steering gears, and in particular relates to a vehicle steering gear structure. Background Art

[0002] The steering system of a car affects the driving safety of the whole vehicle, and also has a great impact on the driving and handling stability of the whole vehicle. The steering system is in close contact with the driver, and the handling stability of the steering system largely determines the performance limit of a car and is the core performance of the whole vehicle.

[0003] Hydraulic recirculating ball steering gears are widely used in existing vehicles because of their simple structure and good reliability. Therefore, they are one of the most widely used steering gear types for trucks. However, recirculating ball steering gears have the disadvantage of fuzzy center position, which can easily cause the driver to be unable to accurately find the center position of the steering gear during the switching process between steering and straight driving, causing the driver to frequently correct the driving direction of the vehicle due to stress, and unable to accurately and quickly judge the switching state, thus affecting the vehicle's maneuverability and driving experience. Therefore, it is necessary to develop a steering gear structure with high stability that can improve the center position sensitivity and enhance the driving experience. Utility Model Content

[0004] The utility model provides a vehicle steering gear structure to solve the problem that the driver cannot accurately find the middle position of the steering gear in the process of switching between steering and straight-line driving when driving.

[0005] The technical solution adopted by the utility model is:

[0006] A vehicle steering gear structure comprises a screw and a rotating shaft rotatably connected to the screw, comprising: a positioning bracket, a round shaft and at least one positioning structure; the positioning bracket is arranged on the outside of the rotating shaft and connected to the screw, and an installation cavity for installing the round shaft and the positioning structure is formed between the positioning bracket and the rotating shaft; a positioning groove for connecting the round shaft is provided in the middle of the inner wall of the installation cavity; the connecting end of the positioning structure is connected to the rotating shaft, and the abutting end of the positioning structure can abut the round shaft against the positioning groove of the installation cavity; the steering gear structure can switch between a steering position in which the rotating shaft drives the round shaft to leave the positioning groove through the positioning structure and a middle position in which the rotating shaft drives the round shaft to enter the positioning groove through the positioning structure.

[0007] A vehicle steering gear structure of the utility model also has the following additional technical features:

[0008] The positioning structure includes a retaining frame, a sliding member and an elastic member; the retaining frame is used to connect with the rotating shaft, the sliding member is slidably connected in the retaining frame through the elastic member, and the sliding member forms an abutment end on one side of the installation cavity for abutting with the circular shaft.

[0009] The rotating shaft is provided with a mounting hole for plugging and connecting the retaining frame in the circumferential direction, and the retaining frame and the mounting hole form an interference fit; or,

[0010] The rotating shaft is provided with bolt holes for inserting bolts in the circumferential direction, and the retaining frame has a mounting end that fits with the outer circumferential surface of the rotating shaft. Bolts pass through the bolt holes so that the mounting end is firmly connected with the rotating shaft.

[0011] A limiting surface for limiting the retaining frame along the radial direction of the rotating shaft is formed in the mounting hole on the side facing the axis of the rotating shaft, and the radial dimension of the limiting surface gradually increases from the axis of the rotating shaft to the side away from the axis of the rotating shaft.

[0012] An arc-shaped guide surface is formed on one side of the installation cavity corresponding to the rotating shaft, so that the round shaft can roll along the arc-shaped guide surface when it is separated from the positioning groove under the action of the steering force of the rotating shaft.

[0013] The positioning groove is arranged in an arc shape at the center of the arc-shaped guide surface, and the center line of the positioning groove passes through the axis of the rotating shaft.

[0014] The height of the positioning groove is not higher than the radial height of the round shaft, so that the round shaft can be separated from the positioning groove under the action of the steering force of the rotating shaft.

[0015] The center of the abutting end has a limiting groove for positioning the outer circumferential surface of the circular shaft. When the steering gear structure is in the middle position, the limiting groove can be symmetrically arranged with the positioning groove on both sides of the radial direction of the circular shaft.

[0016] The plurality of positioning structures are symmetrically connected to the rotating shaft along the circumferential direction of the rotating shaft.

[0017] A fixed end for connecting with the screw is formed between two adjacent installation cavities of the positioning bracket, and the fixed end is provided with a threaded hole for inserting a fastener. The fastener cooperates with the threaded hole so that the fixed end is connected to one end of the screw.

[0018] The abutting end has a stopper portion protruding toward the round shaft, and the stopper portion is arranged on both sides of the round shaft in the radial direction, so that the round shaft is limited between the stopper portions on both sides.

[0019] Due to the adoption of the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0020] 1. The positioning bracket in the vehicle steering gear structure can be connected to the screw rod, and the screw rod is sleeved on the outer side of the rotating shaft to form an installation cavity for installing the circular shaft and the positioning structure with the rotating shaft, so that the connecting end of the positioning structure is connected to the rotating shaft, and the abutting end of the positioning structure can abut the outer circumference of the circular shaft. The circular shaft is installed in the installation cavity and clamped between the abutting end of the positioning structure and the inner wall of the installation cavity, so that when the rotating shaft rotates relative to the screw rod, the positioning structure can be driven to rotate relative to the screw rod. The abutting end of the positioning structure can drive the circular shaft to roll relative to the inner wall of the installation cavity when the steering torque of the rotating shaft is greater than the starting torque of the rolling friction of the circular shaft, thereby causing the circular shaft to leave the positioning groove. Since the positioning groove is in the middle of the installation cavity, That is, when the round shaft is in the positioning groove, the steering gear is in the neutral position. Once the round shaft is out of the positioning groove, the steering gear is in the steering stage. Therefore, since the positioning groove can perform a certain degree of positioning on the outer circumference of the round shaft, during the process of the round shaft being out of the positioning groove or entering the positioning groove, the steering gear will have an obvious neutral position sense under the action of the rolling friction between the round shaft and the inner wall of the mounting cavity. That is, the steering torque of the steering gear will be significantly increased when passing the neutral position, so that the driver can have a stronger sense of neutral position when switching between steering and straight driving, thereby improving the driver's driving experience, being able to accurately and quickly distinguish the straight driving position and steering position of the whole vehicle, and improving the driver's handling stability.

[0021] 2. As a preferred embodiment of the utility model, the positioning structure includes a retaining frame, a sliding member and an elastic member; the retaining frame is used to connect with the rotating shaft, the sliding member is slidably connected in the retaining frame through the elastic member, and the side of the sliding member facing the installation cavity forms an abutment end for abutting with the round shaft.

[0022] The positioning structure is fixedly connected to the rotating shaft by setting a retaining frame, and the sliding member is slidably connected to the retaining frame through an elastic member, so that the abutting end of the sliding member can be adapted to steering gear structures of different sizes so as to abut against the round shaft; when the steering gear structure is turning, when the torsional moment of the rotating shaft is greater than the rolling friction between the round shaft and the mounting cavity, the round shaft can disengage from the positioning groove in the process of the sliding member following the rotation of the rotating shaft, thereby realizing the switching of the steering gear structure from the neutral position to the steering position, so that the driver has a clear sense of neutral position, which improves the sense of neutral position and enhances the driving operation stability.

[0023] 3. As a preferred embodiment of the utility model, a mounting hole for plugging and connecting the retaining frame is opened in the circumferential direction of the rotating shaft, and the retaining frame and the mounting hole form an interference fit; or, a bolt hole for passing the bolt is opened in the circumferential direction of the rotating shaft, and the retaining frame has a mounting end that fits with the outer circumferential surface of the rotating shaft, and the bolt passes through the bolt hole so that the mounting end is tightly connected to the rotating shaft.

[0024] The installation form of the rotating shaft and the retaining frame is not limited to one. As one embodiment, a plurality of mounting holes in the radial direction can be opened on the circumferential side of the rotating shaft, so that one end of the retaining frame can be inserted into the mounting hole and interference fit with the mounting hole, so that the retaining frame can be fixedly connected to the rotating shaft, so that the positioning structure can rotate with the rotation of the rotating shaft; as another embodiment, a bolt hole for inserting bolts can be opened on the outer circumferential surface of the circumferential side of the rotating shaft, and the structure of the retaining frame is correspondingly designed to have a mounting end that fits the outer circumferential surface of the rotating shaft. By inserting the bolt into the mounting end and the bolt hole of the rotating shaft, the retaining frame is fixedly connected to the rotating shaft, so that the retaining frame can rotate synchronously with the rotating shaft, and during the switching process of the neutral position and steering position of the steering gear, the sliding member slidably connected in the retaining frame can rotate synchronously with the rotating shaft, and the sliding member can drive the round shaft to roll along the inner side of the mounting cavity, so that the round shaft can be separated from or enter the positioning groove, thereby ultimately achieving the neutral position feeling brought to the driver by the enhanced steering gear structure.

[0025] 4. As a preferred embodiment of the utility model, a limiting surface is formed in the mounting hole on the side facing the axis of the rotating shaft to limit the retaining frame along the radial direction of the rotating shaft, and the radial dimension of the limiting surface gradually increases from the side of the axis of the rotating shaft to the side away from the axis of the rotating shaft.

[0026] The side of the mounting hole facing the axis of the rotating shaft has a limiting surface capable of limiting the position of the retainer. In order to realize the limiting function, the radial dimension of the limiting surface from the side of the axis of the rotating shaft to the side away from the axis of the rotating shaft is gradually increased, so that the movement of the retainer along the radial direction of the rotating shaft is limited, and the end of the retainer inserted into the mounting hole is prevented from being separated from the side of the mounting hole close to the axis of the rotating shaft; on the one hand, the positioning of the retainer is realized, and on the other hand, the fastening connection between the retainer and the rotating shaft can be further strengthened. Thereby, the overall connection strength of the steering gear structure is enhanced, and the rotating shaft can drive the retainer in the positioning structure to rotate synchronously, thereby enhancing the stability of the operation.

[0027] 5. As a preferred embodiment of the present invention, an arc-shaped guide surface is formed on one side of the installation cavity corresponding to the rotating shaft, so that the round shaft can roll along the arc-shaped guide surface when it leaves the positioning groove under the torsional torque of the rotating shaft.

[0028] The function of the mounting cavity is to reserve sliding space for the sliding part, so as to realize the installation of the round shaft; because the round shaft abuts between the abutting end of the sliding part and the inner side of the mounting cavity under the action of the sliding part, in order to realize that the sliding part drives the round shaft to roll out of the positioning groove under the rotation of the rotating shaft, and can roll along the inner side of the mounting cavity, the inner side of the mounting cavity, that is, the side corresponding to the rotating shaft, is set as an arc-shaped guide surface, so that the outer circumferential surface of the round shaft can roll along the arc-shaped guide surface, thereby realizing the switching between the neutral position and the steering position of the steering gear structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0030] Figure 1 It is a front cross-sectional structural diagram of a vehicle steering gear structure in one embodiment of the utility model;

[0031] Figure 2 A cross-sectional structural diagram of a vehicle steering gear structure in one embodiment of the utility model;

[0032] Figure 3 It is a structural schematic diagram of a vehicle steering gear structure according to one embodiment of the utility model, in which a round shaft is located in a positioning groove when the steering gear is in a neutral position;

[0033] Figure 4 It is a structural schematic diagram of a vehicle steering gear structure in one embodiment of the utility model, in which a round shaft is out of a positioning groove when the steering gear is in a steering position;

[0034] In the figure,

[0035] 1 rotating shaft, 2 screw rods, 3 positioning grooves, 4 positioning brackets, 5 round shafts;

[0036] 6 positioning structure, 61 retaining frame, 62 sliding member, 63 elastic member;

[0037] 7 mounting cavity, 8 arc-shaped guide surface, 9 mounting hole, 10 limiting surface, 11 torsion bar, 12 fastener, 13 limiting groove. DETAILED DESCRIPTION

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0039] In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0042] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0043] The utility model relates to a vehicle steering gear structure, such as Figure 1-4 As shown, it includes a screw rod 2 and a rotating shaft 1 rotatably connected to the screw rod 2, including: a positioning bracket 4, a round shaft 5 and at least one positioning structure 6; the positioning bracket 4 is arranged on the outside of the rotating shaft 1 and connected to the screw rod 2, and a mounting cavity 7 for mounting the round shaft 5 and the positioning structure 6 is formed between the positioning bracket 4 and the rotating shaft 1; a positioning groove for connecting the round shaft 5 is provided in the middle of the inner wall of the mounting cavity 7; the connecting end of the positioning structure 6 is connected to the rotating shaft 1, and the abutting end of the positioning structure 6 can abut the round shaft 5 against the positioning groove 3 of the mounting cavity 7; the steering gear structure can switch between a steering position in which the rotating shaft 1 drives the round shaft 5 to leave the positioning groove 3 through the positioning structure 6 and a middle position in which the rotating shaft 1 drives the round shaft 5 to enter the positioning groove 3 through the positioning structure 6.

[0044] The traditional design method is that the shaft 1 is rotatably connected to one end of the screw 2 and extends to the outside for connection with the steering wheel. The rotation of the steering wheel can drive the shaft 1 to rotate, one end of the torsion bar 11 can extend to the inside of the shaft 1, and the other end of the torsion bar 11 can extend into the screw 2, so that when the steering wheel rotates, the shaft 1 can rotate relative to the screw 2, and the torsion bar 11 drives the screw 2 to rotate under the drive of the shaft 1, and gradually transfers the steering torque from one side of the shaft 1 to the screw 2. During the torque transmission process, the middle position is relatively vague, which easily causes the driver to switch between straight driving and steering during driving. The middle position cannot be accurately perceived, causing the driver to frequently correct the driving direction of the whole vehicle due to stress, and cannot accurately and quickly judge the switching state, thereby affecting the maneuverability and driving experience of the whole vehicle. The present application sets a positioning bracket 4, a circular shaft 5 and at least one positioning structure 6 to achieve that when the shaft 1 rotates relative to the screw 2, the sensing force of the middle position of the steering gear structure can be improved, and the accurate sensing of the driver's middle position can be improved, thereby avoiding the situation of frequently correcting the driving direction.

[0045] Specifically, the positioning bracket 4 in the vehicle steering gear structure can be connected to the screw rod 2, and the screw rod 2 is sleeved on the outer side of the rotating shaft 1 to form an installation cavity 7 for installing the circular shaft 5 and the positioning structure 6 between the rotating shaft 1, so that the connecting end of the positioning structure 6 is connected to the rotating shaft 1, and the abutting end of the positioning structure 6 can abut the outer circumference of the circular shaft 5. The circular shaft 5 is installed in the installation cavity 7 and clamped between the abutting end of the positioning structure 6 and the inner wall of the installation cavity 7, so that when the rotating shaft 1 rotates relative to the screw rod 2, the positioning structure 6 can be driven to rotate relative to the screw rod 2. The abutting end of the positioning structure 6 can drive the circular shaft 5 to roll relative to the inner wall of the installation cavity 7 when the steering torque of the rotating shaft 1 is greater than the starting torque of the rolling friction of the circular shaft 5, thereby causing the circular shaft 5 to disengage from the positioning groove 3. Due to the positioning groove 3 When the round shaft 5 is in the middle of the installation cavity 7, that is, the round shaft 5 is in the positioning groove 3, the steering gear is in the neutral position. Once the round shaft 5 is out of the positioning groove 3, the steering gear is in the steering stage. Therefore, since the positioning groove 3 can perform a certain degree of positioning on the outer circumferential surface of the round shaft 5, during the process of the round shaft 5 being out of the positioning groove 3 or entering the positioning groove 3, the rolling friction between the round shaft 5 and the inner wall of the installation cavity 7 will make the steering gear have an obvious neutral position sense, that is, the steering torque of the steering gear will be significantly increased when passing the neutral position, so that the driver can have a stronger neutral position sense when switching between steering and straight driving, thereby improving the driver's driving experience, being able to accurately and quickly distinguish the straight driving position and steering position of the whole vehicle, and improving the driver's handling stability.

[0046] As a preferred implementation of the present application, Figure 2As shown, the positioning structure 6 includes a retaining frame 61, a sliding member 62 and an elastic member 63; the retaining frame 61 is used to connect with the rotating shaft 1, and the sliding member 62 is slidably connected in the retaining frame 61 through the elastic member 63, and the sliding member 62 forms an abutting end on the side facing the mounting cavity 7 for abutting against the round shaft 5.

[0047] By setting a retaining frame 61, the positioning structure 6 is fixedly connected to the rotating shaft 1, and the sliding member 62 is slidably connected to the retaining frame 61 through the elastic member 63, so that the abutting end of the sliding member 62 can be adapted to the steering gear structure of different sizes so as to abut against the circular shaft 5; when the steering gear structure is turning, when the torsional moment of the rotating shaft 1 is greater than the rolling friction between the circular shaft 5 and the mounting cavity 7, the circular shaft 5 can be disengaged from the positioning groove 3 in the process of the sliding member 62 following the rotation of the rotating shaft 1, so that the steering gear structure can be switched from the neutral position to the steering position, so that the driver has a clear sense of neutral position, which improves the sense of neutral position and enhances the driving operation stability.

[0048] It is worth noting that the elastic member 63 here can be a spring or a torsion spring or other elastic connecting structural member, as long as it can play an elastic connection between the sliding member 62 and the retaining frame 61, so that the sliding member 62 can slide along the retaining frame 61 under the action of the elastic member 63 to achieve abutment connection with the outer circumferential surface of the circular shaft 5.

[0049] As a preferred embodiment of the present application, a mounting hole 9 for plugging and connecting the retaining frame 61 is opened in the circumferential direction of the rotating shaft 1, and the retaining frame 61 forms an interference fit with the mounting hole 9; or, a bolt hole for passing the bolt is opened in the circumferential direction of the rotating shaft 1, and the retaining frame 61 has a mounting end that fits with the outer circumferential surface of the rotating shaft 1, and the bolt passes through the bolt hole so that the mounting end is tightly connected to the rotating shaft 1.

[0050] The installation form of the rotating shaft 1 and the retaining frame 61 is not limited to one, and is not specifically limited by the present application, and any of the following implementations may be adopted:

[0051] As one of the preferred embodiments, a plurality of mounting holes 9 along the radial direction can be opened on the circumferential side of the rotating shaft 1, so that one end of the retainer 61 can be inserted into the mounting hole 9 and have an interference fit with the mounting hole 9, so that the retainer 61 can be fixedly connected to the rotating shaft 1, so that the positioning structure 6 can rotate with the rotation of the rotating shaft 1;

[0052] As another embodiment, bolt holes for installing bolts can be opened on the outer circumferential surface of the circumferential side of the rotating shaft 1, and the structure of the retaining frame 61 is correspondingly designed to have a mounting end that fits with the outer circumferential surface of the rotating shaft 1. By inserting the bolt into the mounting end and the bolt hole of the rotating shaft 1, the retaining frame 61 is fixedly connected to the rotating shaft 1, so that the retaining frame 61 can rotate synchronously with the rotating shaft 1, and during the switching process of the neutral position and steering position of the steering gear, the sliding member 62 slidably connected in the retaining frame 61 can rotate synchronously with the rotating shaft 1, and the sliding member 62 can drive the round shaft 5 to roll along the inner side of the mounting cavity 7, so that the round shaft 5 can be separated from the positioning groove 3 or enter the positioning groove 3, thereby finally achieving the neutral position feeling brought to the driver by the enhanced steering gear structure.

[0053] As a preferred embodiment of the present application, a limiting surface 10 is formed in the mounting hole 9 on the side facing the axis of the rotating shaft 1 for limiting the retaining frame 61 along the radial direction of the rotating shaft 1, and the radial dimension of the limiting surface 10 gradually increases from the side of the axis of the rotating shaft 1 to the side away from the axis of the rotating shaft 1.

[0054] The side of the mounting hole 9 facing the axis of the rotating shaft 1 is provided with a limiting surface 10 capable of limiting the position of the retainer 61. In order to realize the limiting function, the radial dimension of the limiting surface 10 from the side of the axis of the rotating shaft 1 to the side away from the axis of the rotating shaft 1 is gradually increased, so that the movement of the retainer 61 along the radial direction of the rotating shaft 1 is limited, and the end of the retainer 61 inserted into the mounting hole 9 is prevented from being separated from the side of the mounting hole 9 close to the axis of the rotating shaft 1; on the one hand, the positioning of the retainer 61 is realized, and on the other hand, the fastening connection between the retainer 61 and the rotating shaft 1 can be further strengthened. Thereby, the overall connection strength of the steering gear structure is enhanced, and the rotating shaft 1 can drive the retainer 61 in the positioning structure 6 to rotate synchronously, thereby enhancing the stability of the operation.

[0055] As a preferred implementation of the present application, Figure 2 As shown, an arc-shaped guide surface 8 is formed on one side of the installation cavity 7 corresponding to the rotating shaft 1 so that the round shaft 5 can roll along the arc-shaped guide surface 8 when it is separated from the positioning groove 3 under the torsional moment of the rotating shaft 1 .

[0056] The function of the installation cavity 7 is to reserve sliding space for the sliding member 62, so as to realize the installation of the round shaft 5; because the round shaft 5 abuts between the abutting end of the sliding member 62 and the inner side of the installation cavity 7 under the action of the sliding member 62, in order to realize that the sliding member 62 drives the round shaft 5 to roll out of the positioning groove 3 under the rotation of the rotating shaft 1, and can roll along the inner side of the installation cavity 7, the inner side of the installation cavity 7, that is, the side corresponding to the rotating shaft 1, is set as an arc-shaped guide surface 8, so that the outer circumferential surface of the round shaft 5 can roll along the arc-shaped guide surface 8, thereby realizing the switching between the neutral position and the steering position of the steering gear structure.

[0057] As a preferred embodiment of the present application, the positioning groove 3 is arranged at the center of the arc-shaped guide surface 8 , and the center line of the positioning groove 3 passes through the axis of the rotating shaft 1 .

[0058] The positioning groove 3 is arranged at the center of the arc-shaped guide surface 8, and the center line of the positioning groove 3 passes through the axis of the rotating shaft 1, so that the middle position is located at the center of the steering gear structure.

[0059] As a preferred embodiment of the present application, the height of the positioning groove 3 is not higher than the radial height of the round shaft 5 , so that the round shaft 5 can be separated from the positioning groove 3 under the torsional torque of the rotating shaft 1 .

[0060] The purpose of the height of the positioning groove 3 being not higher than the height of the circular shaft 5 in the radial direction is to prevent more than half of the circular shaft 5 from being located in the positioning groove 3. As a result, when the rotating shaft 1 turns, the retaining frame 61, the sliding member 62 and the elastic member 63 of the positioning structure 6 are driven to rotate together, and the sliding member 62 cannot drive the circular shaft 5 to disengage from the positioning groove 3, resulting in the jamming of the steering gear structure. Therefore, the radial height of the circular shaft 5 is greater than the height of the positioning groove 3, and the groove edge of the positioning groove 3 only needs to play a certain limiting role on the outer circumferential surface of the circular shaft 5. In the steering process of the rotating shaft 1, due to the existence of the rolling friction starting torque on the circular shaft 5, the steering torque will be significantly increased when the rotating shaft 1 rotates to the middle position, thereby realizing that the steering gear has an obvious neutral position sense, and the driver can easily distinguish the straight position and the turning position of the whole vehicle, which can effectively improve the driving stability and handling stability of the whole vehicle.

[0061] As a preferred embodiment of the present application, the center of the end face of the abutting end facing the circular shaft has a limiting groove 13 for positioning the outer circumferential surface of the circular shaft. When the steering gear structure is in the middle position, the limiting groove 13 can be symmetrically arranged with the positioning groove 3 on both sides of the radial direction of the circular shaft 5.

[0062] In order to enhance the connection strength of the abutment end to the round shaft 5, enhance the driving force of the abutment end to the round shaft 5, and further prevent the round shaft 5 from being separated between the abutment end and the mounting cavity 7, a limiting groove 13 corresponding to the positioning groove 3 is opened at the center of the end surface of the abutment end facing the round shaft, such as Figure 3 As shown, when the center lines of the limiting groove 13 and the positioning groove 3 coincide with each other along the radial direction of the rotating shaft, the circular shaft 5 is located between the positioning groove 3 and the limiting groove 13, and the positioning groove 3 and the limiting groove 13 are symmetrically arranged on both sides of the radial direction of the circumference. At this time, the steering gear structure is in the middle position; Figure 4 As shown, when the rotating shaft drives the positioning structure 6 to rotate, the abutting end drives the round shaft to roll along the arc-shaped guide surface 8, and at this time the round shaft can be separated from the limiting groove 13 and the positioning groove 3.

[0063] As a preferred embodiment of the present application, a plurality of positioning structures 6 are symmetrically connected to the rotating shaft 1 along the circumferential direction of the rotating shaft 1 .

[0064] The positioning structure 6 is symmetrically arranged on both sides of the shaft 1 in the radial direction, so as to achieve uniform distribution of the steering torque during the steering of the shaft 1 and avoid the shaft 1 from being skewed relative to the screw 2, which would lead to unstable operation of the steering gear structure.

[0065] As a preferred embodiment of the present application, a fixed end for connecting with the screw rod 2 is formed between two adjacent installation cavities 7 of the positioning bracket 4, and a threaded hole for inserting a fastener 12 is opened at the fixed end. The fastener 12 cooperates with the threaded hole so that the fixed end is connected to one end of the screw rod 2.

[0066] Only one positioning structure 6 can be installed in one installation cavity 7. In order to install multiple positioning structures 6, multiple installation cavities 7 need to be formed between the positioning bracket 4 and the rotating shaft 1. In order to achieve a fixed and stable connection between the positioning bracket 4 and the screw rod 2, a fixed end of a solid structure needs to be provided between two adjacent installation cavities 7. The fixed end is provided with a threaded hole that passes through the fixed end along the axial direction of the positioning bracket 4. During installation, the positioning bracket 4 is sleeved on the outside of the rotating shaft 1, and one end face of the fixed end of the positioning bracket 4 along the axial direction is connected to one end face of the screw rod 2 along the axial direction. The fastener 12 is passed through the threaded hole of the fixed end and the corresponding hole on the screw rod 2 to achieve the connection between the positioning bracket 4 and the screw rod 2.

[0067] It is worth noting that the fastener 12 here can be a bolt, a screw, a pin, or other structural parts that can achieve a fastened connection, and the present application does not make any specific limitation on this.

[0068] As a preferred embodiment of the present application, the abutting end has a stopper protruding toward the round shaft 5, and the stopper is arranged on both sides of the round shaft 5 in the radial direction so that the round shaft 5 is limited between the stoppers on both sides.

[0069] The abutting end of the sliding member 62 can be provided with a blocking portion protruding from the end surface of the abutting end of the sliding member 62. The blocking portion can be an arc-shaped structure, a plate-shaped structure, or a columnar structure. There is no specific limitation on the specific shape. The blocking portion is connected to the abutting end and is distributed on both sides of the radial direction of the circular shaft 5. The purpose is to strengthen the limiting effect on the circular shaft 5 along the extension direction of the arc-shaped guide surface 8 to prevent the circular shaft 5 from detaching from the abutting end. It can also strengthen the driving effect on the circular shaft 5, so that the circular shaft 5 rolls along the arc-shaped guide surface 8 under the action of the abutting end, and effectively switches between entering the positioning groove 3 and detaching from the positioning groove 3.

[0070] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0071] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0072] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A vehicle steering gear structure, comprising a screw and a rotating shaft rotatably connected to the screw, characterized in that: include: A positioning bracket, a round shaft and at least one positioning structure; the positioning bracket is arranged on the outside of the rotating shaft and connected to the screw, and an installation cavity for installing the round shaft and the positioning structure is formed between the positioning bracket and the rotating shaft; a positioning groove for connecting the round shaft is provided in the middle of the inner wall of the installation cavity; the connecting end of the positioning structure is connected to the rotating shaft, and the abutting end of the positioning structure can abut the round shaft in the positioning groove; the steering gear structure can switch between a steering position in which the rotating shaft drives the round shaft to leave the positioning groove through the positioning structure and a middle position in which the rotating shaft drives the round shaft to enter the positioning groove through the positioning structure.

2. A vehicle steering gear structure according to claim 1, characterized in that: The positioning structure includes a retaining frame, a sliding member and an elastic member; the retaining frame is used to connect with the rotating shaft, the sliding member is slidably connected in the retaining frame through the elastic member, and the sliding member forms an abutment end on one side of the installation cavity for abutting with the circular shaft.

3. A vehicle steering gear structure according to claim 2, characterized in that: The rotating shaft is provided with a mounting hole for plugging and connecting the retaining frame in the circumferential direction, and the retaining frame and the mounting hole form an interference fit; or, The rotating shaft is provided with bolt holes for inserting bolts in the circumferential direction, and the retaining frame has a mounting end that fits with the outer circumferential surface of the rotating shaft. Bolts pass through the bolt holes so that the mounting end is firmly connected with the rotating shaft.

4. A vehicle steering gear structure according to claim 3, characterized in that: A limiting surface for limiting the retaining frame along the radial direction of the rotating shaft is formed in the mounting hole on the side facing the axis of the rotating shaft, and the radial dimension of the limiting surface gradually increases from the axis of the rotating shaft to the side away from the axis of the rotating shaft.

5. A vehicle steering gear structure according to claim 1, characterized in that: An arc-shaped guide surface is formed on one side of the installation cavity corresponding to the rotating shaft, so that the round shaft can roll along the arc-shaped guide surface when it is separated from the positioning groove under the action of the steering force of the rotating shaft.

6. A vehicle steering gear structure according to claim 5, characterized in that: The positioning groove is arranged in an arc shape at the center of the arc-shaped guide surface, and the center line of the positioning groove passes through the axis of the rotating shaft.

7. A vehicle steering gear structure according to claim 1, characterized in that: The height of the positioning groove is not higher than the radial height of the round shaft, so that the round shaft can be separated from the positioning groove under the action of the steering force of the rotating shaft.

8. A vehicle steering gear structure according to claim 1, characterized in that: The center of the abutting end has a limiting groove for positioning the outer circumferential surface of the circular shaft. When the steering gear structure is in the middle position, the limiting groove can be symmetrically arranged with the positioning groove on both sides of the radial direction of the circular shaft.

9. A vehicle steering gear structure according to claim 1, characterized in that: A fixed end for connecting with the screw is formed between two adjacent installation cavities of the positioning bracket, and the fixed end is provided with a threaded hole for inserting a fastener. The fastener cooperates with the threaded hole so that the fixed end is connected to one end of the screw.

10. A vehicle steering gear structure according to claim 1, characterized in that: The abutting end has a stopper portion protruding toward the round shaft, and the stopper portion is arranged on both sides of the round shaft in the radial direction, so that the round shaft is limited between the stopper portions on both sides.

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