Bevel gear clearance adjusting method, gear shaft clearance adjusting structure, steering gear and vehicle

Abstract

The embodiment of the invention provides a bevel gear clearance adjusting method, a gear shaft clearance adjusting structure, a steering gear and a vehicle, and relates to the technical field of automobile steering systems. The bevel gear clearance adjusting method comprises the following steps that parameters of a bevel gear shaft are obtained; according to the parameters of the bevel gear shaft, the value interval of the displacement coefficient is calculated; according to the maximum value and the minimum value of the displacement coefficient, the included angle between the bevel gear shaft and the axis is calculated; obtaining a production tolerance; calculating the axial displacement range of the bevel gear shaft according to the production tolerance and the included angle; and calculating parameters of the spring according to the axial displacement range. Arranging a spring, a bevel gear shaft, a bearing and a rack; the bevel gear shaft is meshed with the rack, and the bearing sleeves the bevel gear shaft; one end of the spring abuts against the bearing, and the other end of the spring abuts against the end face of the bevel gear shaft. According to the method, the parameters of the spring for adjusting the gap can be determined according to bevel gear shafts of different specifications, so that the gap caused by abrasion between the bevel gear shafts and the rack is eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of automobile steering systems, and in particular to a bevel gear clearance adjustment method, a gear shaft clearance adjustment structure, a steering gear and a vehicle. Background Art

[0002] As the automobile market has developed, people have increasingly higher requirements for the comfort of passenger cars, and are increasingly sensitive to abnormal noises generated when the steering wheel of the vehicle is changed or when driving on bumpy roads. The rack and pinion steering gear with tie rod assembly is an important component of the car. As the car is driven for a long time, the various parts of the steering gear will wear out due to relative movement, and the gaps between the parts will also increase. Therefore, it is easy to produce abnormal noises, and even reduce the performance of the steering system, affecting the performance of the vehicle and the driving comfort of the driver. Therefore, a gap adjustment structure is set in the steering gear.

[0003] However, most of the current gap adjustment structures have a large number of parts, a complex structure, and are not universal. Summary of the invention

[0004] The present invention provides a bevel gear clearance adjustment method, a gear shaft clearance adjustment structure, a steering gear and a vehicle, which can determine the parameters of a clearance adjustment spring according to bevel gear shafts of different specifications to eliminate the clearance caused by wear between the bevel gear shaft and the rack, and has universality; and can simplify the clearance adjustment structure.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a bevel gear clearance adjustment method, which includes:

[0007] Get the parameters of the bevel gear shaft;

[0008] Calculate the value range of the displacement coefficient according to the parameters of the bevel gear shaft;

[0009] Calculate the angle between the bevel gear shaft and the axis according to the maximum and minimum values ​​of the modification coefficient;

[0010] Get production tolerances;

[0011] Calculating the axial displacement range of the bevel gear shaft according to the production tolerance and the included angle;

[0012] Calculating the parameters of the spring according to the axial displacement range;

[0013] The spring is arranged and the bevel gear shaft, bearing and rack are installed; the bevel gear shaft is meshed with the rack, and the bearing is sleeved on the bevel gear shaft; one end of the spring is against the bearing, and the other end of the spring is against the end face of the bevel gear shaft.

[0014] In an optional embodiment, obtaining the production tolerance includes obtaining the radial clearance tolerance of each part after dispersion and accumulation.

[0015] In an optional implementation, the calculating the axial displacement range of the bevel gear shaft according to the production tolerance and the included angle comprises:

[0016] The axial displacement is calculated according to the formula: axial displacement = radial clearance tolerance ÷ tan angle; and the axial displacement range of the bevel gear shaft is obtained according to the obtained axial displacement.

[0017] In an optional implementation, calculating the parameters of the spring according to the axial displacement range includes:

[0018] When the axial displacement is the maximum value in the reverse direction, the preload force of the spring must be greater than the torque of the motor that drives the bevel gear shaft to rotate; when the axial displacement is the maximum value in the positive direction, the stress generated by the spring must be less than the maximum stress allowed by the device in order to calculate the parameters of the spring.

[0019] In an optional embodiment, obtaining the parameters of the bevel gear shaft includes obtaining the number of teeth, pressure angle, module and width of the bevel gear.

[0020] An embodiment of the present invention further provides a gear shaft clearance adjustment structure, comprising:

[0021] case;

[0022] A bevel gear shaft, wherein the bevel gear shaft is mounted on the housing through a bearing;

[0023] A rack, the rack being located in the housing and meshing with the bevel gear shaft;

[0024] A spring is sleeved on the bevel gear shaft, one end of the spring abuts against the bearing, and the other end of the spring abuts against the end surface of the bevel gear shaft.

[0025] In an optional embodiment, the gear shaft clearance adjustment structure further includes a sensor, wherein the sensor is disposed on the bevel gear shaft, and the sensor is used to detect a rotation angle of the bevel gear shaft.

[0026] In an optional embodiment, the bearing includes a first bearing and a second bearing, and the first bearing and the second bearing are respectively installed at both ends of the bevel gear shaft; the first bearing is arranged at one end of the bevel gear shaft close to the rack; one end of the spring is abutted against the second bearing, and the other end of the spring is abutted against the end face of the bevel gear shaft; the first bearing is a sliding bearing, and the second bearing is a deep groove ball bearing.

[0027] An embodiment of the present invention further provides a steering gear, comprising the gear shaft clearance adjustment structure described in any one of the above embodiments.

[0028] An embodiment of the present invention further provides a vehicle, comprising a vehicle body and the steering gear described in the above embodiment, wherein the steering gear is arranged in the vehicle body.

[0029] The bevel gear clearance adjustment method, gear shaft clearance adjustment structure, steering gear and vehicle of the embodiments of the present invention have beneficial effects, for example:

[0030] The bevel gear clearance adjustment method includes the following steps: obtaining the parameters of the bevel gear shaft; calculating the value range of the displacement coefficient according to the parameters of the bevel gear shaft; calculating the angle between the bevel gear shaft and the axis according to the maximum and minimum values ​​of the displacement coefficient; obtaining the production tolerance; calculating the axial displacement range of the bevel gear shaft according to the production tolerance and the angle; calculating the parameters of the spring according to the axial displacement range; the bevel gear clearance adjustment method can determine the parameters of the spring for adjusting the clearance according to bevel gear shafts of different specifications to eliminate the clearance caused by wear between the bevel gear shaft and the rack, so as to improve steering accuracy, enhance steering stability and safety, and has universality. The spring is set and the bevel gear shaft, bearing and rack are installed; the bevel gear shaft is meshed with the rack, and the bearing is sleeved on the bevel gear shaft; one end of the spring is against the bearing, and the other end of the spring is against the end face of the bevel gear shaft. By setting the position of the spring and the bevel gear shaft as described above, the number of parts of the clearance adjustment structure can be reduced, the cost can be reduced, and the assembly efficiency can be improved.

[0031] The gear shaft clearance adjustment structure includes a housing, a bevel gear shaft, a rack and a spring. The bevel gear shaft is installed on the housing through a bearing. The rack is located in the housing and meshes with the bevel gear shaft. The spring is sleeved on the bevel gear shaft, and one end of the spring abuts against the bearing, and the other end of the spring abuts against the end face of the bevel gear shaft. By sleeved on the bevel gear shaft and coaxially adjusting with the bevel gear shaft, the clearance adjustment structure can be simplified, the number of parts of the clearance adjustment structure can be reduced, the cost can be reduced, the assembly process can be simplified, and the assembly efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic flow chart of a bevel gear clearance adjustment method provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a gear shaft clearance adjustment structure provided in an embodiment of the present invention;

[0035] Figure 3 The figure is a schematic diagram of the geometric relationship between the meshing of the rack and the bevel gear provided in the embodiment of the present invention.

[0036] Icon: 1000-gear shaft clearance adjustment structure; 100-housing; 110-first housing; 120-second housing; 200-bevel gear shaft; 300-rack; 400-spring; 500-bearing; 510-first bearing; 520-second bearing; 600-sensor; 700-rotor; 800-sealing ring; 900-bolt. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They 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.

[0041] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0042] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0043] As the automobile market has developed, people's requirements for the comfort of passenger cars have been increasing, and they are becoming more and more sensitive to the abnormal noise generated when the steering wheel of the vehicle is changed or when driving on bumpy roads. The rack and pinion steering gear with tie rod assembly is an important component of the automobile. As the car is driven for a long time, the various parts of the steering gear will wear out due to relative movement, and the gaps between the parts will also increase. Therefore, it is easy to produce abnormal noise, and even reduce the performance of the steering system, affecting the performance of the whole vehicle and the driving comfort of the driver. Therefore, a gap adjustment structure is set in the steering gear. However, most of the current bevel gear gap adjustment structures have a large number of parts, a complex structure, and are not universal.

[0044] Based on this, see Figure 1 and Figure 2 The bevel gear clearance adjustment method and the gear shaft clearance adjustment structure 1000 provided in the embodiments of the present invention can effectively improve the technical problems mentioned above. The bevel gear clearance adjustment method can determine the parameters of the spring 400 for adjusting the clearance for bevel gear shafts 200 of different specifications to eliminate the clearance caused by wear between the bevel gear shaft 200 and the rack 300, and has universality; and can simplify the clearance adjustment structure. The gear shaft clearance adjustment structure 1000 can reduce the number of parts of the clearance adjustment structure, simplify the overall structure, reduce costs, simplify the assembly process, and improve assembly efficiency. The gear shaft clearance adjustment structure 1000 is applied to a steering gear, and the steering gear can be applied to a vehicle. The steering gear, vehicle and other devices having the gear shaft clearance adjustment structure 1000 all have the functions mentioned above, which will not be elaborated here.

[0045] Figure 1 FIG. 1 is a flow chart of a bevel gear clearance adjustment method provided in an embodiment of the present invention, as shown in FIG. Figure 1 As shown, the bevel gear clearance adjustment method provided in this embodiment includes the following steps:

[0046] Obtain parameters of the bevel gear shaft 200;

[0047] Obtaining the parameters of the bevel gear shaft 200 includes obtaining the number of teeth, pressure angle, module and width of the bevel gear. The pressure angle is the angle between the direction of the force and the gear axis when the two gears are meshing. It is the transmission angle of the force during the gear meshing process, which affects the transmission efficiency, the load capacity of the gear and the friction when the gear is meshing.

[0048] According to the parameters of the bevel gear shaft 200, the value range of the displacement coefficient is calculated;

[0049] According to the maximum and minimum values ​​of the modification coefficient, calculate the angle c between the bevel gear shaft 200 and the axis;

[0050] Here, the angle between the bevel gear shaft 200 and the axis is the taper of the bevel gear shaft 200 .

[0051] Get production tolerances;

[0052] Obtaining production tolerances includes obtaining the radial clearance tolerance after the dispersion and accumulation of each part. Due to the manufacturing tolerances of each component, the axial position of the bevel gear shaft is different under different sizes. Therefore, it is necessary to obtain the production tolerance of each component to obtain the total assembly tolerance and obtain the radial clearance tolerance.

[0053] Calculate the axial displacement range of the bevel gear shaft 200 according to the production tolerance and the included angle;

[0054] The axial displacement is calculated according to the formula: axial displacement = radial clearance tolerance / tan angle; and the axial displacement range of the bevel gear shaft 200 is obtained according to the obtained axial displacement.

[0055] Figure 3 FIG. 1 is a schematic diagram of the geometric relationship between the rack 300 and the bevel gear provided in the embodiment of the present invention. Figure 1 , and combined with Figure 3 According to the meshing mode of the rack 300 and the bevel gear, the geometric relationship between the axial displacement b and the radial clearance tolerance a can be obtained. The axial displacement b, the radial clearance tolerance a and the hypotenuse of the bevel gear together form a right triangle, and the axial displacement b and the radial clearance tolerance a are two right-angled sides. The angle corresponding to the right-angled side where the radial clearance tolerance a is located is the angle c between the bevel gear shaft 200 and the axis, that is, the taper of the bevel gear shaft 200. That is, the formula is b = a ÷ tanc.

[0056] Calculate the parameters of the spring 400 according to the axial displacement range;

[0057] When the axial displacement is the maximum value in the reverse direction, the preload force of the spring 400 must be greater than the torque of the motor driving the bevel gear shaft 200 to rotate;

[0058] When the axial displacement is the maximum positive value, the stress generated by the spring 400 must be less than the maximum stress allowed by the device in order to calculate the parameters of the spring 400.

[0059] A spring 400 is provided and a bevel gear shaft 200 , a bearing 500 and a rack 300 are installed; the bevel gear shaft 200 is meshed with the rack 300 , and the bearing 500 is sleeved on the bevel gear shaft 200 ; one end of the spring 400 abuts against the bearing 500 , and the other end of the spring 400 abuts against the end face of the bevel gear shaft 200 .

[0060] Specifically, in a certain embodiment, a given bevel gear shaft 200 includes the following parameters: module 2, number of teeth 18, pressure angle 20°, width 41 mm. According to the basic requirements and formulas for gear meshing, the displacement coefficients of the large end and the small end of the bevel gear shaft 200 are calculated: the displacement coefficient of the large end is 1.45, and the displacement coefficient of the small end is 0. Then, the taper of the bevel gear shaft is calculated from the displacement coefficients of the large end and the small end, and the taper is 4°. The radial clearance tolerance in this embodiment is obtained to be +0.322mm / -0.0565mm. And from the clearance tolerance, it can be calculated that the axial displacement of the bevel gear shaft is approximately +4.6mm / -1.7mm.

[0061] Then design the spring 400. If the maximum axial force on the bevel gear shaft during the movement is 200N, the preload force provided by the spring 400 when the bevel gear shaft is at the bottom position must be at least 200N. Take the stiffness of spring 400 = 25N / mm. Then when the bevel gear shaft is at the top, the preload force of spring 400 is 356.89N. According to the design requirements of spring 400, it can be calculated that: spring 400 wire diameter: 3.3mm; spring 400 middle diameter: 19.3mm; design position working height: 30.29mm; spring 400 free height: 42.88mm.

[0062] When the bevel gear shaft 200 is of other specifications, the parameters may be other values, which are determined according to actual use requirements and are not limited here.

[0063] The vehicle in this embodiment includes a vehicle body and a steering gear, which is arranged in the vehicle body and is used to realize vehicle steering. The steering gear mainly converts the rotational motion on the steering wheel into the rotation of the front wheels. It transmits the rotational force applied by the driver through the steering wheel to the gears, pull rods, connecting rods and other components in the steering system, thereby guiding the vehicle to change the driving direction. The steering gear determines the relationship between the angle of rotation of the steering wheel and the angle of rotation of the front wheels, thereby affecting the accuracy and sensitivity of the steering. Of course, the vehicle may also include a power-assist system, which is connected to the steering gear, and the power-assist system is used to reduce the force required by the driver when operating the steering wheel. Under the action of the power-assist system, the steering gear can greatly reduce the burden on the driver, especially when driving at low speed or parking, the driver can perform steering operations more easily. Through the reasonably designed steering gear and power-assist system, the vehicle can provide a more stable and comfortable steering experience, reduce the vibration and noise during steering, and improve the sense of control, so that the driver can operate the steering wheel more freely. In addition, the vehicle may also include other devices or structures to realize the various functions of the vehicle, which are not limited here.

[0064] The steering gear (not shown in the figure) in this embodiment includes a gear shaft clearance adjustment structure 1000 and a control unit. The control unit is connected to the gear shaft clearance adjustment structure 1000 to manage steering feedback, and can dynamically adjust the gear shaft clearance adjustment structure 1000 according to vehicle speed, road conditions, etc. In addition, the steering gear may also include structures such as a limit device and a lubrication system. The limit device is used to control the stroke of the rack 300 to ensure that it moves within a certain range to prevent oversteering or damage to mechanical parts. The gear and rack 300 will generate friction during movement, so they are usually equipped with a lubrication system. Lubricating oil or grease can reduce friction, improve efficiency, and extend the life of the system. And in order to avoid dust and dirt from entering, a closed lubrication system can be used. Of course, the steering gear may also include other device structures to meet the various functions of the steering gear, which are not limited here.

[0065] Figure 2 This is a schematic diagram of a gear shaft clearance adjustment structure 1000 provided in an embodiment of the present invention. Figure 2 The gear shaft clearance adjustment structure 1000 in this embodiment includes a housing 100, a bevel gear shaft 200, a rack 300 and a spring 400. The bevel gear shaft 200 is installed on the housing 100 through a bearing 500; the rack 300 is located in the housing 100, and the rack 300 is meshed with the bevel gear shaft 200; the spring 400 is sleeved on the bevel gear shaft 200, and one end of the spring 400 abuts against the bearing 500, and the other end of the spring 400 abuts against the end face of the bevel gear shaft 200. The spring 400 can apply a certain preload force to the bevel gear shaft 200. When the bevel gear shaft 200 and the rack 300 wear and generate a gap, the spring 400 can eliminate the gap caused by the wear of the bevel gear shaft 200 and the rack 300 because it is retractable and has a certain elastic force. The rack 300 is driven by the power assist motor to move axially, and the rack 300 drives the bevel gear shaft 200 to rotate.

[0066] By sleeved the spring 400 on the bevel gear shaft 200 and adjusting it coaxially with the bevel gear shaft 200, the clearance caused by wear between the bevel gear shaft 200 and the rack 300 can be eliminated, and the clearance adjustment structure can be simplified, the number of parts of the clearance adjustment structure can be reduced, the cost can be reduced, the assembly process can be simplified, and the assembly efficiency can be improved.

[0067] Please continue reading Figure 2The bearing 500 in this embodiment includes a first bearing 510 and a second bearing 520, which are respectively installed at both ends of the bevel gear shaft 200; the first bearing 510 is arranged at one end of the bevel gear shaft 200 close to the rack 300; one end of the spring 400 abuts against the second bearing 520, and the other end of the spring 400 abuts against the end surface of the bevel gear shaft 200; the first bearing 510 is a sliding bearing 500, and the second bearing 520 is a deep groove ball bearing 500. The outer ring of the first bearing 510 is interference fit with the shaft hole of the housing 100, and the inner hole of the first bearing 510 is clearance fit with the outer ring of the bevel gear shaft 200. The second bearing 520 is interference fit with the shaft hole of the housing 100, and the second bearing 520 is clearance fit with the outer ring of the bevel gear shaft 200.

[0068] And the deep groove ball bearing 500 in this embodiment adopts a 4P bearing 500. The 4P bearing 500 refers to a deep groove ball bearing 500 with four seals. This design allows the grease inside the bearing 500 to be better protected, reduces the invasion of external impurities and dust, and thus extends the service life of the bearing 500. In addition, the 4P bearing 500 has high rotation accuracy and stability, and can adapt to higher rotation speeds and larger radial loads. The 4P bearing 500 can withstand radial loads and certain axial loads, and has good sealing performance and a longer service life. Of course, the first bearing 510 and the second bearing 520 can also be designed as other bearings 500, as long as they can meet the assembly conditions of the bevel gear shaft 200, and are not limited here.

[0069] See also Figure 2 The housing 100 in this embodiment includes a first housing 110 and a second housing 120, the first housing 110 and the second housing 120 are connected, and the first housing 110 and the second housing 120 are enclosed together to form a mounting cavity, and an axial hole is provided in the mounting cavity. The bevel gear shaft 200 is installed in the axial hole through a first bearing 510 and a second bearing 520. In this embodiment, the first housing 110 and the second housing 120 are connected by threaded fasteners such as bolts 900. Of course, the first housing 110 and the second housing 120 can also be connected by welding, plugging, clamping, etc., which are not limited here. In order to eliminate the meshing clearance between the bevel gear shaft and the rack 300, the first bearing 510 and the second bearing 520 are both interference fit with the axial hole and clearance fit with the bevel gear shaft 200. And in order to ensure the sealing performance of the housing 100, a sealing ring 800 is provided at the connection between the first housing 110 and the second housing 120. The sealing ring 800 in this embodiment is an O-ring. Of course, the sealing ring 800 can also be a sealing ring 800 of other structural forms, which is not limited here. In addition, the housing 100 can also be integrally formed, which is not limited here.

[0070] Please continue reading Figure 2In order to facilitate the adjustment of the wheel axle clearance, the structure further includes a sensor 600, which is arranged on the bevel gear shaft 200 and is used to detect the rotation angle of the bevel gear shaft 200. The sensor 600 includes a rotor 700 and a sensor 600 body, the rotor 700 and the sensor 600 body are connected, and the rotor 700 and the sensor 600 body are fixed on the bevel gear shaft 200 by welding or riveting, and rotate with the bevel gear shaft 200 to detect the rotation angle of the bevel gear shaft 200. According to the rotation angle, feedback can be given to the control unit to control the axial displacement of the rack 300, forming a closed-loop control to improve the control accuracy.

[0071] The gear shaft clearance adjustment structure 1000 in this embodiment can be obtained by adopting the above-mentioned bevel gear clearance adjustment method.

[0072] In summary, the bevel gear clearance adjustment method includes the following steps: obtaining the parameters of the bevel gear shaft 200; calculating the value range of the displacement coefficient according to the parameters of the bevel gear shaft 200; calculating the angle between the bevel gear shaft 200 and the axis according to the maximum and minimum values ​​of the displacement coefficient; obtaining the production tolerance; calculating the axial displacement range of the bevel gear shaft 200 according to the production tolerance and the angle; calculating the parameters of the spring 400 according to the axial displacement range. The spring 400 is set and the bevel gear shaft 200, the bearing 500 and the rack 300 are installed; the bevel gear shaft 200 is meshed with the rack 300, and the bearing 500 is sleeved on the bevel gear shaft 200; one end of the spring 400 is against the bearing 500, and the other end of the spring 400 is against the end face of the bevel gear shaft 200. The bevel gear clearance adjustment method can determine the parameters of the spring 400 for adjusting the clearance according to the bevel gear shaft 200 of different specifications, so as to eliminate the clearance caused by the wear of the bevel gear shaft 200 and the rack 300, so as to improve the steering accuracy, enhance the steering stability and safety, and has universality. By setting the position of the spring 400 and the bevel gear shaft 200 as described above, the number of parts of the clearance adjustment structure can be reduced, the cost can be reduced, and the assembly efficiency can be improved.

[0073] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A bevel gear clearance adjustment method, characterized in that: The following steps are involved: Get the parameters of the bevel gear shaft (200); Calculating a value range of the displacement coefficient according to the parameters of the bevel gear shaft (200); Calculating the angle between the bevel gear shaft (200) and the axis according to the maximum and minimum values ​​of the modification coefficient; Get production tolerances; Calculating the axial displacement range of the bevel gear shaft (200) according to the production tolerance and the included angle; Calculating the parameters of the spring (400) according to the axial displacement range; The spring (400) is provided and the bevel gear shaft (200), the bearing (500) and the rack (300) are installed; the bevel gear shaft (200) is meshed with the rack (300), and the bearing (500) is sleeved on the bevel gear shaft (200); one end of the spring (400) is against the bearing (500), and the other end of the spring (400) is against the end surface of the bevel gear shaft (200).

2. The bevel gear clearance adjustment method according to claim 1, characterized in that: The obtaining of the production tolerance includes obtaining the radial clearance tolerance of each component after dispersion and accumulation.

3. The bevel gear clearance adjustment method according to claim 2, characterized in that: Calculating the axial displacement range of the bevel gear shaft (200) according to the production tolerance and the included angle comprises: The axial displacement is calculated according to the formula: axial displacement = radial clearance tolerance / tan angle; and the axial displacement range of the bevel gear shaft (200) is obtained according to the obtained axial displacement.

4. The bevel gear clearance adjustment method according to any one of claims 1 to 3, characterized in that: Calculating the parameters of the spring (400) according to the axial displacement range includes: When the axial displacement is the maximum value in the reverse direction, the preload force of the spring (400) must be greater than the torque of the motor driving the bevel gear shaft (200) to rotate; when the axial displacement is the maximum value in the forward direction, the stress generated by the spring (400) must be less than the maximum stress allowed by the device, so as to calculate the parameters of the spring (400).

5. The bevel gear clearance adjustment method according to claim 1, characterized in that: The obtaining of the parameters of the bevel gear shaft (200) comprises obtaining the number of teeth, pressure angle, module and width of the bevel gear.

6. A gear shaft clearance adjustment structure, characterized in that: include: Housing (100); A bevel gear shaft (200), wherein the bevel gear shaft (200) is mounted on the housing (100) via a bearing (500); a rack (300), the rack (300) being located in the housing (100), and the rack (300) being meshed with the bevel gear shaft (200); A spring (400) is sleeved on the bevel gear shaft (200), and one end of the spring (400) abuts against the bearing (500), and the other end of the spring (400) abuts against the end surface of the bevel gear shaft (200).

7. The gear shaft clearance adjustment structure according to claim 6, characterized in that: The gear shaft clearance adjustment structure (1000) further comprises a sensor (600), wherein the sensor (600) is arranged on the bevel gear shaft (200), and the sensor (600) is used to detect the rotation angle of the bevel gear shaft (200).

8. The gear shaft clearance adjustment structure according to claim 6 or 7, characterized in that: The bearing (500) comprises a first bearing (510) and a second bearing (520), wherein the first bearing (510) and the second bearing (520) are respectively mounted on two ends of the bevel gear shaft (200); the first bearing (510) is arranged at one end of the bevel gear shaft (200) close to the rack (300); one end of the spring (400) abuts against the second bearing (520), and the other end of the spring (400) abuts against the end surface of the bevel gear shaft (200); the first bearing (510) is a sliding bearing (500), and the second bearing (520) is a deep groove ball bearing (500).

9. A steering gear, characterized in that: It comprises the gear shaft clearance adjustment structure (1000) as described in any one of claims 6 to 8.

10. A vehicle, characterized in that: The invention comprises a vehicle body and the steering gear according to claim 9, wherein the steering gear is arranged in the vehicle body.

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