Radial rigidity testing tool for input shaft of steering engine

Abstract

The utility model relates to the technical field of steering systems, in particular to a radial rigidity testing tool for an input shaft of a steering engine. A radial rigidity testing tool for an input shaft of a steering engine comprises a base, an up-down moving mechanism, a force applying mechanism and a sensor connector, and is characterized in that the up-down moving mechanism is connected to the base, the force applying mechanism is connected to the front side of the up-down moving mechanism, and one side of the force applying mechanism is connected with the sensor connector; the base comprises a fixed bottom plate, a mechanism connecting plate and a reinforcing plate, the fixed bottom plate is connected with the mechanism connecting plate, and the reinforcing plate is connected between the fixed bottom plate and the mechanism connecting plate. Compared with the prior art, speed reduction and torque increase are achieved through a worm and gear structure, displacement and force of the force application rod can be better controlled, and excessive force application is avoided; a ball screw structure is adopted in the middle force application structure, a guide key and a key groove are additionally arranged outside the shell, and the key groove guarantees that rotation around the axis direction is limited when the force application rod moves left and right.

Description

Technical Field

[0001] The utility model relates to the technical field of steering systems, and specifically relates to a radial stiffness test tooling for a steering gear input shaft. Background Art

[0002] The upper end of the input shaft of an electric power steering gear is connected to a needle roller bearing, the gear end is connected to a pressing block and a rack, and the lower end is locked with a locking bolt, which will generate axial clearance and radial clearance. The existence of the clearance will affect the feel of the steering gear and may also cause noise problems. Therefore, in the design of all steering gears, there are standard requirements for the clearance of the input shaft, and the clearance of the input shaft of the steering gear is characterized by stiffness measurement. The clearance of the input shaft is very small. The specification requirements are basically that when a force is applied between ±1 kN, the clearance change is between 0.1 mm and 1 mm. Therefore, the accuracy requirements for the tooling for measuring the input shaft of the steering gear are extremely high. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a radial stiffness test tooling for a steering gear input shaft, which uses a worm and worm gear structure to realize speed reduction and torque increase, can better control the displacement and force of the force application rod, and avoid excessive force application.

[0004] To achieve the above object, a radial stiffness test tooling for a steering gear input shaft is designed, including a base, a vertical movement mechanism, a force application mechanism, and a sensor connector. It is characterized in that: the base is connected with the vertical movement mechanism, the force application mechanism is connected to the front side of the vertical movement mechanism, and one side of the force application mechanism is connected to the sensor connector;

[0005] The base includes a fixed bottom plate, a mechanism connection plate, and a reinforcing plate. The mechanism connection plate is connected to the fixed bottom plate, and the reinforcing plate is connected between the fixed bottom plate and the mechanism connection plate;

[0006] The vertical movement mechanism includes an up and down adjustment rotary handwheel, an up and down movement ball screw assembly, an up and down movement module, and a guide rail. Guide rails are respectively connected to both sides of the front part of the mechanism connection plate. An up and down adjustment rotary handwheel is arranged on the upper part of the mechanism connection plate. The lower end of the up and down adjustment rotary handwheel is connected to the up and down movement ball screw assembly. A lead screw nut of the up and down movement ball screw assembly is sleeved with an up and down movement module. Both sides of the bottom of the up and down movement module are respectively connected to the guide rail by slider assemblies;

[0007] The described force application mechanism includes a left - right adjustment rotary handwheel, a left - right moving ball screw assembly, a left - right moving module, and a force application rod. The left - right adjustment rotary handwheel is provided on one side below the up - down adjustment rotary handwheel. The bottom of the left - right adjustment rotary handwheel is connected to the left - right moving ball screw assembly by a worm and worm gear assembly. A left - right moving module is sleeved on the screw nut of the left - right moving ball screw assembly. The bottom of the left - right moving module is connected to the top of the up - down moving module. One side of the left - right moving module is connected to one end of the force application rod, and the other end of the force application rod is connected to a sensor connector.

[0008] The described fixed bottom plate is of a rectangular structure, and elongated holes with adjustable positions are provided on the fixed bottom plate.

[0009] The bottom of the described left - right adjustment rotary handwheel is connected to a worm, and one side of the worm is meshed and connected to a worm gear. The worm gear is connected to the screw of the left - right moving ball screw assembly.

[0010] The force application rod is provided with guide keys, and the guide keys are embedded in the key grooves of the force application rod.

[0011] The described sensor connector is a force sensor connector, and the sensor connector is a disk - shaped structure with a cylindrical protrusion connected in the middle.

[0012] One end of the described force application rod is connected to one side of the left - right moving module by a flange.

[0013] Compared with the prior art, the present utility model provides a radial stiffness test tooling for the input shaft of a steering gear. The use of a worm and worm gear structure realizes speed reduction and torque increase, which can better control the displacement and force of the force application rod and avoid excessive force application; the middle force application structure adopts a ball screw structure, and a guide key and a key groove are added outside the housing. The key groove ensures that when the force application rod moves left and right, the rotation around the axis direction is restricted; the middle force application mechanism is fixed by a screw structure, and the up - down position of the middle force application structure can be quickly adjusted by the up - down adjustment rotary handwheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the present utility model.

[0015] Figure 2 It is a schematic diagram of the force application mechanism in the present utility model.

[0016] Figure 3 It is a schematic diagram of the cooperation between the rotary handwheel and the ball screw structure.

[0017] Figure 4 It is a schematic diagram of the structure of the sensor connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the present utility model with reference to the drawings.

[0019] As Figures 1 to 4 shown, a vertical movement mechanism is connected to the base, a force application mechanism is connected to the front side of the vertical movement mechanism, and a sensor connector is connected to one side of the force application mechanism;

[0020] The base includes a fixed bottom plate, a mechanism connection plate, and a reinforcing plate. The mechanism connection plate 2 is connected to the fixed bottom plate 7, and the reinforcing plate 6 is connected between the fixed bottom plate 7 and the mechanism connection plate 2;

[0021] The vertical movement mechanism includes a vertical adjustment rotary handwheel, a vertical movement ball screw assembly, a vertical movement module, and guide rails. Guide rails 9 are respectively connected to both sides of the front part of the mechanism connection plate 2. A vertical adjustment rotary handwheel 1 is provided at the upper part of the mechanism connection plate 2. The lower end of the vertical adjustment rotary handwheel 1 is connected to the vertical movement ball screw assembly 8. A vertical movement module 12 is sleeved on the screw nut of the vertical movement ball screw assembly 8. Both sides of the bottom of the vertical movement module 12 are respectively connected to the guide rails 9 by slider assemblies;

[0022] The force application mechanism includes a left - right adjustment rotary handwheel, a left - right movement ball screw assembly, a left - right movement module, and a force application rod. A left - right adjustment rotary handwheel 11 is provided on one side below the vertical adjustment rotary handwheel 1. The bottom of the left - right adjustment rotary handwheel 11 is connected to the left - right movement ball screw assembly 10 by a worm and gear assembly. A left - right movement module 13 is sleeved on the screw nut of the left - right movement ball screw assembly 10. The bottom of the left - right movement module 13 is connected to the top of the vertical movement module 12. One side of the left - right movement module 13 is connected to one end of the force application rod 5, and the other end of the force application rod 5 is connected to the sensor connector 4.

[0023] The fixed bottom plate 7 is of a rectangular structure, and an adjustable waist - shaped hole 14 is provided on the fixed bottom plate 7.

[0024] The bottom of the left - right adjustment rotary handwheel 11 is connected to a worm 15, one side of the worm 15 is meshed and connected to a turbine 16, and the turbine 16 is connected to the screw of the left - right movement ball screw assembly 10.

[0025] A guide key 3 is provided on the force application rod 5, and the guide key 3 is embedded in the keyway of the force application rod 5.

[0026] The sensor connector 4 is a force sensor connector, and the sensor connector 4 is a disc - shaped structure with a cylindrical convex structure connected in the middle.

[0027] One end of the force application rod 5 is connected to one side of the left - right movement module 13 by a flange.

[0028] The specific implementation manner of the present utility model:

[0029] 1. Connect the fixed bottom plate 7 and the cast iron platform by bolts;

[0030] 2. Adjust the force application mechanism to a suitable position by rotating the up-and-down adjustment handwheel 1 to match the position of the corresponding test sample.

[0031] 3. Connect the force sensor connector 4 to the force sensor and the corresponding displacement sensor.

[0032] 4. Move the force application mechanism left and right by rotating the left-and-right adjustment handwheel 11 to achieve precise stiffness measurement.

[0033] The up-and-down quick height adjustment is achieved by moving the screw nut of the ball screw assembly 8 up and down. By rotating the up-and-down adjustment handwheel 1, the up-and-down movement of the force application rod 5 is realized, which facilitates quickly matching the height of the object to be measured. A smaller lead is selected for the screw to ensure that the force application rod 5 does not slide down due to its own weight.

[0034] By rotating the left-and-right adjustment handwheel 11, the worm 15 drives the turbine 16 to rotate. As the balls in the turbine 16 rotate, they push the force application rod 5 to move left and right. A guiding key 3 is provided outside the box body to guide the axial movement of the force application rod 5 and at the same time inhibit the rotation of the force application rod, so that the object to be measured can only receive the tensile or compressive force along the rod, reducing the influence of torque on the object to be measured. The front end of the force application rod 5 is connected to the displacement sensor through the force sensor connector 4. By rotating the left-and-right adjustment handwheel 11, the stiffness curve of the sample is measured.

[0035] With the tooling of the present utility model, the left-and-right adjustment handwheel can be used. Through the speed reduction and torque increase of the worm and gear reduction mechanism, the force application rod is driven to move back and forth. Since the actual displacement change of the object to be measured is very small, using a large reduction ratio of the worm and gear, the small stroke output at the turbine end is amplified to the large stroke input at the worm end, which can achieve higher-precision force control. At the same time, using the self-locking function of the worm and gear, during the test, the force sensing connecting rod will not move back due to the reaction force of the object to be measured, thus affecting the test result.

[0036] The advantages of the present utility model are as follows:

[0037] 1. Using the worm and gear structure to achieve speed reduction and torque increase can better control the displacement and force of the force application rod and avoid excessive force application.

[0038] 2. The middle force application structure adopts a ball screw structure, and a guiding key and keyway are added outside the housing. The keyway ensures that the rotation of the force application rod around the axis direction is restricted when it moves left and right.

[0039] 3. By fixing the middle force application mechanism through the screw structure, the up-and-down position of the middle force application structure can be quickly adjusted by rotating the up-and-down adjustment handwheel.

Claims

1. A radial stiffness test fixture for a steering gear input shaft, comprising a base, an up and down moving mechanism, a force applying mechanism, and a sensor joint, characterized in that: The base is connected to an up-and-down moving mechanism, the front side of the up-and-down moving mechanism is connected to a force applying mechanism, and one side of the force applying mechanism is connected to a sensor connector; The base comprises a fixed base plate, a mechanism connecting plate and a reinforcing plate; the fixed base plate (7) is connected to the mechanism connecting plate (2); and the reinforcing plate (6) is connected between the fixed base plate (7) and the mechanism connecting plate (2); The up-and-down moving mechanism comprises an up-and-down adjusting rotating hand wheel, an up-and-down moving ball screw assembly, an up-and-down moving module, and a guide rail. The two sides of the front part of the mechanism connecting plate (2) are respectively connected to the guide rails (9). The upper part of the mechanism connecting plate (2) is provided with an up-and-down adjusting rotating hand wheel (1). The lower end of the up-and-down adjusting rotating hand wheel (1) is connected to the up-and-down moving ball screw assembly (8). The screw nut of the up-and-down moving ball screw assembly (8) is sleeved with an up-and-down moving module (12). The two sides of the bottom of the up-and-down moving module (12) are respectively connected to the guide rails (9) by using slider assemblies. The force applying mechanism comprises a left-right adjusting rotating hand wheel, a left-right movable ball screw assembly, a left-right movable module, and a force applying rod. A left-right adjusting rotating hand wheel (11) is provided on one side below the up-down adjusting rotating hand wheel (1). The bottom of the left-right adjusting rotating hand wheel (11) is connected to the left-right movable ball screw assembly (10) by a worm gear assembly. A left-right movable module (13) is sleeved on the screw nut of the left-right movable ball screw assembly (10). The bottom of the left-right movable module (13) is connected to the top of the up-down movable module (12). One side of the left-right movable module (13) is connected to one end of the force applying rod (5), and the other end of the force applying rod (5) is connected to the sensor connector (4).

2. The radial stiffness testing tool for a steering gear input shaft according to claim 1, characterized in that: The fixed bottom plate (7) is a rectangular structure, and a waist-shaped hole (14) with an adjustable position is provided on the fixed bottom plate (7).

3. The radial stiffness testing tool for a steering gear input shaft according to claim 1, characterized in that: The bottom of the left-right adjusting rotating hand wheel (11) is connected to a worm (15), one side of the worm (15) is meshedly connected to a turbine (16), and the turbine (16) is connected to a lead screw of a left-right moving ball screw assembly (10).

4. The radial stiffness testing tool for a steering gear input shaft according to claim 1, characterized in that: The force application rod (5) is provided with a guide key (3), and the guide key (3) is embedded in a keyway of the force application rod (5).

5. The radial stiffness testing tool for a steering gear input shaft according to claim 1, characterized in that: The sensor joint (4) is a force sensor joint, and the sensor joint (4) is a disc-shaped structure with a cylindrical protrusion structure connected in the middle.

6. The radial stiffness testing tool for a steering gear input shaft according to claim 1, characterized in that: One end of the force application rod (5) is connected to one side of the left-right movable module (13) by means of a flange.

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