Steel ball clearance detection device for steering engine ball screw

Abstract

The utility model relates to the technical field of brake systems, in particular to a steel ball clearance detection device for a ball screw of a steering engine. A steel ball clearance detection device for a steering engine ball screw comprises a rack and is characterized in that the middle of the top of the rack is connected with a rack clearance measuring mechanism, and a rack nut radial positioning mechanism is arranged on one side of the rack clearance measuring mechanism; the left end and the right end of the top of the rack are connected with the rack synchronizing mechanism and the rack axial positioning mechanism through sliding block assemblies correspondingly. Compared with the prior art, the steel ball clearance detection device for the steering engine ball screw is simple in structure and convenient and rapid to operate, the steel ball clearance value of the rack can be measured by applying 50N force to the rack through a mechanical part, and the measurement precision meets the requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of brake systems, in particular to a steel ball clearance detection device for a ball screw of a steering machine. Background Art

[0002] Traditional steering gears are mainly divided into two types of transmission structures, one is the gear rack transmission method, and the other is the belt transmission method. For steering gears with belt transmission methods, the ball clearance value has a great influence on the performance of the steering gear. However, due to the production line rhythm, ordinary manual ball clearance testing cannot meet the production line rhythm requirements (the production line rhythm requirement is 80s, but the normal frequency debugging method takes about 40 minutes), and manual testing usually has different evaluation criteria.

[0003] Therefore, it is very important to design a reliable and high-speed automatic testing method for ball clearance. Summary of the invention

[0004] The utility model overcomes the shortcomings of the prior art and provides a steel ball clearance detection device for a steering gear ball screw. The steel ball clearance value of the rack can be measured by applying a force of 50N to the rack using a mechanical component.

[0005] To achieve the above purpose, a ball clearance detection device for a steering gear ball screw is designed, including a frame, characterized in that: a rack clearance measuring mechanism is connected to the middle of the top of the frame, and a rack nut radial positioning mechanism is provided on one side of the rack clearance measuring mechanism; the left and right ends at the top of the frame are respectively connected to the rack synchronization mechanism and the rack axial positioning mechanism through a slider assembly.

[0006] The rack synchronization mechanism includes a rack synchronization mechanism base plate, a lifting motor, a code reader, a first clamping cylinder, a rack base, and a first clamping claw. The bottom of the rack synchronization mechanism base plate is connected to the driving shaft of the lifting motor, and the top of the rack synchronization mechanism base plate is connected to the rack base. The first clamping claws are respectively provided on the left and right sides in front of the rack base, and the bottom of the first clamping claw is connected to the first clamping cylinder. The bottom of the first clamping cylinder is fixedly connected to the rack synchronization mechanism base plate; a code reader is provided on one side between the rack base and the first clamping claw.

[0007] The bottom of the lifting motor is connected to the frame.

[0008] The code reader is fixedly connected to the bottom plate of the rack synchronization mechanism via a connecting piece.

[0009] The rack clearance measuring mechanism comprises a rack clearance measuring mechanism base plate, a driving motor, a thrust cylinder, a test head, a displacement sensor, a U-shaped driving head, a force sensor, and a guide rail. The rack clearance measuring mechanism base plate is in a U-shaped structure. The bottom of the rack clearance measuring mechanism base plate is fixedly connected to a frame. The rack clearance measuring mechanism base plate is connected to the driving motor via a guide rail. The top of the driving motor is connected to the U-shaped driving head via a connecting bracket. A test head is provided on one side of the U-shaped driving head. The bottom of the test head is connected to the thrust cylinder, and one side of the test head is connected to the displacement sensor.

[0010] The force sensor is connected to the other side of the U-shaped drive head.

[0011] The rack nut radial positioning mechanism includes a rack nut radial positioning mechanism base, a second clamping cylinder, and a second clamping jaw. The bottom of the rack nut radial positioning mechanism base is fixedly connected to the frame, one end of the second clamping cylinder is connected to the rack nut radial positioning mechanism base, and the other end of the second clamping cylinder is connected to two second clamping jaws.

[0012] The rack axial positioning mechanism includes a rack axial positioning mechanism base, a nut positioning block, a connector, a third clamping cylinder, a cylinder connecting seat, and a damper. The bottom of the rack axial positioning mechanism base is connected to the frame through a slider assembly, the upper front side of the rack axial positioning mechanism base is connected to the nut positioning block, the lower rear side of the rack axial positioning mechanism base is connected to one end of the connector, and the other end of the connector is connected to the driving shaft of the third clamping cylinder; the third clamping cylinder is fixedly connected to the frame using a cylinder connecting seat.

[0013] The nut positioning pressing block is an annular structure.

[0014] A damper is arranged on the frame located at one side of the base of the rack axial positioning mechanism.

[0015] Compared with the prior art, the utility model provides a steel ball clearance detection device for a steering gear ball screw, which has a simple structure and is easy and quick to operate. The rack steel ball clearance value can be measured by applying a force of 50N to the rack using mechanical components, and the measurement accuracy meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the structure of the rack synchronization mechanism in the utility model.

[0018] Figure 3 Schematic diagram of the working state of the rack synchronization mechanism.

[0019] Figure 4 It is a schematic diagram of the structure of the rack clearance measuring mechanism in the utility model.

[0020] Figure 5 Schematic diagram of the working status of the rack clearance measuring mechanism.

[0021] Figure 6 It is a schematic diagram of the structure of the radial positioning mechanism of the rack nut in the utility model.

[0022] Figure 7 This is a schematic diagram of the working status of the rack nut radial positioning mechanism.

[0023] Figure 8 It is a schematic diagram of the structure of the rack axial positioning mechanism in the utility model.

[0024] Fig. 9 Schematic diagram of the rack force condition. DETAILED DESCRIPTION

[0025] The utility model is further described below with reference to the accompanying drawings.

[0026] like Figures 1 to 8 As shown, a rack gap measuring mechanism 3 is connected to the middle of the top of the frame 1, and a rack nut radial positioning mechanism 4 is provided on one side of the rack gap measuring mechanism 3; the left and right ends at the top of the frame 1 are respectively connected to the rack synchronization mechanism 2 and the rack axial positioning mechanism 5 through slider assemblies.

[0027] like Figure 2 , Figure 3 As shown, the rack synchronization mechanism 2 includes a rack synchronization mechanism base plate, a lifting motor, a code reader, a first clamping cylinder, a rack base, and a first clamping claw. The bottom of the rack synchronization mechanism base plate 2-1 is connected to the driving shaft of the lifting motor 2-2, and the top of the rack synchronization mechanism base plate 2-1 is connected to the rack base 2-5. First clamping claws 2-6 are respectively provided on the left and right sides in front of the rack base 2-5. The bottom of the first clamping claw 2-6 is connected to the first clamping cylinder 2-4, and the bottom of the first clamping cylinder 2-4 is fixedly connected to the rack synchronization mechanism base plate 2-1; a code reader 2-3 is provided on one side between the rack base 2-5 and the first clamping claw 2-6.

[0028] The bottom of the lifting motor 2 - 2 is connected to the frame 1 .

[0029] The code reader 2-3 is fixedly connected to the rack synchronization mechanism base plate 2-1 through a connecting piece.

[0030] At the beginning of the test process, one end of the rack to be tested is placed on the rack base 2-5; the first clamping jaw 2-6 clamps the rack to be tested through the first clamping cylinder 2-4 to ensure that the swing direction of the tooth surface of the rack to be tested is consistent before each measurement starts; the code reader 2-3 is used to identify the QR code information of the rack to be tested and bind the processing data of the rack to be tested; in order to ensure that the applied force on the U-shaped drive head 3-6 of the rack clearance measuring mechanism 3 acts completely on the rack to be tested, the rack to be tested must be able to detach from the rack base 2-5 and perform the clearance test in a suspended state. The lifting motor 2-2 needs to descend synchronously when the test force requirement is not met, and rise synchronously after the test is completed.

[0031] like Figure 4 , Figure 5 As shown, the rack clearance measuring mechanism 3 includes a rack clearance measuring mechanism base plate, a driving motor, a thrust cylinder, a test head, a displacement sensor, a U-shaped driving head, a force sensor, and a guide rail. The rack clearance measuring mechanism base plate 3-1 is a U-shaped structure. The bottom of the rack clearance measuring mechanism base plate 3-1 is fixedly connected to the frame 1. The rack clearance measuring mechanism base plate 3-1 is connected to the driving motor 3-2 through a guide rail 3-8. The top of the driving motor 3-2 is connected to the U-shaped driving head 3-6 by a connecting bracket 3-9. A test head 3-4 is provided on one side of the U-shaped driving head 3-6. The bottom of the test head 3-4 is connected to the thrust cylinder 3-3, and one side of the test head 3-4 is connected to the displacement sensor 3-5.

[0032] The force sensor 3-7 is connected to the other side of the U-shaped driving head 3-6.

[0033] Drive motor 3-2 in the measurement direction (F1, F2, see Fig. 9 The thrust for clearance measurement can be applied linearly and smoothly on the test head 3-4 to ensure that the output thrust can meet the requirement of 50N; the displacement sensor 3-5 adopts an extended-range length gauge for measurement, and its accuracy can reach ±0.5µm, and it has the advantage of high repeatability; the thrust cylinder 3-3 is connected to the test head 3-4, giving the test head 3-4 a small power to ensure that the test head 3-4 can always contact the rack under test during the swinging process; the test head 3-4 is made of aluminum material, directly contacts the rack under test, and feeds back the displacement change of the rack under test; the force sensor 3-7 feeds back the pressure change on the rack under test during the movement of the drive motor 3-2; the U-shaped drive head 3-6 directly contacts the rack under test, separates the rack under test from the steel ball, and feeds back the maximum gap value; the guide rail 3-8 ensures the consistency of the force direction during the movement of the drive motor 3-2.

[0034] like Figure 6 , Figure 7As shown, the rack nut radial positioning mechanism 4 includes a rack nut radial positioning mechanism base, a second clamping cylinder, and a second clamping jaw. The bottom of the rack nut radial positioning mechanism base 4-1 is fixedly connected to the frame 1, and one end of the second clamping cylinder 4-2 is connected to the rack nut radial positioning mechanism base 4-1, and the other end of the second clamping cylinder 4-2 is connected to two second clamping jaws 4-3.

[0035] like Figure 8 As shown, the rack axial positioning mechanism 5 includes a rack axial positioning mechanism base, a nut positioning block, a connector, a third clamping cylinder, a cylinder connecting seat, and a damper. The bottom of the rack axial positioning mechanism base 5-2 is connected to the frame 1 through a slider assembly, the upper front side of the rack axial positioning mechanism base 5-2 is connected to the nut positioning block 5-1, the lower rear side of the rack axial positioning mechanism base 5-2 is connected to one end of the connector 5-5, and the other end of the connector 5-5 is connected to the driving shaft of the third clamping cylinder 5-4; the third clamping cylinder 5-4 is fixedly connected to the frame 1 using the cylinder connecting seat 5-3.

[0036] The nut positioning block 5-1 is an annular structure.

[0037] A damper 5-6 is provided on the frame 1 located on one side of the rack axial positioning mechanism base 5-2.

[0038] The third clamping cylinder 5-4 is used to provide downward pressure to limit the measured rack in the axial direction; the connector 5-5 is used to connect the third clamping cylinder 5-4 and the rack axial positioning mechanism base 5-2; the damper 5-6 plays a buffering role; the nut positioning block 5-1 is a contoured tooling for the measured rack and plays a positioning role.

[0039] The working principle of the utility model is as follows: when the workpiece (i.e. the rack with the steering nut to be tested) enters the workstation, the motor 5-4 of the rack axial positioning mechanism 5 pushes the nut positioning block 5-1 to press the steering nut on the tested rack, so that the rack as a whole cannot move up and down; secondly, the steering nut is clamped by the rack nut radial positioning mechanism 4, so that the steering nut cannot swing left and right in the clearance test direction; the thrust cylinder 3-3 of the rack clearance measuring mechanism 3 drives the test head 3-4 to extend and hold the rack, and the driving motor 3-2 drives the U-shaped driving head 3-6 to move in the direction of the tested rack F1 (such as Fig. 9 As shown in the figure, when the value on the force sensor 3-7 is collected to be 25N, the rack synchronization mechanism 2 descends through the lifting motor 2-2, so that the measured rack descends and disengages from the rack base 2-5, and the measured rack continues to move downward. When the value of the monitoring force sensor 3-7 is 50N, the value X1 of the displacement sensor 3-5 is recorded.

[0040] In the same case, the U-shaped drive head 3-6 moves in the F2 direction (such as Fig. 9As shown in the figure, the rack synchronization mechanism 2 rises through the lifting motor 2-2 to catch the descending rack under test. The rack under test continues to move in the direction of F2. When the value on the force sensor 3-7 is collected as -25N, the lifting motor 2-2 of the rack synchronization mechanism 2 continues to rise. When the value of the force sensor 3-7 is -50N, the value X2 of the displacement sensor 3-5 is recorded. After the displacement sensor 3-5 obtains the difference (i.e. |X2-X1|), the test ends and the mechanism returns to the origin.

[0041] The utility model has a simple structure and is easy and quick to operate. It uses mechanical parts to apply a force of 50N to the rack to measure the rack steel ball clearance value, and the measurement accuracy meets the requirements.

Claims

1. A steel ball clearance detection device for a steering gear ball screw, comprising a frame, characterized in that: A rack clearance measuring mechanism (3) is connected to the middle of the top of the frame (1), and a rack nut radial positioning mechanism (4) is provided on one side of the rack clearance measuring mechanism (3); the left and right ends of the top of the frame (1) are respectively connected to the rack synchronization mechanism (2) and the rack axial positioning mechanism (5) through a slider assembly.

2. The steel ball clearance detection device for a steering gear ball screw according to claim 1, characterized in that: The rack synchronization mechanism (2) comprises a rack synchronization mechanism bottom plate, a lifting motor, a code reader, a first clamping cylinder, a rack base, and a first clamping claw. The bottom of the rack synchronization mechanism bottom plate (2-1) is connected to the drive shaft of the lifting motor (2-2), the top of the rack synchronization mechanism bottom plate (2-1) is connected to the rack base (2-5), and first clamping claws (2-6) are respectively arranged on the left and right sides in front of the rack base (2-5), the bottom of the first clamping claw (2-6) is connected to the first clamping cylinder (2-4), and the bottom of the first clamping cylinder (2-4) is fixedly connected to the rack synchronization mechanism bottom plate (2-1); and a code reader (2-3) is arranged on one side between the rack base (2-5) and the first clamping claw (2-6).

3. The steel ball clearance detection device for a steering gear ball screw according to claim 2, characterized in that: The bottom of the lifting motor (2-2) is connected to the frame (1).

4. The steel ball clearance detection device for a steering gear ball screw according to claim 2, characterized in that: The code reader (2-3) is fixedly connected to the rack synchronization mechanism bottom plate (2-1) via a connecting piece.

5. The steel ball clearance detection device for a steering gear ball screw according to claim 1, characterized in that: The rack clearance measuring mechanism (3) comprises a rack clearance measuring mechanism bottom plate, a driving motor, a thrust cylinder, a test head, a displacement sensor, a U-shaped driving head, a force sensor, and a guide rail. The rack clearance measuring mechanism bottom plate (3-1) is in a U-shaped structure. The bottom of the rack clearance measuring mechanism bottom plate (3-1) is fixedly connected to a frame (1). The rack clearance measuring mechanism bottom plate (3-1) is connected to the driving motor (3-2) via a guide rail (3-8). The top of the driving motor (3-2) is connected to the U-shaped driving head (3-6) via a connecting bracket (3-9). A test head (3-4) is provided on one side of the U-shaped driving head (3-6). The bottom of the test head (3-4) is connected to the thrust cylinder (3-3). One side of the test head (3-4) is connected to the displacement sensor (3-5).

6. The steel ball clearance detection device for a steering gear ball screw according to claim 5, characterized in that: The force sensor (3-7) is connected to the other side of the U-shaped driving head (3-6).

7. The steel ball clearance detection device for a steering gear ball screw according to claim 1, characterized in that: The rack nut radial positioning mechanism (4) comprises a rack nut radial positioning mechanism base, a second clamping cylinder, and a second clamping claw. The bottom of the rack nut radial positioning mechanism base (4-1) is fixedly connected to the frame (1), one end of the second clamping cylinder (4-2) is connected to the rack nut radial positioning mechanism base (4-1), and the other end of the second clamping cylinder (4-2) is connected to two second clamping claws (4-3).

8. The steel ball clearance detection device for a steering gear ball screw according to claim 1, characterized in that: The rack axial positioning mechanism (5) comprises a rack axial positioning mechanism base, a nut positioning block, a connector, a third clamping cylinder, a cylinder connecting seat, and a damper. The bottom of the rack axial positioning mechanism base (5-2) is connected to the frame (1) via a slider assembly, the upper front side of the rack axial positioning mechanism base (5-2) is connected to the nut positioning block (5-1), the lower rear side of the rack axial positioning mechanism base (5-2) is connected to one end of the connector (5-5), and the other end of the connector (5-5) is connected to the drive shaft of the third clamping cylinder (5-4); the third clamping cylinder (5-4) is fixedly connected to the frame (1) using a cylinder connecting seat (5-3).

9. A steel ball clearance detection device for a steering gear ball screw according to claim 8, characterized in that: The nut positioning pressing block (5-1) is an annular structure.

10. The steel ball clearance detection device for a steering gear ball screw according to claim 1, characterized in that: A damper (5-6) is provided on the frame (1) located on one side of the rack axial positioning mechanism base (5-2).

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