A worm gear running-in device for automobile steering system

Abstract

The present invention discloses a worm gear running-in device for an automobile steering system, and relates to the technical field of worm gear running-in devices, including a device body, wherein the device body includes a left slide feeding mechanism, a positioning mechanism, a worm gear measurement and force-adding small slide, a right slide feeding mechanism, a detection mechanism, and a hydraulic system, wherein the positioning mechanism includes a housing, a hydraulic clamping mandrel, a rotating spindle, and a clamping oil cylinder, wherein the hydraulic clamping mandrel is fixed on the rotating spindle, and the hydraulic clamping mandrel is provided with an inner circle clamping structure, wherein the hydraulic clamping mandrel is clamped and installed with a worm gear through the inner circle clamping structure, and a push rod is connected between the output end of the clamping oil cylinder and the rotating spindle. The present invention improves the surface of the worm gear through the device body, and allows the worm gear to have certain textures on the surface after running-in, and has a certain function of storing grease, which can greatly reduce or eliminate abnormal noise, and improve the quality of the automobile steering gear.

Description

Technical Field

[0001] The invention relates to the technical field of worm gear running-in equipment, and in particular to a worm gear running-in equipment for an automobile steering system. Background Art

[0002] The automobile steering gear is also called the steering machine or the steering gear. It is the most important part of the automobile steering system. Its function is to increase the force transmitted from the steering wheel to the steering transmission mechanism and change the direction of force transmission.

[0003] At present, automobile steering gears need to be tested by special testing machines before leaving the factory to test the performance and some parameters of the automobile steering gears. The working principle is as follows: a special automobile steering gear testing machine is used to simulate the steering gear working under actual working conditions, and the testing machine detects various parameters of the steering gear in real time. Since the reduction worm gear in the steering gear is an injection molded part with a very smooth surface (without grease reserve function), the steering gear makes abnormal noises when working, resulting in the failure of the assembly.

[0004] As mentioned above, we have designed a worm gear running-in equipment for automobile steering system to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a worm gear running-in device for an automobile steering system.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A worm gear running-in device for a vehicle steering system comprises a device body, wherein the device body comprises a left slide feeding mechanism, a positioning mechanism, a worm measuring and boosting small slide, a right slide feeding mechanism, a detection mechanism and a hydraulic system.

[0008] The positioning mechanism includes a housing, a hydraulic clamping mandrel, a rotating spindle, and a clamping oil cylinder. The hydraulic clamping mandrel is fixed on the rotating spindle. The hydraulic clamping mandrel is provided with an inner circle clamping structure. The hydraulic clamping mandrel is clamped and installed with a worm gear through the inner circle clamping structure. A push rod is connected between the output end of the clamping oil cylinder and the rotating spindle. A disc spring is installed on the upper outer side of the push rod.

[0009] The detection mechanism includes a driving side and a braking side, and the driving side and the braking side are respectively installed on the right slide feed mechanism and the left slide feed mechanism, the driving side includes a servo motor, a torque sensor, a driving worm tool spindle, a quick tool change mechanism 1, and a tool automatic clamping mechanism 1; the braking side includes a tool automatic clamping mechanism 2, a quick tool change mechanism 2, a braking side tool worm, a servo motor for tool setting, an origin sensor, an encoder, a magnetic powder brake, an electromagnetic clutch, and a driving shaft; the worm tool spindle is directly driven and connected by a servo motor through a coupling, the torque sensor is arranged between the servo motor and the worm tool spindle, the other side of the driving worm tool spindle is installed with a quick tool change mechanism 1 and a tool automatic clamping mechanism 1 in sequence, the origin sensor and the encoder are installed on the driving shaft in sequence, the other side of the driving shaft is fixedly connected to the braking side tool worm, and the tool setting servo motor and the driving shaft are connected through a synchronous belt.

[0010] Preferably, the hydraulic clamping mandrel clamps the worm gear through a disc spring. When the hydraulic clamping mandrel releases the worm gear, the clamping cylinder drives the push rod to move upward in one direction through oil supply from the hydraulic system.

[0011] Preferably, positioning pins for fixing the left slide feed mechanism and the right slide feed mechanism are also installed on the equipment body.

[0012] Preferably, the positioning mechanism is installed between the driving side and the braking side, and is meshingly connected with the driving worm tool spindle and the braking side tool worm.

[0013] Preferably, the equipment body is further provided with a front-and-rear sliding structure connected to the positioning mechanism, and the front-and-rear sliding structure includes a driving cylinder.

[0014] Preferably, the magnetic powder brake is directly connected to the driving shaft on the braking side.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The hydraulic clamping mandrel 202 is provided with an inner circle clamping structure, and the hydraulic clamping mandrel 202 is clamped and installed with a worm gear 6 through the inner circle clamping structure. A push rod 205 is connected between the output end of the clamping oil cylinder 204 and the rotating main shaft 203. A disc spring 206 is installed on the upper outer side of the push rod 205, which can automatically clamp and limit the worm gear through the inner circle clamping structure when in use;

[0017] 2. Use magnetic powder brake on the braking side to apply damping to the worm gear, so that the worm gear has a certain resistance during the running-in process, achieving a more ideal running-in effect;

[0018] 3. By improving the surface of the worm gear, the surface of the worm gear will have certain textures added after running-in, and it has a certain function of storing grease, which can greatly reduce or eliminate abnormal noise and improve the quality of the car steering gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a worm gear running-in device for an automobile steering system proposed by the present invention;

[0020] Figure 2 This is an enlarged view of point A of a worm gear running-in device for an automobile steering system proposed by the present invention;

[0021] Figure 3 This is a structural schematic diagram of a positioning mechanism of a worm gear running-in device for a vehicle steering system proposed by the present invention;

[0022] Figure 4 A three-dimensional diagram of a positioning mechanism of a worm gear running-in device for an automobile steering system proposed by the present invention;

[0023] Figure 5 This is a schematic structural diagram of the driving side of a worm gear running-in device for a vehicle steering system proposed by the present invention;

[0024] Figure 6 This is a schematic structural diagram of the braking side of a worm gear running-in device for a vehicle steering system proposed by the present invention;

[0025] Figure 7 This is a structural schematic diagram of a right slide feeding mechanism of a worm gear running-in device for a vehicle steering system proposed by the present invention;

[0026] Figure 8 The present invention is a schematic structural diagram of an eddy current tube of a worm gear running-in device for a vehicle steering system.

[0027] In the figure: 1 equipment body, 2 left slide feeding mechanism, 201 housing, 202 hydraulic clamping mandrel, 203 rotating spindle, 204 clamping cylinder, 205 push rod, 206 disc spring, 3 positioning mechanism, 4 right slide feeding mechanism, 5 detection mechanism, 6 worm gear, 7 driving side, 701 servo motor, 702 torque sensor, 703 driving worm tool spindle, 704 quick tool changing mechanism 1, 705 tool automatic clamping mechanism 1, 8 braking side, 801 tool automatic clamping mechanism 2, 802 quick tool changing mechanism 2, 803 braking side tool worm, 804 tool setting servo motor, 805 origin sensor, 806 encoder, 807 magnetic powder brake, 808 electromagnetic clutch. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Embodiment 1

[0030] Reference Figure 1 A worm gear running-in device for a vehicle steering system comprises a device body 1, wherein the device body 1 comprises a left slide feeding mechanism 2, a positioning mechanism 3, a worm measuring force-adding small slide, a right slide feeding mechanism 4, a detection mechanism 5 and a hydraulic system; wherein the left slide feeding mechanism 2 and the right slide feeding mechanism 4 are both slidably mounted on the worm measuring force-adding small slide;

[0031] In this example, referring to 2-4, the positioning mechanism 3 includes a housing 201, a hydraulic clamping mandrel 202, a rotating spindle 203, and a clamping cylinder 204. The hydraulic clamping mandrel 202 is fixed on the rotating spindle 203. The hydraulic clamping mandrel 202 is provided with an inner circle clamping structure. The hydraulic clamping mandrel 202 is clamped and installed with a worm gear 6 through the inner circle clamping structure. A push rod 205 is connected between the output end of the clamping cylinder 204 and the rotating spindle 203. A disc spring 206 is installed on the upper outer side of the push rod 205; more specifically, the hydraulic clamping mandrel 202 clamps the worm gear 6 through the disc spring 206. When the hydraulic clamping mandrel 202 releases the worm gear 6, the clamping cylinder 204 drives the push rod 205 to move upward in one direction through the hydraulic system oil supply;

[0032] When in use, the worm wheel 6 is manually placed on the positioning mechanism 3, and the positioning mechanism 3 automatically positions and clamps the worm wheel 6. The teeth of the worm wheel 6 must always be kept consistent when placed. Through the positioning mechanism 3, when the worm wheel 6 is placed, the tooth direction of the worm wheel 6 can be ensured to be consistent each time. The worm wheel 6 is placed on a special hydraulic clamping mandrel 202 tooling, and the worm wheel 6 is positioned and clamped by the hydraulic system.

[0033] More specifically, the positioning mechanism 3 adopts an inner circle clamping (such as Figure 3 The hydraulic clamping mandrel 202 can automatically complete the loading of the workpiece. When the worm gear 6 is clamped, the inner circle clamping structure moves upward and indirectly drives the disc spring 206 to compress and apply force upward to clamp the worm gear 6. When releasing, the worm gear 6 is released by starting the hydraulic system. The clamping force is obtained by the hydraulic system of the machine tool. The hydraulic system supplies oil to the clamping cylinder 204, so that the clamping cylinder 204 drives the push rod 205 to move upward to release the hydraulic clamping mandrel 202. When the hydraulic system is not working, the disc spring 206 gives force to the clamping cylinder 204 to reset the clamping cylinder 204 and clamp the workpiece. The hydraulic clamping mandrel 202 is fixed on the rotating spindle 203. The rotating spindle 203 has a rotation function, so it can drive the hydraulic clamping mandrel 202 to rotate.

[0034] In this embodiment, refer to Figure 5-7 The detection mechanism 5 includes a driving side 7 and a braking side 8, and the driving side 7 and the braking side 8 are respectively installed on the right slide feeding mechanism 4 and the left slide feeding mechanism 2. The driving side 7 includes a servo motor 701, a torque sensor 702, a driving worm tool spindle 703, a quick tool changing mechanism 1 704, and a tool automatic clamping mechanism 1 705; the braking side 8 includes a tool automatic clamping mechanism 2 801, a quick tool changing mechanism 2 802, a braking side tool worm 803, a tool setting servo motor 804, an origin sensor 805, an encoder 806, a magnetic powder brake 807, an electromagnetic clutch 808, and a driving shaft;

[0035] After clamping, the air inspection is performed to detect whether the end face of the worm gear 6 is accurately positioned. If the positioning is accurate, the equipment body 1 is also provided with a front-and-rear sliding structure connected to the positioning mechanism 3, and the front-and-rear sliding structure includes a driving cylinder. The equipment body 1 is also equipped with positioning pins for fixing the left slide feed mechanism 2 and the right slide feed mechanism 4. The left slide feed mechanism 2 and the right slide feed mechanism 4 include a left slide and a right slide. The slides in the front-and-rear direction are driven by the cylinders to move backward along the front-and-rear direction to the processing position. The barcode scanner starts to scan the QR code above the end face of the worm gear 6. If it is correct, the positioning pins automatically move the slide to the processing position after the slide reaches the processing position. The slide is locked (the positioning pin adopts a tapered pin to accurately locate the slide position). The right and left slides move quickly to the fast meshing position with the worm gear at the same time, and move slowly to the meshing position with the worm gear; the processing side servo motor 701 continues to move the slide forward, so that the worm on the worm tool spindle 703 drives the worm to apply pressure to the worm gear 6. When the force applied by the worm to the worm gear 6 is 400N, the magnetic powder brake 807 starts to work, and the torque of the magnetic powder brake 807 transmits the torque to the braking side tool worm 803 through the coupling. The braking side tool worm 803 meshes with the worm gear 6, causing the worm gear 6 to produce a certain damping;

[0036] In this example, more specifically, the worm tool spindle 703 is directly driven and connected by the servo motor 701 through a coupling, and the torque sensor 702 is arranged between the servo motor 701 and the worm tool spindle 703, which can detect the force on the spindle in real time and feed it back to the servo motor, automatically adjust the speed and torque of the motor, so that the worm tool can achieve a very ideal speed and torque when processing the worm wheel;

[0037] The other side of the driving worm tool spindle 703 is installed with the quick tool changing mechanism 704 and the tool automatic clamping mechanism 705 in sequence, the origin sensor 805 and the encoder 806 are installed on the driving shaft in sequence, the other side of the driving shaft is fixedly connected with the braking side tool worm 803, and the tool setting servo motor 804 and the driving shaft are connected through a synchronous belt; more specifically, the positioning mechanism 3 is installed between the driving side 7 and the braking side 8, and is meshed and connected with the driving worm tool spindle 703 and the braking side tool worm 803; the magnetic powder brake 807 is directly connected to the driving shaft of the braking side 8.

[0038] Among them, the driving shaft of the braking side 8 is equipped with an origin sensor 805 and an encoder 806 (incremental), a magnetic powder brake 807, an electromagnetic clutch 808, and a servo motor 804 (the servo motor 804 and the driving shaft are connected by a synchronous belt. Since the motor on the braking side must be disconnected from the driving shaft during the running-in of the worm gear 6, but the servo motor 804 is required to drive the driving shaft to rotate during tool setting to find the correct meshing angle between the worm and the worm gear 6. Therefore, when the worm is tool set, the electromagnetic clutch 808 is energized (the electromagnetic clutch 808 is attracted, and the driving shaft and the servo motor 804 are connected). The servo motor 804 drives the driving shaft to rotate to find the correct meshing angle), so that the worm gear 6 can mesh well with the worm gear 6 during each processing. The magnetic powder brake 807 is directly connected to the driving shaft of the braking side 8, and the magnetic powder brake 807 is used to increase the force on the driving shaft of the braking side 8. When the tool worm 803 on the braking side is being processed, the magnetic powder brake 807 starts to work, and the electromagnetic clutch 808 is powered off (disconnecting the servo motor 804 and the drive shaft). The resistance applied by the magnetic powder brake 807 can be directly applied to the drive shaft, and the drive shaft is directly transmitted to the tool worm 803 on the braking side. The tool worm 803 on the braking side meshes with the worm wheel 6, giving the worm wheel 6 a certain reverse force, so that the tool worm 803 has a certain damping during the meshing processing, and the tool worm 803 can be well run-in with the worm wheel 6; the braking side is also provided with a pressure sensor, which can detect the pressure value of the tool worm 803 on the braking side during braking in real time, and the pressure value detected by the pressure sensor is converted into the required information through system processing, and fed back to the machine tool system, and the system can adjust the braking servo motor to adjust the pressure applied by the brake worm on the braking side on the worm wheel according to this information, so as to run-in the surface of the worm wheel 6;

[0039] By using a magnetic powder brake 807 on the braking side 8 to apply damping to the worm wheel 6, the worm wheel 6 has a certain resistance during the running-in process, which can achieve a more ideal running-in effect; and by improving the surface of the worm wheel 6, the surface of the worm wheel 6 has certain textures after running-in, and has a certain grease storage function, which can greatly reduce or eliminate abnormal noise; and improve the quality of the automobile steering gear.

[0040] The servo motor 701 on the processing side (right side) starts to work. (The servo motor 701 transmits the torque to the driving worm tool spindle 703 through the coupling. The tool worm engages to make the worm wheel 6 and the worm run-in. During the processing, a torque sensor 702 is provided between the servo motor 701 and the tool worm. It can detect the torque output by the servo motor 701 given to the worm tool in real time, and feed it back to the airport system to adjust the output force and output speed of the servo motor 701 in real time. A pressure sensor is also provided on this side. Through the detection of the pressure sensor, the pressure applied to the worm by the worm tool spindle 703 can be driven in real time, and the pressure applied to the worm by the servo motor 701 can be adjusted to the ideal pressure applied by the worm tool on the worm wheel 6 through the servo motor 701.) If it is incorrect, the equipment exits to the initial position.

[0041] More specifically, refer to Figure 8 The equipment body 1 is provided with a vortex tube for cooling the worm wheel 6 and the worm cutter. The vortex tube is a very simple energy separation device, which is composed of a nozzle, a vortex chamber, a separation orifice plate and cold and hot end tubes. During operation, the compressed gas expands and accelerates in the nozzle and then rotates, and then the airflow enters the hot end of the vortex tube along the tangential direction at a speed of 1,000,000rpm. When the airflow rotates at high speed in the vortex tube, it is separated into two parts of airflow with unequal total temperatures after vortex transformation. The airflow temperature in the center of the vortex chamber is low. This cold airflow forms ultra-low temperature cold air through the center of the generator and is collected at the cold air end for discharge. The airflow temperature in the outer layer of the vortex chamber is high. The ratio of cold and hot flow can be adjusted by adjusting the hot end valve, so that a satisfactory cooling effect or heating effect can be obtained.

[0042] At the same time, a pneumatic position sensor is installed on the detection air circuit, and a pneumatic with a diameter of 1.5mm is installed on the end face positioning workpiece of the worm gear. If the workpiece is not placed flat or the positioning is not ideal, the pneumatic position sensor will alarm, and the information will be fed back to the equipment, indicating that the workpiece clamping and positioning is unqualified. If the workpiece clamping and positioning is qualified, the equipment will operate normally until the worm gear running-in and detection are completed.

[0043] After the worm wheel 6 is processed, the worm wheel 6 needs to be tested for circumferential runout. When testing the runout, the force applied by the worm on the worm wheel 6 should be 20N after the worm and the worm wheel 6 are meshed.

[0044] During the test, the rectangular springs on the upper small slides on the left and right sides begin to compress. When the pressure sensor is compressed to 20N, the right worm drives the worm wheel 6 to rotate. The displacement sensor monitors the meshing point of the worm and worm wheel 6 in real time and records the vibration when the worm wheel 6 rotates to determine whether the worm wheel is qualified.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A worm gear running-in device for a vehicle steering system, comprising a device body (1), wherein the device body (1) comprises a left slide feeding mechanism (2), a positioning mechanism (3), a worm measuring and forcing small slide, a right slide feeding mechanism (4), a detection mechanism (5) and a hydraulic system, characterized in that: The positioning mechanism (3) comprises a housing (201), a hydraulic clamping mandrel (202), a rotating spindle (203), and a clamping oil cylinder (204); the hydraulic clamping mandrel (202) is fixed on the rotating spindle (203); the hydraulic clamping mandrel (202) is provided with an inner circle clamping structure; the hydraulic clamping mandrel (202) is clamped with a worm gear (6) through the inner circle clamping structure; a push rod (205) is connected between the output end of the clamping oil cylinder (204) and the rotating spindle (203); a disc spring (206) is installed on the upper outer side of the push rod (205); The detection mechanism (5) comprises a driving side (7) and a braking side (8), wherein the driving side (7) and the braking side (8) are respectively mounted on the right slide feeding mechanism (4) and the left slide feeding mechanism (2), wherein the driving side (7) comprises a servo motor (701), a torque sensor (702), a driving worm tool spindle (703), a first rapid tool changing mechanism (704), and a first automatic tool clamping mechanism (705); and the braking side (8) comprises a second automatic tool clamping mechanism (801), a second rapid tool changing mechanism (802), a braking side tool worm (803), a tool setting servo motor (804), an origin sensor (805), an encoder (806), a magnetic powder brake (807), and a second automatic tool clamping mechanism (808). 07), electromagnetic clutch (808), drive shaft; the drive worm tool spindle (703) is directly driven and connected by the servo motor (701) through a coupling, the torque sensor (702) is arranged between the servo motor (701) and the drive worm tool spindle (703), the other side of the drive worm tool spindle (703) is installed with a quick tool change mechanism (704) and a tool automatic clamping mechanism (705) in sequence, the origin sensor (805) and the encoder (806) are installed on the drive shaft in sequence, the other side of the drive shaft is fixedly connected with the brake side tool worm (803), and the tool setting servo motor (804) and the drive shaft are connected through a synchronous belt; The hydraulic clamping mandrel (202) clamps the worm gear (6) via a disc spring (206); when the hydraulic clamping mandrel (202) releases the worm gear (6), the clamping oil cylinder (204) drives the push rod (205) to move upward in one direction through oil supply from the hydraulic system; Positioning pins for fixing the left slide feeding mechanism (2) and the right slide feeding mechanism (4) are also installed on the equipment body (1).

2. The automobile steering system worm gear running-in device according to claim 1, characterized in that: The positioning mechanism (3) is installed between the driving side (7) and the braking side (8), and is meshingly connected with the driving worm tool spindle (703) and the braking side tool worm (803).

3. The automobile steering system worm gear running-in device according to claim 1, characterized in that: The equipment body (1) is also provided with a front-rear sliding structure connected to the positioning mechanism (3), and the front-rear sliding structure includes a driving cylinder.

4. The automobile steering system worm gear running-in device according to claim 1, characterized in that: The magnetic powder brake (807) is directly connected to the driving shaft of the braking side (8).

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