High-temperature and high-frequency endurance test device for pull rod of steering engine

Abstract

The utility model discloses a steering engine pull rod high-temperature high-frequency endurance test device. The device comprises a fixed rack, a heat preservation box, an executing mechanism, a hydraulic cylinder driving mechanism and a cylinder loading mechanism, the heat preservation box is arranged above the fixed rack, the executing mechanism is packaged in the heat preservation box, and the hydraulic cylinder driving mechanism and the air cylinder loading mechanism are arranged outside the heat preservation box. The high-temperature and high-frequency swing and constant value loading durability testing device is accurate, reliable, convenient and efficient to realize high-temperature and high-frequency swing and constant value loading durability testing of the automobile steering engine pull rod.

Description

Technical Field

[0001] The utility model belongs to the technical field of durability test of automobile steering gear tie rods, and in particular relates to a high-temperature and high-frequency durability test device for steering gear tie rods. Background Art

[0002] The steering gear tie rod is an important part of the automobile steering mechanism. It directly affects the stability of automobile handling, the safety of operation and the service life of tires. When the car is turning, the tie rod ball pin swings relative to the ball pin seat, and the tie rod is subject to tension. Its working environment is often under high temperature conditions. The durability test of the steering gear tie rod is to replicate the actual vehicle state. It is usually required that the ball pin swings relative to the ball pin seat at a certain frequency and angle in a high temperature environment, and a certain axial load is applied at the same time. Therefore, the test device needs to have swing drive, fixed value loading and temperature monitoring functions. The structure is relatively complex. At present, there is no steering gear tie rod high temperature and high frequency durability test device that meets the needs. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the above-mentioned background technology and to provide a steering gear tie rod high temperature and high frequency durability test device which makes the ball stud swing at high frequency relative to the ball stud seat under certain high temperature conditions and applies a certain axial load to the tie rod body.

[0004] The technical solution adopted by the utility model is: a high-temperature and high-frequency durability test device for a steering gear tie rod, comprising a fixed frame, an insulation box, an actuator, a hydraulic cylinder drive mechanism and a cylinder loading mechanism; the insulation box is placed above the fixed frame, the actuator is packaged in the insulation box, the hydraulic cylinder drive mechanism and the cylinder loading mechanism are placed outside the insulation box, the actuator comprises a tooling fixing plate mounted on the upper surface of the fixed frame, a fixed bracket, a swing shaft, a swing bracket, a rod end bearing shaft, and a rod end bearing extension rod, the bottom of the fixed bracket is mounted on the tooling fixing plate, the straight arms on both sides of the fixed bracket are respectively used to install deep groove ball bearings, the swing The bracket is H-shaped in appearance, and the center of the swing bracket is used to fix the ball pin. The left and right lower arms of the swing bracket are connected to the swing shaft, and the swing shaft is connected to the swing bracket through deep groove ball bearings installed on both sides of the fixed bracket. The left and right upper arms of the swing bracket are respectively used to install the rod end bearing shaft. The inner hole of the rod end bearing passes through the rod end bearing shaft and can rotate around the axis. One end of the rod end bearing extension rod is connected to the rod end bearing and passes through a side surface of the insulation box. The other end of the rod end bearing extension rod is connected to the hydraulic cylinder drive mechanism. One end of the pull rod body is hinged to the ball pin through the ball pin seat, and the other end passes through the other opposite side of the insulation box and is connected to the cylinder loading mechanism.

[0005] A further preferred structure is that the thermal insulation box includes two opposite front panels, two opposite rear panels and a top cover plate which are sealed and connected, the two rear panels are respectively provided with a first loading hole panel and a second loading hole panel, the fixed frame is a cast iron square box structure, the front panel is fixed on the cast iron square box, and one of the front panels is respectively provided with an air inlet and an air outlet at the upper and lower parts.

[0006] A further preferred structure is that the left and right lower arms of the swing bracket respectively have threaded holes for connecting the first swing shaft and the second swing shaft, the first swing shaft and the second swing shaft respectively pass through the first deep groove ball bearing and the second deep groove ball bearing installed on both sides of the fixed bracket, and are connected to the swing bracket through threads.

[0007] A further preferred structure is that the left and right upper arms of the swing bracket respectively have a through hole and a threaded hole for installing the rod end bearing shaft, the inner hole of the rod end bearing passes through the rod end bearing shaft and can rotate around the axis, one end of the rod end bearing extension rod is connected to the rod end bearing and passes through the second loading hole panel, and the other end of the rod end bearing extension rod is connected to the hydraulic cylinder drive mechanism.

[0008] A further preferred structure is that the hydraulic cylinder drive mechanism includes a hydraulic cylinder force sensor connected to the other end of the rod end bearing extension rod, the hydraulic cylinder force sensor is connected to the hydraulic cylinder through a hydraulic cylinder adapter, and the hydraulic cylinder drives the swing bracket to swing cyclically with the swing shaft as the rotation center.

[0009] A further preferred structure is that the cylinder loading mechanism includes a tie rod adapter, one end of the tie rod body is hinged to the ball pin through a ball pin seat, the other end is connected to one end of the tie rod adapter through a thread and passes through the first loading hole panel, two ends of the cylinder force sensor are respectively connected to the other end of the tie rod adapter and one end of the cylinder adapter, and the other end of the cylinder adapter is connected to the cylinder to apply axial tension to the tie rod assembly.

[0010] A further preferred structure is that the fixed bracket is a U-shaped structure, and the straight arms on both sides are used to install the through holes of the deep groove ball bearings, and the inner sides are provided with bosses to limit the axial inward displacement of the outer ring of the deep groove ball bearings, and the bearing end covers are respectively installed on the outer sides of the straight arms to limit the axial outward displacement of the outer ring of the deep groove ball bearings.

[0011] A further preferred structure is that an intermediate horizontal plate is provided in the middle of the swing bracket, and a tapered hole for fixing the ball pin is provided in the center of the intermediate horizontal plate. The rod of the ball pin passes through the tapered hole and is locked by a nut, which can improve the fitting accuracy and firmness.

[0012] A further preferred structure is that a circular boss is provided in the middle of the first swing shaft and the second swing shaft, and the diameter of the boss is larger than the outer wall of the inner ring of the deep groove ball bearing, so that after it is screwed into the lower arm of the swing bracket, the inner ring of the deep groove ball bearing can be pressed from the outside; and a boss with a diameter larger than the outer wall of the inner ring of the deep groove ball bearing is provided at the threaded hole of the lower arm of the swing bracket, which is used to press the inner ring of the deep groove ball bearing from the inside.

[0013] In a further preferred structure, the rod end bearing shaft is inserted from the through hole side of the upper arm of the swing bracket, the rod end bearing is installed after the first bushing is assembled, and then the second bushing is assembled and screwed into the threaded hole of the upper arm of the swing bracket.

[0014] The utility model can maintain the high temperature of the sample surface, effectively and accurately realize the swing amplitude and frequency, and simultaneously carry out axial fixed value loading, so as to simulate the actual vehicle working condition to carry out the high temperature and high frequency durability test of the steering gear tie rod; it can accurately, reliably, conveniently and efficiently realize the high temperature and high frequency swing and fixed value loading durability test of the automobile steering gear tie rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the high temperature and high frequency endurance test of the steering gear tie rod;

[0016] Figure 2 This is a schematic diagram of the external structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0018] Figure 4 This is a cross-sectional view of the cylinder loading mechanism.

[0019] In the figure, 1-insulation box (1-1-front panel; 1-2-rear panel; 1-3-first loading hole panel; 1-4-second loading hole panel; 1-5-cover plate); 2-air inlet; 3-air outlet; 4-cast iron square box; 5-tooling fixing plate; 6-fixing bracket; 7-swing shaft (7-1-first swing shaft; 7-2-second swing shaft); 8-deep groove ball bearing (8-1-first deep groove ball bearing; 8-2-second deep groove ball bearing) Groove ball bearing); 9-swing bracket (9-1-middle cross plate); 10-bearing end cover; 11-sleeve (11-1-first sleeve; 11-2-second sleeve); 12-rod end bearing shaft; 13-rod end bearing; 14-rod end bearing extension rod; 15-hydraulic cylinder force sensor; 16-hydraulic cylinder adapter; 17-tie rod adapter; 18-cylinder adapter; 19-cylinder force sensor; A-ball pin; B-tie rod body. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0021] like Figure 1 As shown, the steering gear tie rod assembly consists of a tie rod body, a ball pin and a ball pin seat; one end of the tie rod body has a fastening external thread, and the other end is connected to the ball pin seat; the ball pin seat is connected to the ball pin and limits the three translational degrees of freedom of the ball pin; one end of the ball pin is spherical and concentric with the inner spherical wall of the ball pin seat, the middle end is a tapered rod, and the end has a fastening external thread; the test requires that the center of the circle of the ball pin seat and the ball pin be the swing center, the swing angle be the symmetry axis of the ball pin rod, and the plane where the ball pin rod axis and the tie rod body axis are located be the swing plane for cyclic swing, and the load is applied to one end of the tie rod body and the direction is to pull outward along the tie rod body axis; the test requires high precision for the position of the swing center and the loading center, exceeding the error range may cause swing angle and load deviation, inaccurate test results or even abnormal failure.

[0022] like Figure 2 As shown, since the temperature requirement reaches 80°C, the actuator needs to be packaged in an insulation box 1, and the insulation box 1 consists of two opposite front panels 1-1, two opposite rear panels 1-2, a first loading hole panel 1-3 on the two rear panels 1-2, a second loading hole panel 1-4 and a top cover 1-5, wherein the front panel 1-1 is fixed on the cast iron square box 4, and the rear panel 1-2, the first loading hole panel 1-3, the second loading hole panel 1-4 and the cover 1-5 are installed in sequence after the actuator is installed, wherein an air inlet 2 and an air outlet 3 are respectively provided on the upper and lower parts of one of the front panels 1-1, and insulation cotton is filled in the gap; the high-temperature air delivered by the hot air blower is charged into the insulation box 1 through the air inlet 2, and the circulating air is discharged through the air outlet 3; thermocouple patches are pasted on the inner wall of the insulation box 1 and the surface of the sample to collect temperature data, and the power of the hot air blower is adjusted according to the feedback data to keep the temperature constant.

[0023] like Figure 3As shown, the actuator includes a tool fixing plate 5 installed on the upper surface of the cast iron square box 4 for fixing the tool; the bottom of the fixing bracket 6 is installed on the tool fixing plate 5 by bolts; the fixing bracket 6 is used to install the swing shaft 7; wherein the swing shaft 7 includes a first swing shaft 7-1 and a second swing shaft 7-2, the first swing shaft 7-1 and the second swing shaft 7-2 respectively pass through the first deep groove ball bearing 8-1 and the second deep groove ball bearing 8-2 installed on both sides of the fixing bracket 6, and are connected to the swing bracket 9 by threads; the swing bracket 9 is H-shaped in appearance, and the left and right lower arms are respectively provided with threaded holes for connecting the first swing shaft 7-1 and the second swing shaft 7-2, and the center of the middle cross plate 9-1 of the swing bracket 9 is provided with a tapered hole for fixing the ball pin A of the pull rod assembly. The left and right upper arms of the frame 9 are respectively provided with a through hole and a threaded hole for installing the rod end bearing shaft 12; the inner hole of the rod end bearing 13 passes through the rod end bearing shaft 12 and can rotate around the axis; one end of the rod end bearing extension rod 14 is connected to the rod end bearing 13 and passes through the second loading hole panel 1-4, and the other end is connected to the hydraulic cylinder force sensor 15; the hydraulic cylinder force sensor 15 is connected to the hydraulic cylinder through the hydraulic cylinder adapter 16, and the hydraulic cylinder drives the swing bracket 9 to swing cyclically with the swing shaft 7 as the rotation center; one end of the pull rod body B is hinged to the ball pin through the ball pin seat, and the other end is connected to the pull rod adapter 17 through a thread and passes through the first loading hole panel 1-3; the two ends of the cylinder force sensor 19 are respectively connected to the pull rod adapter 17 and the cylinder adapter 18, and the cylinder applies axial tension to the pull rod assembly.

[0024] In order to ensure the accuracy of the loading center and prevent the axial movement and deviation of the rotating parts during the test, a limit structure is designed such as Figure 4 As shown, a circular boss is added in the middle of the first swing shaft 7-1 and the second swing shaft 7-2, and the diameter is slightly larger than the outer wall of the inner ring of the deep groove ball bearing 8, so that after it is screwed into the lower arm of the swing bracket 9, the inner ring of the deep groove ball bearing 8 can be pressed from the outside. There is also a boss with a diameter slightly larger than the outer wall of the inner ring of the deep groove ball bearing 8 at the threaded hole of the lower arm of the swing bracket 9, which is used to press the inner ring of the deep groove ball bearing 8 from the inside; the fixed bracket 6 is a U-shaped structure, and the straight arms on both sides are used to install the bosses on the inner sides of the through holes of the deep groove ball bearings 8 to limit the axial inward displacement of the outer ring of the deep groove ball bearing 8, and the bearing end covers 10 are respectively installed on the outer sides of the straight arms on both sides to limit the axial outward displacement of the outer ring of the deep groove ball bearing 8.

[0025] In order to ensure the accuracy of the swing center and prevent the swing plane of the swing mechanism from deviating during the test, a limit structure is designed as follows: Figure 4As shown, the middle section of the rod end bearing shaft 12 is a cylinder with the same inner diameter as the rod end bearing 13, the front end is a square boss for end face limiting and tightening, and the end is an external thread assembled in the threaded hole of the upper arm of the swing bracket 9; the rod end bearing shaft 12 is inserted from the through hole side of the upper arm of the swing bracket 9, and the rod end bearing 13 is installed after the first bushing 11-1 is assembled, and then the second bushing 11-2 is assembled and screwed into the threaded hole of the upper arm of the swing bracket 9; after the assembly is completed, the end faces of the rod end bearing 13 on both sides are limited by the bushings 11 on both sides to avoid the deviation of the swing plane.

[0026] It also includes a monitoring system, which consists of a temperature sensor, a pressure sensor and an analysis and control system; thermocouple patches are attached to the inner wall of the insulation box 1 and the surface of the sample to collect temperature data, and the power of the hot air blower is adjusted according to the feedback data to keep the temperature constant; the hydraulic cylinder force sensor 15 and the cylinder force sensor 19 collect the hydraulic cylinder and cylinder pressure values, detect abnormal conditions, and adjust the control parameters according to the feedback data to keep the axial load stable.

[0027] The utility model adopts a swing mechanism with a ball pin swing center axis as a rotation axis to install the ball pin; the hydraulic cylinder is connected to the swing mechanism through a rod end ball bearing, and pushes and pulls the ball pin according to the requirements of an inclination angle of ±3° and a frequency of 15Hz; the ball pin swings cyclically relative to the ball pin seat, the ball pin seat is located at one end of a pull rod body, and the other end of the pull rod body is connected to the cylinder; the cylinder applies an axial pulling force of 2KN to the pull rod; the above structure is encapsulated in an insulation box, and the real-time temperature is detected by a temperature sensor attached to the surface of the sample, and the air supply state of the hot air blower is adjusted to keep the surface temperature of the sample at 80°C.

[0028] The utility model accurately and reliably realizes high-frequency swing and fixed-value loading of the steering gear tie rod under high-temperature conditions, and meets the requirements of durability test.

[0029] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A high temperature and high frequency durability test device for a steering gear tie rod, characterized in that: The invention comprises a fixed frame, an insulation box (1), an actuator, a hydraulic cylinder drive mechanism and a cylinder loading mechanism; the insulation box (1) is placed above the fixed frame, the actuator is encapsulated in the insulation box (1), the hydraulic cylinder drive mechanism and the cylinder loading mechanism are placed outside the insulation box (1), the actuator comprises a tool fixing plate (5) mounted on the upper surface of the fixed frame, a fixed bracket (6), a swing shaft (7), a swing bracket (9), a rod end bearing shaft (12), and a rod end bearing extension rod (14), the bottom of the fixed bracket (6) is mounted on the tool fixing plate (5), the straight arms on both sides of the fixed bracket (6) are respectively used to install deep groove ball bearings (8), the swing bracket (9) is H-shaped in appearance, and the center of the swing bracket (9) is used to fix the ball bearings. The swing bracket (9) has a head pin (A), and the left and right lower arms of the swing bracket (9) are connected to the swing shaft (7). The swing shaft (7) passes through the deep groove ball bearings (8) installed on both sides of the fixed bracket (6) and is connected to the swing bracket (9). The left and right upper arms of the swing bracket (9) are respectively used to install the rod end bearing shaft (12). The inner hole of the rod end bearing (13) passes through the rod end bearing shaft (12) and can rotate around the axis. One end of the rod end bearing extension rod (14) is connected to the rod end bearing (13) and passes through a side surface of the insulation box (1). The other end of the rod end bearing extension rod (14) is connected to the hydraulic cylinder drive mechanism. One end of the pull rod body (B) is hinged to the ball pin (A) through a ball pin seat, and the other end passes through the other opposite side of the insulation box (1) and is connected to the cylinder loading mechanism.

2. A high temperature and high frequency endurance test device for a steering gear tie rod according to claim 1, characterized in that: The heat preservation box (1) comprises two opposite front panels (1-1), two opposite rear panels (1-2) and a top cover plate (1-5) which are sealed and connected; the two rear panels (1-2) are respectively provided with a first loading hole panel (1-3) and a second loading hole panel (1-4); the fixed frame is a cast iron square box (4) structure; the front panel (1-1) is fixed on the cast iron square box (4); and an air inlet (2) and an air outlet (3) are respectively provided on the upper and lower parts of one of the front panels (1-1).

3. The high temperature and high frequency durability test device for a steering gear tie rod according to claim 1, characterized in that: The left and right lower arms of the swing bracket (9) respectively have threaded holes for connecting the first swing shaft (7-1) and the second swing shaft (7-2); the first swing shaft (7-1) and the second swing shaft (7-2) respectively pass through the first deep groove ball bearing (8-1) and the second deep groove ball bearing (8-2) mounted on both sides of the fixed bracket (6), and are connected to the swing bracket (9) via threads.

4. A high temperature and high frequency endurance test device for a steering gear tie rod according to claim 2, characterized in that: The left and right upper arms of the swing bracket (9) respectively have a through hole and a threaded hole for mounting a rod end bearing shaft (12); the inner hole of the rod end bearing (13) passes through the rod end bearing shaft (12) and can rotate around the shaft; one end of the rod end bearing extension rod (14) is connected to the rod end bearing (13) and passes through the second loading hole panel (1-4); the other end of the rod end bearing extension rod (14) is connected to the hydraulic cylinder drive mechanism.

5. A high temperature and high frequency endurance test device for a steering gear tie rod according to claim 4, characterized in that: The hydraulic cylinder drive mechanism comprises a hydraulic cylinder force sensor (15) connected to the other end of the rod end bearing extension rod (14); the hydraulic cylinder force sensor (15) is connected to the hydraulic cylinder via a hydraulic cylinder adapter (16); and the hydraulic cylinder drives the swing bracket (9) to swing cyclically with the swing shaft (7) as the rotation center.

6. A high temperature and high frequency endurance test device for a steering gear tie rod according to claim 2, characterized in that: The cylinder loading mechanism comprises a tie rod adapter (17), one end of the tie rod body (B) is hinged to the ball pin (A) via a ball pin seat, and the other end is connected to one end of the tie rod adapter (17) via a thread and passes through the first loading hole panel (1-3), the two ends of the cylinder force sensor (19) are respectively connected to the other end of the tie rod adapter (17) and one end of the cylinder adapter (18), and the other end of the cylinder adapter (18) is connected to the cylinder to apply axial tension to the tie rod assembly.

7. The high temperature and high frequency endurance test device for a steering gear tie rod according to claim 1, characterized in that: The fixing bracket (6) is a U-shaped structure, and the straight arms on both sides are used to install the through holes of the deep groove ball bearing (8), and the inner sides are provided with bosses to limit the axial inward displacement of the outer ring of the deep groove ball bearing (8), and the outer sides of the straight arms on both sides are respectively installed with bearing end covers (10) to limit the axial outward displacement of the outer ring of the deep groove ball bearing (8).

8. The high temperature and high frequency endurance test device for a steering gear tie rod according to claim 1, characterized in that: An intermediate horizontal plate (9-1) is provided in the middle of the swing bracket (9), and a tapered hole for fixing a ball stud (A) is provided at the center of the intermediate horizontal plate (9-1), and the rod of the ball stud passes through the tapered hole and is locked by a nut.

9. The high temperature and high frequency endurance test device for a steering gear tie rod according to claim 3, characterized in that: A circular boss is provided in the middle of the first swing shaft (7-1) and the second swing shaft (7-2), the diameter of which is larger than the outer wall of the inner ring of the deep groove ball bearing (8), so that the inner ring of the deep groove ball bearing (8) can be pressed from the outside after being screwed into the lower arm of the swing bracket (9); a boss with a diameter larger than the outer wall of the inner ring of the deep groove ball bearing (8) is provided at the threaded hole of the lower arm of the swing bracket (9), so as to press the inner ring of the deep groove ball bearing (8) from the inside.

10. The high temperature and high frequency endurance test device for a steering gear tie rod according to claim 1, characterized in that: The rod end bearing shaft (12) is inserted from the through hole side of the upper support arm of the swing bracket (9), the first shaft sleeve (11-1) is assembled, the rod end bearing (13) is installed, and then the second shaft sleeve (11-2) is assembled and screwed into the threaded hole of the upper support arm of the swing bracket (9).

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