CN110793765A - Realize loaded car control arm endurance test rack of arbitrary angle - Google Patents

Abstract

The invention discloses an automobile control arm endurance test bench for realizing any angle loading, which comprises a bushing mounting table, a bearing and a bearing, wherein the bushing mounting table is used for simulating the relative position of a control arm during actual automobile mounting; the actuating cylinder is used for applying external force of a preset angle to the control arm along the horizontal plane; one end of the ball head clamp is connected with the output end of the actuating cylinder, and the other end of the ball head clamp is connected with a ball bolt of the control arm in a clamping mode; the front fixing bracket of the actuating cylinder is supported and arranged at the bottom of the front end of the actuating cylinder; the actuating cylinder reaction frame is fixedly arranged at the rear end of the actuating cylinder; the auxiliary limit mechanism of the actuating cylinder is fixedly connected with the top of the front end of the actuating cylinder; digital display protractor. The invention can accurately and efficiently realize the loading test of any angle in the horizontal plane of the control arm, shorten the endurance test time and improve the endurance test efficiency; the relative position of the control arm during actual loading can be accurately reproduced, and the test reliability is improved; the installation is simple, can carry out durability test and strength capability test, possesses good commonality.

Description

A durable test bench for automobile control arm that realizes loading at any angle

technical field

The invention relates to the technical field of auto parts testing, in particular to a control arm durability test bench device that realizes loading at any angle.

Background technique

As a part of the chassis that bears the main longitudinal and lateral forces, the control arm's durability and strength are important criteria to verify the design is qualified. Because the force on the Z bearing of the control arm in the vehicle coordinate system is negligible relative to the X and Y axes, the current control arm durability tests are mostly loaded in the X or Y direction of the vehicle, or first in the X direction and then in the Y direction. In order to shorten the endurance test time, there is also a multi-axial loading scheme, but the test requires two or more actuating cylinders, and the required bench is more complicated. In order to reduce test resources and improve test efficiency and reliability, automobile manufacturers currently provide control arm test solutions with arbitrary angle loading, that is, the loading direction of the actuating cylinder is at a certain angle with the X-axis or Y-axis of the vehicle (for example, with the X-axis 19 degree to load).

The patent CN208420381U (authorized announcement on January 22, 2019) introduces a separate bench test device for the control arm of a passenger car, which installs the two bushing fixtures of the control arm on the two bases respectively. Or Y-direction loading has high accuracy, but when loading at any angle is required, it is difficult to locate the two bases and there is a large error in positioning. At the same time, this scheme uses the ball head fixture for X-direction loading, but the fixture does not limit the vertical position of the groove of the ball pin, resulting in the vertical relative displacement of the fixture and the ball head during the test, which affects the reliability of the test;

Patent CN 203148664 U (authorized announcement on August 21, 2013) described the front subframe control arm test fixture, which uses two bolts to match the ball pin groove to achieve the purpose of vertical limit, but this solution requires The accuracy of the bolt hole is very high, and the matching effect between the groove surface and the bolt is not ideal, and the vertical limit may not meet the requirements;

In the above-mentioned known solution embodiments, the control arm test bench has the following problems:

1) The solution without vertical limit or vertical limit for the ball head fixture is not ideal, and there may be vertical relative displacement between the ball head and the fixture during the experiment.

2) The actuating cylinder is not limited, and the actuating cylinder vibrates greatly during loading, which is easy to cause loading deviation and even lead to the failure of the test.

3) The test bench is only suitable for X-direction or Y-direction loading, and cannot achieve accurate and efficient loading at any angle, and the installation position of the control arm is different from the actual vehicle installation position due to the installation error of the base.

4) The scheme of multi-axis simultaneous loading requires system-level tests, which cannot be tested when other components are lacking and consumes a lot of resources, and the bench installation is more complicated.

SUMMARY OF THE INVENTION

In view of one of the above technical problems, the purpose of the present invention is to solve the problem that the control arm durability bench test cannot achieve accurate and efficient loading at any angle, and can accurately simulate the actual vehicle installation position of the control arm. The vertical displacement of the fixture and the ball head is controlled, and the test efficiency and reliability of the control arm bench are improved.

The above-mentioned purpose of the present invention is realized by at least one of the following technical solutions:

An automobile control arm durability test bench that realizes loading at any angle, including:

The bushing installation table simulates the relative position of the control arm during real vehicle installation by connecting the front and rear bushings of the control arm;

an actuating cylinder, arranged horizontally, for applying an external force of a preset angle along the horizontal plane to the control arm;

a ball head clamp, one end is connected with the output end of the actuating cylinder, and the other end clamps the ball bolt connected to the control arm;

The front fixing bracket of the actuating cylinder is supported and arranged at the bottom of the front end of the actuating cylinder;

The actuating cylinder reaction force frame is fixedly arranged at the rear end of the actuating cylinder to limit the position of the rear end of the actuating cylinder;

The actuating cylinder auxiliary limiting mechanism is fixedly connected to the top of the front end of the actuating cylinder to limit the Z-direction position of the front end of the actuating cylinder;

Digital protractor, one protractor arm is installed parallel to the bottom side of the bushing installation table, parallel to the X-axis of the vehicle, and the other protractor arm is installed parallel to the bottom side of the front fixing bracket of the actuating cylinder, and the loading direction of the actuating cylinder parallel.

Preferably, the bushing installation table includes:

support table;

The connecting plate is fixed on the support table by bolts, and is provided with several installation holes;

a plurality of bushing installation fixtures, which are installed and arranged on the connecting plate with adjustable positions, and are used for fixing and clamping each bushing of the control arm;

Several U-shaped clips are used to install and fix the support table with the corner nuts, and the position of the support table can be adjusted flexibly.

Preferably, the support table includes a top plate and a bottom plate arranged in parallel up and down, two side plates welded between the top plate and the bottom plate, and a reinforcement member is also welded at the connection between the bottom plate and the two side plates.

Preferably, the several bushing installation fixtures include:

The first bushing mounting fixture and the second bushing mounting fixture are relatively arranged on the connecting plate with adjustable positions, and are fixedly connected to the front bushing of the control arm through bushing pins;

The third bushing installation fixture is arranged on the connecting plate in an adjustable position, and is fixedly connected to the rear bushing of the control arm through bushing pins.

Preferably, the ball head fixture includes:

The ball head clamp body, the front end of the ball head clamp body is vertically penetrated at the left and right centerline positions with the clamp body front hole and the slot for installing the ball bolt, and the side surface of the ball head clamp body is penetrated and installed with a pair of Several bolts for fastening the ball bolt, the rear end of the ball head clamp body is horizontally provided with rear bolt holes of the clamp body at the left and right centerline positions; two slots, both of which intersect with the front hole of the fixture body;

Two rounded thin plates, respectively inserted into the two slots, are matched with the ball pin grooves of the ball bolt, and are fastened by the bolts installed on the other side of the ball head clamp body to restrict the ball head clamp body and the ball. Z-direction relative displacement of the bolt;

One end of the connecting block is fixedly connected to the actuating cylinder through the rear screw rod, and the other end is fixedly connected to the rear bolt hole of the clamp body of the clamp body through the front screw rod. The center of the bolt hole at the rear of the body is on the same line.

Preferably, the described actuating cylinder front fixing bracket includes:

The bottom plate is evenly provided with several bolt holes;

a support piece, welded on the bottom plate;

The connecting plate is provided with several bolt holes, and is fixedly connected to the top end of the support member through bolts.

Preferably, the actuating cylinder auxiliary limiting mechanism includes a fixed bottom plate, a support rod, a first connecting piece, a top plate of the auxiliary limiting mechanism, a screw rod, two U-shaped clips, two force rods, and a second connecting piece. The rod is arranged vertically and the upper and lower ends are connected with the first connecting piece and the fixed bottom plate respectively through the screw rod, the top plate is arranged horizontally and is connected with the first connecting piece through the bolt, and the two U-shaped clips are respectively connected with the screw rod and the second connecting piece. The connecting piece is threadedly connected, the two force rods are vertically arranged, and the two ends are respectively hinged with the two U-shaped clips through annular end heads, and the fixed bottom plate is fixedly connected with the front end of the actuating cylinder through bolts.

Preferably, the top plate is provided with a number of threaded holes along the length direction for adjusting the position of the auxiliary limiting mechanism to be connected with the screw rod.

Preferably, the bottom of the U-shaped clip is centrally provided with a U-shaped clip base bolt hole, and two cylindrical connecting blocks are symmetrically arranged on the inner sides of the U-shaped clip with a certain gap, and the centers of the two cylindrical connecting blocks are coaxially arranged. There are bolt holes on the end face of the U-clamp, the gap between the two cylindrical connecting blocks is matched with the thickness of the annular end, the axis of the screw rod, the axis of the two-force rod, the center of the bolt hole of the U-clamp base and the center of the central threaded hole of the second connecting piece are all on the same straight line.

Preferably, the actuating cylinder includes an actuating cylinder body, an actuating cylinder front bump that is fixedly arranged at the front end of the actuating cylinder body, an actuating cylinder base that is movably hinged at the rear end of the actuating cylinder body, and The actuating cylinder connecting plate connected to the actuating cylinder base, the actuating cylinder connecting plate is evenly provided with several connecting plate bolt holes, and the top of the actuating cylinder front bump is provided with several bolt holes; The actuating cylinder reaction force frame includes a reaction force frame body, a reaction force frame base plate fixedly arranged at the bottom of the reaction force frame body, and a number of reinforcements welded and arranged at the connection between the reaction force frame body and the reaction force frame base plate. , the reaction force frame body is provided with a plurality of groups of bolt holes that cooperate with the bolt holes of the connecting plate to support the actuating cylinder and limit the position.

Compared with the prior art, the beneficial effects of the present invention include:

The invention solves the problem that the control arm durability test cannot achieve accurate and efficient loading at any angle, can accurately and efficiently meet the requirements of arbitrary angle loading; can accurately simulate the relative position of the control arm in the actual vehicle installation state; The fixture controls the vertical displacement of the fixture and the ball head to make the test more reliable, while reducing the duration of the control arm durability test and improving the test efficiency; the reaction force frame, the front fixing bracket and the auxiliary limit mechanism work together to eliminate the loading of the actuating cylinder The present invention can complete both the durability test and the strength test, and has strong adaptability; the present invention comprehensively considers the longitudinal force and the lateral force, and the test efficiency is high and more reliable.

Description of drawings

1 is an isometric view of a durable test bench loaded at any angle with a control arm of the present invention;

Figure 2 is an isometric view of the bushing mounting table;

Figure 3 is a top view of the durability test bench;

Fig. 4 is the top view of the control arm of the test object;

Fig. 5 is the left side view of the control arm of the test subject;

Figure 6 is an isometric view of a special pin rod;

Figure 7 is a front view of the special pin rod installation;

Fig. 8 is the sectional view of A-A in Fig. 7;

Figure 9 is an isometric view of a digital protractor;

Figure 10 is a front view of the connection between the ball head clamp and the ball head;

Figure 11 is a schematic diagram of the rounded sheet with grooves and bolts;

Figure 12 is a front view of the ball head clamp;

Fig. 13 is the sectional view of A-A in Fig. 12;

Figure 14 is an isometric view of the front fixing bracket of the actuating cylinder;

Figure 15 is a left side view of the actuating cylinder auxiliary limit mechanism;

Fig. 16 is a partial cross-sectional view of the auxiliary limiting mechanism of the actuating cylinder;

Figure 17 is an isometric view of the secondary rod;

Figure 18 is an isometric view of the clevis of the auxiliary limit mechanism;

Figure 19 is an isometric view of the cylinder;

Figure 20 is an isometric view of the cylinder reaction frame;

Description of the drawings: 1- Bushing installation table, 2- Control arm, 3- Digital protractor, 4- Ball head clamp, 5- Actuating cylinder front fixing bracket, 6- Actuating cylinder auxiliary limit mechanism, 7- Actuating cylinder, 8-actuating cylinder reaction frame, 101-U-clamp, 102-bottom plate, 103-top plate, 104-connecting plate, 105-first bushing installation fixture, 106-second bushing mounting fixture, 107-the third bushing mounting fixture, 201-control arm front bushing, 202-control arm rear bushing, 203- bushing pin rod, 204-ball bolt; 301-angle display, 302, 305- protractor mounting plate, 303, 304-Protractor arm, 401-Ball head clamp body, 402, 403, 404, 405, 406, 407-Bolt, 408, 409 rounded sheet, 410-Slotting, 411-Slotting, 412-Clamping body Front hole, 413-rear bolt hole of fixture body, 414-connection block, 501-connection plate, 502-support block, 503-support block, 504-support block, 505-base plate, 506-reinforcing piece, 507-bolt hole, 508-bolt hole, 509-bolt hole, 510-bolt hole, 511-bolt hole, 601-fixed base plate, 602-reinforcing piece, 603-support rod, 604-first connecting piece, 605-reinforcing piece, 606-auxiliary Limiting mechanism top plate, 607-screw, 608, 610-U-clamp, 609-two-force rod, 611-second connecting piece, 612, 613-ring end, 614-auxiliary limit mechanism U-clamp base bolt hole , 615- U-clamp end face bolt hole, 616- U-clamp cylindrical connecting block, 701- Actuating cylinder body, 702- Actuating cylinder front bump, 703- Actuating cylinder base, 704- Actuating cylinder connecting plate, 801-reaction frame body, 802-reaction frame bottom plate, 803-reinforcing piece.

Detailed ways

In order to better understand the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

As shown in Figure 1, a vehicle control arm durability test bench for loading at any angle includes:

Bushing installation table 1, by connecting the front and rear bushings of the control arm to simulate the relative position of the control arm when it is installed in a real vehicle;

An actuating cylinder 7, arranged horizontally, is used to apply an external force of a preset angle along the horizontal plane to the control arm;

One end of the ball clamp 4 is connected to the output end of the actuating cylinder 7, and the other end clamps the ball bolt 204 connected to the control arm;

The front fixing bracket 5 of the actuating cylinder is supported at the bottom of the front end of the actuating cylinder 7;

The actuating cylinder reaction force frame 8 is fixedly arranged at the rear end of the actuating cylinder 7 to limit the position of the rear end of the actuating cylinder 7;

The actuating cylinder auxiliary limiting mechanism 6 is fixedly connected to the top of the front end of the actuating cylinder 7 to limit the Z-direction position of the front end of the actuating cylinder 7;

Digital protractor 3, one protractor arm is installed parallel to the bottom side of the bushing installation table, parallel to the X-axis of the vehicle, and the other protractor arm is installed parallel to the bottom side of the front fixing bracket 5 of the actuating cylinder, and is parallel to the actuating cylinder. The loading direction is parallel.

The ball head clamp 4 is fixedly connected with the actuating cylinder through the connecting block and the screw rod, and the driving force acts on the ball pin through the ball head clamp 4 to load the control arm 2; On the front and rear bushing clamps on the connecting plate 104 . The actuating cylinder 7 is limited by the actuating cylinder reaction force frame 8 , the actuating cylinder front fixing bracket 5 and the actuating cylinder auxiliary limiting mechanism 6 to control the shaking of the actuating cylinder 7 during operation. 7, one arm 303 of the digital protractor 3 is installed on the bottom plate of the bushing installation platform through the protractor mounting plate 302, parallel to the X-axis of the vehicle; the other arm 304 is mounted on the protractor mounting plate 305 through the The bottom plate of the front fixing bracket of the actuating cylinder is parallel to the loading direction of the actuating cylinder;

As shown in FIG. 2 , the bushing installation platform 1 is formed by welding a top plate 103 , a bottom plate 102 and two side plates, and is reinforced by a reinforcing member 108 . The U-clamp 101 cooperates with the corner nut to install the bushing mounting table 1, and the position of the mounting table can be flexibly adjusted. 4 , 5 to 8 , the connecting plate 104 is fixedly connected to the top plate 103 by four bolts, and the front bushing 201 of the control arm is installed by the first bushing mounting fixture 105 and the second bushing mounting fixture 106 which are placed opposite to each other. For installation, adjust the relative position and opening position of the two to be suitable for different control arms 2; the bushing pin rod 203 passes through the third bushing installation fixture 107, the rear bushing 202 of the control arm, and passes through the nut and bushing installation table The top plate 103 and the connecting plate 104 are connected to each other. The first bushing installation fixture 105, the second bushing mounting fixture 106, and the third bushing mounting fixture 107 are all fixedly connected to the connecting plate 104 by bolts. The bushing mounting table 1 can truly reproduce the relative position of the control arm when it is actually loaded into the vehicle.

As shown in FIG. 3 and FIG. 9 , one of the protractor arms 304 of the digital protractor 3 is installed parallel to one side of the bottom plate 505 of the front fixing bracket 5 of the actuating cylinder through the protractor mounting plate 305 , and this side is connected to the loading of the actuating cylinder 7 . The direction is parallel; the other protractor support arm 303 of the digital protractor 3 is installed in parallel to one side of the bushing mounting platform bottom plate 102 through the protractor mounting plate 302, and this side is parallel to the X-axis direction of the vehicle. Since the ball pin of the control arm can rotate around the front hole 412 of the fixture body of the ball head fixture body 401 along the horizontal plane to adjust the position of the bushing mounting table 1, the digital protractor 3 can display the loading angle in real time, which is accurate and efficient.

As shown in FIG. 10 , the ball head clamp 4 includes a connecting block 414 and a ball head clamp body 401 . Referring to FIGS. 1 , 11 and 12 , one end of the connecting block 402 is connected to the actuating cylinder 7 through a screw rod, and the other end is connected to the actuating cylinder 7 through a screw rod. It is connected to the rear bolt hole 413 of the clamp body of the ball head clamp body 401 , and the front and rear screw axes are on the same straight line as the center of the ball head and the rear bolt hole 413 of the clamp body. The ball bolt 204 is matched with the front hole 412 of the fixture body, and the upper surface of the ball bolt 204 is flush with the top surface of the ball head fixture body 401 . The top surface of the ball head clamp body 401 is provided with notches 410 and 411 along the center line for easy installation, and bolts 402 , 403 , 404 and 405 are installed on the sides to fasten the ball bolt 204 . The front end surface of the ball head clamp body 401 is provided with two slots symmetrical along the center line, the two slots intersect with the front hole 412 of the clamp body, and rounded thin plates 408 and 409 are inserted along the slots. 11, the rounded thin plates 408, 409 are matched with the grooves of the ball pins, and are fastened by the bolts 406, 407 installed on the other side of the ball head clamp body 401 to control the Z of the ball head clamp 4 and the ball head The relative displacement to ensure that the loading is strictly along the XY plane.

As shown in FIG. 14 , the front fixing bracket 5 of the actuating cylinder includes a connecting plate 501 , a supporting member, a bottom plate 505 and a reinforcing member 506 . Each support piece includes support blocks 502, 503, 504 that are stacked and connected in sequence, each support block has a screw at one end and a threaded hole at the other end, and the screw axis, the center of the screw hole and the center of the bolt hole of the connecting plate are collinear. 1 and 19, the connecting plate 501 is connected with the lower end of the front bump 702 of the actuating cylinder through bolt holes 509 and 510, and the connecting plate 501 is then connected with the support block and the bottom plate through the bolt holes to support the actuating cylinder and limit it. bit. 15 to 18 , the actuating cylinder auxiliary limiting mechanism 6 consists of a fixed bottom plate 601 , a reinforcing member 602 , a support rod 603 , a connecting block 604 , a reinforcing member 605 , a screw 604 , U-shaped clips 608 and 610 , and a two-force rod 609 It is formed with the second connecting piece 611 . The support rod 603 is connected with the first connecting piece 604 and the bottom plate 601 by screws, the top plate 606 is connected with the first connecting piece 604 by bolts, and the reinforcing piece 602 is welded at the connection between the support rod 603 and the fixed bottom plate 601. The reinforcement member 605 is welded and disposed at the connection between the connection block 604 and the top plate 606 . The top plate 606 is provided with a plurality of threaded holes for connecting with the screw 607, and the position of the auxiliary limiting mechanism can be adjusted. The axis of the screw 607 , the axis of the two force rod 609 , the hole center 614 of the threaded hole of the U-clamp base, and the hole center of the central threaded hole of the second connecting piece 611 are all on the same straight line. The two annular ends 612, 613 of the two-bar 609 and the end faces of the U-clamps 608, 610 are fastened by the U-clamp cylindrical connecting block 616 and bolts, and the second connecting piece 611 is connected with the bolt holes on both sides. The upper end of the front bump 702 of the actuating cylinder is connected to assist the limiting of the actuating cylinder. According to FIG. 1 , FIG. 19 , and FIG. 20 , the actuating cylinder 7 includes an actuating cylinder body 701 , an actuating cylinder front bump 702 fixedly arranged at the front end of the actuating cylinder body 701 , and a living cylinder is hinged on the actuating cylinder body 701 . The actuating cylinder base 703 at the rear end of the actuating cylinder body 701, the actuating cylinder connecting plate 704 fixedly connected to the actuating cylinder base 703, the actuating cylinder connecting plate 704 is evenly provided with a number of connecting plate bolt holes, so The actuating cylinder base 703 is connected with the connecting plate 704 by bolts. The actuating cylinder reaction force frame 8 includes a reaction force frame body 801, a reaction force frame bottom plate 802 fixedly arranged at the bottom of the reaction force frame body 801, welded on the reaction force frame body 801 and the reaction force frame bottom plate 802 A plurality of reinforcements 803 at the connection point, the actuating cylinder reaction frame 801 is provided with a plurality of sets of bolt holes that cooperate with the bolt holes of the connecting plate to support the actuating cylinder and limit the position. The front fixing bracket 5 of the actuating cylinder, the actuating cylinder auxiliary limiting mechanism 6, and the actuating cylinder reaction force frame 8 cooperate to support and limit the actuating cylinder 7 to prevent the vibration of the actuating cylinder 7 from affecting the test reliability.

The specific working process of the arbitrary-angle loading control arm durability test bench provided by the above embodiment is as follows:

Determine the position of the fixture according to the actual vehicle installation state of the control arm, install the control arm front bushing 201 and the control arm rear bushing 202 of the control arm 2 on the bushing mounting table 1, adjust the position of the bushing mounting table 1 and install the ball bolt 204 Connect with ball head clamp 4. The actuating cylinder 7 is installed on the actuating cylinder reaction force frame 8 and the actuating cylinder front fixing bracket 5 , and the output end of the actuating cylinder 7 is fixedly connected by tightening the connecting block 414 of the ball clamp 4 . Install the actuating cylinder auxiliary limit mechanism 6 to ensure reliable connection. Install the digital protractor 3, adjust the position of the bushing mounting table 1 to the desired loading angle, fix the bushing mounting table 1 with the U-clamp 101, and start loading. If the loading angle needs to be adjusted during the durability test, take out the rounded thin plates 408 and 409 and then loosen the ball head clamp 4, and then the required angle can be achieved by moving the bushing mounting table 1.

The above-mentioned embodiment is only a preferred solution of the present invention, and does not limit the present invention in any form. On the premise of not exceeding the technical solution recorded in the claims, there are other variants and modifications. within the protection scope of the present invention.

Claims (10)

1. The utility model provides a realize loaded car control arm endurance test rack of arbitrary angle which characterized in that includes:

the bushing mounting table simulates the relative position of the control arm during real vehicle mounting through the front bushing and the rear bushing which are connected with the control arm;

the actuating cylinder is horizontally arranged and is used for applying external force of a preset angle to the control arm along the horizontal plane;

one end of the ball head clamp is connected with the output end of the actuating cylinder, and the other end of the ball head clamp is connected with a ball bolt of the control arm in a clamping mode;

the front fixing bracket of the actuating cylinder is supported and arranged at the bottom of the front end of the actuating cylinder;

the actuating cylinder reaction frame is fixedly arranged at the rear end of the actuating cylinder and used for limiting the position of the rear end of the actuating cylinder;

the auxiliary limiting mechanism of the actuating cylinder is fixedly connected with the top of the front end of the actuating cylinder and used for limiting the Z-direction position of the front end of the actuating cylinder;

and one protractor arm of the digital display protractor is arranged on one side of the bottom of the bushing mounting table in parallel and is parallel to the X axis of the whole automobile, and the other protractor arm of the digital display protractor is arranged on one side of the bottom of the front fixing support of the actuating cylinder in parallel and is parallel to the loading direction of the actuating cylinder.

2. The test bed for testing the durability of the control arm of an automobile capable of realizing any angle loading according to claim 1, wherein the bushing mounting table comprises:

a support table;

the connecting plate is fixedly arranged on the supporting platform through bolts and is provided with a plurality of mounting holes;

the bushing mounting fixtures are arranged on the connecting plate in an adjustable position and are used for fixing and clamping each bushing of the control arm;

a plurality of U type presss from both sides, and cooperation ground angle nut is installed fixedly to a supporting bench to can adjust a supporting bench position in a flexible way.

3. The automobile control arm endurance test bed according to claim 2, wherein: the supporting platform comprises a top plate and a bottom plate which are arranged in parallel up and down, and two side plates welded between the top plate and the bottom plate, wherein a reinforcing piece is further welded at the joint of the bottom plate and the two side plates.

4. The automobile control arm endurance test bed according to claim 2, wherein: the plurality of bushing installation clamps include:

the first bushing mounting clamp and the second bushing mounting clamp are oppositely arranged on the connecting plate in an adjustable position and are fixedly connected with the front bushing of the control arm through a bushing pin;

and the third bushing mounting clamp is arranged on the connecting plate in an adjustable position and is fixedly connected with the rear bushing of the control arm through a bushing pin.

5. The automobile control arm endurance test bed according to claim 1, wherein: the ball head clamp comprises:

the ball head clamp comprises a ball head clamp body, wherein a clamp body front hole and a cutting groove for installing a ball bolt vertically penetrate through the front end of the ball head clamp body at the left and right central line positions, a plurality of bolts for fastening the ball bolt penetrate through the side surface of the ball head clamp body, and a clamp body rear bolt hole is horizontally arranged at the left and right central line positions at the rear end of the ball head clamp body; the front end face of the ball head clamp body is provided with two slots which are symmetrical along a central line along the horizontal direction, and the two slots are intersected with a front hole of the clamp body;

the two fillet thin plates are respectively inserted into the two slots, are matched with the ball pin grooves of the ball bolts, and are fastened through bolts arranged on the other side surface of the ball head clamp body to limit the Z-direction relative displacement of the ball head clamp body and the ball bolts;

one end of the connecting block is fixedly connected with the actuating cylinder through the rear screw, the other end of the connecting block is fixedly connected with the rear bolt hole of the clamp body through the front screw, and the axes of the front screw and the rear screw are on the same straight line with the ball head center of the ball bolt and the hole center of the rear bolt hole of the clamp body.

6. The automobile control arm endurance test bed according to claim 1, wherein: the actuating cylinder front fixing bracket comprises:

the bottom plate is uniformly provided with a plurality of bolt holes;

the supporting piece is welded on the bottom plate;

the connecting plate is provided with a plurality of bolt holes and is fixedly connected to the top end of the supporting piece through bolts.

7. The automobile control arm endurance test bed according to claim 1, wherein: the auxiliary limiting mechanism of the actuating cylinder comprises a fixed bottom plate, a supporting rod, a first connecting piece, an auxiliary limiting mechanism top plate, a screw rod, two U-shaped clamps, a two-force rod and a second connecting piece, wherein the supporting rod is vertically arranged, the upper end and the lower end of the supporting rod are respectively connected with the first connecting piece and the fixed bottom plate through the screw rod, the top plate is horizontally arranged and is connected with the first connecting piece through a bolt, the two U-shaped clamps are respectively in threaded connection with the screw rod and the second connecting piece, the two-force rod is vertically arranged, the two ends of the two-force rod are respectively hinged with the two U-shaped clamps through annular ends, and the fixed bottom plate is fixedly connected with the front end.

8. The automobile control arm endurance test rig according to claim 7, wherein: the top plate is provided with a plurality of threaded holes used for adjusting the positions of the auxiliary limiting mechanisms along the length direction and is connected with the screw rod.

9. The automobile control arm endurance test rig according to claim 7, wherein: the bottom of the U-shaped clamp is provided with a U-shaped clamp base bolt hole in the middle, two inner sides of the U-shaped clamp are symmetrically provided with two cylindrical connecting blocks at intervals, the centers of the two cylindrical connecting blocks coaxially penetrate through the U-shaped clamp end face bolt hole, the gap of the two cylindrical connecting blocks is matched with the thickness of the annular end, and the axis of the screw rod, the axis of the two-force rod, the center of the U-shaped clamp base bolt hole and the center of the central threaded hole of the second connecting piece are all on the same straight line.

10. The automobile control arm endurance test bed according to claim 1, wherein: the actuating cylinder comprises an actuating cylinder body, an actuating cylinder front lug fixedly arranged at the front end of the actuating cylinder body, an actuating cylinder base movably hinged at the rear end of the actuating cylinder body, and an actuating cylinder connecting plate fixedly connected to the actuating cylinder base, wherein a plurality of connecting plate bolt holes are uniformly formed in the actuating cylinder connecting plate, and a plurality of bolt holes are formed in the top of the actuating cylinder front lug; the actuating cylinder reaction frame comprises a reaction frame body, a reaction frame bottom plate and a plurality of reinforcing pieces, wherein the reaction frame bottom plate is fixedly arranged at the bottom of the reaction frame body, the reinforcing pieces are welded at the joint of the reaction frame body and the reaction frame bottom plate, and a plurality of groups of bolt holes matched with the bolt holes of the connecting plate are arranged on the reaction frame body to support the actuating cylinder and limit the position of the actuating cylinder.

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