Radial crushing test tool for drum brake

Abstract

The utility model relates to a radial crushing test tool for a drum brake, which is mounted on a universal material testing machine and comprises a base and a support plate, the support plate is vertically arranged and simulates a brake mounting surface of a real vehicle, and the support plate is provided with a turntable rotatably connected with the support plate and a cam hole positioning column, the universal material testing machine is perpendicular to the eccentric position of the turntable and is detachably connected with the turntable, the central hole positioning column is perpendicular to the central position of the turntable and is detachably connected with the turntable, a to-be-tested brake drum cover is pressed on the turntable, and the force application end of the universal material testing machine is matched and propped against the to-be-tested brake drum cover. The tool provided by the utility model can meet the radial crushing test of various phi110 drum-type slot brakes, is simple to operate, and can accurately record the instant moment of damage of the brakes.

Description

Technical Field

[0001] The utility model relates to the technical field of brake testing tooling, in particular to a drum brake radial crushing testing tooling. Background Art

[0002] The braking performance of an electric vehicle plays a crucial role in protecting the lives of its users. As a key component of an electric vehicle's braking system, the brakes ensure reliable deceleration and stopping of the vehicle under various driving conditions and emergency situations, ensuring safe driving.

[0003] Drum brakes consist of a brake drum, control shoe, brake rocker arm, camshaft, and return spring. When the driver operates the brake handle, the rocker arm drives the camshaft, pushing the brake shoe outward, contacting the inner wall of the brake drum, generating friction, and thus achieving the braking effect. The drum brake crush strength test is a critical test for evaluating the structural strength and safety performance of brakes when subjected to external forces. This test ensures that the brake structure will remain intact and will not fail in extreme situations such as emergency braking or collisions, thereby ensuring the safety of the rider.

[0004] At present, there are many types of drum brakes in the industry, and the initial design of the crushing fixture did not take comprehensive considerations into account. It is more specialized and less universal. When there are many types of drum brakes to be tested, the fixture needs to be frequently disassembled and assembled, which brings many inconveniences to daily testing and tooling management. Utility Model Content

[0005] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a drum brake radial crushing test fixture with a reasonable structure, which can be applied to the detection of drum brakes of various specifications. There is no need to replace the fixture back and forth during testing, thereby improving the testing efficiency.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] A drum brake radial crush test fixture is installed on a universal material testing machine and includes a base and a support plate. The support plate is vertically arranged to simulate the brake mounting surface of a real vehicle.

[0008] The support plate is equipped with:

[0009] The turntable is rotatably connected to the support plate.

[0010] The cam hole positioning column is perpendicular to the eccentric position of the turntable and is detachably connected to the turntable.

[0011] The center hole positioning column is perpendicular to the center of the turntable and is detachably connected to the turntable.

[0012] The brake drum cover to be tested is press-fitted onto the turntable, and the force-applying end of the universal material testing machine is in contact with the brake drum cover to be tested.

[0013] As a further improvement of the above technical solution:

[0014] A supporting angle steel is connected between the base and the supporting plate. Fasteners are arranged on the supporting angle steel. Two walls of the supporting angle steel are respectively connected to the base, the universal material testing machine and the supporting plate.

[0015] The relative position between the base and the workbench of the universal material testing machine is adjustable.

[0016] The circumferential position array of the turntable is provided with fastening bolts.

[0017] The turntable can rotate from 0 to 120 degrees and can be rotated forward and reverse.

[0018] The ends of the cam hole locating column and the center hole locating column facing away from the turntable are both equipped with locking nuts.

[0019] The axial length of the cam hole locating column and the center hole locating column used to assemble the brake drum cover to be tested is determined by the connection length between the lock nut and the cam hole locating column, the center hole locating column itself and the turntable.

[0020] The distance from the center of the indenter to the center of the brake drum cover to be tested is consistent with the distance between the force point and the center of the drum cover when the brake components are actually installed on the vehicle.

[0021] The support plate is arranged close to the center line of the base.

[0022] During the test, the indenter applies a vertical downward load to the notch of the brake drum cover to be tested.

[0023] The beneficial effects of the utility model are as follows:

[0024] This fixture has a simple installation process and is compatible with the industry's mainstream Φ110 drum-type slot brakes. It can meet the radial crushing tests of various Φ110 drum-type slot brakes, such as front, rear, left, and right drum-type slot brakes. It improves user convenience and improves test efficiency.

[0025] The tensile data during the test can be recorded in conjunction with other recording equipment, and its instantaneous failure force can be accurately recorded. When the maximum tensile force is reached, the equipment can monitor it, and when the aging value is reached, the equipment will stop the test immediately. Such tooling can accurately observe and record the tensile diagram.

[0026] The tooling has low manufacturing cost, is reusable, and has high test assembly stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0028] Figure 2 This is a schematic structural diagram of the cooperation between the crushing tool and the pressing head of the utility model.

[0029] Figure 3 This is a schematic diagram of the crushing tooling of the present invention, in which the test piece is hidden.

[0030] Figure 4 This is an exploded view of the crushing tooling of the present invention.

[0031] Figure 5 This is a schematic diagram of the state where the test piece has just been installed during the actual test process.

[0032] Figure 6 For Figure 5 Schematic diagram of the base slot being adjusted to a horizontal state.

[0033] Including: 1. Universal material testing machine; 2. Base; 3. Support plate; 4. Support angle steel; 5. Turntable; 6. Fastening bolts; 7. Cam hole positioning column; 8. Center hole positioning column; 9. Lock nut; 10. Slot notch;

[0034] 101. Press head; 102. T-slot platform. DETAILED DESCRIPTION

[0035] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0036] like Figures 1-6 As shown, the drum brake radial crush test fixture of this embodiment is installed on a universal material testing machine 1, including a base 2 and a support plate 3. The support plate 3 is vertically arranged to simulate the brake installation surface of a real vehicle.

[0037] The support plate 3 is provided with:

[0038] The turntable 5 is rotatably connected to the support plate 3.

[0039] The cam hole positioning column 7 is perpendicular to the eccentric position of the turntable 5 and is detachably connected to the turntable 5.

[0040] The center hole positioning column 8 is perpendicular to the center of the turntable 5 and is detachably connected to the turntable 5.

[0041] The brake drum cover to be tested is press-fitted onto the turntable 5 , and the force-applying end of the universal material testing machine 1 is in contact with the brake drum cover to be tested.

[0042] A supporting angle steel 4 is connected between the base 2 and the supporting plate 3 . Fasteners are arranged on the supporting angle steel 4 . Two walls of the supporting angle steel 4 are respectively connected to the base 2 , the universal material testing machine 1 , and the supporting plate 3 .

[0043] The relative position between the base 2 and the workbench of the universal material testing machine 1 is adjustable.

[0044] Fastening bolts 6 are provided at an array of circumferential positions of the turntable 5 .

[0045] The rotation range of the turntable 5 is 0-120°, and it can rotate forward and reverse.

[0046] The ends of the cam hole positioning column 7 and the center hole positioning column 8 facing away from the turntable 5 are both equipped with locking nuts 9.

[0047] The axial length of the cam hole positioning column 7 and the center hole positioning column 8 for assembling the brake drum cover to be tested is determined by the connection length between the locking nut 9 and the cam hole positioning column 7, the center hole positioning column 8 and the turntable 5.

[0048] The distance from the center of the pressure head 101 to the center of the brake drum cover to be tested is consistent with the distance between the force point and the center of the drum cover when the brake components are actually installed on the vehicle and in a mating state.

[0049] The support plate 3 is arranged close to the center line of the base 2 .

[0050] During the test, the indenter 101 applies a vertical downward load to the notch of the brake drum cover to be tested.

[0051] The specific structure and working process of the utility model are as follows:

[0052] like Figure 1 As shown, the entire test device includes a universal material testing machine and an indenter connected to the universal material testing machine. The improvement of the present invention is that a crush test fixture is provided on the T-slot platform of the universal material testing machine for mounting the brake drum cover to be tested.

[0053] like Figure 2 and Figure 3 As shown, the crush test fixture includes a base and a support plate. The base is fixed on the T-slot platform by bolts, the support plate is perpendicular to the T-slot platform, and the brake drum cover to be tested is flatly installed on the vertical plate.

[0054] A through slot is provided near the base of the support plate, and a supporting angle steel is connected to the slot by bolts. The supporting angle steel is right-angled, with one end flat on the support plate and the other flat on the base. At the same time, it is limited by the bolts on the base, which serves to improve the strength of the tooling.

[0055] A turntable is provided on the support plate and is arranged parallel to the support plate. A cam hole positioning column and a center hole positioning column are provided on the turntable. The ends of the cam hole positioning column and the center hole positioning column are both equipped with locking nuts.

[0056] The locking nut is detachable, and the brake drum cover to be tested is sleeved on the cam hole positioning column and the center hole positioning column; the ends of the cam hole positioning column and the center hole positioning column facing away from the locking nut are also threadedly connected to the turntable, and the cam hole positioning column and the center hole positioning column on the support plate can be replaced according to actual working conditions.

[0057] Since the cam hole locating column, the center hole locating column and the turntable are threadedly connected, the relative position relationship between the cam hole locating column, the center hole locating column and the turntable is adjustable, that is, the axial clearance of the center hole between the brake drum cover to be tested and the turntable can be adjusted by adjusting the axial length of the threaded fitting section, and then the brake drum cover to be tested can be fully limited by tightening the appropriate locking nut.

[0058] Combined with reference Figure 4 Fastening bolts are installed between the support plate and the turntable. When these bolts are released, the turntable can drive the brake drum cover under test, causing it to rotate relative to the support plate. This rotation is achieved by three circumferentially arranged arcuate slots in the support plate, which define the turntable's rotation path and angle.

[0059] Before testing a certain specification of brake drum cover, the following preparations need to be done:

[0060] Put the brake drum cover to be tested on the cam hole positioning column and the center hole positioning column to fix it, then loosen the fastening bolts between the support plate and the turntable, and rotate the turntable to make the slot of the brake drum cover to be tested in a horizontal state.

[0061] Loosen the bolts on the base and adjust the distance between the center of the brake drum cover to be tested and the center of the indenter. The distance should be consistent with the distance of the actual position of the parts in the vehicle. Then tighten the bolts on the base, set the parameters of the universal material testing machine, and start the crushing test.

[0062] Combined with reference Figure 5 and Figure 6During the test, one end of the indenter is connected to the crossbeam mounting column of the universal material testing machine, and the other end is inserted into the slot of the installed brake drum cover to be tested. The position of the crushing test fixture on the T-slot platform is adjusted to ensure that the distance from the center of the indenter to the center of the brake drum cover to be tested is consistent with the distance between the force point and the center of the drum cover when the brake components are actually installed on the vehicle, that is, the working conditions during actual driving are simulated; then the universal material testing machine drives the indenter to apply a vertical downward load to the slot notch 10 of the brake drum cover to be tested to complete the application of the test torque, simulating the torque load that the drum brake bears during braking, until the brake drum cover to be tested breaks or other damage occurs. The force at the moment of damage is the critical value.

[0063] The advantage of this utility model lies in the addition of a turntable structure to conventional tooling, which can adapt to different specifications of brake drum covers to be tested, including the mainstream Φ110 drum slot brake in the industry. There are many types of drum brakes in the industry: front-mounted and rear-mounted according to front and rear wheel installation; left-mounted and right-mounted according to left and right side installation; Φ16, Φ14, Φ12, and Φ10 center holes, and Φ14 and Φ12 cam holes according to national standard vehicles and electric motorcycles; and front shock absorbers that match the front brakes. Different styles of front shock absorbers have different installation size chains, resulting in a wide variety of Φ110 slot drum brake specifications. Different sizes of slot brakes have different slot angles and different center hole and cam hole diameters, which brings many inconveniences to radial crush testing of slot drum brakes. The adaptability of this tooling improves user convenience, improves test efficiency, and reduces the tedious tooling fixture replacement and tooling management work.

[0064] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A drum brake radial crush test fixture, mounted on a universal material testing machine (1), characterized in that: It comprises a base (2) and a support plate (3), wherein the support plate (3) is vertically arranged to simulate the brake mounting surface of a real vehicle. The support plate (3) is provided with: The turntable (5) is rotatably connected to the support plate (3). The cam hole positioning column (7) is perpendicular to the eccentric position of the turntable (5) and is detachably connected to the turntable (5). The center hole positioning column (8) is perpendicular to the center position of the turntable (5) and is detachably connected to the turntable (5). The brake drum cover to be tested is pressed onto the turntable (5). The force-applying end of the universal material testing machine (1) is in contact with the brake drum cover to be tested.

2. The drum brake radial crush test fixture according to claim 1, characterized in that: A supporting angle steel (4) is connected between the base (2) and the supporting plate (3), and a fastener is arranged on the supporting angle steel (4). Two walls of the supporting angle steel (4) are respectively connected to the base (2), the universal material testing machine (1), and the supporting plate (3).

3. The drum brake radial crush test fixture according to claim 1, characterized in that: The relative position between the base (2) and the workbench of the universal material testing machine (1) is adjustable.

4. The drum brake radial crush test fixture according to claim 1, characterized in that: The circumferential position array of the turntable (5) is provided with fastening bolts (6).

5. The drum brake radial crush test fixture according to claim 4, characterized in that: The rotating range of the turntable (5) is 0-120 degrees, and it can rotate forward and reverse.

6. The drum brake radial crush test fixture according to claim 1, characterized in that: The ends of the cam hole positioning column (7) and the center hole positioning column (8) facing away from the turntable (5) are both equipped with locking nuts (9).

7. The drum brake radial crush test fixture according to claim 6, characterized in that: The axial length of the cam hole positioning column (7) and the center hole positioning column (8) for assembling the brake drum cover to be tested is determined by the connection length between the locking nut (9) and the cam hole positioning column (7), the center hole positioning column (8) and the turntable (5).

8. The drum brake radial crush test fixture according to claim 1, characterized in that: The distance between the center of the pressure head (101) and the center of the brake drum cover to be tested is consistent with the distance between the force point and the center of the drum cover when the brake components are actually installed on the vehicle.

9. The drum brake radial crush test fixture according to claim 1, characterized in that: The support plate (3) is arranged close to the center line of the base (2).

10. The drum brake radial crush test fixture according to claim 1, characterized in that: During the test, the pressure head (101) applies a vertical downward load to the clamping notch (10) of the brake drum cover to be tested.

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