Constant speed friction material test device

Abstract

A constant speed friction material test device belongs to the field of clutch parts inspection equipment. The purpose of the present invention is to adopt permanent magnet hub motor, semiconductor heating, cooling sheet, load sensor, torque sensor and other comprehensive technologies to directly measure friction force, so as to accurately measure the constant speed friction material test device of friction force. The present invention has a bottom beam fixedly installed on the base, four columns are fixedly installed on the bottom beam by bolts, and a cross beam is fixedly installed on the upper ends of the four columns by locking nuts; the cross beam is installed with a load measurement unit structure, and the bottom beam is installed with a friction disk operating mechanism. The present invention adopts a permanent magnet hub motor, so that the number of revolutions can be continuously adjusted, the operation interface is directly designed with value force, the operation is simplified, the torque sensor is used to directly measure the friction force, the circulating water refrigeration is eliminated, the use environment requirements are reduced, the pollutant emission is reduced, and the dust pollution to the operator and the environment is reduced. It has an automatic measurement function, improves work efficiency and reduces labor intensity.

Description

Technical Field

[0001] The invention belongs to the field of clutch parts inspection equipment. Background Art

[0002] With the development of the automobile industry, people have higher and higher requirements for the comfort and stability of automobile driving. As an important part of the automobile transmission system, the clutch has put forward higher requirements for the comprehensive performance of the clutch driven disc. The friction coefficient of the driven disc friction plate has an important influence on the performance of the clutch assembly. Since the engine torque is constant and the clutch cover assembly clamping force is fixed, if the friction between the driven disc and the cover assembly pressure plate is too small, if you want to keep the clutch assembly normal torque transmission, you need to increase the clutch cover assembly pressure plate clamping force, and you must increase the clutch cover assembly diaphragm spring clamping force and separation force, which will increase the diaphragm spring processing cost and affect driving comfort. Under the condition of fixed cover assembly clamping force, appropriately increasing the friction coefficient will increase the friction torque, so that the clutch cover assembly and the driven disc assembly are quickly synchronized, reducing the sliding film time and extending the service life of the clutch assembly. However, when the condition of fixed clutch cover assembly clamping force remains unchanged, if the friction coefficient of the driven disc is too large, the clutch assembly transmission pair will transmit torque too quickly, causing frustration, affecting the service life of the clutch assembly, and also affecting driving comfort. In addition, when the clamping force of the new and old clutch cover assemblies is fixed, the wear rate will affect the service life of the clutch assembly. It can be seen that the selection of friction plates with appropriate friction coefficients and smaller wear rates has a crucial impact on the performance of the clutch assembly and the vehicle. Therefore, how to select friction plates is particularly important for the design and qualification judgment of the clutch driven plate assembly.

[0003] At present, the common constant speed friction material testing machines are the Japanese HP-S constant speed friction testing machine and the XD-MSM constant speed friction material testing machine of Xianyang Friction Material Research Institute. This type of constant speed friction material testing machine has the following disadvantages:

[0004] 1. The equipment only has semi-automatic measurement function, which requires more operations;

[0005] 2. The equipment makes a lot of noise when it is running continuously;

[0006] 3. The tap water is circulated to dissipate heat, and the tap water consumption is relatively large. In addition, the friction material is discharged together with the tap water, causing environmental pollution;

[0007] 4. The equipment has only one friction temperature measuring thermocouple, and the temperature control and measurement accuracy is low;

[0008] 5. The electric heating tube and the friction disk are not tightly fitted, affecting the temperature control accuracy. Summary of the invention

[0009] The purpose of the present invention is to adopt permanent magnet hub motor, semiconductor heating, cooling sheet, load sensor, torque sensor and other comprehensive technologies to directly measure friction force, so as to provide a constant speed friction material test device capable of accurately measuring friction force.

[0010] The present invention has a bottom beam fixedly mounted on the base, four upright posts fixedly mounted on the bottom beam by bolts, and a cross beam fixedly mounted on the upper ends of the four upright posts by locking nuts;

[0011] The fixed shaft of the hub motor is fixedly mounted on the bottom beam through a fastening nut, a friction disc is mounted on the outer rotor of the hub motor through a fixedly mounted rotating transmission shaft, a torque sensor is mounted at the contact between the rotating transmission shaft and the friction disc, and a collector ring is mounted between the torque sensor and the outer rotor;

[0012] A reducer is fixedly installed on the crossbeam, the reducer is connected to the servo motor, the lead screw is connected to the reducer, the bottom end of the lead screw is connected to the load sensor fixing plate, both ends of the load sensor fixing plate are inserted on the balance bolts and fastened by the balance bolt locking nuts, the bottom end of the balance bolt is fixedly installed on the sample support plate, the balance bolt between the sample support plate and the load sensor fixing plate is provided with a load balance spring, a load sensor is installed in the middle part of the load sensor fixing plate, a cone is opened on the sample support plate corresponding to the middle part of the load sensor, and a steel ball is placed between the cone and the load sensor; a guide column is fixedly installed on the sample support plate, and the guide column is inserted on the crossbeam; the sample connection block is installed under the sample support plate and corresponds to the friction plate;

[0013] The structure of the friction disc: The friction disc includes an upper surface and a lower surface of the friction disc, which are connected by a plurality of support columns. A platinum resistor embedding point is provided on the surface of the upper surface of the friction disc at a position corresponding to the sample connection block, and a heating and cooling fin and a heat sink are installed on the inner surface of the upper surface of the friction disc;

[0014] Dust removal air inlets are installed on the left side, the right side and the rear side of the area formed by the four columns, and the dust collector is connected with the dust removal air inlets through a dust removal channel.

[0015] The present invention adopts a permanent magnet hub motor, so that the number of revolutions can be continuously adjusted, the operation interface is directly designed with value force, the operation is simplified, the friction force is directly measured by a torque sensor, circulating water refrigeration is eliminated, the requirements for the use environment are lowered, pollutant emissions are reduced, and dust pollution to operators and the environment is reduced. It has an automatic measurement function, improves work efficiency and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a partial enlarged view of the installation of the load sensor of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the friction disc of the present invention;

[0019] Figure 4 It is a circuit principle block diagram of the present invention;

[0020] Figure 5 It is the circuit diagram of the temperature controller of the present invention;

[0021] Figure 6 It is a DC power supply circuit diagram of the present invention;

[0022] Figure 7 It is the circuit diagram of the filter module of the present invention. DETAILED DESCRIPTION

[0023] In the present invention, a bottom beam 16 is fixedly installed on the base 15, and the base 15 and the bottom beam 16 constitute the support of the entire device. Four columns 21 are fixedly installed on the bottom beam 16 by bolts, and the four columns 21 surround a rectangular space. A cross beam 1 is fixedly installed on the upper ends of the four columns 21 by locking nuts 6; the cross beam 1 and the bottom beam 16 are both flat plates, the cross beam 1 covers the top of the rectangular space, and the bottom beam 16 covers the bottom of the rectangular space, and the other components of the present invention are all installed with the center of the upper and lower flat plates to ensure that the other components are placed inside the space surrounded by the four columns.

[0024] The fixed shaft 14 of the hub motor is fixedly mounted on the bottom beam 16 through a fastening nut 13, and a friction disc 9 is mounted on the outer rotor 12 of the hub motor through a fixedly mounted rotating transmission shaft 17, a torque sensor 10 is mounted at the contact point between the rotating transmission shaft 17 and the friction disc 9, and a collector ring 11 is mounted between the torque sensor 10 and the outer rotor 12; the hub motor is a structure with an axis as a stator (i.e., the fixed shaft 14), and its outer rotor 12 outputs power, which is driven by the rotation of the outer rotor 12 and the fixedly mounted friction disc 9, and the torque sensor 10 obtains torque force through rotation.

[0025] A reducer 3 is fixedly installed on the cross beam 1, the reducer 3 is connected to the servo motor 5, the lead screw 4 is connected to the reducer 3, the bottom end of the lead screw 4 is connected to the load sensor fixing plate 25, the two ends of the load sensor fixing plate 25 are inserted into the balance bolts 24, and are fastened by the balance bolt locking nuts 23, the bottom end of the balance bolt 24 is fixedly installed on the sample support plate 7, the balance bolt 24 between the sample support plate 7 and the load sensor fixing plate 25 is sleeved with a load balance spring 22, a load sensor 26 is installed in the middle part of the load sensor fixing plate 25, a cone 28 is opened on the sample support plate 7 corresponding to the middle part of the load sensor 26, and a steel ball 27 is placed between the cone 28 and the load sensor 26; a guide column 2 is fixedly installed on the sample support plate 7, and the guide column 2 is inserted into the cross beam 1; the sample connection block 8 is installed under the sample support plate 7 and corresponds to the friction plate 9; the servo motor 5 and the reducer 3 are the power mechanism of the lead screw 4, which is used to drive the lead screw 4 to move up and down. The screw 4 is used as a suspension rod that moves up and down, and all the mechanisms below it can move up and down until the sample connection block 8 contacts the upper surface of the friction disk 9. Three balancing bolts 24 evenly distributed at 120 degrees are fixed on the sample support disk 7. The other end of the balancing bolt 24 passes through three load balancing springs 22 and the load sensor fixing disk 25 and is pre-fixed by three balancing bolt locking nuts (balancing bolt locking nuts 23). The steel ball 27 is placed in the cone 28 of the sample support disk 7. The steel ball 27 is between the load sensor 26 and the sample support disk 7. The cone, steel ball and 9 load sensor cooperate to effectively eliminate the influence of torque on the load test accuracy. Adjust the three balancing bolt locking nuts so that the sample support disk transmits 10N force to the load sensor through the steel ball, and then continue to adjust the balancing locking nuts so that the sample support disk is parallel to the friction disk 9. The guide column 2 is a simple guide rod that can pass through the crossbeam 1 and move up and down. The gap of the hole left for the guide column 2 on the crossbeam 1 is as small as possible, so that the sample support plate 7 will not tilt when the screw 4 is driven up and down.

[0026] The structure of the friction disc 9: The friction disc 9 includes an upper surface 93 and a lower surface 95 of the friction disc. The upper surface 93 of the friction disc is connected to the lower surface 95 of the friction disc by a plurality of support columns 96. A platinum resistor embedding point 94 is provided on the surface of the upper surface 93 of the friction disc at a position corresponding to the sample connection block 8. A heating and cooling fin 92 and a heat sink 91 are installed on the inner surface of the upper surface 93 of the friction disc. The structure of the friction disc is as follows: Figure 3 Three embedded platinum resistors are evenly distributed at 120 degrees and embedded in the platinum resistor embedding points on the upper surface of the friction disk. Multiple sets of heating and cooling sheets are attached to the lower surface of the friction disk. Multiple sets of heat sinks are attached to the heating and cooling sheets and fixed to the lower surface of the friction disk. The upper surface of the friction disk and the lower surface of the friction disk are connected and fixed by evenly distributed support columns, and ventilation windows are formed between the support columns to dissipate heat.

[0027] Dust removal air inlets 18 are installed on the left, right and rear sides of the area formed by the four columns 21, and the dust collector 19 is connected to the dust removal air inlet 18 through the dust removal channel 20. When the friction disk rotates, the sample connection block 8 contacts and rubs against it, which will generate some dust, which may affect the detection results of the present invention. Therefore, the dust suction mechanism is installed on the left, right and rear sides. In addition to providing personnel operation equipment on the front side, the other three sides have dust suction mechanisms.

[0028] Electronic control system parts such as Figure 4 As shown in the block diagram of the electronic control system, all signal acquisition and control output of this system are completed by the computer, and the display completes the operation interface display. The RS232 interface board, RS485 interface board, and I / O card are all plugged into the computer motherboard. The load sensor and torque sensor are connected to the signal conditioning module. The load and torque signals are processed by the signal conditioning module and input into the data acquisition card for processing by the computer. The servo motor and encoder are connected to the servo driver. The control signal of the servo driver is connected to the RS232 interface board, and the computer controls it through the RS232 interface board. The hub motor is connected to the hub motor driver. The control signal of the hub motor is connected to the RS232 interface board, and the computer controls it through the RS232 interface board. Three platinum resistors are fixed on Figure 3 The platinum resistor is embedded in the point, and the signal end of the platinum resistor is connected to the temperature controller and processed into RS485 transmission signal, and then connected to the computer through the RS485 interface board for signal processing. The computer controls the heating, cooling control unit and dust removal control unit through the I / O card.

[0029] Temperature controller wiring Figure 5 As shown in the temperature controller, three platinum resistors are fixed at Figure 3 The platinum resistor is buried in the point, and the signal end of the platinum resistor is connected to the corresponding + and - poles of the temperature controller sensor input section CH1, CH2, and CH3 respectively. The power supply section DC24V+ and - are connected to the corresponding Figure 6 The DC power output terminal DC+ and - terminals complete the power supply of the temperature controller. The communication segment RS485 is connected to the + and - terminals of the half-duplex mode. Figure 4 9The signal line shield is grounded at the corresponding + and - terminals of the RS485 interface board.

[0030] DC power supply such as Figure 6 DC power supply, filtered AC 220V power supply Figure 7 L3 and L4 are connected to Figure 6The DC power supply T1 transformer input terminals U and N, and the output terminal of the T1 transformer are connected to the bridge circuit composed of diodes D1, D2, D3, and D4 to transmit DC voltage. The positive pole of the DC power is connected to the positive pole of the FU1 fuse and the C1 capacitor, and the negative pole of the DC power is connected to the negative pole of C1. Diodes D5, D6, integrated block LM317, capacitor C3, resistor R1, and potentiometer RP1 together form a DC power supply adjustment circuit. By adjusting the potentiometer RP1, the output end of the circuit reaches a stable DC 24V. The positive pole of the filter capacitor C2 is connected to 24V+, and the negative pole is connected to 24V- to make the DC 24V more stable.

[0031] Figure 7 It is a two-stage series low-pass filter module, L1 and L2 are the AC 220V input terminals, and L3 and L4 are the AC 220V output terminals after filtering. Figure 6 , Figure 7 It constitutes a DC 24V power supply module, which can suppress the electromagnetic interference between the line and the ground and output a smooth DC 24V to provide a good power supply for various electrical equipment.

[0032] When the present invention is used, the sample connection block 8 is first installed on the sample support plate 7, and then the load measurement unit structure is adjusted ( Figure 2 part), then turn on the servo motor 5, and drive the lead screw 4 to move downward through the reducer 3 until the sample connection block 8 contacts the friction disk 9. The contact force is determined according to the experimental requirements, and then start the hub motor, so that the friction disk 9 will rotate, and then the torque force and load force are collected by the torque sensor 10 and the load sensor 26 respectively, so that the friction coefficient of the sample connection block 8, that is, the friction rate, can be accurately calculated according to the existing calculation formula.

Claims

1. A constant speed friction material testing device, characterized in that: A bottom beam (16) is fixedly mounted on the base (15), four upright posts (21) are fixedly mounted on the bottom beam (16) by means of bolts, and a cross beam (1) is fixedly mounted on the upper ends of the four upright posts (21) by means of locking nuts (6); The fixed shaft (14) of the wheel hub motor is fixedly mounted on the bottom beam (16) via a fastening nut (13); a friction disk (9) is mounted on the outer rotor (12) of the wheel hub motor via a fixedly mounted rotating transmission shaft (17); a torque sensor (10) is mounted at the contact point between the rotating transmission shaft (17) and the friction disk (9); and a collector ring (11) is mounted between the torque sensor (10) and the outer rotor (12); A reducer (3) is fixedly mounted on the crossbeam (1). The reducer (3) is connected to the servo motor (5). A lead screw (4) is connected to the reducer (3). The bottom end of the lead screw (4) is connected to the load sensor fixing plate (25). Both ends of the load sensor fixing plate (25) are inserted into the balance bolts (24) and are fastened by the balance bolt locking nuts (23). The bottom end of the balance bolt (24) is fixedly mounted on the sample support plate (7). The balance bolts (24) between the sample support plate (7) and the load sensor fixing plate (25) are fixedly mounted on the crossbeam (1). ) is provided with a load balancing spring (22), a load sensor (26) is installed in the middle of the load sensor fixing plate (25), a cone opening (28) is opened on the sample support plate (7) corresponding to the middle of the load sensor (26), and a steel ball (27) is placed between the cone opening (28) and the load sensor (26); a guide column (2) is fixedly installed on the sample support plate (7), and the guide column (2) is inserted into the crossbeam (1); a sample connecting block (8) is installed under the sample support plate (7) and corresponds to the friction plate (9); The structure of the friction disk (9): the friction disk (9) comprises an upper surface (93) of the friction disk and a lower surface (95) of the friction disk. The upper surface (93) of the friction disk is connected to the lower surface (95) of the friction disk via a plurality of support columns (96). A platinum resistor embedding point (94) is provided on the surface of the upper surface (93) of the friction disk at a position corresponding to the sample connection block (8). A heating and cooling fin (92) and a heat sink (91) are installed on the inner surface of the upper surface (93) of the friction disk. Dust removal air inlets (18) are installed on the left side, right side and rear side of the area formed by the four columns (21), and the dust collector (19) is connected to the dust removal air inlet (18) through the dust removal channel (20).

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