A gear shifting test mechanism and test method for a gearbox automatic test bench

Abstract

A gear shift test mechanism for an automatic gearbox test bench comprises: a drive shaft system for driving gear shift; a torque sensor (1) and an encoder are arranged on the drive shaft system. The corresponding test method comprises the following steps: fixing the tested part, respectively operating the drive shaft system and the gear shift drive system, driving the gear shift fork to rotate to the theoretical zero gear; disconnecting the gear shift drive system from the gear shift fork; docking the gear shift fork with the gear shift rocker arm of the tested part; and completing the measurement and determination of the real-time gear shift force and the actual angle of each gear position by means of the torque sensor provided in combination with the encoder provided. The gear shift test mechanism and test method for an automatic gearbox test bench of the present invention ensure that the gear shift rocker arm of the tested part can return to the correct position of each gear position during the test, while achieving simultaneous and accurate testing of the gear shift force and the gear shift angle.

Description

Technical Field

[0001] The invention belongs to the field of automobile gearbox testing, and in particular relates to a gear shift testing mechanism and a testing method for a gearbox automatic test bench. Background Art

[0002] During the test of the automobile transmission, the transmission needs to be shifted (the red rocker arm shown in the figure is turned to PRND and other gears). The currently commonly used automatic shifting structure can only simply shift directly from P gear to D gear, detect the size of the entire shifting force, or judge whether the corresponding gear has been engaged after shifting to a fixed angle, and cannot accurately test the shifting force and shifting angle at the same time; and because the actual shifting angle of each transmission is different from the theoretical shifting angle, the existing structure cannot test the accurate actual shifting angle, and the shifting rocker arm cannot return to the correct position of each gear when the transmission is loaded.

[0003] The invention application with application number: 201310625135.2 discloses "a gearbox automatic shifting test device", including a gantry, a guide rail base plate is provided on the gantry, a linear guide rail module, an electrical control box and an electric cylinder are fixedly provided on the guide rail base plate; a gear shifting support plate device is provided on the linear guide rail module, and the gear shifting support plate device is fixedly mounted on the linear guide rail module by a rotating clamping device; a telescopic sleeve is provided below the guide support, a shift ball head is provided below the telescopic sleeve, a force sensor is fixedly connected to the shift ball head below, and a shift tooling is fixedly connected to the force sensor below.

[0004] The invention application with application number: 201821118121.6 discloses "a test bench gear shift test actuator", including a base, a dual-axis linear robot, a linear displacement sensor, a cylinder, a three-axis force sensor and a flexible coupling sleeve. The dual-axis linear robot is installed above the base and has guide rails in two directions of the X-axis and the Y-axis. The slider on the guide rail is controlled by a servo motor at the tail to realize linear motion in the X-axis or Y-axis direction, and the guide rail in the Y-axis direction extends out of the base. There are two linear displacement sensors, which are respectively installed on the sides of the guide rails in two directions of the dual-axis linear robot and are arranged parallel to them. The cylinder is installed on the Y-axis slider of the dual-axis linear robot to realize the up and down movement of the vertical Z-axis. The flexible coupling sleeve is mounted on the shift handle, and the upper end is connected to the telescopic rod of the cylinder through a three-axis force sensor. The dual-axis linear robot and the cylinder simulate the movement in three directions to realize the shift operation, and the three-axis force sensor is used to detect the forces in three directions.

[0005] The invention application with application number: 201811193893.0 discloses "a high-efficiency automatic gear shift testing mechanism", including a gear shift simulation mechanism and a collision simulation mechanism, the gear shift simulation mechanism includes an interlocking seat, a drive shaft, an intermediate finger groove, a first and second gear bumper and a third and fourth gear bumper, the drive shaft is sleeved with the interlocking seat, the interlocking seat is provided with the intermediate finger groove, and both ends of the drive shaft are connected to the collision simulation mechanism; the collision simulation mechanism includes a concave bumper, a guide sleeve, an adapter sleeve, a damper, a shaft joint and a rotating electromagnet, the guide sleeve is sleeved on the concave bumper, the concave bumper is connected to the damper, the front part of the damper is sleeved with the adapter sleeve, the rotating electromagnet is connected to the rear part of the damper through the shaft joint, and the concave bumper is provided with a groove. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a gear shift test mechanism and test method for a gearbox automatic test bench, and the technical solution thereof is as follows:

[0007] A gear shift test mechanism for a gearbox automatic test bench, characterized by comprising:

[0008] A drive shaft system for driving gear shifting;

[0009] A torque sensor (1) and an encoder are provided on the driving shaft system.

[0010] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0011] The drive shaft is connected to a shift fork (2) via a clutch;

[0012] The clutch includes an upper shaft connected to the drive shaft and a lower shaft connected to the shift fork.

[0013] The upper shaft system and the lower shaft system are respectively fixedly supported by the provided fixed support parts;

[0014] A positioning guide structure is provided on the fixed support portion.

[0015] The clutch completes the fixed support of the upper shaft system and the lower shaft system and the positioning and guiding structure required for the coaxial formation between the two through the fixed support part and the positioning and guiding structure provided by the clutch;

[0016] On the basis of the above, a clutch part is provided on the lower end shaft system which can move relative to the upper end shaft system;

[0017] A clutch relationship between the upper end shaft system and the lower end shaft system is established by a clutch portion that can form relative motion relative to the upper end shaft system.

[0018] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0019] The gear shift testing mechanism also includes: a gear shift drive system,

[0020] The shift fork (2) is arranged on the drive shaft system.

[0021] The gear shift drive system and the gear shift fork (2) form a structural setting relationship in which they are engaged during gear shifting operations and disengaged during non-gear shifting operations.

[0022] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0023] The clutch portion is driven by the drive shaft system to move axially in a rotatable manner relative to the drive shaft system.

[0024] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0025] A lower end encoder (3) is provided on the lower end shaft system.

[0026] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0027] The gear shift drive system is driven by a cylinder (4);

[0028] A docking shift fork (5) connected to and driven by the cylinder and matched with the shift fork (1) is provided.

[0029] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0030] A guide piece is provided at the end of the shift fork (2);

[0031] A guide notch is provided at the end of the guide member;

[0032] The shift fork (2) cooperates with the shift rocker arm (6) of the tested part through the guide notch of the provided guide part.

[0033] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0034] The drive shaft system and the gear shift drive system are both provided with fixed supports;

[0035] The fixed support and the fixed support part of the clutch are arranged integrally or separately.

[0036] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0037] The drive shaft system is provided with a drive shaft.

[0038] The shift fork (2) and the drive shaft are key-matched; and the shift fork (2) is provided with a return spring;

[0039] The return spring cooperates with the gear shift drive system.

[0040] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0041] An upper shaft (7) is provided on the upper shaft system;

[0042] A docking shaft (8) is provided at the lower end of the shaft system;

[0043] The upper end shaft (7) and the docking shaft (8) are coaxially arranged;

[0044] The clutch unit includes:

[0045] a pneumatically propelled piston (9),

[0046] The friction disc (10) moves with the piston drive,

[0047] A return spring (11) is arranged at the shaft end of the docking shaft and can reset the friction disc (10) and the piston (9);

[0048] The piston (9) is axially movable on the fixed support portion;

[0049] The friction disc (10) is movably arranged on the docking shaft (8) in the axial direction.

[0050] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0051] The piston (9) is connected to the friction disk (10) via a thrust bearing (12).

[0052] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0053] The positioning guide structure includes:

[0054] A first positioning bearing (13) is arranged on the fixed support portion and establishes a positioning guide for the upper end shaft system;

[0055] A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system;

[0056] By matching the first positioning bearing (13) with the second positioning bearing and combining with the fixed support part, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established.

[0057] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0058] The fixed support portion comprises:

[0059] A first mounting seat (14) for fixedly supporting the upper end shaft system;

[0060] A second mounting seat (15) for supporting the lower shaft system,

[0061] and

[0062] A connecting rod is used to connect the first mounting seat (14) and the second mounting seat (15).

[0063] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0064] The positioning guide structure includes:

[0065] A first positioning bearing (13) is arranged on the fixed support portion and establishes a positioning guide for the upper end shaft system;

[0066] A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system;

[0067] By cooperating the first positioning bearing (13) with the second positioning bearing and combining with the fixed support part, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established;

[0068] The second locating bearing comprises:

[0069] An end bearing (16) provided at the end of the butt shaft (8)

[0070] and

[0071] A support bearing (17) is sleeved on the docking shaft (8) and fixedly mounted on the fixed support portion.

[0072] A gear shift testing mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0073] The mounting hole for mounting the piston (9) and the mounting hole for mounting the support bearing (17) are coaxial;

[0074] Through coaxial installation, the piston drives the friction disc to fit the axial surface of the drive shaft to form an auxiliary positioning guide.

[0075] A gear shift testing mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0076] A friction plate (18) is provided on the friction disc (10).

[0077] A gear shift test mechanism for a gearbox automatic test bench according to the present invention is characterized in that:

[0078] The friction disc (10) and the docking shaft (8) are in rectangular spline fit.

[0079] A gear shift test method for a gearbox automatic test bench, the test method is completed by driving a gear shift fork (2) to rotate to different gear positions and docking with a gear shift rocker arm (6) of a test piece at different gear positions, the gear shift fork (2) being driven to rotate by a drive shaft system and driven to shift by a gear shift drive system, and is characterized by comprising the following steps:

[0080] S1: The tested object is fixed, and the drive shaft system and the gear shift drive system are respectively operated to drive the gear shift fork (2) to rotate to the theoretical zero position;

[0081] S2: disconnecting the gear shift drive system from the gear shift fork (2);

[0082] S3: the shift fork (2) is connected to the shift rocker arm (6) of the tested part;

[0083] S4: The torque sensor (1) is used in conjunction with the encoder to measure and determine the real-time shift force and the actual angle of each gear.

[0084] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0085] The shift fork (2) is directly driven by a drive shaft system, and a servo motor and a drive shaft are provided on the drive shaft system.

[0086] The encoder is arranged in the servo motor.

[0087] The torque sensor (1) is arranged on the drive shaft.

[0088] The specific step S4 is as follows:

[0089] The torque sensor captures the shift force at the moment when each gear is engaged;

[0090] The encoder cooperates with the shift force curve to read and determine the actual angle of each gear.

[0091] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0092] The gear shift drive system is driven by a cylinder (4);

[0093] A docking fork (5) connected to and driven by the cylinder and cooperating with the shift fork (2);

[0094] The step S2 is specifically implemented by the following operations: the cylinder drives the docking fork (5) to move, thereby disengaging the docking fork (5) from the shift fork (2).

[0095] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0096] A guide piece is provided at the end of the shift fork (2);

[0097] A guide notch is provided at the end of the guide member;

[0098] The shift fork (2) cooperates with the shift rocker arm (6) of the tested part through the guide notch of the provided guide part.

[0099] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0100] The drive shaft system is provided with a drive shaft.

[0101] The shift fork (2) and the drive shaft are key-matched; and the shift fork (2) is provided with a return spring;

[0102] The return spring cooperates with the shift drive system; specifically, the shift fork (2) in step S3 moves downward to the docking position under the action of the return spring and docks with the shift rocker arm (6) of the tested component.

[0103] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0104] The drive shaft system is connected to the shift fork through a clutch, the clutch comprises an upper shaft system and a lower shaft system, a lower encoder (3) is arranged on the lower shaft system, and the shift fork (2) is arranged on the lower shaft system;

[0105] The specific step S1 is as follows:

[0106] The tested object is fixed, the clutch is engaged, the drive shaft system and the shift drive system are respectively activated, and the shift fork (1) is driven to rotate to the zero position of the lower end encoder (i.e. the theoretical initial angle);

[0107] The specific step S4 is as follows:

[0108] S41: The clutch is disengaged, and the shift fork returns to the initial angle under the action of the resilience of the shift rocker arm (6) of the tested part; the lower end encoder (3) reads the angle at this moment and records it as the actual initial angle;

[0109] S42: The clutch is engaged, the drive shaft system and the gear shift drive system are respectively actuated to drive the gear shift fork (2) to rotate to the theoretical angle of the next gear position;

[0110] S43: disconnecting the gear shift drive system from the gear shift fork (2);

[0111] S44: the shift fork (2) is connected to the shift rocker arm (6) of the tested part;

[0112] S45: the clutch is disengaged, and the shift fork returns to the actual second gear position angle under the action of the resilience of the shift rocker arm (2) of the tested part; the lower end encoder (3) reads the angle at this moment and records it as the actual second gear position angle;

[0113] S46: The real-time shift force during the rotation from the initial gear position to the second gear position is read through the torque sensor (1) in combination with the lower end encoder (3).

[0114] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0115] A clutch part is provided on the lower end shaft system and can move relative to the upper end shaft system;

[0116] A clutching relationship between the upper shaft system and the lower shaft system is established by a clutch part that can form relative motion with respect to the upper shaft system;

[0117] An upper shaft (7) is provided on the upper shaft system;

[0118] A docking shaft (8) is provided at the lower end of the shaft system;

[0119] The upper end shaft (7) and the docking shaft (8) are coaxially arranged;

[0120] The clutch unit includes:

[0121] a pneumatically propelled piston (9),

[0122] The friction disc (10) moves with the piston drive,

[0123] A return spring (11) is arranged at the shaft end of the docking shaft and can reset the friction disc (10) and the piston (9);

[0124] The piston (9) is axially movable on the fixed support portion;

[0125] The friction disc (10) is movably arranged on the docking shaft (8) in the axial direction;

[0126] The pneumatic propulsion piston (9) moves, driving the friction plate (10) to dock with the upper shaft (7), thereby establishing the clutch engagement;

[0127] The clutch is disengaged by the return movement of the return spring (11) without pneumatic propulsion.

[0128] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0129] The upper shaft system and the lower shaft system are respectively fixedly supported by the provided fixed support parts;

[0130] A positioning guide structure is provided on the fixed support portion.

[0131] The clutch completes the fixed support of the upper shaft system and the lower shaft system and the positioning and guiding required for forming the coaxiality between the two through the fixed support part and the positioning and guiding structure arranged by the clutch.

[0132] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0133] The piston (9) is connected to the friction disk (10) via a thrust bearing (12).

[0134] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0135] The positioning guide structure includes:

[0136] A first positioning bearing (13) is arranged on the fixed support portion and establishes a positioning guide for the upper end shaft system;

[0137] A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system;

[0138] By cooperating the first positioning bearing (13) with the second positioning bearing and combining with the fixed support part, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established;

[0139] The second locating bearing comprises:

[0140] An end bearing (16) provided at the end of the butt shaft (8)

[0141] and

[0142] A support bearing (17) is sleeved on the docking shaft (8) and fixedly mounted on the fixed support portion.

[0143] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0144] The fixed support portion comprises:

[0145] A first mounting seat (14) for fixedly supporting the upper end shaft system;

[0146] A second mounting seat (15) for supporting the lower shaft system,

[0147] and

[0148] A connecting rod is used to connect the first mounting seat (14) and the second mounting seat (15).

[0149] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0150] The mounting hole for mounting the piston (9) and the mounting hole for mounting the support bearing (17) are coaxial;

[0151] Through coaxial installation, the piston drives the friction disc to fit the axial surface of the drive shaft to form an auxiliary positioning guide.

[0152] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0153] A friction plate (18) is provided on the friction disc (10).

[0154] A gear shifting test method for a gearbox automatic test bench according to the present invention is characterized in that:

[0155] The friction disc (10) and the docking shaft (8) are in rectangular spline fit.

[0156] The present invention provides a gear shift test mechanism and test method for a gearbox automatic test bench. The measurement of the gear shift force and the gear shift angle is established by means of a torque sensor and an encoder. The setting ensures that the gear shift rocker arm of the tested part can return to the correct position of each gear position during the test. To improve the measurement accuracy, a setting is established for the gear shift fork and the gear shift drive system that drives the gear shift fork to shift gears, which is engaged during gear shifting operation and disengaged during non-gear shifting operation. Furthermore, a clutch that can be directly disengaged and engaged is established between the drive shaft system and the gear shift fork. Through a series of settings and coordination, a gear shift test mechanism is finally established that can solve the problem of deviation between the actual gear shift angle and the theoretical gear shift angle in the prior art, and can realize simultaneous and accurate testing of the gear shift force and the gear shift angle, and can realize that the gear shift rocker arm of the tested part can return to the correct position of each gear position when the gearbox is loaded and tested. The measurement accuracy is guaranteed from all angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0157] Figure 1 It is a schematic diagram of the steps of the present invention;

[0158] Figure 2 The clutch is provided in the present invention. Figure 1 A schematic diagram of step S4;

[0159] Figure 3 It is a schematic diagram of the structure of the testing mechanism of the present invention;

[0160] Figure 4It is a structural schematic diagram of an embodiment of the present invention;

[0161] Figure 5 It is a schematic diagram of the clutch structure in the present invention.

[0162] In the figure,

[0163] 1-Torque sensor;

[0164] 2-Shift fork;

[0165] 3-Cylinder

[0166] 4-lower encoder;

[0167] 5- docking fork;

[0168] 6-Tested gear shift rocker arm;

[0169] 7- upper end shaft;

[0170] 8- docking shaft;

[0171] 9-Piston;

[0172] 10- friction disc;

[0173] 11-return spring;

[0174] 12-Thrust bearing;

[0175] 13-first locating bearing;

[0176] 14- first mounting seat;

[0177] 15- second mounting seat;

[0178] 16-end bearing;

[0179] 17-support bearing;

[0180] 18-Friction plate. DETAILED DESCRIPTION

[0181] Below, a gear shifting test mechanism and a test method for a gearbox automatic test bench of the present invention are further specifically described according to the accompanying drawings and specific implementation methods of the specification.

[0182] like Figure 3 The gear shift test mechanism for a gearbox automatic test bench shown in the figure is characterized by comprising:

[0183] A drive shaft system for driving gear shifting;

[0184] A torque sensor (1) and an encoder are provided on the driving shaft system.

[0185] in,

[0186] The drive shaft is connected to a shift fork (2) via a clutch;

[0187] The clutch includes an upper shaft connected to the drive shaft and a lower shaft connected to the shift fork.

[0188] The upper shaft system and the lower shaft system are respectively fixedly supported by the provided fixed support parts;

[0189] A positioning guide structure is provided on the fixed support portion.

[0190] The clutch completes the fixed support of the upper shaft system and the lower shaft system and the positioning and guiding structure required for the coaxial formation between the two through the fixed support part and the positioning and guiding structure provided by the clutch;

[0191] On the basis of the above, a clutch part is provided on the lower end shaft system which can move relative to the upper end shaft system;

[0192] A clutch relationship between the upper end shaft system and the lower end shaft system is established by a clutch portion that can form relative motion relative to the upper end shaft system.

[0193] in,

[0194] The gear shift testing mechanism also includes: a gear shift drive system,

[0195] The shift fork (2) is arranged on the drive shaft system.

[0196] The gear shift drive system and the gear shift fork (2) form a structural setting relationship in which they are engaged during gear shifting operations and disengaged during non-gear shifting operations.

[0197] in,

[0198] The clutch portion is driven by the drive shaft system to move axially in a rotatable manner relative to the drive shaft system.

[0199] in,

[0200] A lower end encoder (3) is provided on the lower end shaft system.

[0201] in,

[0202] The gear shift drive system is driven by a cylinder (4);

[0203] A docking shift fork (5) connected to and driven by the cylinder and matched with the shift fork (1) is provided.

[0204] in,

[0205] A guide piece is provided at the end of the shift fork (2);

[0206] A guide notch is provided at the end of the guide member;

[0207] The shift fork (2) cooperates with the shift rocker arm (6) of the tested part through the guide notch of the provided guide part.

[0208] in,

[0209] The drive shaft system and the gear shift drive system are both provided with fixed supports;

[0210] The fixed support and the fixed support part of the clutch are arranged integrally or separately.

[0211] in,

[0212] The drive shaft system is provided with a drive shaft.

[0213] The shift fork (2) and the drive shaft are key-matched; and the shift fork (2) is provided with a return spring;

[0214] The return spring cooperates with the gear shift drive system.

[0215] in,

[0216] An upper shaft (7) is provided on the upper shaft system;

[0217] A docking shaft (8) is provided at the lower end of the shaft system;

[0218] The upper end shaft (7) and the docking shaft (8) are coaxially arranged;

[0219] The clutch unit includes:

[0220] a pneumatically propelled piston (9),

[0221] The friction disc (10) moves with the piston drive,

[0222] A return spring (11) is arranged at the shaft end of the docking shaft and can reset the friction disc (10) and the piston (9);

[0223] The piston (9) is axially movable on the fixed support portion;

[0224] The friction disc (10) is movably arranged on the docking shaft (8) in the axial direction.

[0225] in,

[0226] The piston (9) is connected to the friction disk (10) via a thrust bearing (12).

[0227] in,

[0228] The positioning guide structure includes:

[0229] A first positioning bearing (13) is arranged on the fixed support portion and establishes a positioning guide for the upper end shaft system;

[0230] A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system;

[0231] By matching the first positioning bearing (13) with the second positioning bearing and combining with the fixed support part, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established.

[0232] in,

[0233] The fixed support portion comprises:

[0234] A first mounting seat (14) for fixedly supporting the upper end shaft system;

[0235] A second mounting seat (15) for supporting the lower shaft system,

[0236] and

[0237] A connecting rod is used to connect the first mounting seat (14) and the second mounting seat (15).

[0238] in,

[0239] The positioning guide structure includes:

[0240] A first positioning bearing (13) is arranged on the fixed support portion and establishes a positioning guide for the upper end shaft system;

[0241] A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system;

[0242] By cooperating the first positioning bearing (13) with the second positioning bearing and combining with the fixed support part, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established;

[0243] The second locating bearing comprises:

[0244] An end bearing (16) provided at the end of the butt shaft (8)

[0245] and

[0246] A support bearing (17) is sleeved on the docking shaft (8) and fixedly mounted on the fixed support portion.

[0247] in,

[0248] The mounting hole for mounting the piston (9) and the mounting hole for mounting the support bearing (17) are coaxial;

[0249] (Through coaxial installation, the piston drives the friction disc to fit the axial surface of the drive shaft to form an auxiliary positioning guide).

[0250] in,

[0251] A friction plate (18) is provided on the friction disc (10).

[0252] in,

[0253] The friction disc (10) and the docking shaft (8) are in rectangular spline fit.

[0254] A gear shift test method for a gearbox automatic test bench, the test method is completed by driving a gear shift fork (2) to rotate to different gear positions and docking with a gear shift rocker arm (6) of a test piece at different gear positions, the gear shift fork (2) being driven to rotate by a drive shaft system and driven to shift by a gear shift drive system, such as Figure 1 As shown, the following steps are included:

[0255] S1: The tested object is fixed, and the drive shaft system and the gear shift drive system are respectively operated to drive the gear shift fork (2) to rotate to the theoretical zero position;

[0256] S2: disconnecting the gear shift drive system from the gear shift fork (2);

[0257] S3: the shift fork (2) is connected to the shift rocker arm (6) of the tested part;

[0258] S4: The torque sensor (1) is used in conjunction with the encoder to measure and determine the real-time shift force and the actual angle of each gear.

[0259] in,

[0260] The shift fork (2) is directly driven by a drive shaft system, and a servo motor and a drive shaft are provided on the drive shaft system.

[0261] The encoder is arranged in the servo motor.

[0262] The torque sensor (1) is arranged on the drive shaft.

[0263] The specific step S4 is as follows:

[0264] The torque sensor captures the shift force at the moment when each gear is engaged;

[0265] The encoder cooperates with the shift force curve to read and determine the actual angle of each gear.

[0266] in,

[0267] The gear shift drive system is driven by a cylinder (4);

[0268] A docking fork (5) connected to and driven by the cylinder and cooperating with the shift fork (2);

[0269] The step S2 is specifically implemented by the following operations: the cylinder drives the docking fork (5) to move, thereby disengaging the docking fork (5) from the shift fork (2).

[0270] in,

[0271] A guide piece is provided at the end of the shift fork (2);

[0272] A guide notch is provided at the end of the guide member;

[0273] The shift fork (2) cooperates with the shift rocker arm (6) of the tested part through the guide notch of the provided guide part.

[0274] in,

[0275] The drive shaft system is provided with a drive shaft.

[0276] The shift fork (2) and the drive shaft are key-matched; and the shift fork (2) is provided with a return spring;

[0277] The return spring cooperates with the shift drive system; specifically, the shift fork (2) in step S3 moves downward to the docking position under the action of the return spring and docks with the shift rocker arm (6) of the tested component.

[0278] in,

[0279] The drive shaft system is connected to the shift fork through a clutch, the clutch comprises an upper shaft system and a lower shaft system, a lower encoder (3) is arranged on the lower shaft system, and the shift fork (2) is arranged on the lower shaft system;

[0280] The specific step S1 is as follows:

[0281] The tested object is fixed, the clutch is engaged, the drive shaft system and the shift drive system are respectively activated, and the shift fork (1) is driven to rotate to the zero position of the lower end encoder (i.e. the theoretical initial angle);

[0282] The specific step S4 is as follows:

[0283] S41: The clutch is disengaged, and the shift fork returns to the initial angle under the action of the resilience of the shift rocker arm (6) of the tested part; the lower end encoder (3) reads the angle at this moment and records it as the actual initial angle;

[0284] S42: The clutch is engaged, the drive shaft system and the gear shift drive system are respectively actuated to drive the gear shift fork (2) to rotate to the theoretical angle of the next gear position;

[0285] S43: disconnecting the gear shift drive system from the gear shift fork (2);

[0286] S44: the shift fork (2) is connected to the shift rocker arm (6) of the tested part;

[0287] S45: the clutch is disengaged, and the shift fork returns to the actual second gear position angle under the action of the resilience of the shift rocker arm (2) of the tested part; the lower end encoder (3) reads the angle at this moment and records it as the actual second gear position angle;

[0288] S46: The real-time shift force during the rotation from the initial gear position to the second gear position is read through the torque sensor (1) in combination with the lower end encoder (3).

[0289] in,

[0290] A clutch part is provided on the lower end shaft system and can move relative to the upper end shaft system;

[0291] A clutching relationship between the upper shaft system and the lower shaft system is established by a clutch part that can form relative motion with respect to the upper shaft system;

[0292] An upper shaft (7) is provided on the upper shaft system;

[0293] A docking shaft (8) is provided at the lower end of the shaft system;

[0294] The upper end shaft (7) and the docking shaft (8) are coaxially arranged;

[0295] The clutch unit includes:

[0296] a pneumatically propelled piston (9),

[0297] The friction disc (10) moves with the piston drive,

[0298] A return spring (11) is arranged at the shaft end of the docking shaft and can reset the friction disc (10) and the piston (9);

[0299] The piston (9) is axially movable on the fixed support portion;

[0300] The friction disc (10) is movably arranged on the docking shaft (8) in the axial direction;

[0301] The pneumatic propulsion piston (9) moves, driving the friction plate (10) to dock with the upper shaft (7), thereby establishing the clutch engagement;

[0302] The clutch is disengaged by the return movement of the return spring (11) without pneumatic propulsion.

[0303] in,

[0304] The upper shaft system and the lower shaft system are respectively fixedly supported by the provided fixed support parts;

[0305] A positioning guide structure is provided on the fixed support portion.

[0306] The clutch completes the fixed support of the upper shaft system and the lower shaft system and the positioning and guiding required for forming the coaxiality between the two through the fixed support part and the positioning and guiding structure arranged by the clutch.

[0307] in,

[0308] The piston (9) is connected to the friction disk (10) via a thrust bearing (12).

[0309] in,

[0310] The positioning guide structure includes:

[0311] A first positioning bearing (13) is arranged on the fixed support portion and establishes a positioning guide for the upper end shaft system;

[0312] A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system;

[0313] By cooperating the first positioning bearing (13) with the second positioning bearing and combining with the fixed support part, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established;

[0314] The second locating bearing comprises:

[0315] An end bearing (16) provided at the end of the butt shaft (8)

[0316] and

[0317] A support bearing (17) is sleeved on the docking shaft (8) and fixedly mounted on the fixed support portion.

[0318] in,

[0319] The fixed support portion comprises:

[0320] A first mounting seat (14) for fixedly supporting the upper end shaft system;

[0321] A second mounting seat (15) for supporting the lower shaft system,

[0322] and

[0323] A connecting rod is used to connect the first mounting seat (14) and the second mounting seat (15).

[0324] in,

[0325] The mounting hole for mounting the piston (9) and the mounting hole for mounting the support bearing (17) are coaxial;

[0326] Through coaxial installation, the piston drives the friction disc to fit the axial surface of the drive shaft to form an auxiliary positioning guide.

[0327] in,

[0328] in,

[0329] The friction disc (10) and the docking shaft (8) are in rectangular spline fit.

[0330] Example

[0331] according to Figure 3 As shown, the assembly of the test mechanism is completed; wherein, the drive shaft system is driven by a servo motor, and an encoder is provided on the servo motor. The drive shaft system, the shift drive system, and the clutch are uniformly fixed to the mounting base plate in the figure; the clutch includes two upper and lower rotating shafts, and the two rotating shafts can be combined and disengaged; the upper shaft of the clutch is connected to the drive shaft system through a coupling; the docking shaft is connected to the shift fork, and the shift fork can slide up and down relative to the docking shaft and transmit torque through a small-gap rectangular spline or a flat key. A lower encoder is installed on the docking shaft, which can accurately read the angle of shaft rotation. When this shift mechanism works, the tested piece is first fixed, the clutch is combined, and the entire shaft system is driven to rotate by the servo motor to rotate the angle of the shift fork to the zero position of the lower encoder. The cylinder extends, driving the docking fork to move downward and disengage from the shift fork. The shift fork moves downward to the docking position under the action of the spring, and the guide notch on the guide member at the end of the shift fork is combined with the positioning surface on the shift rocker arm of the tested part. At this time, the position of the shift rocker arm of the tested part has a small rotation angle with its initial angle. The clutch is disengaged, and the lower end shaft system of the clutch will return to the initial angle under the action of the rebound force of the shift rocker arm of the tested part. The lower end encoder is read to record this initial angle. The clutch is engaged, and the servo motor drives the entire shaft system to rotate to the theoretical angle of the next gear. The clutch is disengaged, and the lower end shaft system of the clutch returns to the natural position of the second gear under the action of the rebound force of the shift rocker arm of the tested part. The angle recorded by the lower end encoder is the actual angle of the second gear. The real-time shift force during the conversion process from the first gear to the second gear is read by the torque sensor combined with the lower end encoder. Repeat the above actions and shift to all the shift gears that need to be tested according to the test requirements to complete the test.

[0332] The above scheme is the preferred scheme, and you can also follow Figure 4As shown in the figure, a suboptimal solution is established, in which the setting of the clutch and the lower end encoder is omitted, and the rest of the settings are essentially the same as the above solution; the corresponding working process is: the shift fork is connected to the shift rocker arm of the tested part, and the cylinder drives the up and down movement to achieve docking with the shift ball head of the tested part. The shift shaft and the shift rocker arm of the tested part are slidingly matched and can transmit torque. The servo motor drives the shift shaft to rotate, and the shift rocker arm of the tested part is rotated to each gear according to the gear characteristics of the tested part, and then the test items of each gear of the gearbox are started. The shift force when each gear is engaged can be captured by the torque sensor. The actual angle of each gear can be roughly read by the encoder on the servo motor in combination with the shift force curve.

[0333] The clutch in the above (specific structure see Figure 5 ) The clutch is engaged by applying pressure through the air inlet, and reset by the reset spring 11 after the pressure is released. The first mounting seat, the second mounting seat and the connecting rod form a fixed whole for supporting the entire clutch structure; they can be integrally formed or detachably formed, and it is only necessary to ensure that the two holes of the support bearing on the thrust bearing seat are coaxial with the holes for piston installation and can be installed on a fixed mounting seat. The upper end shaft system is rotatable through the driving bearing support provided on the first mounting seat, and is connected to the driving shaft system through the upper end shaft. The docking shaft is positioned and rotatable by the support bearing and the end bearing support. The docking shaft and the friction disk are connected by a rectangular spline, so that the friction disk can slide up and down on the docking shaft and rotate with the docking shaft; the rectangular spline connection here can be replaced by other forms of splines, square shafts, docking plates containing locating pins or other circumferentially positioned axial sliding structures. The piston can slide relative to the piston mounting hole, and a seal is installed on the piston. When compressed air is passed through the air inlet, the piston is driven to move upward, driving the friction disc upward. The friction plate on the friction disc is pressed against the drive shaft, realizing the combination of the two rotating shafts of the clutch. The friction plate is set to facilitate the replacement of wear parts. The friction surface can also be directly set on the upper surface of the friction disc to replace the friction plate. After the compressed air at the air inlet is relieved, the friction disc moves downward under the action of the return spring and separates from the upper end shaft, realizing the disengagement of the two rotating shafts of the clutch.

[0334] The present invention provides a gear shift test mechanism and test method for a gearbox automatic test bench. The measurement of the gear shift force and the gear shift angle is established by means of a torque sensor and an encoder. The setting ensures that the gear shift rocker arm of the tested part can return to the correct position of each gear position during the test. To improve the measurement accuracy, a setting is established for the gear shift fork and the gear shift drive system that drives the gear shift fork to shift gears, which is engaged during gear shifting operation and disengaged during non-gear shifting operation. Furthermore, a clutch that can be directly disengaged and engaged is established between the drive shaft system and the gear shift fork. Through a series of settings and coordination, a gear shift test mechanism is finally established that can solve the problem of deviation between the actual gear shift angle and the theoretical gear shift angle in the prior art, and can realize simultaneous and accurate testing of the gear shift force and the gear shift angle, and can realize that the gear shift rocker arm of the tested part can return to the correct position of each gear position when the gearbox is loaded and tested. The measurement accuracy is guaranteed from all angles.

Claims

1. A gear shift test mechanism for a gearbox automatic test bench, characterized in that Included are: A drive shaft system for driving gear shifting; A torque sensor (1) and a lower end encoder are provided on the drive shaft system. The drive shaft is connected to the shift fork (2) via a clutch; The clutch includes an upper shaft connected to the drive shaft and a lower shaft connected to the shift fork. The upper shaft system and the lower shaft system are respectively fixedly supported by the provided fixed support parts; A positioning guide structure is provided on the fixed support portion. The clutch completes the fixed support of the upper shaft system and the lower shaft system and the positioning and guiding structure required for the coaxial formation between the two through the fixed support part and the positioning and guiding structure provided by the clutch; A clutch part is provided on the lower end shaft system and can move relative to the upper end shaft system; A clutching relationship between the upper shaft system and the lower shaft system is established by a clutch part that can form relative motion with respect to the upper shaft system; The gear shift testing mechanism also includes: a gear shift drive system, The shift fork (2) is arranged on the drive shaft system. The gear shift drive system and the gear shift fork (2) form a structural setting relationship in which they are engaged during gear shifting operations and disengaged during non-gear shifting operations; The clutch part is driven by the drive shaft system to move axially in a manner that it can rotate relative to the drive shaft system; The drive shaft system is provided with a drive shaft. The shift fork (2) and the drive shaft are key-matched; and the shift fork (2) is provided with a return spring; The return spring works in cooperation with the gear shift drive system; An upper end shaft (7) is provided on the upper end shaft system; A docking shaft (8) is provided at the lower end of the shaft system; The upper end shaft (7) and the docking shaft (8) are arranged coaxially; The clutch unit includes: A pneumatically propelled piston (9), The friction plate (10) moves with the piston drive, A return spring (11) is provided at the shaft end of the docking shaft and can reset the friction disc (10) and the piston (9); The piston (9) is axially movable on the fixed support portion; The friction disc (10) is axially movably arranged on the docking shaft (8).

2. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: A lower end encoder (4) is provided on the lower end shaft system.

3. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: The gear shift drive system is driven by a cylinder (3); A docking shift fork (5) connected to and driven by the cylinder and cooperating with the shift fork (2) is provided.

4. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: A guide piece is provided at the end of the shift fork (2); A guide notch is provided at the end of the guide member; The shift fork (2) cooperates with the shift rocker arm (6) of the tested part through a guide notch of a provided guide part.

5. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: The drive shaft system and the gear shift drive system are both provided with fixed supports; The fixed support and the fixed support part of the clutch are arranged integrally or separately.

6. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: The piston (9) is connected to the friction disk (10) via a thrust bearing (12).

7. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: The positioning guide structure includes: A first positioning bearing (13) provided on the fixed support portion and providing a positioning guide for the upper shaft system; A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system; By matching the first positioning bearing (13) with the second positioning bearing and combining with the fixed support portion, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established.

8. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: The fixed support portion comprises: A first mounting seat (14) for fixing and supporting the upper end shaft system; A second mounting seat (15) for supporting the lower shaft system, and A connecting rod used to connect the first mounting seat (14) and the second mounting seat (15).

9. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: The positioning guide structure includes: A first positioning bearing (13) provided on the fixed support portion and providing a positioning guide for the upper shaft system; A second locating bearing provided at the lower end shaft system to establish a positioning guide for the lower end shaft system; By cooperating the first locating bearing (13) with the second locating bearing and combining with the fixed support part, a positioning and guiding mechanism of the pneumatic clutch itself required for coaxiality is established; The second locating bearing comprises: an end bearing (16) provided at the end of the butt shaft (8), and A support bearing (17) is sleeved on the docking shaft (8) and fixedly mounted on the fixed support portion.

10. The gear shift test mechanism for a gearbox automatic test bench according to claim 9, characterized in that: The mounting hole for mounting the piston (9) and the mounting hole for mounting the support bearing (17) are coaxial.

11. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: A friction plate (18) is provided on the friction disc (10).

12. The gear shift test mechanism for a gearbox automatic test bench according to claim 1, characterized in that: The friction disc (10) and the docking shaft (8) are in rectangular spline fit.

13. A gear shift test method for a gearbox automatic test bench according to any one of claims 1 to 12, wherein the test method is completed by driving a gear shift fork (2) to rotate to different gears and docking with a gear shift rocker arm (6) of a test piece at different gears, wherein the gear shift fork (2) is driven to rotate by a drive shaft system and driven to shift by a gear shift drive system, and wherein the gear shift fork (2) is driven to rotate by a drive shaft system and driven to shift by a gear shift drive system, and wherein the gear shift test method is completed by driving a gear shift fork (2) to rotate to different gears and docking with a gear shift rocker arm (6) of a test piece at different gears. The steps include: S1: The shift rocker arm of the tested part is fixed, and the drive shaft system and the shift drive system are respectively actuated to drive the shift fork (2) to rotate to the theoretical zero position; S2: disconnecting the gear shift drive system from the gear shift fork (2); S3: the shift fork (2) is connected to the shift rocker arm (6) of the tested part; S4: The torque sensor (1) is used in conjunction with the lower encoder to measure and determine the real-time shift force and the actual angle of each gear.

14. The gear shifting test method for a gearbox automatic test bench according to claim 13, characterized in that: The shift fork (2) is directly driven by a drive shaft system, and a servo motor and a drive shaft are provided on the drive shaft system. The lower end encoder is arranged in the servo motor. The torque sensor (1) is arranged on the drive shaft. The specific step S4 is as follows: The torque sensor captures the shift force at the moment when each gear is engaged; The lower end encoder cooperates with the shift force curve to read and determine the actual angle of each gear.

15. The gear shifting test method for a gearbox automatic test bench according to claim 13, characterized in that: Step S2 is specifically implemented by the following operations: the cylinder drives the docking fork (5) to move, thereby achieving the disengagement of the docking fork (5) from the shift fork (2).

16. The gear shifting test method for a gearbox automatic test bench according to claim 13, characterized in that: In step S3, the shift fork (2) moves downward to a docking position under the action of a return spring, and docks with the shift rocker arm (6) of the tested component.

17. The gear shifting test method for a gearbox automatic test bench according to claim 13, characterized in that: The drive shaft system is connected to the shift fork via a clutch, the clutch comprises an upper shaft system and a lower shaft system, a lower encoder (4) is arranged on the lower shaft system, and the shift fork (2) is arranged on the lower shaft system; Step S1 is specifically as follows: The shift rocker arm (6) of the tested part is fixed, the clutch is engaged, the drive shaft system and the shift drive system are respectively actuated, and the shift fork (2) is driven to rotate to the zero position of the lower end encoder; Step S4 is specifically as follows: S41: The clutch is disengaged, and the shift fork returns to the initial angle under the action of the resilience of the shift rocker arm (6) of the tested part; the lower end encoder (4) reads the angle at this moment and records it as the actual initial angle; S42: The clutch is engaged, the drive shaft system and the gear shift drive system are respectively actuated, and the gear shift fork (2) is driven to rotate to the theoretical angle of the next gear position; S43: disconnecting the gear shift drive system from the gear shift fork (2); S44: the shift fork (2) is connected to the shift rocker arm (6) of the tested part; S45: the clutch is disengaged, and the shift fork returns to the actual second gear position angle under the action of the resilience of the shift rocker arm (6) of the tested part; the lower end encoder (4) reads the angle at this moment and records it as the actual second gear position angle; S46: The real-time shift force during the rotation from the initial gear position to the second gear position is read through the torque sensor (1) in combination with the lower end encoder (4).

18. The gear shifting test method for a gearbox automatic test bench according to claim 17, characterized in that: A clutch part is provided on the lower end shaft system and can move relative to the upper end shaft system; A clutching relationship between the upper shaft system and the lower shaft system is established by a clutch part that can form relative motion with respect to the upper shaft system; The pneumatic propulsion piston (9) moves, driving the friction plate (10) to dock with the upper shaft (7), thereby establishing the clutch engagement; The clutch is disengaged by the return movement of the return spring (11) without pneumatic propulsion.

19. A gear shift test method for a gearbox automatic test bench according to claim 18, characterized in that: Through coaxial installation, the piston drives the friction disc to fit the axial surface of the drive shaft to form an auxiliary positioning guide.

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