Precision positioning fixture and loading and unloading method based on automatic transmission oil pump test bench

Abstract

The precise positioning fixture and loading and unloading method based on the automatic transmission oil pump test bench belong to the field of automatic transmission oil pump testing technology. The automatic transmission oil pump is installed on the mounting plate, the oil filter is installed on the mounting plate and placed in the oil pool, the mounting plate is connected to the bracket, and the bracket is fixed on the fixture support seat; the oil pump drive shaft is fixedly connected to the output shaft of the drive motor, the oil pump drive shaft is connected to the rotor of the automatic transmission oil pump, the oil pump drive shaft is connected to the needle bearing of the automatic transmission oil pump, and the output shaft of the drive motor and the axis of the oil pump drive shaft are in the same straight line. The disassembly method is: loosen the fastening bolts, screw the long bolts into the threaded through holes of the oil pump drive shaft flange and against the end face of the bracket flange, tighten the long bolts, and push the oil pump drive shaft out through the reaction force. The precise positioning fixture of the present invention can make it easier to ensure the dimensional tolerance, improve the positioning accuracy of the fixture, and reduce the processing difficulty of the fixture.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic transmission oil pump testing, and in particular relates to a precise positioning fixture and a loading and unloading method based on an automatic transmission oil pump test bench. Background Art

[0002] The automatic transmission oil pump is the power source of the automatic transmission hydraulic system. The oil pumped out passes through the shift valve system and achieves shifting by giving oil pressure. The other way is used as lubrication to provide friction plates of various clutches and brakes. The performance test results of the automatic transmission oil pump provide key data support for the development and verification of the automatic transmission hydraulic system.

[0003] In the past, the fixtures used in the automatic transmission oil pump performance test conducted on the automatic transmission oil pump test bench all used the method of "the axis of the bracket and the oil pump drive shaft are in the same straight line, the axis of the mounting plate and the bracket are in the same straight line, and the axis of the automatic transmission oil pump and the mounting plate are in the same straight line" to ensure the positional relationship between the oil pump drive shaft and the automatic transmission oil pump. However, in actual testing, due to the transmission and accumulation of tolerances in the dimension chain, when the test requirements have high positional accuracy requirements such as coaxiality, this part matching method is difficult to meet the requirements, and it also brings difficulties to the processing and manufacturing of the fixture. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a precise positioning fixture and a loading and unloading method based on an automatic transmission oil pump test bench, which improves the positioning accuracy of the fixture as a whole and reduces the difficulty of its manufacturing and processing.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] The precise positioning fixture based on the automatic transmission oil pump test bench includes a mounting plate and a bracket; a central through hole is provided in the middle of the mounting plate, the automatic transmission oil pump is installed on one end face of the mounting plate, and the input end of the automatic transmission oil pump is arranged in the central through hole of the mounting plate, the oil filter is installed in the lower part of the mounting plate and immersed in the oil pool, the end face on the other side of the mounting plate is connected to the end face on one side of the bracket, and the end face on the other side of the bracket is fixed on the fixture support seat; the input end of the oil pump drive shaft is fixedly connected to the output shaft of the drive motor, the output end of the oil pump drive shaft passes through the fixture support seat and the bracket and is installed in the rotor of the automatic transmission oil pump, and the oil pump The drive shaft is fitted in a needle bearing inside the automatic transmission oil pump for positioning, the output shaft of the drive motor is in the same straight line with the axis of the oil pump drive shaft, an oil suction port and an oil outlet are provided on the mounting plate, one end of the oil suction port is connected with the oil filter, and the other end of the oil suction port is connected with the oil inlet circuit of the automatic transmission oil pump; one end of the oil outlet port is connected with the oil outlet circuit of the automatic transmission oil pump, and the other end of the oil outlet port is connected with one end of the oil outlet pipeline of the automatic transmission oil pump test bench, the drive motor and the fixture support seat are fixed on the base platform; an oil pump drive shaft is provided with an oil pump drive shaft flange, and a threaded through hole is provided on the oil pump drive shaft flange.

[0007] Furthermore, two positioning holes are provided on one end surface of the mounting plate, and two positioning bushings are provided on the connecting end surface of the automatic transmission oil pump. The two positioning bushings of the automatic transmission oil pump are fitted in the two positioning holes of the mounting plate.

[0008] Furthermore, a mounting hole is provided on one end surface of the mounting plate, a stainless steel sleeve is fixed in the mounting hole, and a central hole of the stainless steel sleeve is a threaded hole.

[0009] Furthermore, a section of the outer surface of the oil pump drive shaft is a conical surface, the outer end surface of the output shaft of the drive motor is provided with an axial hole along the axial direction, a section of the axial hole is a conical hole, and the conical surface of the oil pump drive shaft is tightly matched with the conical hole of the output shaft of the drive motor; the coaxiality of the conical surface and the conical hole does not exceed φ0.05mm.

[0010] Furthermore, a positioning section is provided on the oil pump drive shaft, and an external spline is provided on the outer surface of the output end of the positioning section of the oil pump drive shaft, and an internal spline is provided on the inner surface of the rotor of the automatic transmission oil pump. The external spline at the output end of the positioning section of the oil pump drive shaft is matched and connected with the internal spline of the rotor of the automatic transmission oil pump; the coaxiality of the major diameter of the external spline and the conical surface of the oil pump drive shaft is not higher than φ0.05mm.

[0011] Furthermore, a bracket flange is provided at the other end of the bracket, a circular hole is provided at the center of the bracket flange, the oil pump drive shaft passes through the circular hole of the bracket flange, and the bracket is fixedly connected to the fixture support seat by fastening bolts.

[0012] Furthermore, the oil pump drive shaft flange is arranged between the positioning section and the conical surface of the oil pump drive shaft.

[0013] Furthermore, a cylindrical boss is provided on the other side end surface of the bracket, and the cylindrical boss is gap-matched with a groove on a side surface of the clamp support seat.

[0014] Furthermore, a lifting lug is fixed on the upper side of the mounting plate.

[0015] A method for assembling and disassembling a precise positioning fixture based on an automatic transmission oil pump test bench, the method comprising an installation method and a disassembly method, wherein the installation method is:

[0016] First, install them separately in two groups. One group is to fix the bracket and the fixture support together, and then connect the oil pump drive shaft and the output shaft of the drive motor through fastening bolts; the other group is to connect and fix the automatic transmission oil pump and the mounting plate together, and the oil filter and the mounting plate together; then, match and install the oil pump drive shaft in the automatic transmission oil pump, and fix the mounting plate and the bracket together;

[0017] The disassembly method is: loosen and remove the fastening bolts between the oil pump drive shaft and the output shaft of the drive motor, screw a long bolt into the threaded through hole of the oil pump drive shaft flange, and press it against the end face of the bracket flange, rotate the long bolt clockwise, and push the oil pump drive shaft out through the reaction force.

[0018] The beneficial effects of the present invention relative to the prior art are:

[0019] 1) The precise positioning fixture of the present invention changes the axis of the four parts to keep the axis of the two parts in line, and the bracket and the mounting plate only play the role of supporting and determining the axial distance. This method makes it easier to meet the test conditions, while eliminating the need for the production of positioning pins, relaxing the dimensional tolerance requirements of a single part, and reducing the difficulty of fixture processing.

[0020] 2) The installation method of the precise positioning fixture of the present invention ensures that the assembly process of the entire fixture can be carried out in two groups simultaneously, providing an efficient and time-saving installation solution.

[0021] 3) The present invention utilizes reaction force to disassemble the oil pump drive shaft, which effectively solves the problem that the oil pump drive shaft is difficult to disassemble due to the tight connection with the motor output shaft.

[0022] 4) The present invention adopts a mounting plate with lifting ears, so that the user can freely move the mounting plate by using the hook and pulley mechanism of the automatic transmission oil pump test bench, which saves effort and time.

[0023] 5) The present invention adopts a mounting plate with threaded holes made of steel, so that the threads can remain unchanged during repeated disassembly and assembly of the automatic transmission oil pump, thereby extending the service life of the mounting plate.

[0024] In summary, the precise positioning fixture of the present invention can make it easier to ensure the dimensional tolerance, improve the positioning accuracy of the fixture (specifically, the output shaft of the drive motor and the axis of the oil pump drive shaft are in the same straight line), and reduce the difficulty of machining the fixture. Based on this precise positioning fixture structure, the test bench can simulate the working conditions of the automatic transmission oil pump at different speeds and different oil pressures, eliminating the interference factors caused by other components in the whole machine test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a precise positioning fixture based on an automatic transmission oil pump test bench of the present invention;

[0026] Figure 2 A schematic diagram of the relative position relationship between the precise positioning fixture of the present invention and the flow meter and pressure control module of the automatic transmission oil pump test bench;

[0027] Figure 3 yes Figure 1 A partial enlarged view of point A.

[0028] The names and numbers of the components involved in the above drawings are as follows:

[0029] Automatic transmission oil pump 1, oil filter 2, mounting plate 3, bracket 4, output shaft 5, oil pump drive shaft 6, drive motor 7, fixture support seat 8, base platform 9, oil outlet pipeline 10, flow meter 11, pressure control module 12, torque sensor 13, oil pool 14, positioning bushing 15, oil pump drive shaft flange 16, positioning section 17, bracket flange 18, cone 19, needle bearing 20, fixing bolt 21. DETAILED DESCRIPTION

[0030] Specific implementation method 1: Figure 1-Figure 3As shown, this embodiment records a precise positioning fixture based on an automatic transmission oil pump test bench, including a mounting plate 3 and a bracket 4; a central through hole is provided in the middle of the mounting plate 3, the automatic transmission oil pump 1 is mounted on an end face of one side of the mounting plate 3, and the input end of the automatic transmission oil pump 1 is arranged in the central through hole of the mounting plate 3, the oil filter 2 is mounted on the lower part of the mounting plate 3 and immersed in the oil pool 14 (the oil filter is a finished oil filter including a shell and a filter element structure), the end face of the other side of the mounting plate 3 is connected to the end face of one side of the bracket 4, and the end face of the other side of the bracket 4 is fixed on the fixture support seat 8; the input end of the oil pump drive shaft 6 is fixedly connected to the output shaft 5 of the drive motor 7, and the output end of the oil pump drive shaft 6 passes through the fixture support seat 8 and the bracket 4 and is installed in the rotor of the automatic transmission oil pump 1 (for driving the rotor to rotate The oil pump drive shaft 6 is mounted in the needle bearing 20 inside the automatic transmission oil pump 1 (the oil pump drive shaft 6 and the needle bearing 20 of the automatic transmission oil pump 1 are clearance-matched) for positioning. The output shaft 5 of the drive motor 7 and the axis of the oil pump drive shaft 6 are in the same straight line. An oil suction port and an oil outlet (both of which are through ports) are provided on the mounting plate 3. One end of the oil suction port is connected with the oil filter 2, and the other end of the oil suction port is connected with the oil inlet oil circuit of the automatic transmission oil pump 1; one end of the oil outlet port is connected with the oil outlet oil circuit of the automatic transmission oil pump 1, and the other end of the oil outlet port is connected with one end of the oil outlet pipeline 10 of the automatic transmission oil pump test bench. The drive motor 7 and the fixture support seat 8 are both fixed on the base platform 9; an oil pump drive shaft flange 16 is provided on the oil pump drive shaft 6, and a threaded through hole is provided on the oil pump drive shaft flange 16.

[0031] The oil outlet pipeline 10 of the automatic transmission oil pump test bench is connected to a flow meter 11 and a pressure control module 12 .

[0032] The output shaft 5, the drive motor 7, the fixture support 8, the base platform 9, the oil outlet pipeline 10, the flow meter 11, the pressure control module 12, the torque sensor 13 and the oil pool 14 are all inherent components of the automatic transmission oil pump test bench. The user controls the parameters of the pressure control module 12 and the drive motor 7 through a computer, and reads the parameters of the flow meter 11 and the torque sensor 13.

[0033] Specific implementation method 2: Figure 1 , Figure 3As shown, this embodiment is a further explanation of the specific embodiment 1. Two positioning holes (the positioning holes are cylindrical) are provided on the end surface of one side of the mounting plate 3, and two positioning bushings 15 are provided on the connecting end surface of the automatic transmission oil pump 1. The two positioning bushings 15 of the automatic transmission oil pump 1 are matched and installed in the two positioning holes of the mounting plate 3. The horizontal and vertical coordinates of the positioning hole positions are determined according to the positions of the positioning bushings 15, that is, with the axis of the needle bearing 20 as the coordinate origin, the horizontal and vertical coordinates of the two positioning bushings 15 are the horizontal and vertical coordinates of the center of the positioning hole; the dimensional tolerance of the horizontal and vertical coordinates is ±0.02mm;

[0034] A threaded hole is provided on one end surface of the mounting plate 3 , and the automatic transmission oil pump 1 is threadedly connected to the threaded hole of the mounting plate 3 by means of a fastening bolt, thereby fixing the automatic transmission oil pump 1 on the mounting plate 3 .

[0035] Specific implementation method three: Figure 1 As shown, this embodiment is a further description of the specific embodiment 1. A mounting hole is provided on one end surface of the mounting plate 3, and a stainless steel sleeve is fixed in the mounting hole. The center hole of the stainless steel sleeve is a threaded hole.

[0036] Specific implementation method four: Figure 1 As shown, this embodiment is a further explanation of the specific embodiment 1, a section of the outer surface of the oil pump drive shaft 6 is a conical surface 19, the outer end surface of the output shaft 5 of the drive motor 7 is provided with an axial hole along the axial direction, a section of the axial hole is a conical hole, the conical surface 19 of the oil pump drive shaft 6 is tightly matched with the conical hole of the output shaft 5 of the drive motor 7; the coaxiality of the conical surface 19 and the conical hole does not exceed φ0.05mm.

[0037] Specific implementation method five: Figure 1 , Figure 3 As shown, this embodiment is a further explanation of the specific embodiment four, a positioning section 17 is provided on the oil pump drive shaft 6, the outer surface of the output end of the positioning section 17 of the oil pump drive shaft 6 is provided with an external spline, the inner surface of the rotor of the automatic transmission oil pump 1 is provided with an internal spline, the output end external spline of the positioning section 17 of the oil pump drive shaft 6 is matched and connected with the internal spline of the rotor of the automatic transmission oil pump 1; the coaxiality between the major diameter of the external spline and the conical surface 19 of the oil pump drive shaft 6 is not higher than φ0.05mm.

[0038] Specific implementation method six: Figure 1 As shown, this embodiment is a further explanation of the specific embodiment one, a bracket flange 18 is provided at the other end of the bracket 4, a circular hole is provided at the center of the bracket flange 18, the oil pump drive shaft 6 passes through the circular hole of the bracket flange 18, and the bracket 4 is fixedly connected with the fixture support seat 8 (the fixture support seat 8 is a component on the automatic transmission oil pump test bench) by fastening bolts.

[0039] Specific implementation method seven: Figure 1 , Figure 3 As shown, this embodiment is a further description of the specific embodiment five, and the oil pump drive shaft flange 16 is arranged between the positioning section 17 and the conical surface 19 of the oil pump drive shaft 6.

[0040] Specific implementation method eight: Figure 1 As shown, this embodiment is a further explanation of the specific embodiment 1. A cylindrical boss is provided on the other end face of the bracket 4, and the cylindrical boss is gap-matched with a groove on one side of the clamp support seat 8.

[0041] Specific implementation method nine: Figure 1 As shown, this embodiment is a further description of the specific embodiment 1, and a lifting lug is fixed on the upper side of the mounting plate 3 (so that the user can move the mounting plate 3 through the hook of the automatic transmission oil pump test bench).

[0042] Specific implementation method ten: Figure 1-Figure 3 As shown, this embodiment discloses a method for assembling and disassembling a precise positioning fixture based on an automatic transmission oil pump test bench as described in any one of the first to ninth embodiments, the assembly and disassembly method comprising an installation method and a disassembly method, wherein the installation method is:

[0043] First, they are divided into two groups and installed separately. One group is: fix the bracket 4 and the clamp support seat 8 together, and then connect the oil pump drive shaft 6 and the output shaft 5 of the drive motor 7 through fastening bolts; the other group is: connect and fix the automatic transmission oil pump 1 and the mounting plate 3 together, and connect and fix the oil filter 2 and the mounting plate 3 together; then, match and install the oil pump drive shaft 6 in the automatic transmission oil pump 1, and fix the mounting plate 3 and the bracket 4 together;

[0044] The disassembly method is: loosen and remove the fastening bolts between the oil pump drive shaft 6 and the output shaft 5 of the drive motor 7, screw a long bolt into the threaded through hole of the oil pump drive shaft flange 16, and press it against the end face of the bracket flange 18, rotate the long bolt clockwise, and push the oil pump drive shaft 6 out through the reaction force.

[0045] Embodiment 1:

[0046] like Figure 1-Figure 3 As shown, before installation, make sure there are no other test items and fixtures on the automatic transmission oil pump test bench. The installation can be carried out in two groups at the same time:

[0047] In the first group, four or more fastening bolts are used to fix the bracket 4 on the fixture support seat 8, and the cylindrical boss on the bracket 4 matches the groove on the automatic transmission oil pump test bench. Then, a fixing bolt 21 is used to connect and fix the oil pump drive shaft 6 and the output shaft 5 of the drive motor 7 together.

[0048] In the second group, the positioning bushing 15 on the automatic transmission oil pump 1 is inserted into the positioning hole on the outer end surface of the mounting plate 3, and the automatic transmission oil pump 1 is connected and fixed to the mounting plate 3 using the fastening bolts. Subsequently, the oil filter 2 is connected and fixed to the mounting plate 3. The order of installation in this group can be changed.

[0049] After both groups are assembled, hook the lifting lugs and move the second group of parts so that the positioning section 17 of the oil pump drive shaft 6 is matched with the needle bearing 20 in the automatic transmission oil pump 1. Gently turn the oil pump drive shaft 6 and adjust the position so that the outer spline of the oil pump drive shaft 6 and the inner spline of the rotor of the automatic transmission oil pump 1 are matched. After completion, use the fastening bolts to fix the mounting plate 3 and the bracket 4 together, and install the oil outlet pipeline 10, torque sensor 13, flow meter 11 and pressure control module 12 of the automatic transmission oil pump test bench in the corresponding positions.

[0050] After the performance test of the automatic transmission oil pump 1 is completed, it can be disassembled in the reverse order of installation. When disassembling the oil pump drive shaft 6, first loosen the fastening bolts used to fix the oil pump drive shaft 6 and the output shaft 5, then screw a long bolt into the threaded through hole of the oil pump drive shaft flange 16 and press it against the end face of the bracket flange 18 of the bracket 4, tighten the long bolt, and push the oil pump drive shaft 6 out through the reaction force.

[0051] The above embodiments are merely illustrative of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, and as long as they do not exceed the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A precise positioning fixture based on an automatic transmission oil pump test bench, comprising a mounting plate (3) and a bracket (4); characterized in that: A central through hole is provided in the middle of the mounting plate (3); the automatic transmission oil pump (1) is mounted on one end surface of the mounting plate (3), and the input end of the automatic transmission oil pump (1) is arranged in the central through hole of the mounting plate (3); the engine oil filter (2) is mounted on the lower part of the mounting plate (3) and immersed in the oil pool (14); the other end surface of the mounting plate (3) is connected to the end surface of one side of the bracket (4), and the other end surface of the bracket (4) is fixed on the fixture support seat (8); the input end of the oil pump drive shaft (6) is fixedly connected to the output shaft (5) of the drive motor (7); the output end of the oil pump drive shaft (6) passes through the fixture support seat (8) and the bracket (4) and is installed in the rotor of the automatic transmission oil pump (1); and the oil pump drive shaft (6) is mounted on the automatic transmission The needle bearing (20) inside the automatic transmission oil pump (1) is used for positioning. The output shaft (5) of the drive motor (7) and the axis of the oil pump drive shaft (6) are in the same straight line. The mounting plate (3) is provided with an oil suction port and an oil outlet. One end of the oil suction port is connected to the oil filter (2), and the other end of the oil suction port is connected to the oil inlet oil path of the automatic transmission oil pump (1); one end of the oil outlet port is connected to the oil outlet oil path of the automatic transmission oil pump (1), and the other end of the oil outlet port is connected to one end of the oil outlet pipeline (10) of the automatic transmission oil pump test bench. The drive motor (7) and the fixture support seat (8) are both fixed on the base platform (9); the oil pump drive shaft (6) is provided with an oil pump drive shaft flange (16), and the oil pump drive shaft flange (16) is provided with a threaded through hole.

2. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 1 is characterized in that: Two positioning holes are provided on one end surface of the mounting plate (3), two positioning bushings (15) are provided on the connecting end surface of the automatic transmission oil pump (1), and the two positioning bushings (15) of the automatic transmission oil pump (1) are fitted in the two positioning holes of the mounting plate (3).

3. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 1 is characterized in that: A mounting hole is provided on one end surface of the mounting plate (3), a stainless steel sleeve is fixed in the mounting hole, and the center hole of the stainless steel sleeve is a threaded hole.

4. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 1 is characterized in that: A section of the outer surface of the oil pump drive shaft (6) is a conical surface (19); an outer end surface of the output shaft (5) of the drive motor (7) is provided with an axial hole along the axial direction; a section of the axial hole is a conical hole; the conical surface (19) of the oil pump drive shaft (6) is tightly matched with the conical hole of the output shaft (5) of the drive motor (7); and the coaxiality of the conical surface (19) and the conical hole does not exceed φ0.05 mm.

5. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 4 is characterized in that: The oil pump drive shaft (6) is provided with a positioning section (17); the outer surface of the output end of the positioning section (17) of the oil pump drive shaft (6) is provided with an external spline; the inner surface of the rotor of the automatic transmission oil pump (1) is provided with an internal spline; the external spline of the output end of the positioning section (17) of the oil pump drive shaft (6) is matched and connected with the internal spline of the rotor of the automatic transmission oil pump (1); the coaxiality between the major diameter of the external spline and the conical surface (19) of the oil pump drive shaft (6) is not higher than φ0.05 mm.

6. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 1 is characterized in that: A bracket flange (18) is provided at the other end of the bracket (4), a circular hole is provided at the center of the bracket flange (18), the oil pump drive shaft (6) passes through the circular hole of the bracket flange (18), and the bracket (4) is fixedly connected to the clamp support seat (8) by fastening bolts.

7. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 5 is characterized in that: The oil pump drive shaft flange (16) is arranged between the positioning section (17) and the conical surface (19) of the oil pump drive shaft (6).

8. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 1 is characterized in that: A cylindrical boss is provided on the other end surface of the bracket (4), and the cylindrical boss is clearance-matched with a groove on one side surface of the clamp support seat (8).

9. The precise positioning fixture based on the automatic transmission oil pump test bench according to claim 1 is characterized in that: A lifting lug is fixed on the upper side of the mounting plate (3).

10. A method for assembling and disassembling a precise positioning fixture based on an automatic transmission oil pump test bench according to any one of claims 1 to 9, characterized in that: The loading and unloading method includes an installation method and a disassembly method, wherein the installation method is: First, the installation is divided into two groups and each group is installed separately. One group is: fixing the bracket (4) and the clamp support seat (8) together, and then connecting the oil pump drive shaft (6) and the output shaft (5) of the drive motor (7) through fastening bolts; the other group is: connecting and fixing the automatic transmission oil pump (1) and the mounting plate (3) together, and connecting and fixing the oil filter (2) and the mounting plate (3) together; then, the oil pump drive shaft (6) is matched and installed in the automatic transmission oil pump (1), and the mounting plate (3) and the bracket (4) are fixedly connected together; The disassembly method is as follows: loosen and remove the fastening bolts between the oil pump drive shaft (6) and the output shaft (5) of the drive motor (7), screw a long bolt into the threaded through hole of the oil pump drive shaft flange (16), and abut against the end surface of the bracket flange (18), and rotate the long bolt clockwise to push out the oil pump drive shaft (6) through the reaction force.

Images