Spline half shaft floating horizontal centering mechanism

Abstract

The application discloses a spline half shaft floating horizontal centering mechanism and belongs to the technical field of centering equipment of electric drive assembly. The spline half shaft floating horizontal centering mechanism comprises a rotating shaft sleeve, a moving plate and a floating plate which are connected with each other through a floating control assembly, a spline half shaft mounting sleeve which is fixedly connected with the floating plate, a floating shaft which is inserted into the rotating shaft sleeve at one end and connected with the spline half shaft mounting sleeve after sequentially penetrating through the moving plate and the floating plate at the other end, and a pressure sensor which is arranged between the rotating shaft sleeve and the floating shaft. The floating shaft can move along the axial direction of the floating shaft relative to the rotating shaft sleeve, and the floating shaft can rotate relative to the spline half shaft mounting sleeve. An equal-height bolt and a reverse-mounted thrust bearing are arranged to realize vertical point contact. Under the action of a certain force, the spline half shaft floating horizontal centering mechanism can achieve 360-degree floating, ensures that the spline half shaft and the electric drive assembly are kept concentric in a horizontal state, and avoids damage to the spline half shaft during disassembly and assembly.

Description

Technical Field

[0001] This invention belongs to the technical field of electric drive assembly centering equipment, specifically relating to a spline half-shaft floating horizontal centering mechanism. Background Technology

[0002] The electric drive assembly is a core component of a car, which includes components such as a motor, a gearbox, and a motor controller. After the motor generates driving force, the power is sent to the drive shaft, and then transmitted to the half-shafts on the left and right sides of the drive shaft. Due to the high speed and high torque characteristics of the electric drive system, its disassembly, assembly, and testing require precise positioning. Currently, the electric drive assembly is placed on a tray, and the process half-shaft of the electric drive assembly is inserted into the spline of the gearbox for quick and accurate positioning.

[0003] Chinese patent CN213658134U discloses a rapid alignment device for off-line testing of an electric drive system production line. The device includes a worktable and a precision positioning tray, roller conveyor, secondary positioning device, clamping device, dynamometer, dynamometer track, drive motor, limit device, process half-shaft, coupling, and torque sensor mounted on the worktable. The workpiece to be tested is placed on the precision positioning tray, which is positioned on the roller conveyor. A secondary positioning device is fixed at the final testing position. The secondary positioning device lifts the precision positioning tray and clamps it securely. The process half-shaft is connected to the dynamometer via a coupling. A torque sensor is mounted on the process half-shaft. The drive motor is connected to the dynamometer. The dynamometer slides along the dynamometer track. A limit device is located at the rear end of the precision positioning tray. The process half-shaft is splinedly connected to the workpiece to be tested. This device enables rapid alignment of the dynamometer half-shaft directly with the workpiece.

[0004] Because there is a deviation in the positional accuracy of the electric drive assembly on the tray, and the existing horizontal alignment does not have a floating mechanism, the spline half-shafts at both ends in the horizontal state cannot be concentric with the electric drive assembly product. During the rotation and tooth recognition process of the spline half-shafts in the mating bushing, the spline half-shafts will scratch the teeth, and there will also be a phenomenon where the spline half-shafts cannot be pulled out of the bushing and are damaged. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a floating horizontal centering mechanism for a splined half-shaft, comprising a rotating bushing, a movable plate and a floating plate connected to each other by a floating control component, a splined half-shaft mounting sleeve fixedly connected to the floating plate, a floating shaft with one end inserted into the rotating bushing and the other end passing through the movable plate and the floating plate in sequence and then connected to the splined half-shaft mounting sleeve, and a pressure sensor disposed between the rotating bushing and the floating shaft, wherein the floating shaft can move relative to the rotating bushing along its own axial direction and can rotate relative to the splined half-shaft mounting sleeve;

[0006] The floating plate is provided with a positioning sleeve with an opening facing the moving plate;

[0007] The floating control assembly includes a height-equalizing screw connecting the movable plate and the floating plate, a positioning pin disposed on the movable plate and capable of pneumatic extension and retraction to insert into the positioning sleeve, and an elastic locking element.

[0008] The elastic locking component includes an elastic element, equal-height bolts that pass sequentially through the elastic element, the movable plate, and the floating plate, a first thrust bearing installed in the opposite direction between the elastic element and the movable plate, and a second thrust bearing installed in the opposite direction between the movable plate and the floating plate.

[0009] Specifically, the seat rings of the first thrust bearing and the second thrust bearing are close to the moving plate, while the shaft rings of the first thrust bearing and the second thrust bearing are far from the moving plate.

[0010] Specifically, the shape of the positioning pin corresponds to the shape of the positioning sleeve, and the positioning pin is a cone with the tip of the cone facing the floating plate.

[0011] Specifically, the floating plate is rotatably connected to the floating shaft via a deep groove ball bearing.

[0012] Specifically, the floating shaft includes a universal joint, a main shaft connected to one end of the universal joint, and a sealing plate connected to the other end of the universal joint. The sealing plate has several guide holes, and the rotating bushing is provided with a guide pin that is inserted into the guide hole along the axial direction of the floating shaft.

[0013] Specifically, the spline half-shaft mounting sleeve is a sleeve that is open at both ends, with splines arranged around its inner wall and a spline half-shaft sensor that can be inserted into the sleeve on its outer wall.

[0014] Specifically, it also includes a base plate, on which a linear guide rail parallel to the axis of the floating shaft is provided, and the moving plate is slidably connected to the linear guide rail.

[0015] Specifically, the elastic element is a spring sleeved on the equal-height bolt.

[0016] Specifically, it also includes a side plate and a drive structure disposed on the side plate, the drive structure being connected to a rotating bushing for driving the rotating bushing to rotate.

[0017] Specifically, the drive structure includes a servo motor, a drive gear connected to the output end of the servo motor, and a transmission gear connected to the drive gear via a synchronous belt.

[0018] The technical solution provided by this invention has the following advantages compared with the prior art:

[0019] The use of equal-height bolts and reverse-mounted thrust bearings achieves vertical point contact between the floating plate and the moving plate, creating a floating gap. Under certain force, it can float 360 degrees, ensuring that the spline half-shaft and the electric drive assembly remain concentric in the horizontal state. This reduces the coefficient of friction between the spline half-shaft and the spline half-shaft mounting sleeve, making it easy to pull out the spline half-shaft during disassembly and easy to identify the teeth during assembly and disassembly, thus reducing damage to the spline half-shaft caused by disassembly and assembly. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of a spline half-shaft floating horizontal centering mechanism according to an embodiment of the present invention;

[0021] Figure 2 This is an exploded structural diagram of a spline half-shaft floating horizontal centering mechanism according to an embodiment of the present invention;

[0022] Figure 3 This is a structural diagram of the floating shaft in an embodiment of the present invention;

[0023] Figure 4 This is a connection diagram of the floating control component in an embodiment of the present invention;

[0024] Figure 5 This is an exploded view of the floating control component in an embodiment of the present invention;

[0025] Figure 6 This is the present invention. Figure 3 Sectional view along line AA.

[0026] The figure shows: 1. Mounting bracket; 11. Side plate; 12. Rib plate; 13. Base plate; 14. Linear guide rail; 2. Drive structure; 21. Servo motor; 22. Drive gear; 23. Synchronous belt; 24. Transmission gear; 3. Rotary bushing; 31. Guide pin; 4. Pressure sensor; 5. Floating shaft; 51. Sealing plate; 52. Guide hole; 53. Universal joint; 54. Main shaft; 55. End plate; 6. Moving plate; 7. Floating plate; 71. Positioning sleeve; 72. Deep groove ball bearing; 73. Bearing sleeve; 8. Splined half-shaft mounting sleeve; 81. Splined half-shaft sensor; 9. Floating control assembly; 91. Equalizing screw; 92. Cylinder; 93. Positioning pin; 94. Elastic locking element; 941. Sleeve; 942. Equalizing bolt; 943. First thrust bearing; 944. Second thrust bearing. Detailed Implementation

[0027] For ease of understanding, the following embodiments illustrate a floating horizontal centering mechanism for a splined half-shaft. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation and positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figures 1 to 2 As shown, a spline half-shaft floating horizontal centering mechanism includes a mounting frame 1, a drive structure 2, a rotating bushing 3, a pressure sensor 4, a floating shaft 5, a moving plate 6, a floating plate 7, a spline half-shaft mounting sleeve 8, and a floating control assembly 9. The mounting frame 1 includes a side plate 11 and a base plate 13. One end of the base plate 13 is connected to the side plate 11 through a stiffener 12. The base plate 13 and the side plate 11 are perpendicular to each other. A linear guide rail 14 parallel to the axis of the floating shaft 5 is provided on the base plate 13.

[0031] A drive structure 2 is installed on the side plate 11. The drive structure 2 includes a servo motor 21, a drive gear 22 connected to the output end of the servo motor 21, and a transmission gear 24 connected to the drive gear 22 via a synchronous belt 23. The servo motor 21 is connected to a reducer and fixed on the side plate 11. The servo motor 21 outputs rotational power to the drive gear 22, and the drive gear 22 then transmits the power to the transmission gear 24 via the synchronous belt 23, causing the transmission gear 24 to rotate. The drive structure 2 is connected to a rotating bushing 3 to drive the rotating bushing 3 to rotate.

[0032] The left end of the rotating bushing 3 is closed and fixedly connected to the drive structure 2, and the right end of the rotating bushing 3 is open and a floating shaft 5 is inserted therein. The floating shaft 5 can move relative to the rotating bushing 3 along its own axis.

[0033] See Figures 2 to 3As shown, the right end of the rotating shaft sleeve 3 is provided with three guide pins 31; the floating shaft 5 includes a universal joint 53, a main shaft 54 ​​connected to the right end of the universal joint 53, and a sealing plate 51 connected to the left end of the universal joint 53. One end of the main shaft 54 ​​connected to the spline half-shaft mounting sleeve 8 is provided with an end plate 55, which is inserted into the spline half-shaft mounting sleeve 8 and cannot be detached, and can rotate relative to the spline half-shaft mounting sleeve 8; the sealing plate 51 has three guide holes 52, and the guide pins 31 are inserted into the guide holes 52 one by one. A pressure sensor 4 is provided between the sleeve 3 and the floating shaft 5. Specifically, the pressure sensor 4 is fixed at the left end port of the sealing plate 51. After the guide pin 31 is fully inserted into the guide hole 52, the pressure sensor 4 can be triggered by squeezing, while protecting the pressure sensor 4 from excessive squeezing and avoiding damage. The rotating sleeve 3 has a built-in pressure spring (not shown in the figure). When the pressure sensor 4 is compressed, the pressure spring is compressed and applies force to the pressure sensor 4. At this time, the pressure sensor 4 can obtain a specific pressure value.

[0034] See Figure 1 The right end of the floating shaft 5 passes through the moving plate 6 and the floating plate 7 in sequence and is then inserted into the spline half-shaft mounting sleeve 8. The moving plate 6 is fixedly connected to the floating shaft 5.

[0035] Continue reading Figure 1 and Figure 2 The bottom of the movable plate 6 is slidably connected to the linear guide rail 14 via a slider. The linear guide rail 14 is used to limit the movement direction of the floating shaft 5 and the movable plate 6.

[0036] See Figures 5 to 6 The floating plate 7 has a positioning sleeve 71 with an opening facing the moving plate 6. A bearing sleeve 73 is fixedly connected to the side of the floating plate 7 away from the moving plate 6. A deep groove ball bearing 72 is installed in the bearing sleeve 73. The floating plate 7 is rotatably connected to the floating shaft 5 through the deep groove ball bearing 72. A spline half-shaft mounting sleeve 8 is fixedly connected to the bearing sleeve 73. The spline half-shaft mounting sleeve 8, the bearing sleeve 73, and the floating shaft 5 are all coaxial. The floating shaft 5 can rotate relative to the spline half-shaft mounting sleeve 8. The spline half-shaft mounting sleeve 8 is a spline sleeve with open ends. Its inner wall is covered with internal teeth. Its outer wall is equipped with a spline half-shaft sensor 81 that can be inserted into the sleeve body.

[0037] See Figures 3 to 4 A floating control component 9 is provided between the movable plate 6 and the floating plate 7. The floating control component 9 includes a height equalizing screw 91 connecting the movable plate 6 and the floating plate 7, a cylinder 92 provided on the movable plate 6, and an elastic locking member 94. The output end of the cylinder 92 is connected to a positioning pin 93. When the cylinder 92 extends, it can cause the positioning pin 93 to be inserted into the positioning sleeve 71. The shape of the positioning pin 93 corresponds to the shape of the positioning sleeve 71. The positioning pin 93 is a cone, and the tip of the cone faces the floating plate 7.

[0038] See Figures 5 to 6 The elastic locking element 94 includes a spring (not shown in the figure), a sleeve 941 fitted over the spring, an equal-height bolt 942 passing through the spring and the moving plate 6 from left to right and connecting to the floating plate 7, a first thrust bearing 943 installed in reverse between the sleeve 941 and the moving plate 6, and a second thrust bearing 944 installed in reverse between the moving plate 6 and the floating plate 7. One end of the spring is connected to the first thrust bearing 943, and the other end is connected to the sleeve 941. The thrust bearing consists of two thrust washers and a rolling element. The rolling element is made of an iron or copper retainer frame fitted with several balls. The two thrust washers are a shaft ring and a seat ring. The rolling element is located between the shaft ring and the seat ring. Reverse installation means that after the first thrust bearing 943 and the second thrust bearing 944 are installed, the seat rings of both are close to the moving plate 6, and the shaft rings of both are far away from the moving plate 6.

[0039] The electric drive assembly is placed on the tray. A spline half-shaft floating horizontal alignment mechanism is set on each side of the electric drive assembly. The spline half-shaft mounting sleeve 8 is inserted into the spline half-shaft. The two spline half-shaft floating horizontal alignment mechanisms work together to horizontally align the electric drive assembly.

[0040] Spline half-shaft assembly / disassembly: Cylinder 92 extends from the floating structure, positioning pin 93 inserts into positioning sleeve 71, spline half-shaft mounting sleeve 8 abuts against the spline half-shaft, and pressure sensor 4 transmits the pressure value. Based on the value, it is determined whether the teeth of the spline half-shaft mounting sleeve 8 and the spline half-shaft are engaged. If the teeth are engaged, the spline half-shaft is inserted into the spline half-shaft mounting sleeve 8, with a lower pressure value. If the teeth are not engaged, the floating shaft 5 is squeezed to the left by the spline half-shaft, with a higher pressure value. At this time, cylinder 92 is triggered to work, cylinder 92 retracts, positioning pin 93 and positioning sleeve 71 separate, floating plate 7 and moving plate 6 separate relative to each other, and equalizing screw 91... There is a floating clearance between the equal height screw 91 and the thrust bearing. The servo motor 21 drives the floating shaft 5 to rotate, which in turn drives the rotating bushing 3 to rotate. After successful tooth recognition, the pressure spring pushes the floating shaft 5 to move to the right, and the pressure sensor 4 will output a new value. Compared with the pressure value when the tooth recognition is not successful, the pressure value is lower. The servo motor 21 stops rotating, and the spline half shaft is assembled. When the spline half shaft is disassembled, the cylinder 92 retracts, the positioning pin 93 and the positioning sleeve 71 separate, the floating plate 7 and the moving plate 6 separate relative to each other, and then the spline half shaft is clamped by the clamp. The screw module drives the clamp to retract, thereby pulling the spline half shaft out of the spline half shaft mounting sleeve 8.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A floating horizontal centering mechanism for a splined half-shaft, characterized in that, The device includes a rotating bushing, a movable plate and a floating plate connected to each other via a floating control component, a splined half-shaft mounting sleeve fixedly connected to the floating plate, a floating shaft with one end inserted into the rotating bushing and the other end passing through the movable plate and the floating plate in sequence and then connected to the splined half-shaft mounting sleeve, and a pressure sensor disposed between the rotating bushing and the floating shaft. The floating shaft can move relative to the rotating bushing along its own axis and can rotate relative to the splined half-shaft mounting sleeve. The floating plate is provided with a positioning sleeve with an opening facing the moving plate; The floating control assembly includes equal-height screws connecting the movable plate and the floating plate, a positioning pin disposed on the movable plate and capable of pneumatic extension and retraction to insert into the positioning sleeve, and an elastic locking element. The elastic locking component includes an elastic element, a first thrust bearing installed in reverse between the elastic element and the moving plate, and a second thrust bearing installed in reverse between the moving plate and the floating plate. The reverse installation means that after the first thrust bearing and the second thrust bearing are installed, the seat rings of both are close to the moving plate, and the shaft rings of both are far away from the moving plate.

2. The spline half-shaft floating horizontal centering mechanism as described in claim 1, characterized in that, The shape of the positioning pin corresponds to the shape of the positioning sleeve. The positioning pin is a cone, and the tip of the cone faces the floating plate.

3. The spline half-shaft floating horizontal centering mechanism as described in claim 1, characterized in that, The floating plate is rotatably connected to the floating shaft via a deep groove ball bearing.

4. The spline half-shaft floating horizontal centering mechanism as described in claim 1, characterized in that, The floating shaft includes a universal joint, a main shaft connected to one end of the universal joint, and a sealing plate connected to the other end of the universal joint. The sealing plate has several guide holes, and the rotating bushing is provided with a guide pin that is inserted into the guide hole along the axial direction of the floating shaft.

5. The spline half-shaft floating horizontal centering mechanism as described in claim 1, characterized in that, The spline half-shaft mounting sleeve is a sleeve with open ends, its inner wall is covered with splines, and its outer wall is equipped with a spline half-shaft sensor that can be inserted into the sleeve.

6. The spline half-shaft floating horizontal centering mechanism as described in claim 1, characterized in that, It also includes a base plate, on which a linear guide rail parallel to the axis of the floating shaft is provided, and the moving plate is slidably connected to the linear guide rail.

7. The spline half-shaft floating horizontal centering mechanism as described in claim 1, characterized in that, The elastic element is a spring sleeved on the equal-height bolt.

8. The spline half-shaft floating horizontal centering mechanism as described in claim 1, characterized in that, It also includes a side plate and a drive structure disposed on the side plate, the drive structure being connected to a rotating bushing for driving the rotating bushing to rotate.

9. A spline half-shaft floating horizontal centering mechanism as described in claim 8, characterized in that, The drive structure includes a servo motor, a drive gear connected to the output end of the servo motor, and a transmission gear connected to the drive gear via a synchronous belt.

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