Detection auxiliary device for automobile driving motor shaft

Abstract

The utility model provides a detection auxiliary device for an automobile driving motor shaft, and belongs to the technical field of automobile manufacturing. The problem that the accuracy of coaxiality detection of an existing driving motor shaft is insufficient is solved. The auxiliary detection device for the automobile driving motor shaft comprises a flat-plate-shaped bottom plate and a vertical plate vertically fixed to the bottom plate, balls are embedded in the side, located on the vertical plate, of the bottom plate, the bottom ends of the balls are connected with springs, the top ends of the balls protrude out of the upper surface of the bottom plate under the action of the springs, and a finger air cylinder is fixed to the vertical plate. Fingers of the finger air cylinder are oppositely arranged in the horizontal direction, and the space between the fingers is located over the balls. According to the detection auxiliary device, the accuracy of coaxiality detection of the automobile driving motor shaft is improved.

Description

Technical Field

[0001] This utility model belongs to the field of automobile manufacturing technology and relates to an auxiliary device for detecting automobile drive motor shafts. Background Technology

[0002] New energy vehicles output kinetic energy through drive motors. The motor shaft, a key component in power output, has high tolerance requirements. Coaxiality, or the degree of alignment, refers to the alignment of the measured axis of a part with a reference axis. Coaxiality tolerance is the allowable variation of the measured axis relative to the reference axis. The drive motor shaft includes two bearing sections, several spline sections, and a rotor assembly section. The two bearing sections serve as the assembly reference. When inspecting coaxiality, the two bearing sections are generally used as the reference to check the coaxiality of the spline sections. Spline section coaxiality generally refers to the coaxiality of the spline pitch circle.

[0003] Currently, when inspecting the coaxiality of a drive motor shaft, the bearings at both ends of the shaft are typically supported on a support frame before the coaxiality is measured. For example, a support frame for motor shaft coaxiality testing is disclosed in Chinese patent literature [Publication No.: CN114001631A]. However, when using this type of support frame to support the drive motor shaft, the shaft will bend under gravity, thus affecting the accuracy of the coaxiality test. Another method involves using top and bottom centers to press down on both ends of the drive motor shaft to position it. While placing the drive motor shaft vertically reduces the influence of gravity, the pressure generated during pressing can easily cause the shaft to bend, similarly affecting the accuracy of the coaxiality test. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an auxiliary device for detecting the coaxiality of an automotive drive motor shaft. The technical problem to be solved is how to improve the accuracy of coaxiality detection of the drive motor shaft.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] An auxiliary device for detecting the shaft of an automotive drive motor includes a flat base plate and a vertical plate fixed on the base plate. The device is characterized in that a ball bearing is embedded on one side of the vertical plate on the base plate, and a spring is connected to the bottom end of the ball bearing. Under the action of the spring, the top end of the ball bearing protrudes from the upper surface of the base plate. A finger cylinder is fixed on the vertical plate, with the fingers of the finger cylinder arranged horizontally opposite each other, and the space between the fingers located directly above the ball bearing.

[0007] The drive motor shaft includes a first spline stop, a second spline stop, a first bearing stop, a rotor assembly stop, and a second bearing stop arranged sequentially along the axial direction. A tapered center hole is located at the center of each end face of the drive motor shaft. In use, the testing auxiliary device is placed at the center of the gear measuring center's worktable. The drive motor shaft is then vertically inserted between the fingers of the finger cylinder, with the first spline stop facing upwards and the rotor assembly stop positioned between the fingers. When inserted downwards, the ball bearings are embedded in the lower center hole of the drive motor shaft and spring-loaded against the hole wall. The finger cylinder then clamps the rotor assembly stop of the drive motor shaft. This allows for the measurement of coaxiality using the gear measuring center. The ball bearings are used for centering, and the finger cylinders keep the drive motor shaft vertical during testing. Maintaining verticality using the ball bearings and finger cylinders prevents bending of the drive motor shaft, improving the accuracy of coaxiality testing.

[0008] In the aforementioned auxiliary device for detecting the shaft of the automotive drive motor, adjusting bolts are vertically inserted and threadedly connected above and below the finger cylinder on the upright plate. A dial indicator is fixed on the upright plate between the finger cylinder and the two adjusting bolts. The fixing rod of the dial indicator is vertically inserted in the upright plate. All adjusting bolts, all fixing rods of the dial indicator, and the finger cylinder are arranged in a straight line along a direction perpendicular to the base plate.

[0009] The testing auxiliary device is equipped with a calibration rod. The outer diameter of the calibration rod is equal to the maximum tolerance diameter of the rotor assembly of the drive motor shaft. The bottom end face of the calibration rod is perpendicular to its outer circumference, and a positioning hole is provided at the center of the bottom end face. Before measuring the drive motor shaft, the testing auxiliary device must be zeroed. During zeroing, the calibration rod is vertically placed between the fingers of the finger cylinder, with the ball bearing embedded in the positioning hole of the calibration rod. The bottom end face of the calibration rod rests against the upper surface of the base plate. Then, the finger cylinder is activated to clamp the calibration rod. Next, the two adjusting bolts are rotated so that the bottom ends of the adjusting bolts rest against the outer circumference of the calibration rod. The position of the dial indicator is then adjusted so that the probe of the dial indicator rests against the outer circumference of the calibration rod, and the pointer of the dial indicator is rotated to the zero mark. Finally, the finger cylinder is activated to release the calibration rod, and the calibration rod is removed. Next, install the drive motor shaft: Place the drive motor shaft vertically between the fingers of the finger cylinder with the first spline facing upwards, ensuring the ball bearings are embedded in the center hole at the bottom of the drive motor shaft. The bottom of the drive motor shaft rests against the upper surface of the base plate, and the outer circumference of the rotor assembly rests against the bottom end of the adjusting bolt. Both dial indicator probes rest against the outer circumference of the rotor assembly. Slightly rotate the adjusting bolt to make the readings of the two dial indicators the same. Then, the finger cylinder clamps the drive motor shaft. Next, the gear measuring center first measures the outer diameters of the first and second bearing sections to determine their centers. Then, using the centers of the first and second bearing sections as the measuring centers, measure the pitch circles of the first and second splines, calculating their coaxiality. Adjusting the positioning reference of the drive motor shaft using dial indicators and adjusting bolts improves the accuracy of the coaxiality measurement.

[0010] In the aforementioned auxiliary device for inspecting the automotive drive motor shaft, the adjusting bolts are symmetrically arranged about the finger cylinder, and the fixing rod of the dial indicator is also symmetrically arranged about the finger cylinder. This facilitates adjusting the drive motor shaft to a vertical position using the adjusting bolts and the dial indicator, thus simplifying the installation operation before measurement.

[0011] In the aforementioned auxiliary device for inspecting the automotive drive motor shaft, the upper dial indicator is positioned close to the upper adjusting bolt, and the lower dial indicator is positioned close to the lower adjusting bolt. This allows the dial indicators to more sensitively reflect the adjustment status of the adjusting bolt, thus facilitating the installation operation before measurement.

[0012] In the aforementioned auxiliary device for detecting the shaft of an automotive drive motor, a flat pad is fixedly connected to the bottom surface of the base plate, and the bottom end of the spring abuts against the pad.

[0013] The pad is designed to provide support for the spring, allowing the spring to provide a stable elastic force to pop out the top of the ball, thus facilitating the positioning of the drive motor shaft during measurement.

[0014] In the aforementioned auxiliary device for detecting the automotive drive motor shaft, the base plate has a stepped mounting hole with a smaller upper section and a larger lower section. The ball bearing is located at the upper part of the mounting hole, and the spring is located at the lower part. This reduces interference between the spring and the wall of the mounting hole, allowing the spring to move smoothly up and down, thus enabling the drive motor shaft to be positioned smoothly by the ball bearing.

[0015] In the aforementioned auxiliary device for detecting the shaft of an automotive drive motor, the bottom surface of the upright plate rests against the upper surface of the base plate. The base plate also has a countersunk hole with a stepped shape, wider at the bottom and narrower at the top. A fixing bolt for securing the base plate and the upright plate passes through the countersunk hole, and a pad seals the countersunk hole. This pad blocks the fixing bolt, preventing accidental loosening of the bolt and ensuring the accuracy of the detection.

[0016] In the aforementioned auxiliary device for detecting the automotive drive motor shaft, the pad has a stepped fixing hole with a smaller upper section and a larger lower section. A connecting bolt is inserted through the fixing hole to fix the pad and the base plate. This prevents the connecting bolt from protruding from the base plate and affecting the positioning of the drive motor shaft on the base plate.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] By using ball bearing centering and a finger cylinder to keep the drive motor shaft vertical during testing, the drive motor shaft will not bend, which improves the accuracy of coaxiality testing. Moreover, the testing auxiliary device has a simple structure and is easy to operate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the auxiliary device for detecting the shaft of the automotive drive motor.

[0020] Figure 2 This is a schematic diagram of the zeroing process of the auxiliary device for detecting the shaft of the automotive drive motor.

[0021] Figure 3 This is a schematic diagram of the measurement process using the auxiliary device for detecting the shaft of the automotive drive motor.

[0022] In the diagram, 1 is the base plate; 1a is the mounting hole; 1b is the countersunk hole; 2 is the upright plate; 3 is the ball bearing; 4 is the spring; 5 is the pad; 5a is the fixing hole; 6 is the finger cylinder; 6a is the finger; 7 is the adjusting bolt; 8 is the dial indicator; 8a is the fixing rod; 8b is the probe; 9 is the fixing bolt; 10 is the connecting bolt; 11 is the calibration rod; 11a is the positioning hole; 12 is the drive motor shaft; 12a is the center hole; 12b is the first spline stop; 12c is the second spline stop; 12d is the first bearing stop; 12e is the rotor assembly stop; 12f is the second bearing stop. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figure 1 As shown, an auxiliary device for detecting an automotive drive motor shaft includes a flat base plate 1 and a vertical plate 2 fixed on the base plate 1. A ball bearing 3 is embedded on one side of the vertical plate 2 on the base plate 1. A spring 4 is connected to the bottom end of the ball bearing 3, and under the action of the spring 4, the top end of the ball bearing 3 protrudes from the upper surface of the base plate 1. A finger cylinder 6 is fixed on the vertical plate 2. The fingers 6a of the finger cylinder 6 are arranged horizontally opposite each other, and the space between the fingers 6a is directly above the ball bearing 3. The finger cylinder 6, also known as a pneumatic finger 6a, is an existing product and can be purchased directly from the market. This embodiment uses a two-finger finger cylinder 6, with the two fingers 6a of the finger cylinder 6 arranged horizontally to facilitate the vertical insertion of the drive motor shaft 12 between the two fingers 6a of the finger cylinder 6.

[0025] like Figure 1 The base plate 1 has a stepped mounting hole 1a with a smaller upper diameter and a larger lower diameter. The ball bearing 3 is located at the upper part of the mounting hole 1a, and the spring 4 is located at the lower part of the mounting hole 1a. A flat pad 5 is fixedly connected to the bottom surface of the base plate 1, and the bottom end of the spring 4 abuts against the pad 5. The hole wall of the mounting hole 1a has a convex ring with a smaller diameter, which is smaller than the diameter of the ball bearing 3, thus preventing the ball bearing 3 from falling out of the mounting hole 1a. The bottom surface of the upright plate 2 abuts against the upper surface of the base plate 1. The base plate 1 also has a countersunk hole 1b with a smaller upper diameter and a larger lower diameter. A fixing bolt 9 for fixing the base plate 1 and the upright plate 2 passes through the countersunk hole 1b. The shank of the fixing bolt 9 passes through the countersunk hole 1b and is threaded to the upright plate 2. The pad 5 seals the countersunk hole 1b. There are several countersunk holes 1b, such as two or three, and each countersunk hole 1b is provided with a fixing bolt 9. The pad 5 has a stepped fixing hole 5a that is smaller at the top and larger at the bottom. A connecting bolt 10 is inserted through the fixing hole 5a to fix the pad 5 and the base plate 1. There are several fixing holes 5a, such as three or four, and each fixing hole 5a is provided with a connecting bolt 10.

[0026] like Figure 1As described, adjusting bolts 7 are vertically inserted and threadedly connected to the finger cylinder 6 above and below the upright plate 2. Dial gauges 8 are fixed between the finger cylinder 6 and the two adjusting bolts 7 on the upright plate 2. The fixing rods 8a of the dial gauges 8 are vertically inserted into the upright plate 2. All adjusting bolts 7, all fixing rods 8a of the dial gauges 8, and the finger cylinder 6 are arranged in a straight line perpendicular to the base plate 1. The adjusting bolts 7 and the fixing rods 8a of the dial gauges 8 are symmetrically arranged about the finger cylinder 6. The upper dial gauge 8 is close to the upper adjusting bolt 7, and the lower dial gauge 8 is close to the lower adjusting bolt 7. The adjusting bolts 7 are made of plastic or have a plastic head fixed to their bottom end to prevent them from scratching the workpiece.

[0027] like Figure 2 As shown, the testing auxiliary device is equipped with a straight rod-shaped verification rod 11. The outer diameter of the verification rod 11 is equal to the maximum tolerance diameter of the outer circle of the rotor assembly section 12e. The bottom surface of the verification rod 11 is perpendicular to the outer circumferential surface of the verification rod 11, and a positioning hole 11a is provided at the center of the bottom end surface of the verification rod 11.

[0028] Before measuring the drive motor shaft 12, the testing auxiliary device must be zeroed. First, place the testing auxiliary device at the center of the gear measuring center worktable, with the base plate 1 horizontal and the upright plate 2 vertical. During zeroing, vertically insert the calibration rod 11 between the fingers 6a of the finger cylinder 6, with the ball bearing 3 embedded in the positioning hole 11a of the calibration rod 11. The bottom end of the calibration rod 11 rests against the upper surface of the base plate 1. Then, activate the finger cylinder 6 to clamp the calibration rod 11. Next, rotate the two adjusting bolts 7 so that the bottom ends of the adjusting bolts 7 rest against the outer circumference of the calibration rod 11. Then, adjust the position of the dial indicator 8 so that the probe 8b of the dial indicator 8 rests against the outer circumference of the calibration rod 11, and rotate the pointer of the dial indicator 8 to the zero mark. Finally, activate the finger cylinder 6 to release the calibration rod 11 and remove it.

[0029] like Figure 3 As shown, an automotive drive motor shaft 12 is stepped and includes a first spline stop 12b, a second spline stop 12c, a first bearing stop 12d, a rotor assembly stop 12e, and a second bearing stop 12f arranged sequentially along the axial direction. The outer circle of the first spline stop 12b is provided with a straight tooth spline, and the outer circle of the second spline stop 12c is provided with a helical tooth spline. A center hole 12a is provided at the center of the end face at both ends of the drive motor shaft 12.

[0030] like Figure 3As shown, after zeroing, the drive motor shaft 12 is then installed. The drive motor shaft 12 is vertically placed between the fingers 6a of the finger cylinder 6 with the first splined stop 12b facing upwards, and the ball bearing 3 is embedded in the center hole 12a at the bottom end of the drive motor shaft 12. The bottom end of the drive motor shaft 12 rests against the upper surface of the base plate 1, the outer circumferential surface of the rotor assembly stop 12e abuts against the bottom end of the adjusting bolt 7, and the probes 8b of the two dial indicators 8 abut against the outer circumferential surface of the rotor assembly stop 12e. Then, the adjusting bolt 7 is slightly rotated to make the readings of the two dial indicators 8 the same; then the finger cylinder 6 is activated to clamp the drive motor shaft 12. Then, the gear measuring center first measures the outer diameter of the first bearing stop 12d and the outer diameter of the second bearing stop 12f to determine the center of the first bearing stop 12d and the center of the second bearing stop 12f. Then, using the center of the first bearing stop 12d and the center of the second bearing stop 12f as the measuring center, the pitch circles of the first spline and the second spline are measured, and the coaxiality of the first spline pitch circles and the second spline pitch circles is calculated. Afterwards, other configuration tolerances can be measured according to the drawing requirements.

[0031] When measuring the second bearing stop 12f, care should be taken to avoid the upright plate 2 to prevent the probe 8b at the gear measuring center from colliding with the upright plate 2. After the measurement is completed, the finger cylinder 6 will release the drive motor shaft 12. After removing the drive motor shaft 12, another drive motor shaft 12 will be inserted, and the installation and measurement steps will be repeated.

[0032] In this testing auxiliary device, the ball bearing 3 is used for centering, and the finger cylinder 6 is used to keep the drive motor shaft 12 in a vertical state for testing. When the ball bearing 3 and the finger cylinder 6 are used to keep the shaft in a vertical state, the drive motor shaft 12 will not bend, which improves the accuracy of coaxiality testing.

[0033] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An auxiliary device for detecting the shaft of an automotive drive motor, comprising a flat base plate (1) and a vertical plate (2) fixed on the base plate (1), characterized in that, A ball bearing (3) is embedded on one side of the upright plate (2) on the base plate (1). A spring (4) is connected to the bottom end of the ball bearing (3). Under the action of the spring (4), the top end of the ball bearing (3) protrudes from the upper surface of the base plate (1). A finger cylinder (6) is fixed on the upright plate (2). The fingers (6a) of the finger cylinder (6) are arranged opposite each other in the horizontal direction and the space between the fingers (6a) is located directly above the ball bearing (3).

2. The auxiliary device for detecting the shaft of an automotive drive motor according to claim 1, characterized in that, Adjusting bolts (7) are vertically inserted and threadedly connected above and below the finger cylinder (6) on the upright plate (2). A dial indicator (8) is fixed between the finger cylinder (6) and the two adjusting bolts (7) on the upright plate (2). The fixing rod (8a) of the dial indicator (8) is vertically inserted in the upright plate (2). All adjusting bolts (7), fixing rods (8a) of all dial indicators (8) and finger cylinder (6) are arranged in a straight line in a direction perpendicular to the base plate (1).

3. The auxiliary device for detecting the shaft of an automotive drive motor according to claim 2, characterized in that, The adjusting bolt (7) is symmetrically arranged about the finger cylinder (6), and the fixing rod (8a) of the dial indicator (8) is symmetrically arranged about the finger cylinder (6).

4. The auxiliary device for detecting the shaft of an automotive drive motor according to claim 2, characterized in that, The upper dial indicator (8) is close to the upper adjusting bolt (7), and the lower dial indicator (8) is close to the lower adjusting bolt (7).

5. The auxiliary device for detecting the shaft of an automotive drive motor according to any one of claims 1-4, characterized in that, A flat pad (5) is fixedly connected to the bottom surface of the base plate (1), and the bottom end of the spring (4) abuts against the pad (5).

6. The auxiliary device for detecting the shaft of an automotive drive motor according to claim 5, characterized in that, The base plate (1) has a mounting hole (1a) with a stepped shape that is smaller at the top and larger at the bottom. The ball (3) is located at the upper part of the mounting hole (1a), and the spring (4) is located at the lower part of the mounting hole (1a).

7. The auxiliary device for detecting the shaft of an automotive drive motor according to claim 5, characterized in that, The bottom surface of the upright plate (2) is attached to the upper surface of the base plate (1). The base plate (1) is also provided with a countersunk hole (1b) in the shape of a step with a smaller upper part and a larger lower part. A fixing bolt (9) for fixing the base plate (1) and the upright plate (2) is inserted in the countersunk hole (1b). The pad plate (5) closes the countersunk hole (1b).

8. The auxiliary device for detecting the shaft of an automotive drive motor according to claim 5, characterized in that, The pad (5) has a fixing hole (5a) with a stepped shape that is smaller at the top and larger at the bottom. A connecting bolt (10) for fixing the pad (5) and the base plate (1) is inserted through the fixing hole (5a).

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