A special inspection tool for measuring the play of a constant velocity joint

Abstract

The present invention relates to a special inspection tool for measuring the clearance of a ball cage, comprising a base plate, a tensioning mechanism, and a quick clamp. The tensioning mechanism is fixed on the base plate, and the ball cage is fixed on the tensioning mechanism. A pressure block is provided on the upper part of the ball cage, and is clamped and fixed by the quick clamp and a locking nut. A push-pull dynamometer is provided on one side of the tensioning mechanism, and a dial indicator is provided on the other side. A foot is provided at the bottom of the base plate. The beneficial effect of the present invention is that the present invention uses a push-pull dynamometer to load a fixed push-pull force, and uses a dial indicator to read the value, which increases the credibility. While truly measuring the clearance in the special-shaped ball channel of the ball cage, mechanical movement is used instead of manual feel thrust, so that the human influence factors are controlled and the data is more real. During the measurement process, there is no need for manual measurement by feel, which reduces the labor intensity, improves the safety factor, and provides a theoretical basis for the recalibration and balance of the transmission shaft.

Description

Technical Field

[0001] The present invention relates to the structure of a measuring fixture, and in particular to a special fixture for measuring the clearance of a ball cage. Background Art

[0002] Measuring the clearance of a ball cage is the lateral clearance between the steel balls and the special-shaped ball track. The existing detection method is to judge the tightness of the sliding of the inner spline sleeve in the special-shaped ball track in the ball cage by hand feeling. If the sliding is loose, it indicates a large clearance, and if the sliding is tight, it indicates a small clearance. Due to various errors such as indexing, shape, and position in the special-shaped ball track of the ball cage, it is a bit far-fetched to judge the size of the ball cage clearance only by looseness and tightness. Judging by hand feeling lacks data support and is not persuasive. Different people have different hand feelings, and human factors interfere with the judgment. Applying force by hand poses a safety risk. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned drawbacks of the prior art and provides a special fixture for measuring the clearance of a ball cage that is more scientific and safer.

[0004] The technical solution adopted by the present invention to solve its technical problems: This special fixture for measuring the clearance of a ball cage includes a bottom plate, a tensioning mechanism, and a quick clamp. The tensioning mechanism is fixed on the bottom plate, the ball cage is fixed on the tensioning mechanism, a pressure block is provided on the upper part of the ball cage, and it is fixed by a quick clamp and a locking nut. A push-pull force gauge is provided on one side of the tensioning mechanism, a dial indicator is provided on the other side, and feet are provided at the bottom of the bottom plate.

[0005] The tensioning mechanism includes a tensioning mandrel, a tensioning base, a tensioning screw, and a lever. The tensioning mandrel is located at the center of the tensioning base, the ball cage is sleeved on the tensioning mandrel, a support is provided at the middle part of the lever and fixed on the bottom plate, one end of the lever is connected to the tensioning screw, and the other end is connected to the bottom of the tensioning mandrel.

[0006] The measuring end of the dial indicator is in contact with the outer side of the ball cage. The dial indicator is fixed on the gauge rod by a locking screw, the gauge rod is connected and fixed to the gauge frame, and the gauge frame is fixed on the bottom plate.

[0007] The push-pull force gauge is installed on a bearing mounting seat, the bearing mounting seat is fixed on the bottom plate, a positioning slideway and a clearance adjusting screw for the sliding of the push-pull force gauge are provided on the bearing mounting seat, and an internally threaded vertical plate and a screw are provided in combination on one side of the bearing mounting seat. The end of the screw passes through the internally threaded vertical plate and contacts the push-pull force gauge.

[0008] A collar is sleeved outside the ball cage, and the measuring end of the push-pull force gauge is connected to the collar.

[0009] The beneficial effects of the present invention are as follows: By using a push-pull force gauge to apply a fixed-value push-pull force and cooperating with a dial indicator for reading, the present invention uses numerical values to speak, increasing credibility. While truly measuring the clearance in the special-shaped ball track of the constant velocity joint, it uses mechanical movement to replace the manual feel of the thrust, controlling the human influencing factors and making the data more real. During the measurement process, there is no need for manual measurement by feel, reducing the labor intensity and improving the safety factor, providing a theoretical basis for the re-calibration balance of the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic top view structure diagram of the present invention;

[0011] Figure 2 is a schematic front sectional view structure diagram of the present invention.

[0012] Description of the reference numerals in the drawings: Quick clamp 1, Constant velocity joint 2, Tightening mandrel 3, Tightening base 4, Inner-thread vertical plate 5, Screw 6, Base plate 7, Foot 8, Clearance adjusting screw 9, Positioning slideway 10, Support 11, Lever 12, Tightening screw 13, Dial indicator 14, Ring 15, Pressure block 16, Gauge stand 17, Locking nut 18, Push-pull force gauge 19, Bearing mounting seat 20, Locking screw 21, Gauge rod 22. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be further described below in conjunction with the drawings:

[0014] As shown in the figure, this special fixture for measuring the clearance of the constant velocity joint includes a base plate 7, a tightening mechanism, and a quick clamp 1. The tightening mechanism is fixed on the base plate 7, the constant velocity joint 2 is fixed on the tightening mechanism, a pressure block 16 is provided on the upper part of the constant velocity joint 2 and is fixed by the quick clamp 1 and the locking nut 18. A push-pull force gauge 19 is provided on one side of the tightening mechanism, a dial indicator 14 is provided on the other side, and feet 8 are provided at the bottom of the base plate 7.

[0015] The tightening mechanism includes a tightening mandrel 3, a tightening base 4, a tightening screw 13, and a lever 12. The tightening mandrel 3 is located at the center of the tightening base 4, the constant velocity joint 2 is sleeved on the tightening mandrel 3, a support 11 is provided at the middle part of the lever 12 and is fixed on the base plate 7. One end of the lever 12 is connected to the tightening screw 13, and the other end is connected to the bottom of the tightening mandrel 3.

[0016] The measuring end of the dial indicator 14 is in contact with the outer side of the constant velocity joint 2. The dial indicator 14 is fixed on the gauge rod 22 by a locking screw 21. The gauge rod 22 is connected and fixed to the gauge stand 17, and the gauge stand 17 is fixed on the base plate 7.

[0017] The push-pull force gauge 19 is installed on the bearing mounting base 20, and the bearing mounting base 20 is fixed on the bottom plate 7. The bearing mounting base 20 is provided with a positioning slideway 10 for the push-pull force gauge 19 to slide and a clearance adjusting screw 9. One side of the bearing mounting base 20 is provided with a combined internal-thread vertical plate 5 and a screw rod 6. The end of the screw rod 6 passes through the internal-thread vertical plate 5 and contacts the push-pull force gauge 19. A ferrule 15 is sleeved outside the constant velocity joint 2, and the measuring end of the push-pull force gauge 19 is connected to the ferrule 15.

[0018] The constant velocity joint 2 is placed into the tensioning base 4. Rotate the tensioning screw rod 13 counterclockwise. The tensioning mandrel 3 acts through the lever 12 to tension the workpiece. Pull the quick clamp. The quick clamp presses the constant velocity joint 2 from top to bottom, so that the end face of the constant velocity joint fits with the plane of the tensioning base 4, avoiding the upward lift of the constant velocity joint 2 when it is stressed. After the installation of the constant velocity joint 2 is completed, then turn over the dial indicator rod that can be flipped 120 degrees (for easy loading and unloading of the constant velocity joint). The rod 22 of the dial indicator is turned over to the limit position of the dial indicator frame 17. At this time, the dial indicator head is in a horizontal position and contacts the outer circle of the constant velocity joint. Rotate the right screw rod clockwise to make the push-pull force gauge 19 move leftward. When the ferrule 15 connected to the push-pull force gauge 19 contacts the outer circle of the constant velocity joint and is stressed, stop loading when the push-pull force gauge 19 shows the thrust required by the technical requirements. Adjust the pressing amount of the dial indicator to the integer position of 1 mm, and zero the dial indicator. Rotate the right screw rod 6 counterclockwise, and use the pulling-back function of the push-pull force gauge to make the ferrule pull the constant velocity joint to move rightward. Stop when it reaches the same measuring force as before. The difference in the values read by the dial indicator is the clearance of the constant velocity joint.

[0019] By performing fixed-value loading of the push-pull force through the push-pull force gauge and reading the values in cooperation with the dial indicator, and speaking with numbers, the credibility is increased. While truly measuring the clearance in the special-shaped ball track of the constant velocity joint, using mechanical movement to replace the manual feeling of thrust controls the human influencing factors, and the data is more real. During the measurement process, there is no need for manual measurement by hand feeling, reducing the labor intensity and improving the safety factor, providing a theoretical basis for the re-calibration balance of the drive shaft.

[0020] The present invention corrects the concept misplacement, achieves the true meaning of the clearance measurement of the constant velocity joint, replaces the manual feeling with data, improves the persuasion power, eliminates the human influencing factors through mechanical movement and the constant push-pull force of the push-pull force gauge. The constant velocity joint is installed on the tensioning base, and after tensioning, it is pressed tightly by the quick clamp, and the safety level is improved.

[0021] The present invention can be used as a special fixture for measuring the clearance of the constant velocity joint. By tensioning the internal spline of the constant velocity joint and using the push-pull force gauge to load fixed push-pull forces before and after, the lateral clearance of the steel balls in different ball tracks of the special-shaped ball track is measured, thereby improving the quality of the re-calibration balance of the drive shaft.

[0022] Except for the above-mentioned embodiments, the present invention can also have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A special inspection tool for measuring the clearance of a constant velocity joint, comprising a base plate (7), a tensioning mechanism, and a quick clamp (1), characterized in that: The tensioning mechanism is fixed on the bottom plate (7), the constant velocity joint (2) is fixed on the tensioning mechanism, a pressing block (16) is arranged on the upper part of the constant velocity joint (2), and it is fixed by a quick clamp (1) and a lock nut (18). A push-pull force gauge (19) is arranged on one side of the tensioning mechanism, a dial indicator (14) is arranged on the other side, and feet (8) are arranged at the bottom of the bottom plate (7). The tensioning mechanism includes a tensioning mandrel (3), a tensioning base (4), a tensioning screw (13) and a lever (12). The tensioning mandrel (3) is located at the center of the tensioning base (4), the constant velocity joint (2) is sleeved on the tensioning mandrel (3), a support (11) is arranged at the middle part of the lever (12) and fixed on the bottom plate (7), one end of the lever (12) is connected to the tensioning screw (13), and the other end is connected to the bottom of the tensioning mandrel (3). The measuring end of the dial indicator (14) is in contact with the outer side of the constant velocity joint (2). The dial indicator (14) is fixed on the gauge rod (22) by a lock screw (21), the gauge rod (22) is connected and fixed to the gauge frame (17), and the gauge frame (17) is fixed on the bottom plate (7). The push-pull force gauge (19) is installed on the bearing mounting seat (20), the bearing mounting seat (20) is fixed on the bottom plate (7). A positioning slideway (10) and a clearance adjusting screw (9) for the sliding of the push-pull force gauge (19) are arranged on the bearing mounting seat (20). An internally threaded vertical plate (5) and a screw (6) are combined on one side of the bearing mounting seat (20), and the end of the screw (6) passes through the internally threaded vertical plate (5) and contacts the push-pull force gauge (19). A collar (15) is sleeved outside the constant velocity joint (2), and the measuring end of the push-pull force gauge (19) is connected to the collar (15). During measurement, the constant velocity joint (2) is placed into the tensioning base (4). Rotate the tensioning screw (13) counterclockwise, and the tensioning mandrel (3) tightens the workpiece through the action of the lever (12). Pull the quick clamp, and the quick clamp presses the constant velocity joint (2) from top to bottom to make the end face of the constant velocity joint fit with the plane of the tensioning base (4). After the installation of the constant velocity joint (2) is completed, turn over the gauge rod of the dial indicator, and turn the gauge rod (22) to the limit position of the gauge frame (17). At this time, the dial head is in a horizontal position and contacts the outer circle of the constant velocity joint. Rotate the right screw clockwise to make the push-pull force gauge (19) move to the left. After the collar (15) connected to the push-pull force gauge (19) contacts the outer circle of the constant velocity joint and is stressed, stop loading when the push-pull force gauge (19) shows the thrust required by the technical requirements. Adjust the pressing amount of the dial indicator to an integer position of 1 mm, and zero the dial indicator. Rotate the screw (6) counterclockwise, and use the pulling-back function of the push-pull force gauge to make the collar pull the constant velocity joint to move to the right. Stop when it reaches the same measuring force as before, and the difference in the values read by the dial indicator is the clearance of the constant velocity joint.

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