Shaft head inner cavity depth measuring device
By designing a special device for measuring the inner cavity depth of the shaft head of the constant speed universal joint transmission shaft of the microcar, the problems of low measurement accuracy and low inspection efficiency in the prior art are solved, and high-quality welding and rapid inspection are achieved.
Patent Information
- Application Number
- CN202421530399.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The prior art is difficult to accurately measure the inner cavity depth of the shaft head of the constant speed universal joint transmission shaft of the mini-car, resulting in poor welding quality and low inspection efficiency.
A shaft head inner cavity depth measurement device is designed, using a structure combining an annular positioning boss and a measuring head. The measurement results are compared by the depth standard range marking line on the measuring rod to determine whether the inner cavity depth of the shaft head inner cavity is qualified.
It realizes accurate measurement of the inner cavity depth of the shaft head, improves welding quality and inspection efficiency, simplifies the operation process, and enhances the workpiece pass rate.
Smart Images
Figure CN222761541U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a device for measuring the inner cavity depth of a shaft head, in particular to a special measuring tool for measuring the inner cavity depth of a shaft head of a constant velocity universal joint transmission shaft of a mini car. Background Art
[0002] The hollow shaft workpiece in the constant velocity universal joint drive shaft of a mini car is an important part of the constant velocity universal joint drive shaft of a mini car. The two ends of the hollow shaft are welded with shaft heads. The large end of the shaft head workpiece has a hollow inner cavity. The depth of the inner cavity directly affects the strength and accuracy of the hollow shaft and the shaft head after welding. Because when welding by a friction welding machine, the friction welding machine automatically ensures that the total length of the workpiece is consistent with the designed length. When the inner cavity depth dimension exceeds the tolerance, that is, the large end of the shaft head is longer than the designed dimension, the friction welding weld flange will increase, and the weld will deviate to one side of the hollow tube, affecting the normal weld. Position; on the contrary, when the shaft head inner cavity depth is shallow, the friction welding weld flange will be reduced, the weld will shift to one side of the shaft head, and it will also affect the normal position of the weld. The inner cavity depth exceeds the design standard, which will lead to the friction welding size and the friction welding flange size. Therefore, the shaft head workpiece inner cavity depth value should be checked when purchasing. At present, the shaft head workpiece inner cavity depth is measured using a depth gauge. The end face of the depth gauge is a straight face, while the shaft head workpiece inner cavity is an arc shape. The measurement accuracy is often reduced due to inaccurate contact between the end face of the depth gauge and the shaft head workpiece inner cavity, which affects the welding quality and has low inspection efficiency. Summary of the invention
[0003] The utility model aims to provide a shaft head inner cavity depth measuring device, which can accurately measure the shaft head inner cavity size, thereby improving the quality of subsequent friction welding, and is simple and convenient to operate, thereby improving the efficiency of shaft head workpiece incoming inspection.
[0004] The technical scheme of the utility model is: a device for measuring the depth of the inner cavity of the shaft head, comprising a main body of the measuring device and a measuring rod, the front end of the main body is provided with an annular positioning boss, the annular positioning boss is provided with a main body groove that is tightly fitted with the end face of the large end of the shaft head, the rear end face of the main body is perpendicular to the axial center line of the main body, an axial through hole is provided in the main body, the front end of the measuring rod is provided with a measuring head that is in contact with the circular arc surface of the inner cavity of the shaft head, the rear end of the measuring rod is slidably connected in the axial through hole of the main body, a depth standard range mark is provided on the rod body at the rear end of the measuring rod, the depth standard range mark comprises an upper limit mark line and a lower limit mark line, and the upper limit mark line and the lower limit mark line are parallel to the rear end face of the main body.
[0005] The measuring rod is provided with a strip groove parallel to the axis of the measuring rod. The length range of the strip groove is greater than the range from the upper limit marking line to the lower limit marking line of the depth standard. One end of the control pin is placed in the strip groove, and the other end of the control pin is connected to the main body of the measuring device by a thread.
[0006] When in use, the rear end face of the main body is compared with the upper and lower limit marking lines on the measuring rod to determine whether the depth of the shaft head inner cavity is qualified. The principle is that the rear end face of the main body is used as the measured length, which is equal to the sum of the actual depth value of the measured shaft head inner cavity and the effective length value of the main body. The upper and lower limit marking lines on the measuring rod are used as the control value range, which is equal to the sum of the standard depth range value of the shaft head inner cavity and the effective length value of the main body. The rear end face of the main body is parallel to the upper and lower limit marking lines. Under the condition that the effective length value of the main body remains unchanged, the actual depth value is compared with the standard depth range value to display whether the actual depth value is qualified.
[0007] The advantages of the utility model are: the measuring device body is sleeved on the large end of the shaft head workpiece through the main body groove, so that its connection is stable, and it is very convenient to install, disassemble and use, which is conducive to measurement; the shape of the measuring head is consistent with the shape of the inner cavity of the shaft head workpiece, so that a close fit can be achieved and defects such as measurement errors are eliminated; the measurement result can be seen when the main body and the shaft head workpiece are connected together, and no reading is required, so it is convenient for operators to measure and improves the efficiency of incoming inspection; if the rear end face of the main body is relative to the standard range of the depth of the measuring rod, it is qualified, otherwise it is unqualified. The simple structure and simple operation of the device can achieve accurate measurement, improve the qualified rate of the measured workpiece, and thus ensure the quality of the subsequent friction welding process. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The utility model is a structural schematic diagram of a device for measuring the inner cavity depth of a shaft head.
[0009] Figure 2 yes Figure 1 Left view of .
[0010] Figure 3 It is a structural diagram of the shaft head workpiece.
[0011] Figure 4 It is a schematic diagram of the qualified state of the shaft head inner cavity depth measurement.
[0012] Figure 5 It is a schematic diagram of an unqualified state of measuring the inner cavity depth of the shaft head.
[0013] In the figure: 1 measuring head, 2 main body groove, 3 annular positioning boss, 4 main body, 5 measuring rod, 6 strip groove, 7 upper limit marking line, 8 lower limit marking line, 9 control pin, 10, rear end face of main body, 11 shaft head center hole, 12 shaft head small end neck, 13 shaft head large end, 14 shaft head inner cavity, 15 shaft head large end end face. DETAILED DESCRIPTION
[0014] The utility model discloses a shaft head inner cavity depth measuring device, which is used in the shaft head workpiece inspection process in the incoming inspection of the components of the constant velocity universal joint transmission shaft of a mini car. Figure 1 - Figure 5 As shown, there is a main body 4 with a measuring device, a ring-shaped positioning boss 3 is provided at the front end of the main body 4, and a main body groove 2 is provided in the ring-shaped positioning boss, and the main body groove is sleeved on the large end 13 of the shaft head (the shaft head is also called the shaft head workpiece), and the bottom surface of the groove is tightly fitted with the end surface 15 of the large end of the shaft head, so that the depth measuring device can be stably and tightly connected to the measured shaft head workpiece, so as to facilitate measurement; the rear end face 10 of the main body is perpendicular to the main body axis, and an axial through hole is provided in the main body, and a slidingly connected measuring rod 5 is installed in the axial through hole, and the front end of the measuring rod extends out of the main body and is provided with a measuring head 1, which is an arc surface, and the arc surface is opposite to the arc surface of the shaft head inner cavity 14 and is in matching contact, so as to make the starting point of the measurement accurate, and the shape of the measuring head is consistent with the shape of the inner cavity of the shaft head workpiece, so as to eliminate defects such as measurement errors; a depth standard range mark is provided on the measuring rod, and the depth standard range mark includes an upper limit mark line 7 and a lower limit mark line 8, and the upper limit mark line and the lower limit mark line are parallel to the rear end face of the main body. A strip groove 6 is provided on the measuring rod, which is parallel to the axis of the measuring rod. The length range of the strip groove is greater than the range from the upper limit marking line to the lower limit marking line. One end of the control pin 9 is placed in the strip groove, and the other end is threadedly connected to the main body of the measuring device. The function of the control pin is to prevent the measuring rod from detaching from the main body of the measuring device.
[0015] The working process is: place the annular positioning boss of the shaft head inner cavity depth measuring device on the large end of the shaft head workpiece, so that the bottom surface of the main body groove fits tightly with the end surface of the large end of the shaft head workpiece, and the main body groove can surround the large end of the shaft head to make the measuring device firmly connected to the shaft head workpiece and eliminate the gap, manually press the end face of the measuring rod, and the measuring rod slides forward in the axial through hole until the measuring head fits tightly with the arc surface of the shaft head inner cavity, and then compare the position with the rear end face of the main body according to the upper limit marking line and the lower limit marking line to judge whether the shaft head inner cavity depth is qualified. When the rear end face of the main body is opposite to the upper limit marking line or the lower limit marking line or the rear end face of the main body is opposite to any point between the upper and lower limit marking lines, it indicates that the shaft head inner cavity depth is qualified, and when the rear end face of the main body is outside the upper limit marking line or the lower limit marking line, it indicates that the shaft head inner cavity depth is unqualified.
Claims
1. A device for measuring the inner cavity depth of a shaft head, characterized in that: The invention comprises a main body (4) and a measuring rod (5) of a measuring device, wherein the front end of the main body is provided with an annular positioning boss (3), the annular positioning boss is provided with a main body groove (2) which is tightly fitted with the large end face (15) of the shaft head, the rear end face (10) of the main body is perpendicular to the main body axis, an axial through hole is provided in the main body, the front end of the measuring rod is provided with a measuring head (1) which is in contact with the circular arc surface of the inner cavity of the shaft head, the rear end of the measuring rod is slidably connected in the axial through hole of the main body, and a depth standard range mark is provided on the rod body at the rear end of the measuring rod, the depth standard range mark comprises an upper limit mark line (7) and a lower limit mark line (8), and the upper limit mark line and the lower limit mark line are parallel to the rear end face of the main body.
2. The device for measuring the inner cavity depth of a shaft head according to claim 1, characterized in that: The measuring rod (5) is provided with a strip groove (6) parallel to the axis of the measuring rod, the length range of the strip groove is greater than the range from the upper limit mark line to the lower limit mark line of the depth standard, one end of the control pin (9) is placed in the strip groove, and the other end of the control pin is connected to the main body of the measuring device through a thread.