Detection tool for measuring form and location tolerance of outer cylinder of oil damper for railway vehicle

Abstract

A detection tool for measuring the form and location tolerance of an outer cylinder of an oil damper for a railway vehicle relates to the technical field of rail transit dampers, and can effectively improve the operation reliability and prolong the service life of the damper. In the detection tool for measuring the form and location tolerance of the outer cylinder of the oil damper for the railway vehicle, a first thread matched with the end face of an outer cylinder barrel is arranged in the radial direction of a fixed reference block; the fixed reference block is provided with two arc grooves; a positioning shaft is arranged in the middle of the fixed reference block; the movable measuring block is provided with a mounting groove, the side surface corresponding to the mounting groove is provided with a fastening bolt, and the fastening bolt can be tightened to tightly press an adjusting nut on the dial indicator and fix the dial indicator; a positioning hole is formed in the middle of the movable measuring block; the shaft sleeve of the dial indicator is provided with a second thread, the second thread is matched with the adjusting nut, and the installation height of the dial indicator can be adjusted by screwing the adjusting nut; and the adjusting nut is placed in the mounting groove of the movable measuring block and is pressed by the fastening bolt.

Description

Technical Field

[0001] This invention relates to the field of vibration damper technology for rail transit, and in particular to a testing fixture for measuring the form and position tolerances of the outer cylinder of a hydraulic vibration damper for rail vehicles. Background Technology

[0002] Currently, hydraulic shock absorbers are key components on rail vehicles, and their performance directly affects the ride comfort and safety of rail vehicles.

[0003] In recent years, with the rapid development of high-speed railway technology in my country, the speed of rail vehicles has been continuously increasing, and the requirements for the safety and stability of vibration dampers have become increasingly stringent. Against this backdrop, the requirements for vibration damper manufacturing processes and component dimensional tolerances have also become increasingly stringent.

[0004] As the carrier of the damping function of the shock absorber, the perpendicularity of the end thread of the outer cylinder to the base plays an important role in the stability of the shock absorber's operation. If the requirement is not met, it will cause the piston rod of the shock absorber to deviate relative to the oil seal, which will lead to uneven wear of the piston rod or even oil leakage, seriously affecting the service life and stability of the shock absorber.

[0005] Specifically, in existing technology, a bottom valve, an inner cylinder, and a guide cover are sequentially mounted on the outer cylinder base of the shock absorber. Finally, a lock nut is used to fix and tighten the outer cylinder by connecting it to the threaded end of the outer cylinder. When the perpendicularity deviation between the outer cylinder base and the threaded end is too large, it will cause the inner cylinder to tilt. Consequently, the piston running in the inner cylinder and the piston rod connected to the piston will also tilt, leading to eccentric wear of the piston rod. Furthermore, the outer cylinder is welded from an outer cylinder seat and an outer cylinder body. The outer cylinder seat generally has two structural types: conical and flat. The perpendicularity of its thread to the outer cylinder end face cannot be directly measured.

[0006] Therefore, how to provide a testing fixture for measuring the form and position tolerances of the outer cylinder of a hydraulic shock absorber for rail vehicles, which can ensure the controllable perpendicularity of the outer cylinder seat and the thread on the end face of the outer cylinder, and effectively ensure the coaxiality of the internal components of the shock absorber, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a testing fixture for measuring the form and position tolerance of the outer cylinder of a hydraulic shock absorber for rail vehicles, which can effectively improve the reliability and service life of the shock absorber.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A testing fixture for measuring the form and position tolerances of the outer cylinder of a hydraulic shock absorber for rail vehicles includes: a fixed reference block, a movable measuring block, and a dial indicator; The fixed reference block has a first thread in the radial direction that mates with the end face of the outer cylinder body; the fixed reference block has two arc grooves, and the arc grooves are used for the rotational displacement when the dial indicator is measuring; a positioning shaft is provided in the middle of the fixed reference block; The movable measuring block has a mounting slot for placing the dial indicator, and a fastening bolt is provided on the side corresponding to the mounting slot. Tightening the fastening bolt can press the adjusting nut on the dial indicator and fix the dial indicator; a positioning hole is provided in the middle of the movable measuring block. The bushing of the dial indicator has a second thread, and the second thread mates with the adjusting nut. The installation height of the dial indicator can be adjusted by turning the adjusting nut. The adjusting nut is placed in the mounting groove of the movable measuring block and is tightened by the fastening bolt. During measurement, first, adjust the dial indicator's adjusting nut to the corresponding position according to the outer cylinder size to determine the dial indicator's installation height; then, place the dial indicator's adjusting nut in the mounting groove of the movable measuring block and tighten the fastening bolt to fix the dial indicator; tighten the fixed reference block onto the thread on the end face of the outer cylinder body; then insert the dial indicator's measuring rod into the arc groove of the fixed reference block, while simultaneously inserting the fixed reference block's positioning shaft into the positioning hole of the movable measuring block; press and rotate the movable measuring block, and move it within the arc groove of the fixed reference block, observing the maximum reading of the dial indicator to measure the perpendicularity of the outer cylinder seat to the end face thread of the outer cylinder body.

[0009] Compared with existing technologies, the inspection fixture for measuring the form and position tolerances of the outer cylinder of a hydraulic shock absorber for rail vehicles described in this invention has the following advantages: The inspection fixture for measuring the form and position tolerance of the outer cylinder of the hydraulic shock absorber for rail vehicles provided by this invention can ensure that the perpendicularity of the end face threads of the outer cylinder seat and the outer cylinder body is controllable, and effectively ensure the coaxiality of the internal components of the shock absorber, thereby effectively improving the reliability and service life of the shock absorber. Attached Figure Description

[0010] Figure 1 This is a cross-sectional structural schematic diagram of the inspection fixture for measuring the form and position tolerance of the outer cylinder of a hydraulic shock absorber for rail vehicles provided in an embodiment of the present invention. Figure 2 This is a cross-sectional view of the fixed reference block in the inspection fixture for measuring the form and position tolerance of the outer cylinder of a hydraulic shock absorber for rail vehicles provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the fixed reference block in the inspection fixture for measuring the form and position tolerance of the outer cylinder of a hydraulic shock absorber for rail vehicles provided in an embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of the moving measuring block in the inspection fixture for measuring the form and position tolerance of the outer cylinder of a hydraulic shock absorber for rail vehicles provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the moving measuring block in the inspection fixture for measuring the form and position tolerance of the outer cylinder of a hydraulic shock absorber for rail vehicles provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the dial indicator in the testing fixture for measuring the form and position tolerance of the outer cylinder of a hydraulic shock absorber for rail vehicles provided in an embodiment of the present invention.

[0011] Figure label: 1-Outer cylinder seat; 2-Outer cylinder body; 3-Fixed reference block; 4-Moving measuring block; 5-Dial indicator; 31-Circular groove; 32-Positioning shaft; 41-Mounting groove; 42-Fasting bolt; 43-Positioning hole; 51-Adjusting nut; 52-Shaft sleeve; 53-Measuring rod. Detailed Implementation

[0012] For ease of understanding, the following description, in conjunction with the accompanying drawings, details the inspection fixture for measuring the form and position tolerances of the outer cylinder of a hydraulic shock absorber for rail vehicles provided in the embodiments of the present invention.

[0013] This invention provides a testing fixture for measuring the form and position tolerances of the outer cylinder of a hydraulic shock absorber for rail vehicles, such as... Figures 1-6 As shown, it includes: a fixed reference block 3, a movable measuring block 4, and a dial indicator 5; The fixed reference block 3 has a first thread in the radial direction that mates with the end face of the outer cylinder body 2; the fixed reference block 3 has two arc grooves 31, and the arc grooves 31 are used for the rotational displacement when the dial indicator 5 is measuring; a positioning shaft 32 is provided in the middle of the fixed reference block 3. The movable measuring block 4 has a mounting groove 41 for placing the dial indicator 5, and a fastening bolt 42 is provided on the side corresponding to the mounting groove 41. Tightening the fastening bolt 42 can press the adjusting nut 51 on the dial indicator 5 and fix the dial indicator 5; a positioning hole 43 is provided in the middle of the movable measuring block 4. The bushing 52 of the dial indicator 5 has a second thread, and the second thread mates with the adjusting nut 51. The installation height of the dial indicator 5 can be adjusted by turning the adjusting nut 51. The adjusting nut 51 is placed in the mounting groove 41 of the movable measuring block 4 and is tightened by the fastening bolt 42. During measurement, first, adjust the nut 51 of dial indicator 5 to the corresponding position according to the outer cylinder size to determine the installation height of dial indicator 5; then, place the adjusting nut 51 of dial indicator 5 in the mounting groove 41 of the movable measuring block 4, and tighten the fastening bolt 42 to fix dial indicator 5; tighten the fixed reference block 3 onto the thread on the end face of the outer cylinder body 2; then insert the measuring rod 53 of dial indicator 5 into the arc groove 31 of the fixed reference block 3, and at the same time, insert the positioning shaft 32 of the fixed reference block 3 into the positioning hole 43 of the movable measuring block 4; press and rotate the movable measuring block 4, and move the movable measuring block 4 within the arc groove 31 of the fixed reference block 3, observe the maximum value of the dial indicator 5 reading, and the perpendicularity of the end face thread of the outer cylinder seat 1 and the outer cylinder body 2 can be measured.

[0014] Compared with the prior art, the inspection fixture for measuring the form and position tolerance of the outer cylinder of the hydraulic shock absorber for rail vehicles described in this embodiment of the invention has the following advantages: The inspection fixture for measuring the form and position tolerance of the outer cylinder of the hydraulic shock absorber for rail vehicles provided in this embodiment of the invention can ensure that the perpendicularity of the end face threads of the outer cylinder seat and the outer cylinder body is controllable, and effectively ensure the coaxiality of the internal components of the shock absorber, thereby effectively improving the reliability and service life of the shock absorber.

[0015] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A testing fixture for measuring the form and position tolerances of the outer cylinder of a hydraulic shock absorber for rail vehicles, characterized in that, include: Fixed reference block, movable measuring block, and dial indicator; The fixed reference block has a first thread in its radial direction that mates with the end face of the outer cylinder body; The fixed reference block has two arc grooves, and the arc grooves are used for the rotational displacement when the dial indicator is measuring; a positioning shaft is provided in the middle of the fixed reference block; The movable measuring block has a mounting slot for placing the dial indicator, and a fastening bolt is provided on the side corresponding to the mounting slot. Tightening the fastening bolt can press the adjusting nut on the dial indicator and fix the dial indicator; a positioning hole is provided in the middle of the movable measuring block. The bushing of the dial indicator has a second thread, and the second thread mates with the adjusting nut. The installation height of the dial indicator can be adjusted by turning the adjusting nut. The adjusting nut is placed in the mounting groove of the movable measuring block and is tightened by the fastening bolt. During measurement, first, adjust the dial indicator's adjusting nut to the corresponding position according to the outer cylinder size to determine the dial indicator's installation height; then, place the dial indicator's adjusting nut in the mounting groove of the movable measuring block and tighten the fastening bolt to fix the dial indicator; tighten the fixed reference block onto the thread on the end face of the outer cylinder body; then insert the dial indicator's measuring rod into the arc groove of the fixed reference block, while simultaneously inserting the fixed reference block's positioning shaft into the positioning hole of the movable measuring block; press and rotate the movable measuring block, and move it within the arc groove of the fixed reference block, observing the maximum reading of the dial indicator to measure the perpendicularity of the outer cylinder seat to the end face thread of the outer cylinder body.

Images