Coaxiality measuring device for output shaft of diesel engine high pressure oil pump

Abstract

The present invention is mainly applied to the field of measurement technology, and particularly relates to a coaxiality measuring device for the output shaft of a diesel engine high-pressure oil pump, comprising a mandrel and a tapered sleeve, an outer sleeve is disposed outside the mandrel, a bearing is disposed between the mandrel and the outer sleeve, the mandrel and the outer sleeve are connected by a connecting assembly, a rotating disk is disposed at one end of the mandrel, a fixed meter frame is disposed on the rotating disk, a movable meter frame is disposed on the fixed meter frame, and a rotary locking clamp is disposed at the end of the movable meter frame. The coaxiality measuring device for the output shaft of a diesel engine high-pressure oil pump adopts a simulation measurement and a comprehensive measurement and detection method, and follows the closure principle and the Abbe principle among the four basic measurement principles, and can complete the simulation measurement of the coaxiality X-direction and Y-direction error of the rotation axis of the output shaft of the high-pressure oil pump relative to the rotation axis of the gearbox fuel injection pump gear shaft. After the simulation measurement is qualified, the diesel engine high-pressure oil pump can be directly installed on the fuel injection pump bracket without further alignment and measurement.

Description

Technical Field

[0001] The invention relates to a device for measuring the coaxiality of an output shaft of a high-pressure oil pump of a diesel engine, and is mainly used in the field of measurement technology. Background Art

[0002] The distance between the output shaft of the high-pressure oil pump installed on the diesel engine fuel injection pump bracket and the gear shaft of the fuel injection pump of the gear box is 300mm, and the connection between them is connected through a coupling and a connecting flange. If the coaxiality of the output shaft of the fuel injection pump and the gear shaft of the gear box fuel injection pump is too large, it often causes damage to the coupling, and in severe cases, it may also cause the injector output shaft gear to be broken or damaged, or the semicircular key at the taper of the gear box fuel injection pump gear shaft to break, and in severe cases, it may also cause the connecting flange to break, which seriously affects the factory quality of the diesel engine. In the past, the coaxiality of the output shaft of the high-pressure oil pump was corrected by using a magnetic base to absorb on the output shaft of the high-pressure oil pump, and the dial indicator probe was hit on the outer circle of the connecting flange of the gear box fuel injection pump gear shaft. The output shaft of the high-pressure oil pump was rotated 180° (it cannot be rotated 360°) by a wrench. Since the outer circle of the connecting flange of the fuel injection pump gear shaft is not concentric with the 1:5 taper inner hole required on the drawing, the measurement error of this coaxiality correction method is large.

[0003] This also illustrates a problem, that is, the measurement results of this method cannot truly reflect the actual detection data of the coaxiality between the high-pressure oil pump output shaft and the gear box injector gear shaft. In fact, its data has the opposite effect. Therefore, during the high-speed operation of the diesel engine, severe vibration and tremor will often occur. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device for measuring the coaxiality of an output shaft of a high-pressure oil pump of a diesel engine, which can improve the measuring accuracy and working efficiency and ensure the product quality of the diesel engine.

[0005] The diesel engine high-pressure oil pump output shaft coaxiality measuring device described in the present invention comprises a core shaft and a tapered sleeve, wherein an outer sleeve is disposed outside the core shaft, a bearing is disposed between the core shaft and the outer sleeve, the core shaft and the outer sleeve are connected via a connecting assembly, a rotating disk is disposed at one end of the core shaft, a fixed meter frame is disposed on the rotating disk, a movable meter frame is disposed on the fixed meter frame, and a rotary locking clamp is disposed at the end of the movable meter frame.

[0006] The bearing is installed at both ends between the core shaft and the outer sleeve, an end cover is arranged outside the bearing, a positioning protrusion is arranged on the core shaft corresponding to the end cover, the bearing is installed on the positioning protrusion, and a positioning groove is arranged on the inner wall of the outer sleeve corresponding to the bearing.

[0007] A hollow structure is axially arranged in the middle of the core shaft, and the end cover is respectively connected to the core shaft and the outer sleeve through fasteners.

[0008] The fixed meter frame is fixed on the rotating disk through fasteners, and the rotating disk is set as a circular disk.

[0009] The movable meter frame comprises a rotating meter frame and a movable meter frame, the movable meter frame is located below the fixed meter frame, and the rotating meter frame is respectively connected with the fixed meter frame and the movable meter frame through fasteners.

[0010] The fixed meter frame and the movable meter frame are both configured as cylindrical rods, and the rotating meter frame is configured as a rectangular parallelepiped structure.

[0011] The rotary locking clip is fixed to the end of the movable table frame through a fastener.

[0012] The tapered sleeve has an inner hole taper of 1:5.

[0013] The bearing is a deep groove ball bearing.

[0014] The middle part of the side wall of the outer shaft sleeve is concave.

[0015] The following principles are adopted during the measurement process of this device:

[0016] A. For the first time, the closure principle, one of the four basic principles of measurement, was followed and applied.

[0017] In the process of measuring the axial and radial coaxiality of the output shaft coaxiality measuring device of the diesel engine high-pressure oil pump, the dial indicator always takes data at the four positions of 0°, 90°, 180° and 270° of the circular division, and the sum of the numerical errors of the four intervals must be zero. In addition, the dial indicator needle is aligned with zero at the initial 0°, and must return to 0° after one rotation, and the dial indicator needle is still aligned with the zero position to be qualified. Therefore, its measurement process follows the closed principle, one of the four basic principles of measurement. The closed principle means that if the closed condition can be met during the measurement, the sum of the interval errors must be zero.

[0018] B. For the first time, Abbe's principle, one of the four basic principles of measurement, was applied.

[0019] To ensure the coaxiality is qualified, the extension line of the reference axis of the diesel engine high-pressure oil pump output shaft coaxiality measuring device must coincide with the axis of the injection pump gear shaft of the gearbox being measured within the error requirement range. Therefore, the measurement process follows the Abbe principle, one of the four basic measurement principles. The Abbe principle is a very important design principle in instrument design. The classical Abbe principle is a guiding principle for measuring instrument design proposed by Abbe in 1890. He said: "If the measurement has given an accurate measurement result, the measured piece must be arranged on the extension line of the reference element along the direction of movement."

[0020] C. The measuring device adopts a comprehensive measurement detection method.

[0021] The diesel engine high-pressure oil pump output shaft coaxiality measuring device is designed and manufactured using the principle and method of comprehensive gauges. Comprehensive gauges are a design method that simulates a certain design requirement, and can complete the inspection of the dimensional tolerance and coaxiality form and position error of the relevant parts of the rotation axis of the high-pressure oil pump output shaft relative to the rotation axis of the gearbox injection pump gear shaft. Comprehensive gauges are a design method that simulates a certain design requirement, and can complete the inspection of the dimensional tolerance and form and position error of the reference quantity relative to the measured quantity.

[0022] D. The measuring device adopts the detection method of analog measurement.

[0023] The R value of the outer sleeve of the coaxiality measuring device of the diesel engine high-pressure oil pump output shaft is the same as the R value of the diesel engine high-pressure oil pump, so the measuring device is used to simulate the diesel engine high-pressure oil pump for coaxiality detection. The process adopts the principle and method of analog measurement for design and production. That is, macro quantities are essentially fixed or continuously changing macro quantities, and the measurement of analog quantities or direct measurement of analog quantities is called analog measurement.

[0024] E. The axial positioning method of the measuring device adopts the "taper set screw positioning method".

[0025] The axial positioning of the rotating spindle of the diesel engine high-pressure oil pump output shaft coaxiality measuring device adopts the "taper set screw positioning method". First adjust the taper set screw, and after the axial clearance is adjusted, fix the nut of the taper set screw.

[0026] F. The combination meter stand adopts the "universal centering and alignment method".

[0027] The radial contact position of the dial indicator needle can be found by adjusting the rotating table frame; loosen the self-made nut and rotate the locking clamp 90° to perform simulated measurement of axial error.

[0028] G. Deep groove ball bearings use a design method for positioning the outer ring of the bearing, and the fit of the inner and outer rings of the deep groove ball bearings uses a high-precision M7 / h6 fit.

[0029] The beneficial effects of the present invention are:

[0030] The diesel engine high-pressure oil pump output shaft coaxiality measuring device adopts the simulation measurement and comprehensive measurement detection method, and follows the closure principle and Abbe principle of the four basic measurement principles. It can complete the simulation measurement of the axial and radial errors of the coaxiality of the high-pressure oil pump output shaft rotation axis relative to the injection pump gear shaft rotation axis of the gear box. After the simulation measurement is qualified, the diesel engine high-pressure oil pump can be directly installed on the injection pump bracket without alignment and measurement. This measurement method has high measurement accuracy and fast detection speed, filling a gap in this aspect of measurement technology. From the use situation, the effect is relatively ideal. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 It is a structural schematic diagram of radial coaxiality error measurement.

[0033] Figure 3 It is a structural schematic diagram of axial coaxiality error measurement.

[0034] In the figure: 1. outer sleeve; 2. core shaft; 3. bearing; 4. fixed meter stand; 5. rotating meter stand; 6. movable meter stand; 7. dial indicator; 8. locking clip; 9. rotating disk; 10. left end cover; 11. right end cover; 12. set screw; 13. fuel injection pump gear shaft; 14. fuel injection pump bracket. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings:

[0036] like Figure 1 to Figure 3 As shown, the coaxiality measuring device for the output shaft of a high-pressure oil pump of a diesel engine of the present invention comprises a mandrel 2 and a tapered sleeve, the mandrel 2 is covered with an outer sleeve 1, a bearing 3 is arranged between the mandrel 2 and the outer sleeve 1, the mandrel 2 and the outer sleeve 1 are connected by a connecting assembly, a rotating disk 9 is arranged at one end of the mandrel 2, a fixed meter frame 4 is arranged on the rotating disk 9, a movable meter frame is arranged on the fixed meter frame 4, and a rotary locking clamp 8 is arranged at the end of the movable meter frame. The bearing 3 is installed at both ends between the mandrel 2 and the outer sleeve 1, an end cover is arranged at the outside of the bearing 3, a positioning protrusion is arranged on the mandrel 2 corresponding to the end cover, the bearing 3 is arranged on the positioning protrusion, and a positioning groove is arranged on the inner side wall of the outer sleeve 1 corresponding to the bearing 3. A hollow structure is axially arranged in the middle of the mandrel 2, and the end cover is respectively connected to the mandrel 2 and the outer sleeve 1 through fasteners. The end cover is divided into a left end cover 10 and a right end cover 11. The right end cover 11 is fixed to the core shaft 2 by a set screw 12. The outer peripheries of the left end cover 10 and the right end cover 11 are connected to the outer sleeve 1 by fasteners. The core shaft 2 passes through the left end cover 10, and the rotating disk 9 is fixed to the end by fasteners. The fixed table frame 4 is fixed to the rotating disk 9 by fasteners, and the rotating disk 9 is set as a disc. The movable table frame includes a rotating table frame 5 and a movable table frame 6. The movable table frame 6 is located below the fixed table frame 4. The rotating table frame 5 is connected to the fixed table frame 4 and the movable table frame 6 by fasteners. The fixed table frame 4 and the movable table frame 6 are both set as cylindrical rods, and the rotating table frame 5 is set as a rectangular parallelepiped structure. The rotary locking clamp 8 is fixed to the end of the movable table frame by fasteners. The tapered sleeve adopts a tapered sleeve with an inner hole taper of 1:5. The bearing 3 adopts a deep groove ball bearing. The middle part of the side wall of the outer sleeve 1 is concave. The fasteners in this device can all be bolts or nuts.

[0037] The specific implementation of the coaxiality measuring device for the output shaft of a diesel engine high-pressure oil pump can be divided into the following four parts:

[0038] A. Measurement of radial error of coaxiality

[0039] First, place the diesel engine high-pressure fuel pump output shaft coaxiality measuring device on the fuel injection pump bracket 14, with the left end cover 10 of the measuring device against the end face of one side of the fuel injection pump bracket 14, and place the needle of the dial indicator 7 on the 1:5 taper outer circle of the fuel injection pump gear shaft 13 of the gear box by adjusting the rotating table frame 5, and take readings at the four positions of 0°, 90°, 180° and 270° of the taper outer circle circumference, and the maximum value is the radial error a of the coaxiality.

[0040] B. Measurement of axial error of coaxiality

[0041] Install a standard 1:5 taper sleeve on the 1:5 taper outer circle of the injection pump gear shaft 13 of the gear box. Loosen the nut that fixes the locking clamp 8, rotate the locking clamp 8 90°, and the needle contacts the standard 1:5 taper sleeve. Take data at the four positions of 0°, 90°, 180° and 270° of the circumferential division of the right end face of the standard 1:5 taper sleeve. The maximum value is the axial error b of the coaxiality.

[0042] C. Calculate the coaxiality error of the diesel engine high-pressure oil pump output shaft.

[0043] The coaxiality error is:

[0044] D. Install the diesel engine high pressure oil pump

[0045] (1) After multiple simulation measurements as above, and repeated adjustments of the upper, lower, left, and right positions of the fuel injection pump bracket 14, the four bolts of the fuel injection pump bracket 14 are tightened after the coaxiality is qualified.

[0046] (2) Finally, the diesel engine high-pressure fuel pump can be directly installed on the fuel injection pump bracket 14.

Claims

1. A device for measuring the coaxiality of the output shaft of a diesel engine high-pressure oil pump, characterized in that: The invention comprises a core shaft (2) and a tapered sleeve, wherein the core shaft (2) is covered with an outer sleeve (1), a bearing (3) is arranged between the core shaft (2) and the outer sleeve (1), the core shaft (2) and the outer sleeve (1) are connected via a connecting assembly, a rotating disk (9) is arranged at one end of the core shaft (2), a fixed meter frame (4) is arranged on the rotating disk (9), a movable meter frame is arranged on the fixed meter frame (4), and a rotary locking clamp (8) is arranged at the end of the movable meter frame; The bearings (3) are mounted at both ends between the core shaft (2) and the outer sleeve (1), an end cover is arranged outside the bearing (3), a positioning protrusion is arranged on the core shaft (2) corresponding to the end cover, the bearing (3) is mounted on the positioning protrusion, and a positioning groove is arranged on the inner wall of the outer sleeve (1) corresponding to the bearing (3); The movable meter frame comprises a rotating meter frame (5) and a movable meter frame (6), the movable meter frame (6) is located below the fixed meter frame (4), and the rotating meter frame (5) is connected to the fixed meter frame (4) and the movable meter frame (6) respectively through fasteners; The specific implementation of the coaxiality measuring device for the output shaft of a diesel engine high-pressure oil pump includes: A. Measurement of radial error of coaxiality First, a diesel engine high-pressure fuel pump output shaft coaxiality measuring device is placed on the fuel injection pump bracket (14), with the left end cover (10) of the measuring device leaning against the end surface of one side of the fuel injection pump bracket (14), and the needle of the dial indicator (7) is placed on the 1:5 taper outer circle of the fuel injection pump gear shaft (13) of the gear box by adjusting the rotating meter frame (5); B. Measurement of axial error of coaxiality Install a standard 1:5 taper sleeve on the 1:5 taper outer circle of the injection pump gear shaft (13) of the gear box, loosen the nut that fixes the locking clamp (8), and rotate the locking clamp (8) 90° until the gauge needle contacts the standard 1:5 taper sleeve.

2. The device for measuring the coaxiality of the output shaft of a diesel engine high-pressure oil pump according to claim 1, characterized in that: A hollow structure is axially arranged in the middle of the core shaft (2), and the end cover is respectively connected to the core shaft (2) and the outer sleeve (1) via fasteners.

3. The device for measuring the coaxiality of the output shaft of a diesel engine high-pressure oil pump according to claim 1, characterized in that: The fixed meter frame (4) is fixed on the rotating disk (9) by means of fasteners, and the rotating disk (9) is configured as a circular disk.

4. The device for measuring the coaxiality of the output shaft of a diesel engine high-pressure oil pump according to claim 1, characterized in that: The fixed meter frame (4) and the movable meter frame (6) are both configured as cylindrical rods, and the rotating meter frame (5) is configured as a rectangular parallelepiped structure.

5. The diesel engine high pressure oil pump output shaft coaxiality measuring device according to claim 1, characterized in that: The rotary locking clip (8) is fixed to the end of the movable table frame by a fastener.

6. The diesel engine high pressure oil pump output shaft coaxiality measuring device according to claim 1, characterized in that: The bearing (3) is a deep groove ball bearing.

7. The device for measuring the coaxiality of the output shaft of a diesel engine high-pressure oil pump according to claim 1, characterized in that: The middle portion of the side wall of the outer shaft sleeve (1) is concave.

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