Cylinder body measuring mechanism of engine

Abstract

The utility model relates to a cylinder body measuring mechanism of an engine, and belongs to the field of unmanned aerial vehicle aviation rotor engines. Comprising a measuring base, a mobile platform and a locking assembly, the measuring base body is of an annular structure, an annular guide rail is arranged on the annular upper end face of the measuring base body, and the outline of the guide rail is obtained by amplifying the molded line of a cylinder to be measured in an equal proportion. The platform can be attached to and installed on a cylinder body to be measured and serves as a carrying platform of the measuring mechanism. The mobile platform is slidably installed on the guide rail through a slide block assembly, and the slide block assembly is provided with a first measuring scale for measuring the circumferential position of the cylinder body to be measured. The moving platform is provided with a measuring scale for measuring the axial position and the radial position of the cylinder body to be measured and a digital display dial indicator for multi-dimensional dynamic calibration; and the locking assembly is used as a positioning part of the measuring base. According to the utility model, detection of engine molded lines, air inlet and outlet positions and initial installation positions of radial sealing strips can be realized, and stability of engine precision control and assembly quality can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of unmanned aerial vehicle (UAV) rotor engines, specifically relating to a cylinder block measuring mechanism for an engine. Background Technology

[0002] High-speed unmanned aerial vehicles (UAVs) often use rotary engines as their direct power source, and the reliable operation of these engines directly impacts flight safety. For rotary engines, the cylinder block profile is a crucial parameter for ensuring combustion chamber sealing and normal engine operation. However, the machining and assembly of actual cylinder block parts cannot achieve absolute zero error. This resulting cylinder block deformation alters the actual cylinder block profile, causing the radial sealing strip to move along the cylinder block profile normal within the rotor sealing groove, affecting normal engine operation and potentially leading to engine failure.

[0003] According to the working principle of the rotary engine, the intake and exhaust of the engine are controlled by the rotation of the rotor through the intake and exhaust ports. Therefore, if the position error of the intake and exhaust ports is large, it may cause the intake and exhaust phase to change, resulting in the combustion gas being discharged in advance, which will affect the actual power of the engine.

[0004] The apex of a rotary engine rotor is theoretically perfectly symmetrical. Therefore, after it is installed in the cylinder block, the initial position of the radial sealing strip between the rotor and the cylinder block is also fixed. However, due to manufacturing errors of the rotor, the distance between the rotor apex may not match the design, causing the radial sealing strip position to shift and affecting the normal operation of the engine.

[0005] When an engine has a problem with insufficient power output, the engine block profile and the position of the engine intake and exhaust ports are the key dimensions to check.

[0006] Cylinder block profiles and engine intake and exhaust phases can be measured using a coordinate measuring machine, but this measurement method has the following drawbacks:

[0007] 1. Inconvenient operation: For engines that have already been assembled, the cylinder block needs to be removed from the engine and taken to a coordinate measuring machine for measurement. It is impossible to measure directly on the components, making it impossible to achieve quality control during the assembly process.

[0008] 2. Measurement costs are high and the measurement cycle is long. Summary of the Invention

[0009] The technical problem to be solved:

[0010] To overcome the shortcomings of existing technologies, this invention provides a cylinder block measuring mechanism for engines, transforming complex contour measurement into a modular, portable solution, breaking through the dependence of traditional measurement technologies on high-cost equipment and specialized environments. Through integrated design (such as track matching, self-locking positioning, and digital display automation), it achieves a leap from "laboratory-level" to "field-level" measurement. It can detect engine profile lines, intake and exhaust port positions, and the initial installation position of radial sealing strips, facilitating improved engine precision control and assembly quality stability.

[0011] The technical solution of this utility model is: a cylinder block measuring mechanism for an engine, including a measuring base and a moving platform and a locking assembly mounted thereon;

[0012] The measuring base body is a ring structure, and a ring guide rail is provided on its upper ring surface. The outline of the guide rail is obtained by proportionally enlarging the profile of the cylinder body to be measured. It can be fitted and installed on the cylinder body to be measured, serving as a mounting platform for the measuring mechanism.

[0013] The mobile platform is slidably mounted on the guide rail via a slider assembly. The slider assembly is equipped with a first measuring scale for measuring the circumferential position of the cylinder to be tested. The mobile platform is equipped with measuring scales for measuring the axial and radial positions of the cylinder to be tested, as well as a digital dial indicator for multi-dimensional dynamic calibration.

[0014] The locking assembly serves as a positioning component for the measuring base.

[0015] A further technical solution of this utility model is: handrails are provided on opposite sides of the measuring base body to facilitate loading, unloading and installation.

[0016] A further technical solution of this utility model is: the inner ring surface of the measuring base is provided with multiple mounting seats for installing self-locking positioning pin components to complete the fitting installation and locking of the measuring base and the cylinder body to be tested; the mounting seats are provided with through holes coaxial with the positioning holes on the top surface of the cylinder body to be tested.

[0017] A further technical solution of this utility model is: the self-locking pin assembly includes a pin seat and a pin coaxially mounted thereon. The pin seat is a sleeve structure, with its bottom mounted on a mounting base. Four slots are evenly distributed circumferentially on its top ring surface. Two of these slots are opposite each other and have a semi-circular cross-section as the first slot, and the other two are opposite each other and have a rectangular and semi-circular cross-section as the second slot. That is, the axial depth of the second slot is greater than that of the first slot. A knob is mounted on the top of the pin, and two buckles are symmetrically arranged on its outer circumference.

[0018] When the two clips are placed in the first slot, the axial position of the bottom of the pin rises and disengages from the positioning hole of the cylinder to be tested. By turning the knob, the position of the two clips is adjusted to be opposite to the second slot, and the clips are pressed to the bottom of the second slot. The axial position of the bottom of the pin drops and is inserted into the positioning hole of the cylinder to be tested, thereby locking the measuring base and the cylinder to be tested.

[0019] A further technical solution of this utility model is: the vertical height of the mobile platform is adjustable, and the radial position of the digital micrometer mounted on the mobile platform is adjustable. By adjusting the circumferential position of the slider assembly, the height position of the mobile platform, and the radial position of the digital micrometer, the probe position of the digital micrometer can be further adjusted for calibration and measurement.

[0020] A further technical solution of this utility model is: the mobile platform is a cuboid structure, a second measuring ruler for measuring the axial position of the cylinder to be measured is installed on its side wall, a boss is provided on its inner side wall, and a third measuring ruler for measuring the radial position of the cylinder to be measured is installed on the top surface of the boss.

[0021] The mobile platform has a threaded through hole and a blind hole that are parallel to each other in the vertical direction. The threaded through hole is used to install a screw rod, and a first knob is provided at the top of the screw rod. A guide rod is inserted into the blind hole. The bottom end of the screw rod passes through the mobile platform and is rotatably connected to the slider assembly. The bottom of the guide rod is fixed to the slider assembly, and the top of the guide rod is in clearance fit with the blind hole. The height of the mobile platform can be adjusted by turning the first knob.

[0022] The mobile platform has a through hole that combines a threaded hole and a square aperture along the horizontal direction. One end of a telescopic rod with a square cross-section is inserted into the square aperture, and a digital dial indicator is installed at the other end. A screw with a second knob is screwed into the threaded hole, and its end is rotatably connected to one end of the telescopic rod. The radial position of the digital dial indicator can be adjusted by turning the second knob.

[0023] A further technical solution of this utility model is: the slider assembly includes a slider base and four rollers installed on its bottom. Each pair of rollers perpendicular to the direction of movement forms a group, which is clamped on both sides of the guide rail and can rotate along the annular guide rail to ensure smooth operation.

[0024] A further technical solution of this utility model is: the digital display dial indicator is a lever-type dial indicator, and its probe head is spherical or conical.

[0025] A further technical solution of this utility model is: the measuring ruler is a digital vernier caliper.

[0026] Beneficial effects

[0027] The beneficial effects of this utility model are as follows: Through integrated design (track matching, self-locking positioning, digital display) and modular structure, this utility model transforms traditional laboratory-level measurement into a highly efficient field-level solution, combining high precision, low cost, portability, and multifunctionality. It is particularly suitable for the rapid inspection and routine maintenance of UAV rotor engines, significantly improving assembly quality stability. Specific effects are analyzed below:

[0028] 1. In-situ measurement and ease of operation. This invention, through a proportionally enlarged track and a self-locking pin assembly, allows for direct measurement on the assembled cylinder body, avoiding the cumbersome process of disassembling the cylinder body required by traditional coordinate measuring machines, significantly improving operational efficiency. The dual-knob adjustment design of the moving platform (height and probe extension) combined with the real-time display function of the digital dial indicator allows a single person to complete calibration, measurement, and data recording, reducing reliance on professional personnel.

[0029] 2. High precision and multi-functional integration. The track of the measuring base of this utility model is strictly enlarged proportionally according to the cylinder block profile, ensuring that the movement trajectory of the slider assembly along the track is consistent with the actual contour of the cylinder block, and the contour error can be controlled within the micrometer level. A single device can simultaneously measure the cylinder block profile, intake and exhaust phases, and the initial position of the radial sealing strip, covering the key quality inspection needs of the engine and reducing equipment changeover time.

[0030] 3. Cost-effectiveness and portability. Compared to coordinate measuring machines (CMMs), this device has a simpler structure and lower manufacturing cost, making it suitable for use in small to medium-sized repair shops or battlefield environments. The measuring base is equipped with a handrail, and the entire device is compact and portable, supporting rapid deployment in the field or hangar, adapting to diverse maintenance scenarios for UAV engines.

[0031] 4. Anti-interference and stability. This invention uses a knob to drive a pin to insert into a positioning hole and engage mechanically, effectively preventing mechanism misalignment caused by vibration or external force during measurement and ensuring data acquisition stability. The slider assembly employs a roller structure at its bottom, combined with the elastic adjustment function of the moving platform, enabling smooth sliding in sharp corners or complex contour areas, avoiding data jump errors. Attached Figure Description

[0032] Figure 1 This is a structural diagram of a cylinder block measuring mechanism for an engine according to the present invention;

[0033] Figure 2 This is a schematic diagram of the calibration of a cylinder block measuring mechanism for an engine according to the present invention;

[0034] Figure 3 This is a schematic diagram of a cylinder block measuring mechanism for measuring cylinder block profile and intake / exhaust phase of an engine according to this utility model;

[0035] Figure 4This is a schematic diagram of a cylinder block measuring mechanism for an engine according to the present invention, used for measuring special points.

[0036] Figure 5 This is a schematic diagram of the self-locking pin assembly of the measuring mechanism of this utility model; (a) the self-locking pin assembly in the locked state, (b) the self-locking pin assembly in the unlocked state;

[0037] Explanation of reference numerals in the attached drawings: 1—Measuring base, 11—Guide rail, 12—Self-locking pin assembly mounting base, 2—Slider assembly, 3—First measuring scale, 4—Second measuring scale, 5—Moving platform, 51—First knob, 52—Second knob, 6—Third measuring scale, 7—Digital dial indicator, 71—Probe, 8—First self-locking pin assembly, 9—Second self-locking pin assembly, 91—Pin seat, 911—Slot, 92—Pin, 93—Knob, 94—Snap fastener. Detailed Implementation

[0038] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Addressing the problems encountered when using a coordinate measuring machine to measure the cylinder block profile and engine intake and exhaust phases using traditional methods, this invention provides a cylinder block measuring mechanism for an engine, comprising a measuring base, a movable platform mounted thereon, and a locking assembly. The measuring base body is an annular structure with an annular guide rail on its upper annular surface. The contour of the guide rail is proportionally enlarged from the cylinder block profile to be measured. It can be fitted snugly onto the cylinder block to be measured, serving as a mounting platform for the measuring mechanism. The movable platform is slidably mounted on the guide rail via a slider assembly, on which a first measuring scale for measuring the circumferential position of the cylinder block to be measured is mounted. The movable platform is equipped with measuring scales for measuring the axial and radial positions of the cylinder block to be measured, as well as a digital dial indicator for multi-dimensional dynamic calibration. The locking assembly serves as a positioning component for the measuring base.

[0041] The above technical solution will be further explained below with reference to the accompanying drawings:

[0042] In one embodiment, refer to Figure 1 As shown, this example of a cylinder block measuring mechanism for an aircraft rotary engine includes a measuring base 1, a slider assembly 2, a first measuring scale 3, a second measuring scale 4, a moving platform 5, a third measuring scale 6, a digital dial indicator 7, and two self-locking pin assemblies 8 and 9.

[0043] In one embodiment, the measuring base 1 has handrails on opposite sides of its body for easy placement and installation.

[0044] Specifically, the inner ring surface of the measuring base is provided with multiple mounting seats for installing self-locking positioning pin assemblies to complete the fitting and locking installation of the measuring base and the cylinder body to be tested; the mounting seats have through holes coaxial with the positioning holes on the top surface of the cylinder body to be tested.

[0045] In one embodiment, refer to Figure 5 As shown, the self-locking pin assembly 8 and 9 includes a pin seat and a pin 92 coaxially mounted thereon. The pin seat 91 is a sleeve structure, with its bottom mounted on a mounting base. Four slots 911 are evenly distributed circumferentially on its top annular surface. Two of these slots are opposite each other and have a semi-circular cross-section, serving as the first slot. The other two are opposite each other and have a rectangular and semi-circular cross-section, serving as the second slot. The axial depth of the second slot is greater than that of the first slot. A knob 93 is mounted on the top of the pin, and two buckles 94 (cylindrical buckles) are symmetrically arranged on its outer circumference. When the two buckles 94 are placed in the first slot, the axial position of the bottom of the pin 92 rises, disengaging from the positioning hole of the cylinder to be tested. By turning the knob 93, the position of the two buckles 94 is adjusted to be opposite to the second slot, and the buckles 94 are pressed to the bottom of the second slot. The axial position of the bottom of the pin 92 drops, inserting into the positioning hole of the cylinder to be tested, thereby locking the measuring base 1 and the cylinder to be tested to ensure the validity of the measurement dimensions.

[0046] In one embodiment, the vertical height of the moving platform 5 is adjustable, and the radial position of the digital micrometer 7 mounted on the moving platform 5 is adjustable. By adjusting the circumferential position of the slider assembly 2, the height position of the moving platform, and the radial position of the digital micrometer 7, the position of the probe 71 of the digital micrometer 7 can be further adjusted for calibration and measurement.

[0047] Specifically, the mobile platform 5 is the mounting platform for the measuring ruler and digital micrometer 7. It has a cuboid structure. A second measuring ruler 4 for measuring the axial position of the cylinder to be measured is installed on its side wall. A boss is provided on its inner side wall. A third measuring ruler 6 for measuring the radial position of the cylinder to be measured is installed on the top surface of the boss.

[0048] The mobile platform 5 has a threaded through hole and a blind hole that are parallel to each other in the vertical direction. The threaded through hole is used to install a screw rod. A first knob 51 is provided at the top of the screw rod. A guide rod is inserted into the blind hole. The bottom end of the screw rod passes through the mobile platform and is rotatably connected to the slider assembly. The bottom of the guide rod is fixed to the slider assembly, and the top of the guide rod is in clearance fit with the blind hole. The height of the mobile platform can be adjusted by turning the first knob.

[0049] The mobile platform 5 has a through hole that combines a threaded hole and a square aperture along the horizontal direction. One end of a telescopic rod with a square cross-section is inserted into the square aperture, and the other end is equipped with a digital micrometer 7. A screw with a second knob 52 is screwed into the threaded hole, and its end is rotatably connected to one end of the telescopic rod. By turning the second knob 52, the radial position of the digital micrometer 7 can be adjusted, which is convenient for measuring the profiles at different positions and depths of the cylinder.

[0050] Preferably, the digital micrometer 7 is a lever-type micrometer, which uses digital display technology to read the linear displacement sensed by the probe 71. It can perform absolute measurement, relative measurement, tolerance zone limit value detection, etc., and can preset any position as the starting position. It can also display the maximum value, minimum value, and maximum-minimum value difference during runout testing. The reading can be taken directly from the dial or the measurement data can be transmitted to a computer to realize automatic data acquisition. The probe 71 head is spherical or conical, supporting preset starting position, tolerance zone limit detection, and automatic data transmission to the computer.

[0051] In one embodiment, the slider assembly 2 includes a slide block and four rollers mounted on its bottom. Each pair of rollers perpendicular to the direction of movement forms a group, clamped on both sides of a guide rail, allowing rotation along the annular guide rail to ensure smooth operation. The slider assembly 2 ensures the measuring mechanism can move smoothly along the track, facilitating measurement of any position on the cylinder block profile. Calibration lines are designed on the slider for easy slider position calibration.

[0052] Preferably, the three measuring scales have a calibration function, which can measure the relative displacement in the required direction. The readings can be taken directly from the measuring scale dials, or the measurement data can be transmitted to a computer to achieve automatic data acquisition.

[0053] Preferably, the measuring ruler is a digital vernier caliper.

[0054] This utility model discloses a method for measuring the cylinder block profile using a cylinder block measuring mechanism for an engine. The specific steps are as follows:

[0055] Step 1: Place the cylinder to be tested on a flat surface, and place the measuring mechanism 1 on the cylinder to be tested (see...). Figure 3 Rotate the top knob of the self-locking pin assembly 8 and 9 to insert the pin 92 into the cylinder positioning hole;

[0056] Step 2: Push the slider assembly 2 to align the calibration line on the slider assembly 2 with the calibration line on the measuring base (see...). Figure 2 ), calibrate the first measuring scale 3;

[0057] Step 3: Rotate and adjust the first and second knobs on the moving platform 5 (see...) Figure 3 Make the digital micrometer probe 71 contact the top surface of the cylinder to be tested, and calibrate the second measuring scale 4;

[0058] Step 4: Rotate and adjust the first knob 51 and the second knob 52 on the moving platform 5 (see...) Figure 3 This allows the digital micrometer probe 71 to reach the planned cylinder height, while simultaneously the probe 71 contacts the inner wall of the cylinder, calibrating the third measuring scale 6 and the digital micrometer 7.

[0059] Step 5: Push the slider assembly 2 until it reaches a new measurement point, then measure the data at the new position using the digital micrometer 7.

[0060] This utility model discloses a method for measuring the intake and exhaust phases using a cylinder block measuring mechanism for an engine. The specific steps are as follows:

[0061] Step 1: Place the cylinder to be tested on a flat surface, and place the measuring mechanism 1 on the cylinder to be tested (see...). Figure 3 Rotate the top knob of the self-locking pin assembly 8 and 9 to make the buckle 94 on the pin 92 lock in the slot 911, and press the knob 93 to insert the pin 92 into the cylinder positioning hole.

[0062] Step 2: Push the slider assembly 2 to align the calibration line on the slider assembly 2 with the calibration line on the measuring base (see...). Figure 2 ), calibrate the first measuring scale 3;

[0063] Step 3: Rotate and adjust the first knob 51 and the second knob 52 on the moving platform 5 (see...) Figure 3 Make the digital micrometer probe 71 contact the top surface of the cylinder to be tested, and calibrate the second measuring scale 4;

[0064] Step 4: Rotate and adjust the first knob 51 and the second knob 52 on the moving platform 5 (see...) Figure 3 This allows the digital micrometer probe 71 to reach the planned cylinder height, while simultaneously the probe 71 contacts the inner wall of the cylinder, calibrating the third measuring scale 6 and the digital micrometer 7.

[0065] Step 5: When the slider assembly 2 is pushed to the vicinity of the intake or exhaust port, rotate the adjustment knob 2 to make the probe contact the inside of the cylinder. After the coarse adjustment is completed, continue to fine-tune. Slowly push the slider assembly 2. When it reaches the critical position of the intake or exhaust port, the value of the digital micrometer 7 will change significantly. Obtain the intake and exhaust phase through the data of the first measuring scale 3 at the data jump point.

[0066] This utility model discloses a method for measuring the position of special points using a cylinder block measuring mechanism for an engine. The specific steps are as follows:

[0067] Step 1: Place the cylinder block assembly to be tested on a flat surface, rotate the rotor to its initial position, and place the measuring mechanism on the assembly to be tested (see...). Figure 4 Rotate the top knob of the self-locking pin assembly 8 and 9 to make the buckle 94 on the pin 92 lock in the slot 911, and press the knob 93 to insert the pin 92 into the cylinder positioning hole.

[0068] Step 2: Push the slider assembly 2 to align the calibration line on the slider assembly 2 with the calibration line on the measuring base (see...). Figure 2 ), calibrate the first measuring scale 3;

[0069] Step 3: Rotate and adjust the first knob 51 and the second knob 52 on the moving platform 5 so that the height of the probe 71 is between the top of the cylinder and the top of the radial sealing strip;

[0070] Step 4: Push the slider assembly 2 to the vicinity of the radial sealing strip (see...) Figure 4 Slowly push the slider assembly while rotating and adjusting the first knob 51 and the second knob 52 on the moving platform 5. When the probe 71 contacts the radial sealing strip, the value of the digital micrometer 7 jumps. Record the value of the first measuring ruler 3 at this point to obtain the actual position of the radial sealing strip.

[0071] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A cylinder block measuring mechanism for an engine, characterized in that: Includes a measuring base and a mobile platform mounted thereon, and locking components; The measuring base body is a ring structure, and a ring guide rail is provided on its upper ring surface. The outline of the guide rail is obtained by proportionally enlarging the profile of the cylinder body to be measured. It can be fitted and installed on the cylinder body to be measured, serving as a mounting platform for the measuring mechanism. The mobile platform is slidably mounted on the guide rail via a slider assembly. The slider assembly is equipped with a first measuring scale for measuring the circumferential position of the cylinder to be tested. The mobile platform is equipped with measuring scales for measuring the axial and radial positions of the cylinder to be tested, as well as a digital dial indicator for multi-dimensional dynamic calibration. The locking assembly serves as a positioning component for the measuring base.

2. The cylinder block measuring mechanism for an engine according to claim 1, characterized in that: Handrails are provided on opposite sides of the measuring base body to facilitate loading, unloading, and installation.

3. The cylinder block measuring mechanism for an engine according to claim 1, characterized in that: The inner ring surface of the measuring base is provided with multiple mounting seats for installing self-locking positioning pin assemblies to complete the fitting and locking installation of the measuring base and the cylinder body to be tested; the mounting seats have through holes coaxial with the positioning holes on the top surface of the cylinder body to be tested.

4. The cylinder block measuring mechanism for an engine according to claim 3, characterized in that: The self-locking pin assembly includes a pin seat and a pin coaxially mounted thereon. The pin seat is a sleeve structure with its bottom mounted on a mounting base. Four slots are evenly distributed circumferentially on its top annular surface. Two of these slots are opposite each other and have a semi-circular cross-section, serving as the first slot. The other two are opposite each other and have a rectangular and semi-circular cross-section, serving as the second slot. That is, the axial depth of the second slot is greater than that of the first slot. A knob is mounted on the top of the pin, and two buckles are symmetrically arranged on its outer circumference. When the two clips are placed in the first slot, the axial position of the bottom of the pin rises and disengages from the positioning hole of the cylinder to be tested. By turning the knob, the position of the two clips is adjusted to be opposite to the second slot, and the clips are pressed to the bottom of the second slot. The axial position of the bottom of the pin drops and is inserted into the positioning hole of the cylinder to be tested, thereby locking the measuring base and the cylinder to be tested.

5. The cylinder block measuring mechanism for an engine according to claim 4, characterized in that: The vertical height of the mobile platform is adjustable, and the radial position of the digital micrometer mounted on the mobile platform is adjustable. By adjusting the circumferential position of the slider assembly, the height position of the mobile platform, and the radial position of the digital micrometer, the probe position of the digital micrometer can be further adjusted for calibration and measurement.

6. The cylinder block measuring mechanism for an engine according to claim 5, characterized in that: The mobile platform has a cuboid structure. A second measuring scale for measuring the axial position of the cylinder to be tested is installed on its side wall. A boss is provided on its inner side wall. A third measuring scale for measuring the radial position of the cylinder to be tested is installed on the top surface of the boss. The mobile platform has a threaded through hole and a blind hole that are parallel to each other in the vertical direction. The threaded through hole is used to install a screw rod, and a first knob is provided at the top of the screw rod. A guide rod is inserted into the blind hole. The bottom end of the screw rod passes through the mobile platform and is rotatably connected to the slider assembly. The bottom of the guide rod is fixed to the slider assembly, and the top of the guide rod is in clearance fit with the blind hole. The height of the mobile platform can be adjusted by turning the first knob. The mobile platform has a through hole that combines a threaded hole and a square aperture along the horizontal direction. One end of a telescopic rod with a square cross-section is inserted into the square aperture, and a digital dial indicator is installed at the other end. A screw with a second knob is screwed into the threaded hole, and its end is rotatably connected to one end of the telescopic rod. The radial position of the digital dial indicator can be adjusted by turning the second knob.

7. The cylinder block measuring mechanism for an engine according to claim 6, characterized in that: The slider assembly includes a slide block and four rollers mounted on its bottom. Each pair of rollers perpendicular to the direction of movement forms a group, which is clamped on both sides of the guide rail and can rotate along the annular guide rail to ensure smooth operation.

8. The cylinder block measuring mechanism for an engine according to claim 1, characterized in that: The digital dial indicator is a lever-type dial indicator, and its probe head is spherical or conical.

9. The cylinder block measuring mechanism for an engine according to claim 1, characterized in that: The measuring ruler is a digital vernier caliper.

Images