Gauge for measuring center hole, end face and thrust surface of crankshaft

Abstract

The invention belongs to the technical field of automobile power assemblies, and particularly relates to a testing fixture for measuring a central hole, an end face and a thrust surface of a crankshaft, which comprises a left tip measuring mechanism, a right tip measuring mechanism, a thrust surface measuring mechanism, an angle fixing mechanism and a crankshaft bracket mechanism. Compared with the prior art, the problem that a gauge in the prior art can only measure a single size parameter is solved. According to the scheme, through the reasonable structural design of the left center mechanism and the right center mechanism, the thrust surface mechanism is arranged, and the thrust surface mechanism and the left center mechanism are arranged in a transmission mode, one-time measurement of the center hole, the end face and the thrust surface of the crankshaft is achieved, the production takt time can be increased, and the production cost can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive powertrains, and particularly relates to a measuring fixture for measuring the center hole, end face, and thrust face of a crankshaft. Background Art

[0002] The crankshaft, as one of the core moving parts of an internal combustion engine, its machining accuracy directly affects the running smoothness and service life of the engine; as a key feature for axial positioning of the crankshaft, the thrust face is located in the middle of the crankshaft and on both sides of the main journal, and realizes the spatial positioning of the crankshaft by contacting the engine block. In the crankshaft manufacturing process, the first process is the milling of both end faces and the machining of the center hole with the thrust face as the reference (drilling the center hole after milling both end faces with the thrust face). The processing quality of this process not only determines the reference accuracy of subsequent processes, but also affects the overall geometric tolerance and dynamic balance performance of the crankshaft. According to statistics, when the axial dimension error of the crankshaft exceeds 0.03 mm, the engine power will drop by 2-3%, so the quality control of the first process is particularly critical.

[0003] Currently, crankshaft production enterprises generally use a coordinate measuring machine (CMM) for dimensional inspection. This technology can theoretically achieve a measuring accuracy of 0.005 mm through contact measurement in a three-dimensional coordinate system. However, in actual production, there are significant bottlenecks in CMM measurement: single-piece inspection takes 15-20 minutes, and the overall inspection cycle is long and the efficiency is low. In addition, some enterprises try to use manual calipers for measurement, but there are problems such as uneven measuring force and poor fitting of the reference surface, and the measurement repeatability error often reaches ±0.05 mm.

[0004] With the increasing urgent demand for high-efficiency inspection equipment in the automotive parts industry, especially in the inspection of the first process of the crankshaft, it is necessary to develop special measuring fixtures to achieve rapid inspection of key parameters of the crankshaft.

[0005] For example, CN102183209A discloses a measuring fixture for detecting the axial dimension of a crankshaft and its detection method, CN103376041A discloses a measuring fixture for detecting the position degree of a process hole of a crankshaft and its detection method, CN105865298A discloses a circular runout detection device and detection method for the thrust face of a crankshaft, etc. Existing publicly disclosed patent solutions have disclosed measuring fixtures for testing different key parameters of the crankshaft. However, due to the relatively complex structure of the measuring fixture itself (usually including left and right center-point mechanisms to position the crankshaft, and then additional detection mechanisms to achieve the measurement of specific parameters of the crankshaft), the current solutions can only complete the measurement of a single parameter, which in turn leads to the need to spend more labor costs, time costs, and production costs in the production process to complete the measurement of different parameters of the crankshaft through multiple types of measuring fixtures, which is not conducive to improving the production beat and reducing costs.

[0006] In view of this, it is necessary to propose a fixture that can simultaneously measure multiple key parameters of the crankshaft to improve the production rhythm and reduce the production cost. Summary of the Invention

[0007] The purpose of the present invention is to provide a fixture for measuring the center hole, end face and thrust face of the crankshaft to solve at least one of the above problems, so as to solve the problem that the existing fixtures can only measure single size parameters. Through the reasonable structural design of the left center point mechanism and the right center point mechanism, and setting the thrust face mechanism and drivingly connecting the thrust face mechanism with the left center point mechanism, the present solution realizes the one-time measurement of the center hole, end face and thrust face of the crankshaft, which can improve the production rhythm and reduce the production cost.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A fixture for measuring the center hole, end face and thrust face of the crankshaft includes a left center point measuring mechanism, a right center point measuring mechanism and a thrust face measuring mechanism;

[0010] The left center point measuring mechanism includes a left center point support, a left center point unit, a left center point measuring sleeve, a left center point measuring lever and a first dial indicator; the left center point unit is slidably arranged on the left center point support, the left center point measuring sleeve is sleeved outside the left center point unit, the left center point measuring lever is rotatably connected to the left center point support and one end of the left center point measuring lever is arranged on the movement path of the left center point measuring sleeve, and the first dial indicator abuts against the other end of the left center point measuring lever;

[0011] The right center point measuring mechanism includes a right center point support, a right center point unit, a right center point measuring plate, a second dial indicator, a right center point lever and a third dial indicator; the right center point unit is slidably arranged on the right center point support, the right center point measuring plate is assembled on the right center point unit, the second dial indicator abuts against the right center point measuring plate; the right center point lever is rotatably connected to the right center point support and one end of the right center point lever is arranged on the movement path of the right center point unit, and the third dial indicator abuts against the other end of the right center point lever;

[0012] The left center point unit and the right center point unit are arranged facing each other, and the center line of the left center point unit coincides with the center line of the right center point unit for jointly positioning the crankshaft;

[0013] The thrust face measuring mechanism includes a slider guide seat, a follow-up unit, a fourth dial indicator and a transmission rod; the transmission rod is connected between the left center point unit and the follow-up unit, the middle of the follow-up unit is rotatably connected to the slider guide seat and both ends of the follow-up unit are slidably connected to the slider guide seat, the follow-up unit faces the crankshaft, and the fourth dial indicator abuts against the follow-up unit.

[0014] Preferably, the left center unit includes a left center handle, a left center handle rotating lever, a left center connecting rod, a left center sleeve, and a left center;

[0015] The left center sleeve is slidably disposed on the left center support;

[0016] The first end of the left center sleeve is sleeved outside the tail end of the left center, the second end of the left center sleeve is rotatably connected to the first end of the left center connecting rod, the left center handle rotating lever is rotatably connected to the second end of the left center connecting rod, and the left center handle is assembled on the left center handle rotating lever;

[0017] The left center measuring sleeve is sleeved outside the tip end of the left center, and the left center measuring sleeve abuts against the first end of the left center sleeve;

[0018] One end of the transmission rod is connected to the left center sleeve.

[0019] Preferably, a plurality of blind holes are circumferentially formed at the second end of the left center measuring sleeve, a left center measuring sleeve spring is disposed in the blind hole, and the left center measuring sleeve spring abuts between the left center measuring sleeve and the left center sleeve;

[0020] A left center measuring sleeve ball head is assembled at the first end of the left center measuring sleeve, and the left center measuring lever is disposed on the movement path of the left center measuring sleeve ball head.

[0021] Preferably, the right center unit includes a right center handle, a right center handle rotating lever, a right center connecting rod, a right center sleeve, and a right center;

[0022] The right center sleeve is slidably disposed on the right center support;

[0023] The first end of the right center sleeve is sleeved outside the tail end of the right center, the second end of the right center sleeve is rotatably connected to the first end of the right center connecting rod, the right center handle rotating lever is rotatably connected to the second end of the right center connecting rod, and the right center handle is assembled on the right center handle rotating lever;

[0024] The right center measuring plate is assembled at the second end of the right center sleeve;

[0025] The right center lever is disposed on the movement path of the right center sleeve.

[0026] Preferably, the follow-up unit includes a thrust surface lever, a slider, a slider guide rail, a thrust surface measuring rod, and a slider spring;

[0027] The middle part of the thrust surface lever is rotatably connected to the slider guide rail seat, and both ends of the thrust surface lever are respectively connected to the slider;

[0028] The described slider guide rail is assembled on the slider guide rail seat and the slider guide rail is arranged parallel to the center line of the left center point unit; the slider is slidably connected to the slider guide rail;

[0029] The slider spring is connected between the slider and the slider guide rail seat;

[0030] The thrust surface measuring rod is assembled on the slider and the thrust surface measuring rod faces the crank;

[0031] One end of the transmission rod abuts against the end of the thrust surface lever;

[0032] The fourth dial indicator abuts against the end of the thrust surface lever.

[0033] Preferably, the tracking unit further includes a limit screw, the limit screw is threadedly connected to the slider guide rail seat and the limit screw is arranged on the movement path of the slider; the slider spring is sleeved on the limit screw;

[0034] The thrust surface measuring rod is of a T-shaped structure, and a measuring ball head is arranged at one end of the thrust surface measuring rod extending towards the crankshaft.

[0035] Preferably, the inspection tool further includes a fixed angle mechanism;

[0036] The fixed angle mechanism includes a fixed angle bracket, an expansion shaft, a fixed angle claw seat, fixed angle claws, a fixed angle claw spring and a handle driving unit;

[0037] The expansion shaft is movably connected to the fixed angle bracket, one end of the expansion shaft is connected to the handle driving unit, and the other end of the expansion shaft abuts against the fixed angle claws;

[0038] The fixed angle claw seat is assembled on the fixed angle bracket, and the fixed angle claws are rotatably connected to the fixed angle claw seat;

[0039] One end of the fixed angle claw spring is assembled on the fixed angle claw seat, and the other end of the fixed angle claw spring is connected to the fixed angle claws;

[0040] The end surface of the fixed angle claw abutting against the expansion shaft is an arc surface.

[0041] Preferably, the handle driving unit includes a fixed angle handle, a fixed angle handle shaft, an eccentric shaft and a dial;

[0042] The dial is assembled at one end of the expansion shaft, the fixed angle handle shaft is connected to the dial through the eccentric shaft, and the fixed angle handle is assembled on the fixed angle handle shaft.

[0043] Preferably, the inspection tool further includes a crankshaft bracket mechanism;

[0044] The described crankshaft bracket mechanism includes a crankshaft bracket, a crankshaft tray, a crankshaft bracket slider, a crankshaft bracket guide rail, and a crankshaft bracket guide rail base;

[0045] The described crankshaft bracket guide rail is arranged on the crankshaft bracket guide rail base;

[0046] The described crankshaft bracket slider is slidably assembled on the crankshaft bracket guide rail;

[0047] The described crankshaft tray is connected to the crankshaft bracket slider;

[0048] The described crankshaft bracket is connected to the crankshaft tray, and the crankshaft bracket is used to support the crankshaft.

[0049] Preferably, the described crankshaft bracket guide rail is arranged perpendicular to the center line of the left center point unit; when the crankshaft is arranged on the crankshaft bracket, the center line of the crankshaft is parallel to the center line of the left center point unit.

[0050] The working principle of the present invention is as follows:

[0051] Place the crankshaft between the left center point measuring mechanism and the right center point measuring mechanism, and position the crankshaft by inserting the left center point unit and the right center point unit into the center hole of the crankshaft and abutting against the end face. At the same time, the transmission rod pushes the follower unit to make it fit and abut against the thrust surface. In this solution, the size of the crankshaft is measured by the comparison measurement method. Specifically, first, measure the standard crankshaft with this measuring tool and record the data of each dial indicator (standard size data), and then measure the crankshaft to be measured and record the data of each dial indicator (measured size data). By comparing the difference between the standard size data and the measured size data, the size deviation and size data of the crankshaft to be measured can be obtained.

[0052] During the positioning process, the left center point measuring lever is pushed and rotated by the left center point measuring sleeve, and further, the left center point measuring lever pushes the first dial indicator to measure the displacement distance (stop moving when the left center point unit abuts against the end face), so as to obtain the end face size on the corresponding side of the left center point unit; similarly, the third dial indicator measures the end face size on the corresponding side of the right center point unit through the right center point lever; the right center point measuring plate moves with the right center point unit, and the second dial indicator records the displacement distance of the right center point measuring plate (equivalent to the right center point unit), and obtains the size of the center hole based on this; the fourth dial indicator obtains the displacement distance before and after the rotation of the follower unit (abuts against the thrust surface after rotation) to obtain the size of the thrust surface.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] The present invention provides a measuring tool that can simultaneously measure the parameter sizes of the center hole, end face, and thrust surface of the crankshaft. When in use, the crankshaft can be positioned by the left and right center points according to the conventional operation, and multiple parameters can be obtained through the set dial indicators, which is very convenient to use and has high efficiency.

[0055] Two center points are provided for the checking fixture of the present invention. One of them can be used as a positioning structure, and the other can be used as a floating structure. Therefore, on the basis of ensuring reliable and accurate positioning, the checking fixture can also be suitable for measuring crankshafts of different sizes.

[0056] The checking fixture proposed by the present invention completes the measurement of dimensions after the physical structure of the crankshaft is positioned, and the measured displacement distance is not affected by operations, with high detection accuracy.

[0057] The checking fixture of the present invention has a clever structure and high integration. At the same time, the whole can be divided into multiple mechanisms for easy maintenance. Description of the Drawings

[0058] Figure 1 is a schematic structural diagram of the crankshaft;

[0059] Figure 2 is Figure 1 a partially enlarged schematic structural diagram of the central hole at the flange end of the crankshaft in

[0060] Figure 3 is Figure 1 a partially enlarged schematic structural diagram of the central hole at the shaft head end of the crankshaft in

[0061] Figure 4 is a front view sectional schematic structural diagram of the checking fixture;

[0062] Figure 5 is Figure 4 a sectional schematic structural diagram of the C-C section in

[0063] Figure 6 is Figure 4 a sectional schematic structural diagram of the D-D section in

[0064] Figure 7 is a partially enlarged top view sectional schematic structural diagram of the left center point measuring mechanism at the end of the center point;

[0065] Figure 8 is a partially enlarged top view sectional schematic structural diagram of the right center point measuring mechanism at the end of the center point;

[0066] Figure 9 is a partially enlarged top view sectional schematic structural diagram of the thrust surface measuring mechanism;

[0067] Figure 10 is an isometric structural schematic diagram of the internal structure of the checking fixture, a, front isometric view, b, back isometric view;

[0068] Figure 11 is an isometric structural schematic diagram of the checking fixture, a, front isometric view, b, back isometric view;

[0069] In the figure:

[0070] 100 - Left top measuring mechanism; 101 - Left top bracket; 102 - Left top measuring sleeve; 103 - Left top measuring lever; 104 - First dial indicator; 105 - Left top handle; 106 - Left top handle rotating lever; 107 - Left top connecting rod; 108 - Left top sleeve; 109 - Left top; 110 - Left top measuring sleeve spring; 111 - Left top measuring sleeve ball head; 112 - Left top end plate connecting block; 113 - Left top end plate; 114 - Left top sleeve transmission plate; 115 - Left top sensor fixing seat;

[0071] 200 - Right top measuring mechanism; 201 - Right top bracket; 202 - Right top measuring plate; 203 - Second dial indicator; 204 - Right top lever; 205 - Third dial indicator; 206 - Right top handle; 207 - Right top handle rotating lever; 208 - Right top connecting rod; 209 - Right top sleeve; 210 - Right top; 211 - Right top end cover; 212 - Right top sensor mounting base; 213 - Right top lever ball head; 214 - Crankshaft end face sensor mounting base;

[0072] 300-thrust surface measuring mechanism; 301-slider guide rail seat; 302-fourth dial indicator; 303-transmission rod; 304-thrust surface lever; 305-slider; 306-slider guide rail; 307-thrust surface measuring rod; 308-slider spring; 309-limit screw; 310-measuring ball head;

[0073] 400 - fixed angle mechanism; 401 - fixed angle bracket; 402 - expansion shaft; 403 - fixed angle claw seat; 404 - fixed angle claw; 405 - fixed angle claw spring; 406 - fixed angle handle shaft; 407 - eccentric shaft; 408 - dial; 409 - fixed angle claw spring seat;

[0074] 500-crankshaft bracket mechanism; 501-crankshaft bracket; 502-crankshaft tray; 503-crankshaft bracket slider; 504-crankshaft bracket guide rail; 505-crankshaft bracket guide rail base;

[0075] 600-crankshaft; 601-flange end; 602-shaft head end; 603-main journal; 604-connecting rod journal; 605-thrust surface; 701-base; 702-copper sleeve; 703-limit block; 704-anti-rotation pin; 705-rotating shaft. DETAILED DESCRIPTION

[0076] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0077] The following unresolved matters may adopt existing technologies.

[0078] Example 1

[0079] A fixture for measuring the center hole, end face and thrust face 605 of a crankshaft 600, as shown in Figure 1-1 Figure 1, includes a left center point measuring mechanism 100, a right center point measuring mechanism 200 and a thrust face measuring mechanism 300;

[0080] The left center point measuring mechanism 100 includes a left center point support 101, a left center point unit, a left center point measuring sleeve 102, a left center point measuring lever 103 and a first dial indicator 104; the left center point unit is slidably arranged on the left center point support 101, the left center point measuring sleeve 102 is sleeved outside the left center point unit, the left center point measuring lever 103 is rotatably connected to the left center point support 101 and one end of the left center point measuring lever 103 is arranged on the movement path of the left center point measuring sleeve 102, and the first dial indicator 104 abuts against the other end of the left center point measuring lever 103;

[0081] The right center point measuring mechanism 200 includes a right center point support 201, a right center point unit, a right center point measuring plate 202, a second dial indicator 203, a right center point lever 204 and a third dial indicator 205; the right center point unit is slidably arranged on the right center point support 201, the right center point measuring plate 202 is assembled on the right center point unit, the second dial indicator 203 abuts against the right center point measuring plate 202; the right center point lever 204 is rotatably connected to the right center point support 201 and one end of the right center point lever 204 is arranged on the movement path of the right center point unit, and the third dial indicator 205 abuts against the other end of the right center point lever 204;

[0082] The left center point unit and the right center point unit are arranged facing each other, and the center line of the left center point unit coincides with the center line of the right center point unit, for jointly positioning the crankshaft 600;

[0083] The thrust face measuring mechanism 300 includes a slider guide seat 301, a following rotation unit, a fourth dial indicator 302 and a transmission rod 303; the transmission rod 303 is connected between the left center point unit and the following rotation unit, the middle part of the following rotation unit is rotatably connected to the slider guide seat 301 and both ends of the following rotation unit are slidably connected to the slider guide seat 301, the following rotation unit faces the crankshaft 600, and the fourth dial indicator 302 abuts against the following rotation unit.

[0084] More specifically, in this embodiment:

[0085] As shown in Figure 1-3As shown in the figure, it is a schematic structural diagram of a crankshaft 600, one end of which is a flange end 601 and the other end is a shaft head end 602; a central hole is formed at the center of the end faces of the flange end 601 and the shaft head end 602 (the two end faces of the crankshaft 600), the columnar structure coaxial with the central hole is the main journal 603, and the columnar structure not coaxial with the central hole is the connecting rod journal 604; the surfaces on both sides of the main journal 603 in the middle position are the thrust surfaces 605. The structural dimensions of the crankshaft 600 are designed and manufactured according to actual requirements and will not be described in detail here.

[0086] As Figure 4 shown in FIGS. 10 and 11, the inspection tool includes a base 701, and a left center point measuring mechanism 100, a right center point measuring mechanism 200, a thrust surface measuring mechanism 300, a fixed angle mechanism 400, and a crankshaft bracket mechanism 500, which are respectively arranged on the base 701. Taking Figure 4 FIG. 11 as an example for illustration, on the base 701 from left to right are: the left center point measuring mechanism 100, the thrust surface measuring mechanism 300 / crankshaft bracket mechanism 500, the fixed angle mechanism 400, and the right center point measuring mechanism 200; among them, the crankshaft bracket mechanism 500 and the thrust surface measuring mechanism 300 are arranged front and back, and the left center point measuring mechanism 100, the crankshaft bracket mechanism 500, and the right center point measuring mechanism 200 are on the same center line (when the crankshaft 600 is in the detection position, the left center point measuring mechanism 100 and the right center point measuring mechanism 200 can enter the central hole of the crankshaft 600), the thrust surface measuring mechanism 300 and the fixed angle mechanism 400 are arranged side by side, and the thrust surface measuring mechanism 300 corresponds to the position of the thrust surface 605 of the crankshaft 600 (when the crankshaft 600 is in the detection position, the thrust surface measuring mechanism 300 can abut against the thrust surface 605 of the crankshaft 600), and the fixed angle mechanism 400 corresponds to the position of the connecting rod journal 604 of the crankshaft 600 (when the crankshaft 600 is in the detection position, the fixed angle mechanism 400 can clamp the connecting rod journal 604 of the crankshaft 600).

[0087] The left center point measuring mechanism 100, as Figure 4-7 shown in FIGS. 10 and 11, specifically includes a left center point bracket 101, a left center point measuring sleeve 102, a left center point measuring lever 103, a first dial indicator 104, a left center point handle 105, a left center point handle rotating lever 106, a left center point connecting rod 107, a left center point sleeve 108, a left center point 109, a left center point measuring sleeve spring 110, a left center point measuring sleeve ball head 111, a left center point end plate connecting block 112, a left center point end plate 113, a left center point sleeve transmission plate 114, a left center point sensor fixing seat 115, as well as a copper sleeve 702, a limit block 703, and an anti-rotation pin 704.

[0088] Furthermore, the left center point bracket 101 is fixed on the base 701 by bolts.

[0089] Further, a through hole for setting the left center 109 is formed on the left center support 101. Specifically, the copper sleeves 702 are fixedly assembled at the front and rear ends within the through hole. The left center sleeve 108 is slidably disposed within the copper sleeve 702. The tail end of the left center 109 is inserted into the right end opening of the left center sleeve 108, and the tip end of the left center 109 extends out of the left center sleeve 108. The left end of the left center sleeve 108 is connected to the left center link 107 through a rotating shaft 705 (pin shaft). Moreover, the left center link 107 is further connected to the left center handle rotating lever 106 through the rotating shaft 705 (pin shaft). The left center handle 105 is assembled on the left center handle rotating lever 106 by interference fit. Further, rotating the left center handle 105 can push the left center sleeve 108 to slide axially within the copper sleeve 702 through the left center handle rotating lever 106 and the left center link 107, and then push the left center 109 to slide axially. Among them, after the left center 109 is pushed in place by the left center handle 105 (the left center handle rotating lever 106 abuts against the limit block 703), it also plays a positioning role for the crankshaft 600.

[0090] Further, the limit block 703 is assembled on the surface of the left center support 101 by interference fit to limit the rotation angle of the left center handle rotating lever 106.

[0091] Further, a left center sleeve transmission plate 114 is also fixedly connected to the left end of the left center sleeve 108 by bolts for fixedly connecting the transmission rod 303.

[0092] Further, a slot is also formed on the upper surface of the left center sleeve 108. By inserting the anti-rotation pin 704 through the left center support 101 and into the slot, the left center sleeve 108 can be prevented from rotating during the sliding process. The anti-rotation pin 704 is fixedly connected to the left center support 101 by bolts.

[0093] Further, the left center measuring sleeve 102 is sleeved at a position close to the tip end of the left center 109. Moreover, a plurality of blind holes (4 are set in this embodiment) are circumferentially spaced on the left side end face of the left center measuring sleeve 102. One end of the left center measuring sleeve spring 110 (4 are corresponding to the blind holes) is disposed inside it, and the other end of the left center measuring sleeve spring 110 abuts against the right end face of the left center sleeve 108. A left center measuring sleeve ball head 111 is also provided on the left center measuring sleeve 102, and the left center measuring sleeve ball head 111 is disposed close to the edge.

[0094] Further, at a position on the left center support 101, near the tip end of the left center 109, a left center tip end plate connection block 112 is also fixedly connected by bolts; and, a left center tip end plate 113 is also fixedly connected by bolts on the left center tip end plate connection block 112. The left center tip end plate 113 is located at the tip end of the left center 109, and the left center 109 can extend through the opening of the left center tip end plate 113.

[0095] Further, a left center measuring lever 103 (approximately an isosceles obtuse triangle, with the rotating shaft 705 at the center) is also rotatably connected by a rotating shaft 705 on the left center tip end plate connection block 112. One end of the left center measuring lever 103 (the end near the left center 109) extends along the movement path of the left center measuring sleeve ball head 111. Thus, during the movement of the left center measuring sleeve ball head 111 following the left center measuring sleeve 102 (and the left center sleeve 108), it will press against the left center measuring lever 103 and push it to rotate. The left center measuring lever 103 stops rotating after the left center measuring sleeve 102 abuts against the end face of the crankshaft 600.

[0096] Further, at a position on the left center support 101, on the side of the left center sleeve 108, a left center sensor fixing seat 115 is also fixedly connected by bolts. The first dial indicator 104 is assembled on the left center support 101 through the left center sensor fixing seat 115, and the sensing direction of the first dial indicator 104 is parallel to the left center 109. The head of the first dial indicator 104 extends to the other end of the left center measuring lever 103 (the end far from the left center 109) and abuts against the left center measuring lever 103; thus, when the left center measuring lever 103 rotates, it will squeeze the first dial indicator 104, so that the first dial indicator 104 can record the linear displacement of the left center measuring lever 103 and obtain the dimension of the left end face of the crankshaft 600.

[0097] The right center measuring mechanism 200, as Figure 4 、 8 shown in Figures 10 and 11, specifically includes a right center support 201, a right center measuring plate 202, a second dial indicator 203, a right center lever 204, a third dial indicator 205, a right center handle 206, a right center handle rotating lever 207, a right center connecting rod 208, a right center sleeve 209, a right center 210, a right center end cover 211, a right center sensor fixing seat 212, a right center lever ball head 213, a crankshaft end face sensor fixing seat 214, as well as a copper sleeve 702, a limit block 703, and an anti-rotation pin 704.

[0098] Further, the right center support 201 is fixedly bolted to the base 701.

[0099] Further, a through hole for setting the right center 210 is provided on the right center support 201. Specifically, the copper sleeves 702 are fixedly assembled at the front and rear ends within the through hole. The right center sleeve 209 is slidably disposed within the copper sleeve 702. The tail end of the right center 210 is inserted into the left end opening of the right center sleeve 209, and the tip end of the right center 210 extends out of the right center sleeve 209. The right end of the right center sleeve 209 is connected to the right center link 208 through a rotating shaft 705 (pin shaft). Moreover, the right center link 208 is further connected to the right center handle rotating lever 207 through a rotating shaft 705 (pin shaft). The right center handle 206 is assembled on the right center handle rotating lever 207 through interference fit. Further, rotating the right center handle 206 can push the right center sleeve 209 to slide axially within the copper sleeve 702 through the right center handle rotating lever 207 and the right center link 208, thereby pushing the right center 210 to slide axially. The center lines of the left center 109 and the right center 210 are on the same straight line to ensure accurate centering during the positioning of the crankshaft 600. Among them, by controlling the rotation angle of the right center handle 206 (not completely rotating until it abuts against the limit block 703), the extending distance of the right center 210 is controlled to achieve the floating of the right center 210, and thus it can be applied to the insertion and measurement of crankshafts 600 of different sizes.

[0100] Further, the limit block 703 is assembled on the surface of the right center support 201 through interference fit to limit the rotation angle of the right center handle rotating lever 207.

[0101] Further, a right center measuring plate 202 is also fixedly connected to the right end of the right center sleeve 209 through bolts. Moreover, a right center sensor fixing seat 212 is fixedly connected to the right center support 201 at a position near the right end of the right center sleeve 209 and on the side of the right center sleeve 209 through bolts. The second dial indicator 203 is assembled on the right center support 201 through the right center sensor fixing seat 212, and the sensing direction of the second dial indicator 203 is parallel to the right center 210. The head of the second dial indicator 203 extends to the surface of the right center measuring plate 202 and abuts against the right center measuring plate 202. Further, the displacement distance of the right center sleeve 209 driving the right center measuring plate 202 to move axially can be recorded by the second dial indicator 203, and thus the size of the center hole of the crankshaft 600 can be obtained.

[0102] Further, a slot is also provided on the upper surface of the right center sleeve 209. By inserting the anti-rotation pin 704 through the right center support 201 and into the slot, the right center sleeve 209 can be prevented from rotating during the sliding process. The anti-rotation pin 704 is fixedly connected to the right center support 201 through bolts.

[0103] Further, the right top end cover 211 is fixed to the right top support 201 by bolts at the position of the top end of the right top 210, and the right top 210 can extend out through the opening of the right top end cover 211.

[0104] Further, at the position on the right top support 201 near the top end of the right top 210, a crankshaft end face sensor fixing seat 214 is fixed by bolts, and the third dial indicator 205 is fixed to the right top support 201 through this crankshaft end face sensor fixing seat 214. A right top lever 204 is also installed on this crankshaft end face sensor fixing seat 214 through a rotating shaft 705. The right top lever 204 is of an L-shaped structure, with a rotating shaft 705 provided at its turning point. One end of it is arranged at the front end (in the movement path) of the right top sleeve 209, and the other end abuts against the third dial indicator 205 (the right top lever 204 abuts against the dial head of the third dial indicator 205). Right top lever ball heads 213 are respectively arranged on the end faces at both ends of the right top lever 204. Among them, the right top lever ball head 213 on the end face near the crankshaft 600 is arranged close to the free end, and the right top lever ball head 213 on the end face near the third dial indicator 205 is arranged at the abutting position between the right top lever 204 and the third dial indicator 205. Further, when the right top sleeve 209 is pushed out, it will drive the right top lever 204 to rotate, so as to drive the third dial indicator 205 to record its displacement data, thereby obtaining the size of the right end face of the crankshaft 600.

[0105] The thrust face measuring mechanism 300, as Figure 4 、 9 shown in FIGS. 10 and 11, specifically includes a slider guide seat 301, a fourth dial indicator 302, a transmission rod 303, a thrust face lever 304, a slider 305, a slider guide 306, a thrust face measuring rod 307, a slider spring 308, a limit screw 309, and a measuring ball head 310.

[0106] Further, the slider guide seat 301 is of a C-shaped structure, with its opening facing the crankshaft 600; and the slider guide seat 301 is fixed to the base 701 by bolts.

[0107] Further, slider guides 306 are fixedly arranged on the upper and lower horizontal surfaces of the slider guide seat 301 parallel to the center line of the crankshaft 600, and a slider 305 is slidably connected to the slider guides 306 to form a guide pair.

[0108] Further, a thrust face lever 304 is rotatably connected to the middle of the slider guide seat 301 through a rotating shaft 705. The rotating shaft 705 is located in the middle of the thrust face lever 304, and both ends of the thrust face lever 304 are respectively connected to the slider 305.

[0109] Further, a thrust surface measuring rod 307 is fixedly arranged on the slider 305. The thrust surface measuring rod 307 has a T-shaped structure, and its protruding end faces the crankshaft 600. A measuring ball head 310 is arranged at a position near the top of the side wall surface of the protruding end of the thrust surface measuring rod 307, and the measuring ball heads 310 of the upper and lower two thrust surface measuring rods 307 face away from each other to respectively abut against the thrust surface 605.

[0110] Further, one side of the slider 305 is connected to the inner wall surface of the slider guide seat 301 through a slider spring 308.

[0111] Further, limit screws 309 are respectively connected to the slider guide seats 301 on both sides of the slider 305 through threads. By adjusting the positions of the limit screws 309, the limit on the movement distance of the slider 305 can be adjusted. Threaded holes are provided on the slider guide seats 301 for screwing the limit screws 309. At the same time, the slider guide seats 301 are locked by nuts on the outside.

[0112] Further, the slider spring 308 is sleeved outside the limit screw 309 on one side of the slider 305.

[0113] Further, fourth dial indicators 302 are respectively arranged on the sides of the upper and lower sliders 305. They are fixedly installed on the slider guide seats 301, and the gauges abut against the side wall surface of the thrust surface lever 304.

[0114] Further, one end of the transmission rod 303 is fixedly connected to the left center sleeve transmission plate 114, and the other end abuts against the side wall surface (the lower end in this embodiment) of one end of the thrust surface lever 304.

[0115] Furthermore, after the left center 109 is pushed into the center hole of the crankshaft 600 by the left center handle 105, the left center sleeve 108 pushes the transmission rod 303 through the left center sleeve transmission plate 114. The transmission rod 303 further pushes the thrust surface lever 304 to rotate it (counterclockwise rotation in this embodiment). Thus, the thrust surface lever 304 further drives the slider 305 to slide in the slider guide 306 and drives the thrust surface measuring rod 307 to move horizontally, so that the measuring ball head 310 on the side of the thrust surface measuring rod 307 (arranged in the upper left and lower right manner in this embodiment) abuts against the thrust surface 605 of the crankshaft 600. When the left center 109 is retracted to release the positioning of the crankshaft 600, the transmission rod 303 is retracted, and under the elastic action of the slider spring 308, the thrust surface lever 304 returns to its original position.

[0116] The fixed-angle mechanism 400, such as Figure 4 、 5, as shown in FIGS. 10 and 11, specifically including a fixed-angle bracket 401, an expansion shaft 402, a fixed-angle jaw seat 403, fixed-angle jaws 404, a fixed-angle jaw spring 405, a fixed-angle handle shaft 406, an eccentric shaft 407, a dial 408, and a fixed-angle jaw spring seat 409.

[0117] Furthermore, the fixed-angle bracket 401 is fixed to the base 701 by bolts.

[0118] Furthermore, a through hole is provided on the fixed-angle bracket 401, and the expansion shaft 402 is disposed through the through hole. The expansion shaft 402 is a columnar shaft and is fixedly provided with a long strip plate structure in the shape of a near-rounded rectangle thereon. As shown in FIG. 10, its cross-section is in a "cross" shape structure.

[0119] Furthermore, the fixed-angle jaw seat 403 is fixed to the fixed-angle bracket 401 by bolts.

[0120] Furthermore, the fixed-angle jaws 404 are rotatably connected to the fixed-angle jaw seat 403 through a rotating shaft 705. A pair of fixed-angle jaws 404 are arranged one above the other and are rotatably connected to the fixed-angle jaw seat 403 through the rotating shaft 705 provided at their centers. The end face (the opposite end faces of the two fixed-angle jaws 404) of the fixed-angle jaw 404 near the fixed-angle bracket 401 is set as an arc surface, and this arc surface abuts against the front end of the expansion shaft 402. And, a fixed-angle jaw spring 405 is provided inside the fixed-angle jaw seat 403 at a position near the rear end of the fixed-angle jaw 404 (the part provided with the arc surface). One end of the fixed-angle jaw spring 405 is fixedly assembled to the fixed-angle jaw seat 403 through the fixed-angle jaw spring seat 409, and the other end is connected to the fixed-angle jaw 404. Thus, when the expansion shaft 402 moves axially, the rotation of the fixed-angle jaw 404 can be realized through the extrusion of the long strip plate structure on the arc surface or the elastic force release of the fixed-angle jaw spring 405, so as to realize the clamping positioning and anti-rotation of the connecting rod journal 604 of the crankshaft 600.

[0121] Furthermore, a dial 408 is fixedly connected to the rear end of the expansion shaft 402; a fixed-angle handle shaft 406 is also assembled through a fixed seat on the rear side of the fixed-angle bracket 401. The upper end of the fixed-angle handle shaft 406 is assembled with a fixed-angle handle through interference fit, and the lower end is fixedly connected with an eccentric shaft 407, and the eccentric shaft 407 is rotatably connected to the dial 408. Thus, by rotating the fixed-angle handle, the fixed-angle handle shaft 406 can be driven to rotate, and the eccentric shaft 407 is promoted to rotate to drive the dial 408 to move back and forth (along the axial direction of the expansion shaft 402), so as to realize the rotation control of the fixed-angle jaw 404 and complete the switching between the open and clamped states of the fixed-angle jaw 404.

[0122] The crankshaft bracket mechanism 500, such as Figure 4 ,5 As shown in FIGS. 10 and 11, it specifically includes a crankshaft bracket 501, a crankshaft tray 502, a crankshaft bracket slider 503, a crankshaft bracket guide rail 504, and a crankshaft bracket guide rail base 505.

[0123] Furthermore, the crankshaft bracket guide rail base 505 is fixed to the base 701 by bolts.

[0124] Furthermore, the crankshaft bracket guide rail 504 is fixed to the crankshaft bracket guide rail base 505 perpendicular to the center line direction of the left center point 109, and the crankshaft bracket guide rail 504 is arranged opposite to the thrust surface measuring mechanism 300. The crankshaft bracket slider 503 is slidably arranged in the crankshaft bracket guide rail 504 to form a guide pair.

[0125] Furthermore, the crankshaft tray 502 is fixedly connected to the crankshaft bracket slider 503.

[0126] Furthermore, the crankshaft bracket 501 is fixedly connected to the crankshaft tray 502 for carrying the crankshaft 600; when the crankshaft 600 is placed on the crankshaft bracket 501, its center line is parallel to the center line of the left center point 109, and when the crankshaft bracket slider 503 is pushed to the innermost side, the center line of the crankshaft 600 is basically on the same straight line as the center lines of the left center point 109 and the right center point 210 for positioning by the center points. The supporting positions of the crankshaft bracket 501 just correspond to the connecting rod journals 604 at both ends of the crankshaft 600. Therefore, the bracket structure on the right side of the crankshaft bracket 501 corresponds to the fixed angle mechanism 400.

[0127] Furthermore, a handle for easy dragging is also provided on the crankshaft bracket 501.

[0128] This inspection tool adopts the comparative measurement method to measure the dimensions of the crankshaft 600. During use, first, the dial indicator readings of a standard crankshaft 600 with determined dimensions are measured by this inspection tool to obtain standard data; subsequently, any crankshaft 600 to be measured is measured, and the obtained dial indicator readings are compared with the standard data, so that the dimensional deviation and dimensional data of the crankshaft 600 to be measured compared with the standard crankshaft 600 can be obtained.

[0129] When this inspection tool is in use, first place the inspection tool to be detected on the crankshaft bracket 501, and send it into the detection position through the crankshaft bracket guide rail 504, so that the center line of the crankshaft 600 is roughly coincident with the left center point 109 and the right center point 210; Subsequently, operate the fixed-angle handle to make the fixed-angle claw 404 clamp the connecting rod neck 604 near the right side of the crank to prevent the crankshaft 600 from rotating; Then, operate the right center point handle 206 to make the right center point 210 extend into the right center hole of the crankshaft 600 for rough positioning. At the same time, the second dial indicator 203 and the third dial indicator 205 respectively record the displacement distances of the right center point measuring plate 202 and the right center point lever 204; Next, operate the left center point handle 105 to make the left center point 109 extend into the left center hole of the crankshaft 600 for precise positioning. At the same time, the first dial indicator 104 records the displacement distance of the left center point measuring lever 103; And, while operating the left center point handle 105, the transmission rod 303 drives the thrust surface lever 304 to rotate, so that the measuring ball head 310 on the thrust surface measuring rod 307 abuts against the thrust surface 605 of the crankshaft 600, and the fourth dial indicator 302 records the displacement distance of the thrust surface lever 304. Thus, precise measurement of multiple parameters of the crankshaft 600 (including the dimensions of both end faces, the center hole, and the two thrust surfaces 605) can be achieved through simple operation steps.

[0130] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A fixture for measuring the center hole, end face and thrust face of a crankshaft, characterized in that, It includes a left center measuring mechanism (100), a right center measuring mechanism (200) and a thrust surface measuring mechanism (300); The left center measuring mechanism (100) includes a left center support (101), a left center unit, a left center measuring sleeve (102), a left center measuring lever (103) and a first dial indicator (104); the left center unit is slidably arranged on the left center support (101), the left center measuring sleeve (102) is sleeved outside the left center unit, the left center measuring lever (103) is rotatably connected to the left center support (101) and one end of the left center measuring lever (103) is arranged on the movement path of the left center measuring sleeve (102), and the first dial indicator (104) abuts against the other end of the left center measuring lever (103); The right center measuring mechanism (200) includes a right center support (201), a right center unit, a right center measuring plate (202), a second dial indicator (203), a right center lever (204) and a third dial indicator (205); the right center unit is slidably arranged on the right center support (201), the right center measuring plate (202) is assembled on the right center unit, the second dial indicator (203) abuts against the right center measuring plate (202); the right center lever (204) is rotatably connected to the right center support (201) and one end of the right center lever (204) is arranged on the movement path of the right center unit, and the third dial indicator (205) abuts against the other end of the right center lever (204); The left center unit and the right center unit are arranged facing each other, and the center line of the left center unit coincides with the center line of the right center unit for jointly positioning the crankshaft (600); The thrust surface measuring mechanism (300) includes a slider guide base (301), a following rotation unit, a fourth dial indicator (302) and a transmission rod (303); the transmission rod (303) is connected between the left center unit and the following rotation unit, the middle of the following rotation unit is rotatably connected to the slider guide base (301) and both ends of the following rotation unit are slidably connected to the slider guide base (301), the following rotation unit faces the crankshaft (600), and the fourth dial indicator (302) abuts against the following rotation unit.

2. The inspection tool for measuring the center hole, end face and thrust face of a crankshaft according to claim 1, wherein, The left center unit includes a left center handle (105), a left center handle rotating lever (106), a left center connecting rod (107), a left center sleeve (108) and a left center (109); The left center sleeve (108) is slidably arranged on the left center support (101); The first end of the left center sleeve (108) is sleeved outside the tail end of the left center (109), the second end of the left center sleeve (108) is rotatably connected to the first end of the left center connecting rod (107), the left center handle rotating lever (106) is rotatably connected to the second end of the left center connecting rod (107), and the left center handle (105) is assembled on the left center handle rotating lever (106); The described left center measuring sleeve (102) is sleeved outside the tip of the left center (109), and the left center measuring sleeve (102) abuts against the first end of the left center sleeve (108); One end of the described transmission rod (303) is connected to the left center sleeve (108).

3. A fixture for measuring the center hole, end face and thrust face of a crankshaft according to claim 2, characterized in that, A plurality of blind holes are circumferentially formed at the second end of the left center measuring sleeve (102), and a left center measuring sleeve spring (110) is arranged in the blind holes, and the left center measuring sleeve spring (110) abuts between the left center measuring sleeve (102) and the left center sleeve (108); A left center measuring sleeve ball head (111) is assembled at the first end of the left center measuring sleeve (102), and the left center measuring lever (103) is arranged on the movement path of the left center measuring sleeve ball head (111).

4. A fixture for measuring the center hole, end face and thrust face of a crankshaft according to claim 1, characterized in that, The described right center unit includes a right center handle (206), a right center handle rotating lever (207), a right center connecting rod (208), a right center sleeve (209) and a right center (210); The described right center sleeve (209) is slidably arranged on the right center support (201); The first end of the described right center sleeve (209) is sleeved outside the tail end of the right center (210), the second end of the right center sleeve (209) is rotatably connected to the first end of the right center connecting rod (208), the right center handle rotating lever (207) is rotatably connected to the second end of the right center connecting rod (208), and the right center handle (206) is assembled on the right center handle rotating lever (207); The described right center measuring plate (202) is assembled at the second end of the right center sleeve (209); The described right center lever (204) is arranged on the movement path of the right center sleeve (209).

5. A fixture for measuring the center hole, end face and thrust face of a crankshaft according to claim 1, characterized in that, The described follow-up unit includes a thrust surface lever (304), a slider (305), a slider guide (306), a thrust surface measuring rod (307) and a slider spring (308); The middle part of the described thrust surface lever (304) is rotatably connected to the slider guide seat (301), and both ends of the thrust surface lever (304) are respectively connected to the slider (305); The described slider guide (306) is assembled on the slider guide seat (301) and the slider guide (306) is arranged parallel to the center line of the left center unit; the slider (305) is slidably connected to the slider guide (306); The described slider spring (308) is connected between the slider (305) and the slider guide seat (301); The described thrust surface measuring rod (307) is assembled on the slider (305) and the thrust surface measuring rod (307) faces the crankshaft (600); One end of the described transmission rod (303) abuts against the end of the thrust surface lever (304); The described fourth dial indicator (302) abuts against the end of the thrust surface lever (304).

6. The inspection tool for measuring the center hole, end face and thrust face of a crankshaft according to claim 5, characterized in that, The described following-rotation unit further includes a limit screw (309), the limit screw (309) is threadedly connected to the slider guide seat (301), and the limit screw (309) is arranged on the movement path of the slider (305); the slider spring (308) is sleeved on the limit screw (309). The thrust surface measuring rod (307) is of a T-shaped structure, and a measuring ball head (310) is arranged at one end of the thrust surface measuring rod (307) extending towards the crankshaft (600).

7. A gauge for measuring the center hole, end face and thrust face of a crankshaft according to claim 1, characterized in that, The described inspection tool further includes a fixed-angle mechanism (400). The fixed-angle mechanism (400) includes a fixed-angle bracket (401), an expansion shaft (402), a fixed-angle jaw seat (403), fixed-angle jaws (404), a fixed-angle jaw spring (405), and a handle driving unit. The expansion shaft (402) is movably connected to the fixed-angle bracket (401), one end of the expansion shaft (402) is connected to the handle driving unit, and the other end of the expansion shaft (402) abuts against the fixed-angle jaws (404). The fixed-angle jaw seat (403) is assembled on the fixed-angle bracket (401), and the fixed-angle jaws (404) are rotatably connected to the fixed-angle jaw seat (403). One end of the fixed-angle jaw spring (405) is assembled on the fixed-angle jaw seat (403), and the other end of the fixed-angle jaw spring (405) is connected to the fixed-angle jaws (404). The end surface of the fixed-angle jaw (404) abutting against the expansion shaft (402) is an arc surface.

8. A fixture for measuring the center hole, end face and thrust face of a crankshaft according to claim 7, characterized in that, The handle driving unit includes a fixed-angle handle, a fixed-angle handle shaft (406), an eccentric shaft (407), and a dial (408). The dial (408) is assembled at one end of the expansion shaft (402), the fixed-angle handle shaft (40) is connected to the dial (408) through the eccentric shaft (407), and the fixed-angle handle is assembled on the fixed-angle handle shaft (406).

9. The checking fixture for measuring the center hole, end face and thrust face of a crankshaft according to claim 1, characterized in that The described inspection tool further includes a crankshaft bracket mechanism (500). The crankshaft bracket mechanism (500) includes a crankshaft bracket (5), a crankshaft tray (502), a crankshaft bracket slider (503), a crankshaft bracket guide rail (504), and a crankshaft bracket guide rail base (505). The crankshaft bracket guide rail (504) is arranged on the crankshaft bracket guide rail base (505). The crankshaft bracket slider (503) is slidably assembled on the crankshaft bracket guide rail (504). The crankshaft tray (502) is connected to the crankshaft bracket slider (503). The crankshaft bracket (501) is connected to the crankshaft tray (502), and the crankshaft bracket (501) is used to support the crankshaft (600).

10. A fixture for measuring the center hole, end face and thrust face of a crankshaft according to claim 9, characterized in that, The crankshaft bracket guide rail (504) is arranged perpendicular to the center line of the left center point unit; when the crankshaft (600) is arranged on the crankshaft bracket (501), the center line of the crankshaft (600) is parallel to the center line of the left center point unit.

Images