Crankshaft groove depth and coaxiality gauge

Abstract

The utility model discloses a kind of crankshaft sink depth and coaxality gauges, including table frame, dial gauge, table rule, clamping plate and base;The dial gauge is fixed on table frame by bolt;The table rule is fixed on base by clamping plate and bolt cooperation;Wherein:The upper part of table frame is inverted U-shaped structure block;The upper portion of inverted U-shaped structure block is provided with a through hole along vertical direction, and is provided with a threaded fixing hole along horizontal direction with through hole through;The lower part of table frame is two inverted V-shaped structure blocks;The upper surface of inverted V-shaped structure block is provided with recess;The bottom of inverted U-shaped structure block is fixedly installed in the recess of inverted V-shaped structure block.The utility model is simple in structure, and detection is fast and convenient, and practicality is strong, especially effectively solve the problem that 2~7mm wide crankshaft sink depth and coaxality detection are difficult, and it is suitable for popularization and use in mass industrial production.

Description

Technical Field

[0001] This utility model belongs to the field of automobile engine crankshaft machining and inspection technology, specifically involving a crankshaft groove depth and coaxiality inspection tool. Background Technology

[0002] Besides issues like starting failure, vibration, overheating, and low oil pressure, engine oil leaks from the crankshaft front and rear oil seals are another common problem. Engine oil leaks can cause numerous problems. First, the oil level gradually decreases, leading to insufficient lubrication of engine components, accelerated wear, and potentially serious malfunctions like cylinder scoring and bearing failure over time, significantly reducing engine lifespan. Second, leaks can cause unstable internal engine pressure, affecting normal operation, resulting in decreased power, increased fuel consumption, and symptoms like vehicle vibration and sluggish acceleration. Furthermore, leaking oil coming into contact with hot components poses a fire risk, seriously threatening driving safety.

[0003] The machining quality of the countersunk grooves at the front or rear of the crankshaft directly affects the installation, sealing performance, and lifespan of the oil seals, potentially causing oil leaks at the front or rear of the engine. Narrow countersunk grooves, in particular, may present the following problems during inspection:

[0004] 1. The outer diameter of the countersink cannot be measured using general-purpose measuring tools such as digital calipers or micrometers. Conventional measurement uses diameter gauges, but when the gauge thickness is less than 5mm, deformation is easy to occur and difficult to detect, leading to misjudgments and missed shipments. If a crankshaft with an excessively large countersink diameter is shipped, it will prevent the installation of the oil seal; if the countersink diameter is too small, it will result in an excessive gap between the crankshaft and the oil seal, directly causing oil leakage. Furthermore, the data cannot be directly detected, making adjustments inconvenient.

[0005] 2. The conventional instrument for testing crankshaft coaxiality is the ADCOLE measuring instrument. However, the probe of the ADCOLE measuring instrument is 2.5mm, which cannot be used to measure when the groove width is less than 4mm. In addition, the ADCOLE measuring instrument is a precision instrument and cannot perform 100% inspection of the crankshaft. There is a risk of defective products leaving the factory, which will seriously affect the oil seal sealing performance and cause oil leakage. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a crankshaft undercut depth and coaxiality inspection tool. This tool has a simple structure, low operating cost, accurate inspection structure, and simple operation method. It can quickly determine whether the crankshaft undercut depth and coaxiality are up to standard, preventing the shipment of crankshafts with substandard undercut depth and coaxiality. This effectively solves the quality problems of engine oil leakage or inability to install oil seals caused by crankshaft undercut issues.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A crankshaft groove depth and coaxiality gauge includes a gauge holder, a dial indicator, a calibration gauge, a clamping plate, and a base. The dial indicator is fixed to the gauge holder by bolts. The calibration gauge is fixed to the base by the clamping plate and bolts. The upper part of the gauge holder is an inverted U-shaped structural block. The upper part of the inverted U-shaped structural block has a through hole with a diameter 0-0.05 mm larger than the diameter of the dial indicator's fixing rod along the vertical direction, and a threaded fixing hole communicating with the through hole along the horizontal direction. The lower part of the gauge holder consists of two inverted V-shaped structural blocks. The upper surface of each inverted V-shaped structural block has a groove. The width of the groove is 0-0.05 mm wider than the bottom width of the inverted U-shaped structural block. The bottom of each inverted U-shaped structural block is fixedly installed within the groove of the inverted V-shaped structural block.

[0009] In this invention, the width of the inverted V-shaped structural block is determined according to the diameter of the crankshaft countersunk journal; that is, when the V-shaped block is placed on the crankshaft countersunk journal, the contact point needs to be within the two endpoints of the V-shaped surface. The inverted U-shaped structural block and the inverted V-shaped structural block can be fixedly installed by welding. The fixing rod of the dial indicator is inserted into the through hole of the indicator holder, and then a bolt is screwed into the threaded fixing hole to fix the dial indicator.

[0010] As a further explanation of this utility model, the included angle of the inverted V-shaped structural block is 90° or 120°, and the roughness of the inner surface of the inverted V-shaped structural block is Ra0.2, so as to avoid scratching the calibration gauge and the crankshaft countersunk journal.

[0011] As a further explanation of this utility model, the calibration gauge consists of two parts: a calibration column and a mandrel; the outer diameter of the calibration column is consistent with the diameter of the countersunk journal of the crankshaft standard part; the countersunk size of the calibration column is consistent with the countersunk size of the crankshaft standard part; the length of the mandrel is 20-100mm wider than the width of the calibration column, and the calibration column is fixed in the middle position of the mandrel.

[0012] The width of the groove on both sides of the alignment column can be set to 5-20mm. The inner diameter of the alignment column can be designed to be one of the appropriate sizes from φ10 to φ50mm, depending on the outer diameter.

[0013] As a further explanation of this utility model, the middle part of the clamping plate has an arc structure, and the radius of the arc is consistent with the mandrel radius of the calibration gauge; both ends of the clamping plate are provided with threaded mounting holes I.

[0014] The width of the clamp can be set to 8-30mm.

[0015] As a further explanation of this utility model, the base consists of two identical support plates and a bottom plate; the top center of the support plate is provided with an arc groove, the radius of which is consistent with the mandrel radius of the calibration gauge; the top two ends of the support plate are provided with threaded mounting holes II corresponding to the threaded mounting holes I of the clamping plate; the bottom of the support plate is fixedly mounted on the bottom plate.

[0016] The width and thickness of the support plate can be the same as, or slightly larger than, the width and thickness of the clamping plate; the height of the support plate is determined according to the outer diameter of the calibration column of the gauge, ensuring that the gauge does not touch the base plate. The distance between the two support plates is determined according to the length of the mandrel of the calibration gauge. The two ends of the mandrel of the calibration gauge are placed within the arc groove of the support plate and the arc structure of the clamping plate, and then the clamping plate is tightened with bolts to fix the calibration gauge.

[0017] As a further explanation of this utility model, the base plate is a square plate, with a length greater than the length of the mandrel of the calibration gauge, a width consistent with the width of the support plate, and a thickness of 10-20mm. The base plate and the support plate can be connected by welding or by drilling and fixing with mounting bolts.

[0018] How to use this utility model:

[0019] 1) Select the appropriate inspection tool according to the crankshaft model to be processed, and prepare the crankshaft.

[0020] 2) Calibration:

[0021] ① Place the dial indicator stand on the calibration gauge and attach the dial indicator probe to the outer circular surface of the calibration gauge groove.

[0022] ② Rotate the dial of the micrometer until the large needle aligns with the value marked on the dial gauge. The "0" point on the dial is the basic dimension of the sink depth. Remember the value that the small needle on the dial of the micrometer should align with.

[0023] ③ Lift the watch stand.

[0024] 3) Measurement:

[0025] ① Place the dial indicator stand on the crankshaft groove journal, place the dial indicator probe against the outer surface of the crankshaft groove, record the values ​​on the dial indicator dial and inner dial, and compare them with the values ​​on the dial ("0" point) and inner dial (the value of the small dial) during calibration to obtain the actual depth of the crankshaft groove.

[0026] ② Rotate the crankshaft one revolution and record the maximum and minimum values ​​of the dial indicator reading. The difference between the maximum and minimum values ​​is the radial runout error of the crankshaft groove, which is approximately the coaxiality error of the crankshaft groove.

[0027] ③ Lift the gauge stand to complete the crankshaft groove depth and coaxiality testing.

[0028] The beneficial effects of this utility model are as follows:

[0029] The inspection tool of this utility model has a simple structure, low cost, strong applicability, accurate detection structure, and simple, fast and easy-to-understand detection method. It can quickly determine whether the crankshaft groove depth and coaxiality are qualified. In particular, it effectively solves the problem of difficult detection of crankshaft groove depth and coaxiality with a width of 2-7mm, avoiding the shipment of products with unqualified crankshaft groove depth and coaxiality. Thus, it effectively solves the quality problems of engine oil leakage or inability to install oil seals caused by crankshaft groove problems. It is suitable for promotion and use in mass industrial production. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the front view structure of an embodiment of the present utility model.

[0031] Figure 2 for Figure 1 Side view.

[0032] Figure 3 This is a schematic diagram of the main structure of the watch frame in one embodiment of the present utility model.

[0033] Figure 4 for Figure 3 Side view.

[0034] Figure 5 This is a schematic diagram of the main structure of the calibration gauge in one embodiment of this utility model.

[0035] Figure 6 for Figure 5 Enlarged view of section I.

[0036] Figure 7 This is a side view of the clamping plate in one embodiment of the present invention.

[0037] Figure 8 for Figure 7 Top view.

[0038] Figure 9 This is a schematic diagram of the main structure of the base in one embodiment of the present invention.

[0039] Figure 10 for Figure 9 Side view.

[0040] Figure 11 for Figure 9 Top view.

[0041] Figure 12 This is a schematic diagram of the usage state in one embodiment of the present invention.

[0042] In the diagram: 1-Dial holder, 101-Through hole, 102-Threaded fixing hole; 2-Dial indicator; 3-Calibration gauge; 4-Clamping plate; 5-Base. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings.

[0044] Example 1: As Figure 1 and Figure 2 As shown, a crankshaft groove depth and coaxiality gauge includes a gauge frame 1, a dial indicator 2, a calibration gauge 3, a clamping plate 4, and a base 5; the dial indicator 2 is fixed to the gauge frame 1 by bolts; the calibration gauge 3 is fixed to the base 5 by the clamping plate 4 and bolts.

[0045] like Figure 3 and Figure 4 As shown, the upper part of the meter holder 1 is an inverted U-shaped structural block; the upper part of the inverted U-shaped structural block has a through hole 101 with a diameter 0.05 mm larger than the diameter of the fixing rod of the dial gauge 2 along the vertical direction, and a threaded fixing hole 102 communicating with the through hole 101 along the horizontal direction; the lower part of the meter holder 1 consists of two inverted V-shaped structural blocks; the upper surface of the inverted V-shaped structural blocks has a groove; the width of the groove is 0.05 mm wider than the bottom width of the inverted U-shaped structural blocks; the bottom of the inverted U-shaped structural blocks is fixedly installed in the groove of the inverted V-shaped structural blocks.

[0046] like Figure 5 and Figure 6 As shown, the calibration gauge 3 consists of two parts: a calibration column and a mandrel. The outer diameter of the calibration column is consistent with the diameter of the countersunk journal of the crankshaft standard part. The countersunk depth of the calibration column is consistent with the countersunk depth of the crankshaft standard part. The length of the mandrel is 50mm wider than the width of the calibration column, and the calibration column is fixed in the middle position of the mandrel.

[0047] like Figure 7 and Figure 8 As shown, the middle part of the clamping plate 4 is an arc structure, and the radius of the arc is consistent with the mandrel radius of the calibration gauge 3; the two ends of the clamping plate 4 are provided with threaded mounting holes I.

[0048] like Figure 9 , Figure 10 and Figure 11 As shown, the base 5 consists of two identical support plates and a bottom plate; the top center of the support plate is provided with an arc groove, the radius of which is consistent with the mandrel radius of the calibration gauge 1; the top two ends of the support plate are provided with threaded mounting holes II corresponding to the threaded mounting holes I of the clamping plate; the bottom of the support plate is fixedly mounted on the bottom plate.

[0049] The base plate is a square plate with a length greater than the mandrel length of the calibration gauge 3, a width consistent with the width of the support plate, and a thickness of 15mm.

[0050] The inverted V-shaped structural block has a lower included angle of 90°, and the roughness of the inner surface of the inverted V-shaped structural block is Ra0.2.

[0051] Example 2: The only difference between this example and Example 1 is that the included angle of the inverted V-shaped structure block is 120°, and the roughness of the inner surface of the inverted V-shaped structure block is Ra0.2.

[0052] Example 3: The only difference between this example and Example 1 is that the length of the mandrel is 20mm wider than the width of the alignment column; and the thickness of the base plate is 10mm.

[0053] Example 4: The only difference between this example and Example 2 is that the length of the mandrel is 100mm wider than the width of the alignment column; and the thickness of the base plate is 20mm.

[0054] The above embodiments are applied to crankshaft groove depth and coaxiality testing operations, such as... Figure 12 As shown, its usage method is as follows:

[0055] 1) Select the appropriate inspection tool according to the crankshaft model to be processed, and prepare the crankshaft.

[0056] 2) Calibration:

[0057] ① Place the dial indicator stand on the calibration gauge and attach the dial indicator probe to the outer circular surface of the calibration gauge groove.

[0058] ② Rotate the dial of the micrometer until the large needle aligns with the value marked on the dial gauge. The "0" point on the dial is the basic dimension of the sink depth. Remember the value that the small needle on the dial of the micrometer should align with.

[0059] ③ Lift the watch stand.

[0060] 3) Measurement:

[0061] ① Place the dial indicator stand on the crankshaft groove journal, place the dial indicator probe against the outer surface of the crankshaft groove, record the values ​​on the dial indicator dial and inner dial, and compare them with the values ​​on the dial ("0" point) and inner dial (the value of the small dial) during calibration to obtain the actual depth of the crankshaft groove.

[0062] ② Rotate the crankshaft one revolution and record the maximum and minimum values ​​of the dial indicator reading. The difference between the maximum and minimum values ​​is the radial runout error of the crankshaft groove, which is approximately the coaxiality error of the crankshaft groove.

[0063] ③ Lift the gauge stand to complete the crankshaft groove depth and coaxiality testing.

[0064] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description; it is neither necessary nor possible to exhaustively list all possible implementations here; however, obvious variations or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A crankshaft groove depth and coaxiality gauge, comprising a gauge holder (1), a dial indicator (2), a calibration gauge (3), a clamping plate (4), and a base (5); the dial indicator (2) is fixed to the gauge holder (1) by bolts; the calibration gauge (3) is fixed to the base (5) by the clamping plate (4) and bolts; characterized in that: The upper part of the meter holder (1) is an inverted U-shaped structural block; the upper part of the inverted U-shaped structural block is provided with a through hole (101) with a diameter 0-0.05 mm larger than the diameter of the fixing rod of the dial gauge (2) in the vertical direction, and a threaded fixing hole (102) communicating with the through hole (101) in the horizontal direction; the lower part of the meter holder (1) is two inverted V-shaped structural blocks; the upper surface of the inverted V-shaped structural blocks is provided with a groove; the width of the groove is 0-0.05 mm wider than the bottom width of the inverted U-shaped structural block; the bottom of the inverted U-shaped structural block is fixedly installed in the groove of the inverted V-shaped structural block.

2. The crankshaft undercove depth and concentricity gauge of claim 1, wherein: The included angle of the inverted V-shaped structural block is 90° or 120°, and the roughness of the inner surface of the inverted V-shaped structural block is Ra0.

2.

3. The crankshaft undercove depth and concentricity gauge of claim 1, wherein: The calibration gauge (3) consists of two parts: a calibration column and a mandrel. The outer diameter of the calibration column is consistent with the diameter of the grooved journal of the crankshaft standard part. The groove depth of the calibration column is consistent with the groove depth of the crankshaft standard part. The length of the mandrel is 20-100mm wider than the width of the calibration column, and the calibration column is fixed in the middle position of the mandrel.

4. The crankshaft undercove depth and concentricity gauge of claim 3, wherein: The middle part of the clamping plate (4) is an arc structure, and the radius of the arc is consistent with the mandrel radius of the calibration gauge (3); the two ends of the clamping plate (4) are provided with threaded mounting holes I.

5. The crankshaft groove depth and coaxiality inspection tool according to claim 4, characterized in that: The base (5) consists of two identical support plates and a bottom plate; the top middle position of the support plate is provided with an arc groove, the radius of which is consistent with the mandrel radius of the calibration gauge (3); the top two ends of the support plate are provided with threaded mounting holes II corresponding to the threaded mounting holes I of the clamping plate; the bottom of the support plate is fixedly mounted on the bottom plate.

6. The crankshaft groove depth and coaxiality inspection tool according to claim 5, characterized in that: The base plate is a square plate with a length greater than the length of the mandrel of the calibration gauge (3), a width consistent with the width of the support plate, and a thickness of 10-20 mm.

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