A crankshaft oil hole angle auxiliary inspection rod and oil hole angle inspection method

Abstract

The present invention discloses an auxiliary inspection rod for crankshaft oil hole angle and an oil hole angle inspection method. The inspection rod is a straight rod in the shape of a cylinder. The inspection rod is composed of two sections, a measuring rod one and a measuring rod two, with different diameters. The center lines of the measuring rod one and the measuring rod two are in a straight line. The diameter of the measuring rod one is larger than that of the measuring rod two. The circumference of the measuring rod one is provided with scale lines A and scale lines B. The diameter of the measuring rod two is 0.02 to 0.05 mm smaller than the diameter of the oil hole to be measured, and the length of the measuring rod two is larger than half of the depth of the oil hole to be measured. The auxiliary inspection rod of the present invention has a simple structure and is easy to process. The inspection method is simple to operate, practical and easy to promote. It is applicable to the inspection of the angles of all crankshaft oil holes relative to the center plane of the journal, and can also be used in the early stage of product development or during mass production. The present invention has low cost and strong versatility, and can quickly determine whether the angle of the oil hole to be measured belongs to the angle tolerance range.

Description

Technical Field

[0001] The invention belongs to the field of engine crankshaft processing, and relates to an auxiliary tool for inspecting the angle of a crankshaft oil hole relative to a journal center line on a platform and a method for inspecting the angle of the oil hole relative to the journal center plane, in particular to an auxiliary inspection rod for the crankshaft oil hole angle and a method for inspecting the oil hole angle. Background Art

[0002] The crankshaft is one of the core parts of the engine, and the oil hole inside the crankshaft plays a key role as a channel for lubricating oil to provide lubrication for the high-speed crankshaft. Therefore, the processing of the oil hole is an important process in crankshaft processing, which directly affects the lubrication and strength of the crankshaft and indirectly affects the service life of the engine. At present, in addition to the requirements for the inclination angle of the connecting spindle and the connecting rod, the oil hole needs to control the angle with the center line of the journal to ensure that the oil channel is in the specific position required by the design inside the crankshaft to avoid affecting the structural strength of the crankshaft.

[0003] In the field of crankshaft processing, the inspection of the oil hole angle requires the design and manufacture of a specific crankshaft or the purchase of a set of special oil hole angle inspection devices; this increases the development cycle and manufacturing costs for crankshaft development. If the key parameters of the crankshaft oil hole are adjusted during the development process or the crankshaft development and application are unsuccessful, manufacturing a special oil hole angle inspection device is a waste of resources. For this reason, a simple oil hole angle inspection tool and inspection method are needed in the crankshaft development stage to reduce this waste of resources. Summary of the invention

[0004] The present invention aims to solve the problem that before the development of the crankshaft, it is necessary to spend effort and cost to design and manufacture a crankshaft-specific oil hole angle inspection device, and provides a crankshaft oil hole angle auxiliary inspection rod and oil hole angle inspection method. The inspection rod has a simple structure and is easy to process. The inspection method is simple, ingenious and easy to promote. It can quickly determine whether the actual angle of the oil hole being tested is within the angle tolerance range.

[0005] The technical solution for achieving the purpose of the present invention is:

[0006] A crankshaft oil hole angle auxiliary detection rod, the detection rod is a cylindrical straight rod, the detection rod is composed of two sections of measuring rod one and measuring rod two with different diameters, the center lines of measuring rod one and measuring rod two are on a straight line, the diameter of measuring rod one is larger than that of measuring rod two, and scale lines A and scale lines B are provided on the circumference of measuring rod one; the diameter of measuring rod two is 0.02-0.05mm smaller than the diameter of the oil hole to be measured, and the length of measuring rod two is larger than half of the depth of the oil hole to be measured.

[0007] Furthermore, the distance L between the scale line A and the scale line B is set to 20 to 80 mm, which is an integer value.

[0008] Furthermore, the length of the measuring rod 1 is 8 to 12 mm longer than the distance between the scale line A and the scale line B.

[0009] Furthermore, the diameter of the measuring rod 1 is set to be 4 to 10 mm larger than that of the measuring rod 2, which is an even number.

[0010] Furthermore, the width of the scale line A and the scale line B is 0.1 to 0.3 mm, and the depth is 0.1 to 0.3 mm.

[0011] A method for inspecting the angle of a crankshaft oil hole, comprising the above-mentioned auxiliary inspection rod for the angle of the crankshaft oil hole, the inspection method comprising the following steps:

[0012] Place the crankshaft on the inspection platform, support the two farthest main journals with a height-adjustable V-shaped frame, and adjust the main shaft center axis to be horizontal;

[0013] Insert the second measuring rod into the oil hole to be measured, and simulate the center line of the oil hole to be enlarged and extended;

[0014] Rotate the crankshaft connecting rod neck according to the theoretical size height, and rotate the center of the oil hole to be measured to the theoretical horizontal position;

[0015] Detect the height difference Δ between the scale lines A and B on the circumference of the oil hole inspection rod, which are separated by a distance L, to determine whether the oil hole angle is within the allowable angle tolerance range:

[0016] When the heights of scale lines A and B are the same, the actual angle of the measured oil hole is consistent with the theoretical angle; if the deviation value of the measured oil hole angle α is δ, then the maximum height difference Δ between scale lines A and B = LSinδ. If the height difference between scale lines A and B is ≤LSinδ, the actual angle of the measured oil hole is within the allowable angle tolerance range and is qualified; if the height difference between scale lines A and B is greater than Lsinδ, the actual angle of the measured oil hole exceeds the angle tolerance range and is unqualified.

[0017] The advantages of the present invention are: it provides a simple auxiliary inspection rod for inspecting the angle of the crankshaft oil hole relative to the center plane of the journal and an oil hole angle inspection method. The auxiliary inspection rod has a simple structure and is easy to process. The two scale lines at a certain distance from each other imply the ingenuity of the use method. At the same time, the platform inspection method for the angle of the crankshaft oil hole relative to the center plane of the journal provided by the present invention is simple to operate, practical and easy to promote. It is applicable to the inspection of the angle of all crankshaft oil holes relative to the center plane of the journal, and can also be used in the early stage of product development or during mass production. Compared with special inspection devices, the present invention has the characteristics of low cost and strong versatility, and can quickly determine whether the actual angle of the measured oil hole is within the angle tolerance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the test rod in the embodiment;

[0019] Figure 2 A schematic diagram of placing a crankshaft on a platform V-shaped frame and adjusting the central axis of the main shaft to a horizontal position in an embodiment;

[0020] Figure 3 It is a schematic diagram of adjusting the center of the connecting rod neck corresponding to the center line of the measured oil hole to a horizontal position in the embodiment;

[0021] Figure 4 It is a schematic diagram of measuring the height difference between scale lines A and B when the outer circle of the connecting rod is adjusted to the height H4 and the measured oil hole is at the theoretical level in the embodiment.

[0022] In the figure, 1. Measuring rod one 2. Measuring rod two 3. End surface of measuring rod one 4. End surface of measuring rod two 5. Scale line A 6. Scale line B 7. V-shaped frame 8. First main journal 9. Second main journal 10. Measured oil hole 11. Plate 12. Vernier caliper. DETAILED DESCRIPTION

[0023] The content of the present invention is further described below in conjunction with the embodiments and drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example:

[0025] like Figure 1 As shown, an auxiliary inspection rod for crankshaft oil hole angle, the inspection rod is a cylindrical straight rod, the inspection rod is composed of two sections, a measuring rod 1 and a measuring rod 2, with different diameters, the center lines of the measuring rod 1 and the measuring rod 2 are in a straight line, the diameter of the measuring rod 1 is larger than the measuring rod 2, and scale lines A5 and B6 are provided on the circumference of the measuring rod 1; the diameter of the measuring rod 2 is 0.02-0.05mm smaller than the diameter of the oil hole to be measured, and the length of the measuring rod 2 is greater than half of the depth of the oil hole to be measured.

[0026] Furthermore, the distance L between the scale line A 5 and the scale line B 6 is set to 20 to 80 mm, which is an integer value.

[0027] Furthermore, the length of the measuring rod 1 is 8 to 12 mm longer than the distance between the scale line A 5 and the scale line B 6.

[0028] Furthermore, the diameter of the measuring rod 1 is set to be 4 to 10 mm larger than that of the measuring rod 2, which is an even number.

[0029] Furthermore, the width of the scale line A 5 and the scale line B 6 is 0.1 to 0.3 mm, and the depth is 0.1 to 0.3 mm.

[0030] A method for inspecting the angle of a crankshaft oil hole, comprising the above-mentioned auxiliary inspection rod for the angle of the crankshaft oil hole, the inspection method comprising the following steps:

[0031] Place the crankshaft on the inspection platform 11, support the two farthest main journals, the first main journal 8 and the second main journal 9, with a height-adjustable V-shaped frame 7, and adjust the main shaft center axis to be horizontal;

[0032] Insert the measuring rod 2 into the oil hole 10 to be measured, and simulate the center line of the oil hole to be enlarged and extended;

[0033] Rotate the crankshaft connecting rod neck according to the theoretical size height, and rotate the center of the oil hole 10 to be measured to the theoretical horizontal position;

[0034] Detect the height difference Δ between the scale lines A 5 and B 6 on the circumference of the test rod, which are separated by a distance L, to determine whether the angle of the oil hole being tested is within the allowable angle tolerance range:

[0035] When the heights of scale lines A5 and B6 are the same, the actual angle of the measured oil hole 9 is consistent with the theoretical angle; if the deviation value of the measured oil hole angle α is δ, then the maximum height difference Δ=LSinδ between scale lines A5 and B6, and if the height difference between scale lines A5 and B6 is ≤LSinδ, the actual angle of the measured oil hole is within the allowable angle tolerance range and is qualified; if the height difference between scale lines A5 and B6 is greater than Lsinδ, the actual angle of the measured oil hole 10 exceeds the angle tolerance range and is unqualified.

[0036] When the diameter of the oil hole 10 to be measured is Ø5mm, the depth is 95mm, the oil hole angle is 30°, and the oil hole angle tolerance δ to be measured is ±0.5°:

[0037] In order to facilitate insertion into the oil hole to be tested and to fully contact the surrounding hole walls in the oil hole to be tested, the diameter of the auxiliary test rod measuring rod 2 is Ø4.97mm, which is 0.03mm smaller than the diameter of the oil hole 10 to be tested; the length of measuring rod 2 is 60mm, which is greater than half of the oil hole depth of 95mm; the diameter of the test rod measuring rod 1 is Ø14mm, which is an even number larger than measuring rod 2; measuring rod 1 and measuring rod 2 are connected and transitioned by a small fillet or right angle with a radius R of 0.5mm, and the surface roughness can be around Ra0.6. The first end face 3 of the measuring rod and the second end face 4 of the measuring rod are chamfered with a width of 0.5mm and an angle of 45° to remove burrs; the distance L between the scale line A5 and the scale line B6 is 40mm, so the length of the measuring rod 1 is 50mm, which is about 10mm longer than the distance L between the scale lines A and B; a scale line A5 with a width of 0.2mm and a depth of 0.2mm is engraved on the circumference 35mm away from the first end face of the measuring rod; another scale line B6 with a width of 0.2mm and a depth of 0.2mm is engraved 40mm to the right of the scale line A5, so that a Ø5mm oil hole angle auxiliary inspection rod is obtained.

[0038] The invention discloses an oil hole angle inspection method for an auxiliary inspection rod for inspecting the angle of a crankshaft oil hole relative to a journal centerline on a platform, comprising the following steps:

[0039] 1. Place the two main journals farthest from each other at both ends of the crankshaft, the first main journal 8 (main journals 1 and 5 for four-cylinder engines) and the second main journal 9 (main journals 1 and 7 for six-cylinder engines) on a V-shaped frame 7 with adjustable height; use a height vernier caliper 12 with a dial indicator to detect the highest point of the outer circle of the first main journal 8 and the second main journal 9, and adjust the height of the adjustable V-shaped frame 7 so that the highest points of the outer circles of the first main journal 8 and the second main journal 9 are at the same height, and the central axis of the main journal is parallel to the plate 11, as shown in FIG. Figure 2 As shown; record the dial indicator reading H1, then the distance from the crankshaft center axis to the plate 11 is H = H1-D / 2, where D is the outer diameter of the main journal;

[0040] 2. According to the angle size of the oil hole of the main journal to be tested, adjust the connecting rod center to a horizontal position according to the theoretical height H2 of the outer circle of the connecting rod neck, such as Figure 3 As shown, record the H2 dimension, H2=H+d / 2, where d is the outer diameter of the connecting rod neck, and H is the distance from the crankshaft center axis to the plate 11;

[0041] 3. Insert the oil hole angle auxiliary test rod 2 of suitable size into the oil hole 10 to be tested. It is better to insert the test rod into the oil hole to be tested without looseness. Rotate the outer circle of the crankshaft connecting rod neck to the theoretical height H4 according to the theoretical horizontal position of the oil hole to be tested. Figure 4As shown, H4 = H2 + Esinα, where α is the angle of the inclined oil hole, and E is the distance from the center of the connecting rod neck to the center of the main journal, such as Figure 2 As shown;

[0042] 4. Use a height vernier caliper 12 with a micrometer to measure the height difference Δ at the auxiliary test rod scale line A 5 and scale line B 6. If the distance between the test rod scale line A 5 and scale line B 6 is 40mm, and the angle deviation value δ of the measured oil hole is ±0.5゜, it is qualified when the height difference Δ≤LSinδ. In this case, Δ≤40×Sin(0.5), and the oil hole angle is qualified.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for inspecting the angle of a crankshaft oil hole, characterized in that: It comprises an auxiliary inspection rod for the crankshaft oil hole angle, the inspection rod is a cylindrical straight rod, the inspection rod is composed of two sections, a measuring rod 1 and a measuring rod 2, with different diameters, the center lines of the measuring rod 1 and the measuring rod 2 are in a straight line, the diameter of the measuring rod 1 is larger than that of the measuring rod 2, and scale lines A and B are provided on the circumference of the measuring rod 1; the diameter of the measuring rod 2 is 0.02-0.05mm smaller than the diameter of the oil hole to be measured, and the length of the measuring rod 2 is greater than half of the depth of the oil hole to be measured; The inspection method comprises the following steps: Place the crankshaft on the inspection platform, support the two farthest main journals with a height-adjustable V-shaped frame, and adjust the main shaft center axis to be horizontal; Insert the second measuring rod into the oil hole to be measured, and simulate the center line of the oil hole to be enlarged and extended; Rotate the crankshaft connecting rod neck according to the theoretical size height, and rotate the center of the oil hole to be measured to the theoretical horizontal position; Detect the height difference Δ between the scale lines A and B on the circumference of the oil hole inspection rod, which are separated by a distance L, to determine whether the oil hole angle is within the allowable angle tolerance range: When the heights of scale lines A and B are the same, the actual angle of the measured oil hole is consistent with the theoretical angle; if the angle deviation value of the measured oil hole is δ, then the maximum height difference Δ between scale lines A and B = LSinδ. If the height difference between scale lines A and B is ≤LSinδ, the actual angle of the measured oil hole is within the allowable angle tolerance range and is qualified; if the height difference between scale lines A and B is greater than Lsinδ, the actual angle of the measured oil hole exceeds the angle tolerance range and is unqualified.

2. The crankshaft oil hole angle inspection method according to claim 1, characterized in that: The distance L between the scale line A and the scale line B is set to 20 to 80 mm, taking an integer value.

3. The crankshaft oil hole angle inspection method according to claim 1, characterized in that: The length of measuring rod 1 is 8 to 12 mm longer than the distance between scale line A and scale line B.

4. The crankshaft oil hole angle inspection method according to claim 1, characterized in that: The diameter of measuring rod one is set to be 4 to 10 mm larger than that of measuring rod two, which is an even number.

5. The crankshaft oil hole angle inspection method according to claim 1, characterized in that: The width of scale lines A and B is 0.1 to 0.3 mm, and the depth is 0.1 to 0.3 mm.

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