Positioning mistake-proofing and laser marking device for detecting installation of crankshaft timing gear

Abstract

A positioning mistake-proofing and laser marking device for detecting crankshaft timing gear installation is used in the field of automobile part manufacturing. The horizontal supporting device is composed of an air cylinder base, two V-shaped supports, an angular positioning block and an axial positioning block. A mistake-proof boss structure is arranged on the shading baffle in the direction close to the timing gear; the laser scanning lens penetrates through the passing window of the shading baffle to emit laser, the laser acts on the surface of the outer circle of the flange, an identification pattern is marked, the identification pattern is an equilateral triangle, and the center of the identification pattern and the center of a mark tooth on the timing gear are located at the same angular position. The device can be used for positioning a laser mark by utilizing the angular and axial positioning devices of the crankshaft and the shading baffle, also has a function of checking the installation angle of the crankshaft timing gear, can better meet the detection of the accuracy of the installation position of the crankshaft timing gear in mass production, and improves the production efficiency. And laser marks for guiding assembling personnel to mount and position the crankshaft and camshaft gear are marked, so that the cost is low, the operation is simple, and the efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts manufacturing, and particularly relates to a positioning error-proofing and laser marking device for detecting installation of a crankshaft timing gear. BACKGROUND

[0002] An engine crankshaft flange end is provided with a timing gear, and the crankshaft timing gear functions to ensure a valve timing during engine operation, so that opening and closing of intake and exhaust valves is consistent with a piston movement phase. Usually, a mark is punched on the crankshaft timing gear, and during assembly, an installation fixture of the crankshaft timing gear is used to ensure accuracy of an installation position of the crankshaft timing gear. After the crankshaft timing gear is installed, a camshaft gear is installed in a subsequent process. During installation of the camshaft gear, a mark tooth of the camshaft gear must correspond to a mark tooth of the crankshaft timing gear. However, due to a limitation of assembly space, the mark tooth of the crankshaft timing gear cannot be well exposed in a field of view of an operator during assembly of the camshaft gear of the engine, but an outer circle of the crankshaft flange adjacent to the mark tooth of the crankshaft timing gear can be easily observed. In order to consider actual operation, a laser timing mark corresponding to the mark tooth of the crankshaft timing gear is needed to be marked on the outer circle of the crankshaft flange, and is used to guide an operator to install and position the camshaft gear of the crankshaft.

[0003] The laser timing mark on the outer circle of the crankshaft flange has strict position requirements. In a circumferential direction, the laser timing mark needs to be consistent with the mark tooth of the timing gear, and functions as a positioning reference. In an axial direction, the laser timing mark needs to be controlled outside an oil seal assembly area of the outer circle of the flange, otherwise the laser timing mark cannot be exposed and observed.

[0004] In summary, it is more and more important to design the positioning error-proofing and laser marking device for detecting installation of the crankshaft timing gear in order to meet mass production of the crankshaft. SUMMARY

[0005] In order to overcome the deficiencies of the prior art, the present application aims to provide the positioning error-proofing and laser marking device for detecting installation of the crankshaft timing gear, so as to conveniently and quickly detect the installation position of the crankshaft timing gear, and print the laser mark on the crankshaft flange, which is used for installation and positioning of the camshaft gear of the crankshaft.

[0006] To achieve the above-mentioned purposes, the positioning error-proofing and laser marking device comprises a horizontal support device, a laser marking equipment and a light shielding baffle; the horizontal support device is composed of a cylinder seat, two V-shaped supports, an angular positioning block and an axial positioning block; an error-proofing boss structure is arranged on the light shielding baffle near the direction of the timing gear; the laser scanning lens of the laser marking equipment emits laser through the passing window of the light shielding baffle and acts on the outer surface of the flange to mark the identification pattern; the identification pattern is an equilateral triangle; the center line of the timing gear and the crankshaft axis forms an angle α with the center line of the connecting rod journal and the crankshaft axis; the center line of the identification pattern and the crankshaft axis forms an angle α with the center line of the connecting rod journal and the crankshaft axis; the center of the identification pattern and the center of the marking tooth on the timing gear are located at the same angular position.

[0007] Further, the bottom of the horizontal support device is supported by a bracket welded by square steel pipes; two parallel channel steel guide rails are fixed on the bracket by bolts; the cylinder seat, the two V-shaped supports, the angular positioning block and the axial positioning block are installed on the channel steel guide rails by hexagon bolts and square nuts; the cylinder seat on the right side of the bracket is connected with a cylinder and a push rod.

[0008] Further, the V-shaped supports are used to support the two end main journals of the crankshaft; the first pad is installed on the upper plane of the V-shaped support by a countersunk bolt; the second pad is installed on the V-shaped groove of the V-shaped support by a countersunk bolt; the first pad and the second pad are made of polyurethane material.

[0009] Further, the angular positioning block is installed at the position of the connecting rod journal of the crankshaft; the third pad is installed on the positioning surface of the angular positioning block by a countersunk bolt; the third pad is made of polyurethane material; the height of the third pad is consistent with the height of the lowest point of the journal surface after the journal is rotated clockwise by an angle α from the vertical direction.

[0010] Further, the axial positioning block is located on the left side of the bracket; the end surface of the axial positioning block is connected with the fourth pad by a bolt, and the end surface of the fourth pad contacts the end surface of the flange; the fourth pad is made of polyurethane material.

[0011] Further, the flange is drilled with a flange hole; the angle between the center line of the flange hole and the connecting line of the marking tooth and the crankshaft axis and the angle between the center line of the connecting rod journal and the crankshaft axis is β; the light shielding baffle is a fan-shaped shell structure; the inner diameter of the light shielding baffle is greater than the outer diameter of the flange; the distance between the two end surfaces of the light shielding baffle is greater than the thickness of the flange; a through hole is opened on the end surface of the light shielding baffle along the center of the flange by β angle clockwise; the inner diameter and the center circle diameter of the through hole are consistent with the inner diameter and the center circle diameter of the flange hole; the plug is a smooth pin with an outer diameter smaller than the inner diameter of the flange hole connected with a handle; the light shielding baffle is clamped on the flange, and the plug is inserted into the flange hole through the through hole on the light shielding baffle.

[0012] Furthermore, at a distance L from the outer wall of the light-shielding baffle, a laser-passing window is opened along the symmetry center of the light-shielding baffle towards the timing gear side. The laser-passing window is a square through hole. The length of the laser-passing window is adapted to the angular coverage of the marking pattern, and the width is adapted to the axial coverage of the marking pattern. A laser positioning reference line is engraved at the symmetry center of the light-shielding baffle. The laser positioning reference line is perpendicular to the left frame of the laser-passing window and together they form the horizontal and vertical laser positioning references.

[0013] Furthermore, the width of the anti-misalignment boss is greater than the tooth width of a timing gear, and the centerline of the anti-misalignment boss is offset from the center of symmetry of the light-shielding baffle by half the helix angle of the timing gear. θ The bottom edge of the anti-error boss is chamfered to match the chamfer on the end face of the marking tooth.

[0014] Compared with existing technologies, this invention uses a light-shielding baffle to secure the flange. After assembling the positioning and anti-misalignment device and the laser marking device, when the timing gear on the crankshaft is correctly installed, the anti-misalignment boss aligns with the chamfer on the marking tooth. Conversely, if the anti-misalignment boss is pushed up by other non-marking teeth (without chamfered structures), it cannot be installed correctly, thus effectively detecting the accuracy of the timing gear installation position. The position of the laser scanning lens is then adjusted, and the red light positioning of the laser marking device is activated, ensuring that the red positioning point emitted by the laser scanning lens is at the intersection of the laser positioning baseline and the left edge of the laser transmission window. This completes the laser positioning between the laser scanning lens and the crankshaft. At this point, the marking function of the laser marking device is activated. The laser scanning lens emits a laser beam, which passes through the laser transmission window on the light-shielding baffle and acts on the outer surface of the flange, marking a pattern to guide the subsequent assembly of the engine camshaft gear. This invention utilizes angular and axial positioning devices for the crankshaft, along with a light-shielding baffle, for both laser marking and crankshaft timing gear installation angle verification. This better meets the requirements for accurate crankshaft timing gear installation position testing during mass production, and also provides laser marking to guide assembly personnel in positioning crankshaft and camshaft gears. It boasts advantages such as low cost, simple operation, and stable and efficient performance. Attached Figure Description

[0015] Figure 1 This is a simplified structural diagram of the present invention.

[0016] Figure 2 for Figure 1 AA sectional view.

[0017] Figure 3 for Figure 1 BB cross-sectional view.

[0018] Figure 4 for Figure 1 The left view.

[0019] Figure 5 Q view. Figure 1

[0020] Figure 6 V view. Figure 5

[0021] C-C sectional view. Figure 7 Figure 5

[0022] In the figure: 1, laser scanning lens; 2, bracket; 3, channel steel guide rail; 4, cylinder seat; 5, push rod; 6, V-shaped support; 7, angular positioning block; 8, connecting rod journal; 9, timing gear; 10, flange; 11, axial positioning block; 12, cushion block one; 13, cushion block two; 14, cushion block three; 15, mark tooth; 16, cushion block four; 17, light shielding baffle; 18, bolt; 19, error-proof boss; 20, laser positioning reference line; 21, laser passing window; 22, flange hole; 23, identification pattern; 24, crankshaft; 25, chamfer; 26, through hole. DETAILED DESCRIPTION

[0023] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The positioning error-proof and laser marking device of the present application mainly comprises a horizontal support device, a laser marking equipment and a light shielding baffle 17. The horizontal support device mainly consists of a cylinder seat 4, two V-shaped supports 6, an angular positioning block 7 and an axial positioning block 11. On the light shielding baffle 17, close to the direction of the timing gear 9, there is a structure of an error-proof boss 19, which is used for detecting the accuracy of the installation position of the timing gear of the crankshaft. The laser scanning lens 1 of the laser marking equipment emits laser through the passing window 21 of the light shielding baffle 17, which acts on the outer circular surface of the flange 10 to mark the identification pattern 23, which is used for the subsequent installation and positioning of the camshaft gear of the crankshaft. The identification pattern 23 is an equilateral triangle. The center line of the mark tooth 15 on the timing gear 9 and the center line of the crankshaft 24 form an α angle with the center line of the connecting rod journal 8 and the center line of the crankshaft 24. The center line of the identification pattern 23 and the center line of the crankshaft 24 form an α angle with the center line of the connecting rod journal 8 and the center line of the crankshaft 24. The center of the identification pattern 23 and the center of the mark tooth 15 on the timing gear 9 are located at the same angular position.

[0024] ​​​The bottom of the horizontal support device is supported by a bracket 2 welded by square steel pipes, and two parallel channel steel guide rails 3 are fixedly connected above the bracket 2 by bolts. A cylinder seat 4, two V-shaped supports 6, an angular positioning block 7 and an axial positioning block 11 are installed on the channel steel guide rails 3 by means of inner hexagonal bolts and square nuts. A cylinder and a push rod 5 are connected to the cylinder seat 4 on the right side of the bracket 2. Before the crankshaft 24 is clamped, the cylinder is in a loosened state, and the push rod 5 is withdrawn to the position shown by the solid line. Figure 1 The structure of the channel steel guide rails 3 is beneficial to the axial adjustment of the components, so that the horizontal support device can adapt to the machining of different types of crankshafts 24.

[0025] The V-shaped supports 6 are used to support the two end main journal of the crankshaft 24. A cushion block one 12 is installed on the upper plane of the V-shaped support 6 by means of a countersunk bolt, and a cushion block two 13 is installed on the V-shaped groove of the V-shaped support 6 by means of a countersunk bolt. The cushion block one 12 and the cushion block two 13 are made of polyurethane material and have a protective effect on the surface of the crankshaft 24. The crankshaft 24 is placed horizontally on the V-shaped support 6.

[0026] The angular positioning block 7 is installed at the position of the connecting rod journal 8 of the crankshaft 24. A cushion block three 14 is installed on the positioning surface of the angular positioning block 7 by means of a countersunk bolt. The cushion block three 14 is made of polyurethane material and is beneficial to the protection of the surface of the connecting rod journal 8. In use, the crankshaft 24 is manually rotated until the connecting rod journal 8 contacts the cushion block three 14. Through calculation, the height of the cushion block three 14 is made consistent with the height of the lowest point on the surface of the connecting rod journal 8 after the connecting rod journal 8 is rotated clockwise by an angle α from the vertical upward. From this, the angular positioning of the crankshaft 24 is completed.

[0027] The axial positioning block 11 is located on the left side of the bracket 2. The end surface of the axial positioning block 11 is connected to the end surface of the flange 10 by means of a bolt, and the end surface of the flange 10 is in contact with a cushion block four 16 made of polyurethane material. After the crankshaft 24 is placed horizontally and angularly positioned, the cylinder is manually compressed, the cylinder pushes the push rod 5 to move to the left side, and when the push rod 5 contacts the crankshaft 24, the crankshaft 24 is displaced to the left side under the action of the pushing force until the end surface of the flange 10 is tightly attached to the cushion block four 16. From this, the axial positioning of the crankshaft 24 is completed.

[0028] A flange hole 22 is drilled on the flange 10. The angle between the line connecting the center of the flange hole 22 and the axis of the crankshaft 24 and the line connecting the marking tooth 15 and the axis of the crankshaft 24 is β. The light shield 17 of the laser marking device is a fan-shaped shell structure. The inner diameter of the light shield 17 is larger than the outer diameter of the flange 10. The distance between the two inner end faces of the light shield 17 is greater than the thickness of the flange 10. A through hole 26 is opened at the end face of the light shield 17 at a clockwise angle β from the center of the flange 10. The inner diameter and central circle diameter of the through hole 26 are the same as the inner diameter and central circle diameter of the flange hole 22. The pin 18 is a smooth pin with an outer diameter smaller than the inner diameter of the flange hole 22 connected to a handle. In use, the light shield 17 is clipped onto the flange 10, and the pin 18 is inserted into the flange hole 22 through the through hole 26 on the light shield 17, thus completing the positioning and error prevention and assembly of the laser marking device.

[0029] At a distance L from the outer wall of the light-shielding baffle 17, a laser passage window 21 is opened along the center of symmetry of the light-shielding baffle 17 towards the side of the timing gear 9. The laser passage window 21 is a square through hole. The length of the laser passage window 21 matches the coverage range of the angular direction of the marking pattern 23, and the width matches the coverage range of the axial direction of the marking pattern 23. A laser positioning reference line 20 is engraved at the center of symmetry of the light-shielding baffle 17. The laser positioning reference line 20 is perpendicular to the left frame of the laser passage window 21, and together they form the horizontal and vertical references for laser positioning.

[0030] On the light-shielding baffle 17, near the timing gear 9, there is a misalignment prevention boss 19. The width of the misalignment prevention boss 9 is slightly larger than the tooth width of a timing gear 9. The centerline of the misalignment prevention boss 19 is offset from the center of symmetry of the light-shielding baffle 17 by half the helix angle of the timing gear 9. θ The bottom edge of the anti-mistake protrusion 19 is provided with a chamfer 25 that fits into the chamfer of the end face of the marking tooth 15. The anti-mistake protrusion 9 coincides with the center line of the left end face of the marking tooth 15, and the light shield 17, flange 10, and marking pattern 23 coincide with the center line of the center section of the marking tooth 15.

[0031] The error-proofing principle for the installation angle of the timing gear 9 in this invention is as follows: The light-shielding baffle 17 is clipped onto the flange 10, and the pin 18 is inserted into the flange hole 22 through the through hole 26 on the light-shielding baffle 17, thus completing the assembly of the positioning error-proofing and laser marking device. The timing gear 9 has a marking tooth 15 with a chamfered notch on its end face as a mark. Other non-marking teeth do not have this chamfered structure. Utilizing this feature, an error-proofing protrusion 19 is added to the light-shielding baffle 17 near the timing gear 9. The width of this error-proofing protrusion 19 is slightly larger than the tooth width of a timing gear 9, and its centerline is offset from the center of symmetry of the light-shielding baffle 17 by half the helix angle of the timing gear 9. A chamfer 25 is made on the bottom edge to fit the chamfer on the end face of the marking tooth 15. When the timing gear 9 on the crankshaft 24 is installed correctly, the anti-misalignment boss 19 will align with the chamfer on the marking tooth 15; conversely, if the timing gear 9 on the crankshaft 24 is installed with the wrong tooth, the anti-misalignment boss 19 will be pushed up by other non-marking teeth (without chamfer structure), making normal installation impossible. This positioning and anti-misalignment device can effectively detect the accuracy of the timing gear 9's installation position.

[0032] After the light-shielding baffle 17 is installed on the flange 10, adjust the position of the laser scanning lens 1 and turn on the red light positioning of the laser marking equipment so that the red positioning point emitted by the laser scanning lens 1 is at the intersection of the laser positioning reference line 20 and the left edge of the laser transmission window 21. This completes the laser positioning between the laser scanning lens 1 and the crankshaft 24. At this time, the marking function of the laser marking equipment is activated. The laser scanning lens 1 emits a laser, which passes through the laser transmission window 21 on the light-shielding baffle 17 and acts on the outer circular surface of the flange 10, marking the marking pattern 23. This completes one marking operation. The circumferential direction of the marking pattern 23 is consistent with the center point of the marking tooth 15 of the timing gear 9, and the axial direction is outside the outer circular oil seal assembly area of ​​the flange 10. This allows for assembly of the engine camshaft gear without being restricted by the assembly space, ensuring that the angular position of the marking tooth 15 of the crankshaft timing gear 9, i.e., the marking pattern 23, is well exposed in the operator's field of vision. The camshaft gear has two parallel lines engraved on the corresponding position of the marking tooth 15 of the timing gear 9 of the crankshaft 24. During assembly, the operator adjusts the angle of the camshaft gear to align the two parallel lines on the camshaft gear with the marking pattern 23 on the outer circle of the flange 10 on the crankshaft 24.

Claims

1. A device for detecting the positioning error proofing and laser marking of a crankshaft timing gear installation, characterized by: The positioning error prevention and laser marking device comprises a horizontal support device, a laser marking equipment and a light shielding baffle (17); the horizontal support device is composed of a cylinder seat (4), two V-shaped supports (6), an angular positioning block (7) and an axial positioning block (11); a structure of an error prevention boss (19) is arranged on the light shielding baffle (17) near the direction of the timing gear (9); a laser scanning lens (1) of the laser marking equipment emits laser through a passing window (21) of the light shielding baffle (17) and acts on the outer surface of the flange (10) to mark a marking pattern (23); the marking pattern (23) is an equilateral triangle; the center line of the marking pattern (23) and the axis of the crankshaft (24) is at an angle α with respect to the center line of the center of the marking tooth (15) on the timing gear (9) and the axis of the crankshaft (24); the center line of the marking pattern (23) and the axis of the crankshaft (24) is at an angle α with respect to the center line of the center of the marking tooth (15) on the timing gear (9) and the axis of the crankshaft (24); and the center of the marking pattern (23) and the center of the marking tooth (15) on the timing gear (9) are located at the same angular position.

2. The detection of the positioning mistake proofing and laser marking device of the installation of the crankshaft timing gear according to claim 1, characterized in that: The bottom of the horizontal support device is a support (2) welded by square steel pipes, two parallel channel steel guide rails (3) are fixed and connected on the support (2) by bolts, the cylinder seat (4), the two V-shaped supports (6), the angular positioning block (7) and the axial positioning block (11) are installed on the channel steel guide rails (3) by inner hexagonal bolts and square nuts, and the cylinder seat (4) installed on the right side of the support (2) is connected with a cylinder and a push rod (5).

3. The detection of the positioning mistake proofing and laser marking device of the installation of the crankshaft timing gear according to claim 1, characterized in that: The V-shaped supports (6) are used for supporting the two end main shaft necks of the crankshaft (24), a cushion block one (12) is installed on the upper plane of the V-shaped support (6) by a countersunk bolt, and a cushion block two (13) is installed on the V-shaped groove of the V-shaped support (6) by a countersunk bolt, and the cushion block one (12) and the cushion block two (13) are made of polyurethane material.

4. The detection of the positioning mistake proofing and laser marking device of the installation of the crankshaft timing gear according to claim 1, characterized in that: The angular positioning block (7) is installed at the position of the connecting rod shaft neck (8) of the crankshaft (24), a cushion block three (14) is installed on the positioning surface of the angular positioning block (7) by a countersunk bolt, the cushion block three (14) is made of polyurethane material, and the height of the cushion block three (14) is consistent with the height of the lowest point of the shaft neck surface of the connecting rod shaft neck (8) after rotating α degrees clockwise from the vertical direction.

5. The detection of the positioning mistake proofing and laser marking device of the installation of the crankshaft timing gear according to claim 1, characterized in that: The axial positioning block (11) is located on the left side of the support (2), the end surface of the axial positioning block (11) is connected with a cushion block four (16) by bolts, and the end surface of the flange (10) is in contact with the cushion block four (16), and the cushion block four (16) is made of polyurethane material.

6. The detection of the positioning mistake proofing and laser marking device of the installation of the crankshaft timing gear according to claim 1, characterized in that: The flange (10) is drilled with a flange hole (22), the center line of the flange hole (22) and the angle between the connecting line of the crankshaft (24) axis and the mark tooth (15) and the connecting line of the crankshaft (24) axis is β, the light shielding baffle (17) is a fan-shaped shell structure, the inner diameter of the light shielding baffle (17) is greater than the outer diameter of the flange (10), the distance between the two end faces of the light shielding baffle (17) is greater than the thickness of the flange (10), a through hole (26) is opened at the end face of the light shielding baffle (17) along the center of the flange (10) clockwise by β angle, the inner diameter and the center circle diameter of the through hole (26) are consistent with the inner diameter and the center circle diameter of the flange hole (22), the plug (18) is a smooth pin with an outer diameter smaller than the inner diameter of the flange hole (22) connected with a handle, the light shielding baffle (17) is clamped on the flange (10), and the plug (18) is inserted into the flange hole (22) through the through hole (26) on the light shielding baffle (17).

7. The detection of the positioning mistake proofing and laser marking device of the installation of the crankshaft timing gear according to claim 1, characterized in that: At a distance L of the light shielding baffle (17) from the outer wall, a laser passing window (21) is opened along the center of symmetry of the light shielding baffle (17) to the direction of the positive gear (9) side, the laser passing window (21) is a square through hole, the length of the laser passing window (21) is adapted to the coverage range of the mark pattern (23) in the angular direction, and the width is adapted to the coverage range of the mark pattern (23) in the axial direction, a laser positioning reference line (20) is engraved at the center of symmetry of the light shielding baffle (17), the laser positioning reference line (20) is perpendicular to the left frame of the laser passing window (21), and together they form a laser positioning horizontal and vertical reference.

8. The mispositioning prevention and laser marking device for detecting the installation of a crankshaft timing gear according to claim 1, characterized in that: The width of the error-proof boss (19) is greater than the tooth width of a timing gear (9), and the center line of the error-proof boss (19) is offset from the center of symmetry of the light shielding baffle (17) by one half of the helix angle of the timing gear (9) ​ The bottom edge of the error-proof boss (19) is provided with a chamfer (25) which is fitted with the chamfer of the end face of the mark tooth (15).

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