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. According to the utility model, the angular and axial positioning devices of the crankshaft and the shading baffle plate are utilized, so that the laser marking positioning can be realized, the function of checking the installation angle of the crankshaft timing gear is realized, and the detection of the accuracy of the installation position of the crankshaft timing gear in mass production can be better met; 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 utility model relates to the technical field of automobile parts manufacturing, and particularly relates to a positioning error prevention and laser marking device for detecting the installation of a crankshaft timing gear. Background Technique

[0002] A timing gear is installed at the flange end of the engine crankshaft. The function of the crankshaft timing gear is to ensure the valve timing during the operation of the engine, so that the opening and closing of the intake and exhaust valves are consistent with the piston movement phase. Usually, there are marks on the crankshaft timing gear. During assembly, it is necessary to use the installation fixture of the crankshaft timing gear to ensure the accuracy of the installation position of the crankshaft timing gear. After the installation of the crankshaft timing gear is completed, the installation of the camshaft gear needs to be carried out in the subsequent process. When installing the camshaft gear, the marked teeth of the camshaft gear must correspond to the marked teeth of the crankshaft timing gear. However, due to the limitation of the assembly space, when assembling the engine camshaft gear, the marked teeth of the crankshaft timing gear cannot be well exposed in the operator's field of vision, but the outer circle of the adjacent crankshaft flange can be easily observed. For practical considerations, a laser timing mark needs to be made at the position on the outer circle of the crankshaft flange corresponding to the marked teeth of the timing gear to guide the assembly personnel to carry out the installation and positioning of the crankshaft camshaft gear.

[0003] The laser timing mark on the outer circle of the crankshaft flange has strict position requirements: in the circumferential direction, it needs to be consistent with the position of the marked teeth of the timing gear to play the role of a positioning reference; in the axial direction, it needs to be controlled outside the oil seal assembly area of the outer circle of the flange, otherwise it cannot be exposed and observed.

[0004] In summary, it is becoming increasingly important to design a positioning error prevention and laser marking device for detecting the installation of a crankshaft timing gear to meet the mass production of crankshafts. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the invention purpose of the utility model is to provide a positioning error prevention and laser marking device for detecting the installation of a crankshaft timing gear, so as to conveniently and quickly detect the installation position of the crankshaft timing gear and print a laser mark on the crankshaft flange for the subsequent installation and positioning of the crankshaft camshaft gear.

[0006] To achieve the above-mentioned invention object, the positioning error prevention and laser marking device of the present utility model includes a horizontal support device, a laser marking device, 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; in the direction of the timing gear near the light-shielding baffle, there is a structure of an error prevention boss; the laser scanning lens of the laser marking device emits laser through the through window of the light-shielding baffle and acts on the outer circle surface of the flange to mark a marking pattern, and the marking pattern is an equilateral triangle. The included angle between the line connecting the center of the marking tooth on the timing gear and the crankshaft axis and the line connecting the center of the connecting rod journal and the crankshaft axis is α. The included angle between the line connecting the center of the marking pattern and the crankshaft axis and the line connecting the center of the connecting rod journal and the crankshaft axis is α. The center of the marking 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. Above the bracket, two parallel channel steel rails are fixedly connected by bolts. The cylinder seat, two V-shaped supports, the angular positioning block, and the axial positioning block are installed on the channel steel rails through inner hexagon bolts and square head nuts. A cylinder and a push rod are connected to the cylinder seat installed on the right side of the bracket.

[0008] Further, the V-shaped supports are used to support the two end main journals of the crankshaft. The first cushion block is installed on the upper plane of the V-shaped support by countersunk head bolts, and the second cushion block is installed on the V-shaped groove of the V-shaped support by countersunk head bolts. The first cushion block and the second cushion block 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 cushion block is installed on the positioning surface of the angular positioning block by countersunk head bolts. The third cushion block is made of polyurethane material, and the height of the third cushion block is the same as the height of the lowest point on the journal surface after the connecting rod journal rotates clockwise by α angle from the vertical upward direction.

[0010] Further, the axial positioning block is located on the left side of the bracket. The end face of the axial positioning block is connected to the end face of the flange in contact with the fourth cushion block by bolts. The fourth cushion block is made of polyurethane material.

[0011] Further, a flange hole is drilled on the flange. The included angle between the line connecting the center of the flange hole and the crankshaft axis and the line connecting the marking tooth 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 larger than the outer diameter of the flange. The distance between the two inner end faces of the light-shielding baffle is greater than the thickness of the flange. A through hole is opened at the position of β angle clockwise along the center of the flange on the end face of the light-shielding baffle. The inner diameter and the center circle diameter of the through hole are the same as the inner diameter and the center circle diameter of the flange hole. The plug pin is composed of a smooth pin with an outer diameter smaller than the inner diameter of the flange hole connected to a handle. The light-shielding baffle is stuck on the flange, and the plug pin is inserted into the flange hole through the through hole on the light-shielding baffle.

[0012] Further, at a distance L from its outer wall of the light-shielding baffle, a laser passing window is opened along the direction from the symmetric center of the light-shielding baffle to the side of the positive timing gear. The laser passing window is a square through-hole. The length of the laser passing window is adapted to the angular coverage range of the identification pattern, and the width is adapted to the axial coverage range of the identification pattern. A laser positioning reference line is engraved at the symmetric center of the light-shielding baffle. The laser positioning reference line is perpendicular to the left border of the laser passing window, and they jointly form a laser positioning horizontal and vertical reference.

[0013] Further, the width of the anti-misalignment boss is greater than the tooth width of one positive timing gear. The center line of the anti-misalignment boss is offset by half of the helix angle of the positive timing gear relative to the symmetric center of the light-shielding baffle. θ , and a chamfer is provided at the bottom of the anti-misalignment boss to fit the chamfer of the end face of the marking tooth.

[0014] Compared with the prior art, in the present utility model, the light-shielding baffle is clamped on the flange. After completing the positioning anti-misalignment and the assembly of the laser marking device, when the positive timing gear on the crankshaft is correctly installed, the anti-misalignment boss is aligned with the chamfer on the marking tooth; otherwise, the anti-misalignment boss is lifted by other non-marking teeth (without chamfer structure), resulting in abnormal installation, and thus the accuracy of the installation position of the positive timing gear can be effectively detected. Then, adjust the position of the laser scanning lens, turn on the red light positioning of the laser marking device, so that the red positioning point emitted by the laser scanning lens is at the intersection of the laser positioning reference line and the left border of the laser passing window, that is, the laser positioning between the laser scanning lens and the crankshaft is completed. At this time, start the marking function of the laser marking device. The laser scanning lens emits laser, and the laser passes through the laser passing window on the light-shielding baffle and acts on the outer circumferential surface of the flange to mark the identification pattern, so as to facilitate guiding the subsequent assembly of the engine camshaft gear. The present utility model utilizes the angular and axial positioning devices of the crankshaft and the light-shielding baffle, which can be used for the positioning of laser marking and also has the function of verifying the installation angle of the crankshaft positive timing gear, and can better meet the detection of the accuracy of the installation position of the crankshaft positive timing gear in mass production, as well as marking the laser identification for guiding the assembly personnel to install and position the crankshaft camshaft gear. It has the advantages of low cost, simple operation, stable and efficient. Brief Description of the Drawings

[0015] Figure 1 is a structural schematic diagram of the present utility model.

[0016] Figure 2 is Figure 1 the A-A cross-sectional view of

[0017] Figure 3 is Figure 1 the B-B cross-sectional view of

[0018] Figure 4 is Figure 1 the left view of

[0019] Figure 5 is Figure 1 the Q-direction view of

[0020] Figure 6 is Figure 5 the V-direction view of

[0021] Figure 7 is Figure 5 the C-C cross-sectional view of

[0022] In the figure: 1. Laser scanning lens; 2. Bracket; 3. Channel steel guide rail; 4. Cylinder block; 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. Spacer block 1; 13. Spacer block 2; 14. Spacer block 3; 15. Marking tooth; 16. Spacer block 4; 17. Light-shielding baffle; 18. Pin; 19. Anti-misalignment boss; 20. Laser positioning reference line; 21. Laser passing window; 22. Flange hole; 23. Identification pattern; 24. Crankshaft; 25. Chamfer; 26. Through hole. Specific embodiments

[0023] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown, the positioning anti-misalignment and laser marking device of the present utility model mainly includes a horizontal support device, a laser marking device and a light-shielding baffle 17. The horizontal support device mainly consists of a cylinder block 4, two V-shaped supports 6, an angular positioning block 7 and an axial positioning block 11. In the direction of the timing gear 9 close to the light-shielding baffle 17, a structure of an anti-misalignment boss 19 is provided for detecting the accuracy of the installation position of the crankshaft timing gear. The laser scanning lens 1 of the laser marking device emits laser through the passing window 21 of the light-shielding baffle 17 and acts on the outer circle surface of the flange 10 to mark the identification pattern 23 for the subsequent installation and positioning of the crankshaft camshaft gear. The identification pattern 23 is an equilateral triangle. The angle between the line connecting the center of the marking tooth 15 on the timing gear 9 and the axis of the crankshaft 24 and the line connecting the center of the connecting rod journal 8 and the axis of the crankshaft 24 is α. The angle between the line connecting the center of the identification pattern 23 and the axis of the crankshaft 24 and the line connecting the center of the connecting rod journal 8 and the axis of the crankshaft 24 is α. The center of the identification pattern 23 and the center of the marking 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. Above the bracket 2, two parallel channel steel rails 3 are fixedly connected 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 rail 3 through hexagon socket head cap screws and square head nuts. A cylinder and a push rod 5 are connected to the cylinder seat 4 installed on the right side of the bracket 2. Before the crankshaft 24 is clamped, the cylinder is in a loose state, and the push rod 5 retracts to the Figure 1 solid line position shown. The use of the channel steel rail 3 structure is beneficial to the axial adjustment of each component, enabling the horizontal support device to adapt to the processing of different types of crankshafts 24.

[0025] The V-shaped support 6 is used to support the two end main journals of the crankshaft 24. The first cushion block 12 is installed on the upper plane of the V-shaped support 6 by countersunk head bolts, and the second cushion block 13 is installed on the V-shaped groove of the V-shaped support 6 by countersunk head bolts. The first cushion block 12 and the second cushion block 13 are made of polyurethane material, which has a protective effect on the surface of the crankshaft 24. The crankshaft 24 is placed on the V-shaped support 6 in a horizontal state.

[0026] The angular positioning block 7 is installed at the position of the connecting rod journal 8 of the crankshaft 24. The third cushion block 14 is installed on the positioning surface of the angular positioning block 7 by countersunk head bolts. The third cushion block 14 is made of polyurethane material, which is beneficial to protecting the surface of the connecting rod journal 8. During use, the crankshaft 24 is manually rotated until the connecting rod journal 8 contacts the third cushion block 14. By calculation, the height of the third cushion block 14 is made consistent with the height of the lowest point on the journal surface after the connecting rod journal 8 rotates clockwise by an angle α from the vertical upward direction, and thus 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 face of the axial positioning block 11 is connected by bolts, and the fourth cushion block 16 contacts the end face of the flange 10. The fourth cushion block 16 is made of polyurethane material. When the crankshaft 24 is placed horizontally and angularly positioned, the cylinder is manually pressed tightly. The cylinder pushes the push rod 5 to move to the left. When the push rod 5 contacts the crankshaft 24, the crankshaft 24 displaces to the left under the thrust until the end face of the flange 10 is in close contact with the fourth cushion block 16, and thus the axial positioning of the crankshaft 24 is completed.

[0028] A flange hole 22 is drilled on the flange 10. The included angle between the connecting line of the center of the flange hole 22 and the axis of the crankshaft 24 and the connecting line of the marking tooth 15 and the axis of the crankshaft 24 is β. The light-shielding baffle 17 of the laser marking device is of a sector shell-like structure. The inner diameter of the light-shielding baffle 17 is larger than the outer diameter of the flange 10. The distance between the two inner end faces of the light-shielding baffle 17 is larger than the thickness of the flange 10. A through hole 26 is opened at the end face of the light-shielding baffle 17 at an angle of β clockwise along the center of the flange 10. The inner diameter and the center circle diameter of the through hole 26 are the same as those of the flange hole 22. The plug pin 18 is a smooth pin with an outer diameter smaller than the inner diameter of the flange hole 22 and is connected to a handle. When in use, the light-shielding baffle 17 is clamped on the flange 10, and the plug pin 18 is inserted into the flange hole 22 through the through hole 26 on the light-shielding baffle 17, thus completing the positioning error prevention and the assembly of the laser marking device.

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

[0030] In the direction of the timing gear 9 on the light-shielding baffle 17, a structure of an anti-error boss 19 is provided. The width of the anti-error boss 9 is slightly larger than the tooth width of a timing gear 9. The center line of the anti-error boss 19 is offset by half of the helix angle of the timing gear 9 relative to the symmetric center of the light-shielding baffle 17 θ , and a chamfer 25 that fits the chamfer of the end face of the marking tooth 15 is provided at the bottom edge of the anti-error boss 19. The anti-error boss 9 coincides with the center line of the left end face of the marking tooth 15, and the center lines of the cross-sections of the light-shielding baffle 17, the flange 10, the marking pattern 23, and the marking tooth 15 coincide.

[0031] Anti - error principle for the installation angle of the timing gear 9 in the present invention: The light - shielding baffle 17 is clamped on the flange 10, and the pin 18 is inserted through the through - hole 26 on the light - shielding baffle 17 into the flange hole 22, thus completing the assembly of the positioning anti - error and laser marking device. There is a marked tooth 15 on the timing gear 9, and there is a chamfered notch on the end face of this marked tooth 15 as a mark, while the other non - marked teeth do not have this chamfer structure. Utilizing this feature, in the direction of the timing gear 9 on the light - shielding baffle 17, a structure of an anti - error boss 19 is added. The width of this anti - error boss 19 is slightly larger than the tooth width of a timing gear 9, and its center line is offset by half of the helix angle of the timing gear 9 relative to the symmetry center of the light - shielding baffle 17. A chamfer 25 is made at the bottom edge to fit the chamfer on the end face of the marked tooth 15. When the timing gear 9 on the crankshaft 24 is installed correctly, the anti - error boss 19 will be aligned with the chamfer on the marked tooth 15; conversely, if the timing gear 9 on the crankshaft 24 is installed with misaligned teeth, the anti - error boss 19 will be lifted by other non - marked teeth (without chamfer structure), resulting in abnormal installation. This positioning anti - error device can effectively detect the accuracy of the installation position of the timing gear 9.

[0032] After the light - shielding baffle 17 is installed on the flange 10, adjust the position of the laser scanning lens 1, turn on the red - light positioning of the laser marking device, 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 - hand frame of the laser passing window 21, thus completing the laser positioning between the laser scanning lens 1 and the crankshaft 24. At this time, start the marking function of the laser marking device. The laser scanning lens 1 emits laser, and the laser passes through the laser passing window 21 on the light - shielding baffle 17 and acts on the outer - circle surface of the flange 10 to mark the marking pattern 23. Thus, a complete marking operation is completed. The circumferential direction of this marking pattern 23 is consistent with the position of the center point of the marked tooth 15 of the timing gear 9, and the axial direction is outside the outer - circle oil - seal assembly area of the flange 10. When assembling the engine camshaft gear, it is not restricted by the assembly space, so that the angular position of the marked tooth 15 of the crankshaft timing gear 9, that is, the marking pattern 23, is well exposed in the field of vision of the operator. There are two "parallel lines" - shaped marks engraved at the corresponding position on the camshaft gear to the marked tooth 15 of the timing gear 9 on the crankshaft 24. During assembly, the operator adjusts the angle of the camshaft gear to align the two "parallel lines" - shaped marks on the camshaft gear with the marking pattern 23 on the outer - circle of the flange 10 on the crankshaft 24.

Claims

1. A positioning error prevention and laser marking device for detecting the installation of a crankshaft timing gear, characterized in that: The positioning error prevention and laser marking device comprises a horizontal support device, a laser marking device 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 provided on the light shielding baffle (17) in a direction close to the timing gear (9); a laser scanning lens (1) of the laser marking device emits laser light through a through window (21) of the light shielding baffle (17), acts on the outer cylindrical surface of the flange (10), and marks a marking pattern According to the embodiment (23), the identification pattern (23) is an equilateral triangle, the line connecting the center of the marking tooth (15) on the timing gear (9) and the axis of the crankshaft (24) forms an angle α with respect to the line connecting the center of the connecting rod journal (8) and the axis of the crankshaft (24), the line connecting the center of the marking pattern (23) and the axis of the crankshaft (24) forms an angle α with respect to the line connecting the center of the connecting rod journal (8) 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 positioning error prevention and laser marking device for detecting the installation of the crankshaft timing gear according to claim 1 is characterized in that: The bottom of the horizontal support device is supported by a bracket (2) formed by welding square steel pipes. Two parallel channel steel guide rails (3) are fixedly connected by bolts above the bracket (2). The 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 hexagon socket bolts and square head nuts. The cylinder seat (4) installed on the right side of the bracket (2) is connected to a cylinder and a push rod (5).

3. The positioning error prevention and laser marking device for detecting the installation of the crankshaft timing gear according to claim 1 is characterized in that: The V-shaped support (6) is used to support the main journals at both ends of the crankshaft (24); the first pad (12) is installed on the upper plane of the V-shaped support (6) by countersunk bolts; the second pad (13) is installed on the V-shaped groove of the V-shaped support (6) by countersunk bolts; the first pad (12) and the second pad (13) are made of polyurethane material.

4. The positioning error prevention and laser marking device for detecting the installation of the crankshaft timing gear according to claim 1 is characterized in that: The angular positioning block (7) is mounted on the connecting rod journal (8) of the crankshaft (24); the spacer block (14) is mounted on the positioning surface of the angular positioning block (7) by means of a countersunk bolt; the spacer block (14) is made of a polyurethane material; the height of the spacer block (14) is 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 vertical upward.

5. The positioning error prevention and laser marking device for detecting 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 bracket (2), and the end surface of the axial positioning block (11) is in contact with the end surface of the flange (10) by using a bolt-connected pad block four (16), and the pad block four (16) is made of polyurethane material.

6. The positioning error prevention and laser marking device for detecting 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 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 shading baffle (17) is a fan-shaped shell structure, the inner circle diameter of the shading baffle (17) is larger than the outer circle diameter of the flange (10), the distance between the two end surfaces inside the shading baffle (17) is larger than the thickness of the flange (10), and the shading baffle (17) is provided with a plurality of flanges. The end surface of the flange (10) is provided with a through hole (26) at a clockwise angle β in the center thereof. 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 latch (18) is a smooth pin having an outer diameter smaller than the inner diameter of the flange hole (22) connected to a handle. The light shielding baffle (17) is clamped on the flange (10). The latch (18) is inserted into the flange hole (22) through the through hole (26) on the light shielding baffle (17).

7. The positioning error prevention and laser marking device for detecting the installation of the crankshaft timing gear according to claim 1, characterized in that: A laser passing window (21) is provided at a distance L from the outer wall of the light shielding baffle (17) and along the symmetry center of the light shielding baffle (17) in a direction toward one side of the timing gear (9). The laser passing window (21) is a square through hole. The length of the laser passing window (21) is adapted to the angular coverage of the identification pattern (23), and the width is adapted to the axial coverage of the identification pattern (23). A laser positioning reference line (20) is engraved at the symmetry center of the light shielding baffle (17). The laser positioning reference line (20) and the left frame of the laser passing window (21) are perpendicular to each other and together constitute a laser positioning horizontal and vertical reference.

8. The positioning error prevention and laser marking device for detecting the installation of the crankshaft timing gear according to claim 1, characterized in that: The width of the anti-error boss (19) is greater than the tooth width of a timing gear (9), and the center line of the anti-error boss (19) is offset from the symmetric center of the light shielding baffle (17) by half the helical angle of the timing gear (9). θ The bottom edge of the anti-error boss (19) is provided with a chamfer (25) that fits the chamfer of the end face of the marking tooth (15).

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