A jig for hydraulic tensioner production line

Abstract

This utility model discloses a fixture for hydraulic tensioner production line manufacturing. A positioning cylinder is provided on the slide table of the production line. The positioning cylinder includes a cylinder positioning cylinder column and a piston positioning cylinder column, which are arranged side-by-side on the slide table. The cylinder workpiece is placed vertically into the cylinder positioning cylinder column, and the piston workpiece is inserted head-down into the piston positioning cylinder column. The upper sides of the positioning cylinder extend upwards to form tile-shaped positioning side plates, and an upward-opening U-shaped side opening is formed between the two positioning side plates. The lines connecting the two U-shaped side openings on different positioning cylinders intersect. This fixture adopts an independent positioning cylinder design for the cylinder and piston, achieving three-dimensional space optimization through a vertical height difference layout. Combined with the opposite-direction U-shaped opening structure of the tile-shaped side plates, it allows robotic arms or operators to simultaneously pick up and place workpieces from different directions, avoiding the interference problem of traditional unidirectional fixtures and improving space utilization by 35%.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic tensioner manufacturing technology, specifically to a fixture for hydraulic tensioner assembly line production. Background Technology

[0002] Hydraulic tensioners are critical components used to maintain stable tension in transmission systems (such as engine timing chains and belts), and their production requires extremely high precision and reliability. In assembly line production, fixtures are core auxiliary equipment for ensuring efficient and standardized manufacturing.

[0003] like Figure 1 The image shows a hydraulic tensioner, which includes components such as a tie rod, cylinder, piston, push rod, spring, and support. During assembly line production, it requires processing at several stations, such as cylinder cleaning, tie rod installation, oil injection, piston installation, spring installation, and support installation. During assembly line assembly, some stations use robotic arms for gripping operations, and it is also necessary to maintain good positioning of the workpiece as it moves on the assembly line to facilitate pick-and-place operations.

[0004] In view of the above, it is necessary to propose a fixture for the production line of hydraulic tensioners to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the defects in the existing technology and provide a fixture for the production line of hydraulic tensioners.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A fixture for hydraulic tensioner production line, wherein a positioning cylinder is provided on the slide of the production line, the positioning cylinder including a cylinder positioning cylinder column and a piston positioning cylinder column, the two positioning cylinders being arranged side by side on the slide, the cylinder workpiece being placed in the cylinder positioning cylinder column in a vertical insertion manner, and the piston workpiece being inserted into the piston positioning cylinder column in an inverted manner with its head inserted; the upper two sides of the positioning cylinder extend upward to form tile-shaped positioning side plates, and a U-shaped side opening is formed between the two positioning side plates, the connecting lines between the two U-shaped side openings on different positioning cylinders intersecting each other.

[0007] Furthermore, the cylinder positioning cylinder is positioned higher than the piston positioning cylinder, and the lower two sides of the cylinder positioning cylinder are provided with elongated holes, the line connecting the two elongated holes being perpendicular to the line connecting the U-shaped side openings.

[0008] Furthermore, the lines connecting the U-shaped side openings of the two positioning cylinders are perpendicular to each other.

[0009] Furthermore, the inner wall of the positioning side plate of the cylinder positioning cylinder column is provided with several strip-shaped protrusions, so that the outer wall of the cylinder workpiece and the positioning side plate form a linear contact.

[0010] Furthermore, the strip-shaped protrusions extend vertically or are arranged around the periphery in a spiral direction.

[0011] Furthermore, multiple convex rollers are evenly distributed within the strip-shaped convex ridge, and the highest point of the convex roller's wheel surface is slightly higher than the upper surface of the strip-shaped convex ridge, so that a multi-point supporting rolling contact is formed between the outer surface of the cylinder body and the positioning side plate.

[0012] Furthermore, the inner wall of the piston positioning cylinder is provided with an expansion clamping part, which expands to form a contour and clamps and fixes the head of the piston workpiece.

[0013] Furthermore, the expansion clamping part includes an expansion cavity, and the internal chamber of the expansion cavity is connected to a compressed air source.

[0014] The advantages and beneficial effects of this utility model are as follows: 1. The fixture for hydraulic tensioner production line adopts an independent positioning cylinder design for the cylinder body and piston. The vertical height difference layout achieves three-dimensional space optimization. Combined with the U-shaped opening structure of the tile-shaped side plate, the robotic arm or operator can simultaneously pick up and place workpieces from different directions, avoiding the interference problem of traditional unidirectional fixtures, and improving space utilization by 35%.

[0015] 2. The cylinder positioning cylinder innovatively adopts a combination of vertical / spiral strip-shaped convex ribs and embedded roller components, upgrading the workpiece contact mode to a "line contact + rolling friction" composite structure. Actual measurements show an 82% reduction in surface wear rate, making it particularly suitable for applications requiring cylinder surface protection while maintaining good positioning accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a hydraulic tensioner production line according to the present invention;

[0017] Figure 2 It is a 3D view of the hydraulic tensioner being processed;

[0018] Figure 3 This is a front view of the hydraulic tensioner being machined;

[0019] Figure 4 This is one of the structural schematic diagrams of a fixture for hydraulic tensioner production line according to this utility model;

[0020] Figure 5 This is one of the schematic diagrams of a jig with strip-shaped protrusions for hydraulic tensioner production line according to this utility model;

[0021] Figure 6 This is the second schematic diagram of a fixture with strip-shaped protrusions for hydraulic tensioner production line according to this utility model;

[0022] Figure 7 This is the third schematic diagram of a fixture with strip-shaped protrusions for hydraulic tensioner production line according to this utility model;

[0023] Figure 8 This is a schematic diagram of the expansion clamping part in a fixture used in the production line of hydraulic tensioners according to this utility model;

[0024] In the diagram: 1. Slide table; 2. Positioning cylinder; 3. Cylinder positioning cylinder column; 4. Piston positioning cylinder column; 5. Cylinder workpiece; 6. Piston workpiece; 7. Head; 8. Positioning side plate; 9. U-shaped side opening; 10. Long waist hole; 11. Strip-shaped protrusion; 12. Protrusion roller; 13. Expansion clamping part; 14. Expansion chamber; 15. Gas; 16. Tie rod; 17. Spring; 18. Support; 19. Columnar cylinder; 20. Annular protrusion; 21. Cleaning and loading station; 22. Oil injection and sealing installation station; 23. Piston assembly and loading station; 24. Pressure holding and testing station; 25. Spring installation station; 26. Support installation station; 27. Unloading station. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0026] A fixture for hydraulic tensioner production line manufacturing, such as Figure 1 As shown, this device can be applied to the circular conveyor line shown in the figure. Several fixtures for hydraulic tensioner workpieces are arranged on the conveyor line. When the circular conveyor line is running, each fixture moves.

[0027] The fixture includes a slide 1 at the bottom, on which a positioning cylinder 2 is mounted. During movement, the slide 1 is driven by a conveyor line to move along the assembly line, and the positioning cylinder 2 positions the cylinder workpiece 5. Figure 2 , 3As shown, the hydraulic tensioner assembled on the assembly line includes a cylinder body 5, a piston 6, a tie rod 16, a spring 17, and a support 18. The lower part of the cylinder body 5 is a cylindrical cylinder 19, and the tie rod 16 is installed on the lower part of the cylindrical cylinder 19. The lower part of the tie rod 16 is connected to the support 18. An annular convex edge 20 is formed on the upper outer periphery of the cylindrical cylinder 19. A preloaded spring 17 is installed between the annular convex edge 20 and the support 18. The piston 6 is installed on the upper part of the cylinder body 5, and the head 7 of the piston 6 is exposed. In the actual assembly process of the annular conveyor assembly line, the assembly line is equipped with a cylinder body cleaning and loading station 21, an oil injection station 22, a seal installation station, a piston assembly and loading station, a pressure holding and testing station, a spring 17 installation station, a support 18 installation station, and a loading station.

[0028] In this fixture, the positioning cylinder 2 includes a cylinder positioning cylinder 2 column and a piston positioning cylinder 2 column. The two positioning cylinders 2 are arranged side by side on the slide table 1. At the cleaning and loading station 21, the cleaned and dried cylinder workpiece 5 is placed on the running water at this station. Specifically, the cylinder workpiece 5 is placed in the cylinder positioning cylinder 2 column in a vertical insertion manner. Figure 1 As shown, at this time, the cylindrical cylinder 19 of the cylinder workpiece 5 is inserted into the cylinder positioning cylinder 2, and the annular protrusion 20 provided on the upper edge of the cylinder workpiece 5 is stuck at the upper end of the cylinder positioning cylinder 2 to form a height position. As the production line moves, the workpiece is moved to the oil injection 22 and seal installation station. When it stops at this station, the seal and oil injection 22 are installed inside the cylinder workpiece 5. Then it enters the subsequent piston assembly and loading station. At this station, the assembled cylinder workpiece 5 is placed into the piston positioning cylinder 2 of this fixture, and at this time, the piston workpiece 6 is inserted into the piston positioning cylinder 2 in an inverted manner with its head 7 inserted into the piston positioning cylinder 2. The loading of the piston workpiece 6 is completed at this station.

[0029] The upper two sides of the positioning cylinder 2 extend upward to form tile-shaped positioning side plates 8, such as... Figure 4 As shown, an upward-opening U-shaped side opening 9 is formed between the two positioning side plates 8. This side opening facilitates manual or mechanical lifting of the workpiece from the fixture via the U-shaped side opening 9. Furthermore, to save space, the two positioning cylinders 2 are positioned relatively close together. To facilitate the removal of workpieces from the two positioning cylinders 2 without interference, in this embodiment, the lines connecting the two U-shaped side openings 9 on different positioning cylinders 2 are arranged to intersect; preferably... Figure 4 , 5 As shown, the lines connecting the U-shaped side openings 9 of the two positioning cylinders 2 are perpendicular to each other; thus, workpieces can be gripped from different directions.

[0030] Furthermore, the cylinder positioning cylinder 2 is positioned higher than the piston positioning cylinder 2. Since the annular convex edge 20 of the cylinder workpiece 5 is located high and its lower part is relatively long, the cylinder positioning cylinder 2 is set to a height sufficient to accommodate the workpiece in order to provide sufficient height space. The height difference between the cylinder positioning cylinder 2 and the piston positioning cylinder 2 also effectively avoids interference when handling the workpiece. The lower part of the cylinder positioning cylinder 2 has elongated holes 10 on both sides, and the line connecting the two elongated holes 10 is perpendicular to the line connecting the U-shaped side openings 9.

[0031] As an improvement, the inner wall of the positioning side plate 8 of the cylinder positioning cylinder 2 column is provided with several strip-shaped protrusions 11, so that the outer wall of the cylinder workpiece 5 and the positioning side plate 8 form a linear contact. In the aforementioned embodiment, a tile-shaped positioning side plate 8 structure is adopted. When the workpiece is placed in, the columnar cylinder 19 and the positioning side plate 8 are in surface-fitting contact. The large contact area may cause jamming when placing and taking out, which may cause abnormal wear on the surface of the columnar cylinder 19 and affect product quality.

[0032] As one example, such as Figure 5 As shown, the strip-shaped protrusions extend vertically and surround the inner wall of the positioning cylinder 2, forming a protrusion of a certain height. When the workpiece 5 is placed in the cylinder, the strip-shaped protrusions contact the cylindrical cylinder 19, thereby reducing the contact area and facilitating the workpiece placement and removal. Alternatively, the strip-shaped protrusions can be arranged spirally, such as... Figure 6 As shown.

[0033] The strip-shaped convex ridges are evenly spaced with multiple convex rollers 12, such as... Figure 7 As shown, the highest point of the convex roller 12 is slightly higher than the upper surface of the strip-shaped convex ridge, creating a multi-point supporting rolling contact between the outer surface of the cylinder body and the positioning side plate 8. By having the convex roller 12 contact the surface of the cylindrical cylinder 19, the sliding friction between the strip-shaped convex ridge and the cylinder surface is changed to rolling friction, thereby avoiding damage to the workpiece surface.

[0034] Furthermore, the inner wall of the piston positioning cylinder 2 is provided with an expansion clamping part 13. During the assembly process of the workpiece, after the piston workpiece 6 is loaded and moved to the pressure holding test station, the cylinder workpiece 5 and the piston workpiece 6 are assembled. Then, it needs to be installed in the piston positioning cylinder 2 with the bottom of the cylinder workpiece 5 facing upward, so as to facilitate the sequential assembly of the spring 17 and the support 18 onto the workpiece. Since the cylinder workpiece 5 and the piston workpiece 6 are inverted and inserted into the piston positioning cylinder 2 through the head 7 of the cylinder workpiece 5 after assembly, a large part of its upper part is exposed. In order to securely position it, the expansion clamping part 13 expands to form a contour and clamps and fixes the head 7 of the piston workpiece 6.

[0035] Furthermore, the expansion clamping part 13 includes an expansion cavity, such as... Figure 8 As shown, the internal chamber of the expansion cavity is connected to a compressed air source. In actual use, the expansion cavity can be made of silicone or rubber material. It is set on the inner wall of the piston positioning cylinder 2 to form a sealed expansion chamber 14. Gas 15 is injected into it through the connected pipeline, so that it expands and deforms to fit the workpiece being positioned, forming a clamping and fixing. It can be understood that before the workpiece is put in, the gas 15 inside the expansion chamber 14 can be evacuated to make it contract, so that the workpiece is easier to put in. After the workpiece is put in, gas 15 is then introduced to expand and fix it.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fixture for production line manufacturing of hydraulic tensioners, characterized in that, A positioning cylinder (2) is provided on the slide (1) of the production line. The positioning cylinder (2) includes a cylinder positioning cylinder (2) column and a piston positioning cylinder (2) column. The two positioning cylinders (2) are arranged side by side on the slide (1). The cylinder workpiece (5) is placed in the cylinder positioning cylinder (2) column in a vertical insertion manner. The piston workpiece (6) is inserted into the piston positioning cylinder (2) column in an inverted manner with its head (7) inserted. The upper two sides of the positioning cylinder (2) extend upward to form tile-shaped positioning side plates (8). A U-shaped side opening (9) is formed between the two positioning side plates (8). The connecting lines between the two U-shaped side openings (9) on different positioning cylinders (2) intersect.

2. A fixture for hydraulic tensioner production line manufacturing according to claim 1, characterized in that, The cylinder positioning cylinder (2) is positioned higher than the piston positioning cylinder (2). The lower part of the cylinder positioning cylinder (2) is provided with long waist holes (10) on both sides. The line connecting the two long waist holes (10) is perpendicular to the line connecting its U-shaped side opening (9).

3. A fixture for hydraulic tensioner production line manufacturing according to claim 1, characterized in that, The lines connecting the U-shaped side openings (9) of the two positioning cylinders (2) are perpendicular to each other.

4. A fixture for hydraulic tensioner production line manufacturing according to claim 1, characterized in that, The inner wall of the positioning side plate (8) of the cylinder positioning cylinder (2) column is provided with several strip-shaped protrusions (11), so that the outer wall of the cylinder workpiece (5) and the positioning side plate (8) form a linear contact.

5. A fixture for hydraulic tensioner production line manufacturing according to claim 4, characterized in that, The strip-shaped protrusions extend vertically or are arranged spirally.

6. A fixture for hydraulic tensioner production line manufacturing according to claim 5, characterized in that, Multiple convex rollers (12) are evenly distributed within the strip-shaped convex ridge. The highest point of the convex roller (12) is slightly higher than the upper surface of the strip-shaped convex ridge, so that the outer surface of the cylinder body and the positioning side plate (8) form a multi-point support rolling contact.

7. A fixture for hydraulic tensioner production line manufacturing according to claim 1, characterized in that, The inner wall of the piston positioning cylinder (2) is provided with an expansion clamping part (13), which expands to form a contour and clamps and fixes the head (7) of the piston workpiece (6).

8. A fixture for hydraulic tensioner production line manufacturing according to claim 7, characterized in that, The expansion clamping part (13) includes an expansion cavity, and the internal chamber of the expansion cavity is connected to a compressed air source.

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