Press fitting equipment for piston steel cable baffle ring

Abstract

The invention relates to the technical field of piston assembly, in particular to press fitting equipment for a piston steel cable baffle ring. The wedge-shaped contractor and the elastic pusher are used in cooperation to achieve the ring collecting effect, the steel wire check ring enters an inner hole of the wedge-shaped contractor, the elastic pusher pushes the steel wire check ring to move downwards in the downward moving process, and the steel wire check ring gradually shrinks after entering a middle taper hole till the steel wire check ring is pushed into a bottom straight hole, does not shrink any more and only moves downwards. And the elastic pusher is pushed into the check ring hole of the piston. By means of the cooperation of the elastic pusher and the wedge-shaped contractor, positioning and rapid ring contraction of the steel cable check ring are achieved, the steel cable check ring can be accurately and efficiently pressed into grooves in the two sides of a piston pin hole, the assembling efficiency and quality are improved, and the small-batch assembling requirement is met.

Description

Technical Field

[0001] This application relates to the field of piston assembly technology, and in particular to a piston wire retainer press-fitting device. Background Technology

[0002] When assembling engine pistons, the wire retaining rings are usually installed into the slots at both ends of the piston pin hole using a screwdriver and manual methods. Due to the irregular shape of the retaining rings, a large tightening force is required during assembly, making assembly difficult and easily scratching the piston. When assembling small batches, the assembly efficiency is low. Summary of the Invention

[0003] This application provides a piston wire retainer ring pressing device, which can quickly, efficiently and easily press the wire retainer ring into the grooves on both sides of the piston pin hole, improving assembly efficiency and quality, and is especially suitable for small batch assembly needs.

[0004] The piston wire retaining ring pressing equipment provided in this application includes a frame, an elastic pusher, a wedge-shaped retractor, a reset mechanism, and a pressing mechanism; The frame includes a base and a support plate erected on the base; the base is provided with a mounting position for placing the piston. The reset mechanism is disposed on the base and includes a limiting pressure plate; the limiting pressure plate is disposed above the mounting position; the limiting pressure plate is capable of rebounding after the downward pressure is removed; The wedge-shaped retractor is disposed on the limiting pressure plate; the wedge-shaped retractor has a top straight hole with a larger diameter and a bottom straight hole with a smaller diameter, as well as a central tapered hole connecting the top straight hole and the bottom straight hole; a flat notch is provided on one side of the top straight hole for the steel wire retaining ring to enter; the bottom straight hole of the wedge-shaped retractor is aligned with the mounting position; The pressing mechanism is disposed on the support plate, the pressing mechanism is connected to the elastic pusher, and the pressing mechanism can drive the elastic pusher to move up and down in the vertical direction; The lower end of the elastic pusher can be inserted into the top straight hole of the wedge-shaped contractor.

[0005] In a preferred embodiment, the reset mechanism further includes a guide limiting post and a spring; At least two of the guide limiting posts are respectively disposed on the base; the two ends of the limiting pressure plate are respectively provided with sliding sleeves, and are slidably connected to each of the guide limiting posts through the sliding sleeves; the upper end of the spring abuts against the limiting pressure plate, and the lower end abuts against the base; A limiting block is provided at the top of the guide limiting post.

[0006] In a preferred embodiment, a driven bushing fixed to the support plate is further included, and a driven shaft is disposed inside the driven bushing; The upper end of the driven shaft is connected to the pressing mechanism, and the lower end is connected to the elastic pusher.

[0007] In a preferred embodiment, the pressing mechanism includes a handle, a drive chain, and a driven chain; The drive chain is connected to the support plate via a lug, and one end of the drive chain is hinged to the lug; the other end of the drive chain is hinged to one end of the driven chain, and the other end of the driven chain is hinged to the upper end of the driven shaft. The handle is fixedly connected to the drive chain and can drive the drive chain to rotate relative to the lifting lug.

[0008] In a preferred embodiment, an even number of elongated grooves are formed on the outer circular surface of the elastic pusher, which are evenly spaced along the axial direction of the elastic pusher; and a step is provided at the lower end of the elastic pusher for positioning and guiding the steel wire retaining ring.

[0009] In a preferred embodiment, the elastic pusher is made of 65Mn steel.

[0010] In a preferred embodiment, the support plate is provided with a plurality of weight-reducing holes.

[0011] In a preferred embodiment, the inner surface roughness of the top straight hole, the bottom straight hole, and the middle conical hole is Ra3.2μm~Ra0.8μm; the connection between the top straight hole and the middle conical hole, and the connection between the middle conical hole and the bottom straight hole, are all smoothly transitioned by an arc surface.

[0012] In a preferred embodiment, the wedge-shaped shrinkage device is made of 45 steel and is treated with a tempering or quenching process.

[0013] In a preferred embodiment, the diameter of the top straight hole is 1.05 to 1.2 times the initial diameter of the wire retaining ring; the diameter of the bottom straight hole is 0.8 to 0.9 times the initial diameter of the wire retaining ring.

[0014] This application has the following beneficial effects: This application achieves the positioning and rapid retraction of the wire retaining ring through the combined action of the elastic pusher and the wedge-shaped retractor, and can accurately and efficiently press it into the grooves on both sides of the piston pin hole, thereby improving assembly efficiency and quality and meeting the needs of small-batch assembly. Attached Figure Description To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A first-view schematic diagram of the press-fitting equipment for the piston wire retaining ring provided in the embodiments of this application; Figure 2 A second-view schematic diagram of the press-fitting equipment for the piston wire retaining ring provided in the embodiments of this application; Figure 3 for Figure 2 Enlarged schematic diagram of region A in the middle; Figure 4 This is a schematic diagram of a wire retaining ring; Numbering on the map: 1-Handle; 2-Handle base; 3-Drive chain; 4-Driven chain; 5-Driven shaft; 6-Elastic actuator; 7-Wedge-shaped shrinkage device; 701-Notch; 702-Top straight hole; 703-Middle tapered hole; 704-Bottom straight hole; 8-Wire retaining ring; 9-Piston pin; 10-Piston; 11-Connecting rod; 12-Piston support column; 13-Connecting rod support block; 14-Lifting lug; 15-First base plate; 16-Second base plate; 17-Support plate; 18-Bracket plate; 19-Bracket seat; 20-Base; 21-Sliding sleeve; 22-Limiting pressure plate; 23-Guide limiting column; 24-Spring; 25-Driven bushing. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and labeled in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] like Figures 1 to 4 As shown in the figure, this application provides a piston wire retaining ring pressing device, which mainly includes an elastic pusher 6, a wedge-shaped retractor 7, a reset mechanism, a pressing mechanism, and a frame. The frame includes a base 20 and a support plate 18 erected on the base 20; the base 20 is provided with a mounting position for placing the piston; The reset mechanism is located on the base 20 and includes a limiting pressure plate 22; the limiting pressure plate 22 is located above the mounting position; the limiting pressure plate 22 can rebound after the downward pressure is removed; The wedge-shaped shrinkage device 7 is disposed on the limiting pressure plate 22; the wedge-shaped shrinkage device 7 has a top straight hole 702 with a larger diameter and a bottom straight hole 704 with a smaller diameter, as well as a middle tapered hole 703 connecting the top straight hole 702 and the bottom straight hole 704; a flat notch 701 for the steel wire retaining ring 8 to enter is provided on one side of the top straight hole 702; the bottom straight hole 704 of the wedge-shaped shrinkage device 7 is aligned with the mounting position; The pressing mechanism is set on the support plate 18. The pressing mechanism is connected to the elastic pusher 6, and the pressing mechanism can drive the elastic pusher 6 to rise and fall in the vertical direction, so that the lower end of the elastic pusher 6 can be inserted into the top straight hole 702 of the wedge-shaped shrinker 7.

[0024] Specifically, the framework consists of Figure 1 The system comprises a lifting lug 14, a first base plate 15, a second base plate 16, a support plate 17, a bracket plate 18, a bracket base 19, and a base 20, all made of steel. The bracket base 19 is located on one side of the base 20, and the two are positioned by pin holes and connected by bolts. Two bracket plates 18 are erected at intervals on the bracket base 19. The upper end of each bracket plate 18 has the overlapping first base plate 15 and second base plate 16, which are welded together. The first base plate 15 and second base plate 16 are positioned by pin holes and connected by bolts. The lifting lug 14 is welded to the upper end of the first base plate 15, and the support plate 17 is welded to the lower end.

[0025] A cylindrical driven bushing 25 is welded onto the support plate 17. A piston support column 12, which is threadedly connected to the base 20, is provided directly below the driven bushing 25 to form a mounting position. A threaded connecting rod support block 13 is also provided at the other end of the base 20 to support the connecting rod portion of the piston.

[0026] The reset mechanism consists of a sliding sleeve 21, a limiting pressure plate 22, guide limiting posts 23, and a spring 24. The sliding sleeve 21, limiting pressure plate 22, and guide limiting posts 23 are all made of steel, and the spring 24 is made of spring steel. Two guide limiting posts 23 are positioned on either side of the piston support post 12. Their lower ends are threaded onto the base 20, and their upper ends are limiting surfaces. A milled flattening structure is provided at the maximum diameter shaft for easy tightening. Two springs 24 are respectively sleeved on the guide limiting posts 23, serving a reset function. The limiting pressure plate 22 has a central hole for connecting the wedge-shaped retractor 7, and sliding sleeves 21 are provided at both ends. The limiting pressure plate 22 is slidably connected to the two guide limiting posts 23 through the sliding sleeves 21. The upper limiting surface of the guide limiting post 23 can limit the sliding sleeve 21, preventing it from dislodging.

[0027] The pressing mechanism includes a handle 1, a handle seat 2, a drive chain 3, a driven chain 4, and a driven shaft 5, all made of steel. The handle 1 and the handle seat 2 are connected by threads, and the side of the handle seat 2 is fixed to the drive chain 3 by bolts. One end of the drive chain 3 is hinged to the lifting lug 14 by a pin, and the other end is hinged to one end of the driven chain 4 by a pin. The other end of the driven chain 4 is hinged to the upper end of the driven shaft 5. The lower end of the driven shaft 5 passes through the driven shaft sleeve 25 and can slide up and down along the setting direction of the driven shaft sleeve 25.

[0028] The elastic actuator 6 is made of 65Mn steel and has undergone adjustment or quenching processes. The top of the inner hole of the elastic actuator 6 has a threaded hole for easy connection with the bottom stud of the driven shaft 5; six long grooves are evenly opened on the outer surface, and the root of the long grooves has a circular structure to avoid stress concentration; the bottom of the elastic actuator 6 has a small step for positioning and guiding the wire retaining ring 8.

[0029] The wedge-shaped constrictor 7 is made of 45 steel and has undergone adjustment or quenching processes. The wedge-shaped constrictor 7 has a larger diameter top straight hole 702 and a smaller diameter bottom straight hole 704, as well as a central tapered hole 703 connecting the top straight hole 702 and the bottom straight hole 704. The connections between the top straight hole 702 and the central tapered hole 703, and between the central tapered hole 703 and the bottom straight hole 704, are all smoothly transitioned with arc surfaces. The inner surface roughness of the three holes is Ra3.2μm~Ra0.8μm to reduce resistance. The diameter of the top straight hole 702 is slightly larger than the initial diameter of the wire retaining ring 8, for example, it can be 1.05~1.2 times the initial diameter of the wire retaining ring 8; the diameter of the bottom straight hole 704 is slightly smaller than the initial diameter of the wire retaining ring 8 to achieve a contraction effect, for example, it can be 0.8~0.9 times the initial diameter of the wire retaining ring 8.

[0030] The exterior of the wedge-shaped constrictor 7 is a multi-layered stepped shaft. The top two steps have openings 701 on their sides, forming a channel for the wire retaining ring 8 to enter the interior of the wedge-shaped constrictor 7. The third stepped circle is fitted into the central hole of the limiting pressure plate 22 and fixed with screws. The outer diameter of the fourth stepped circle is slightly smaller than the diameter of the piston pin hole of the piston 10, and its height is sufficient to ensure that when the outer circle of the fourth stepped circle just enters the piston pin hole of the piston 10, the lower end face of the outer circle of the third stepped circle does not interfere with the piston 10.

[0031] The wedge-shaped constrictor 7 and the elastic pusher 6 work together to form a loop. The wire retaining ring 8 enters the inner hole of the wedge-shaped constrictor 7 through the notch 701. Since the initial position of the elastic pusher 6 is just higher than the thickness of the wire retaining ring 8, when the wire retaining ring 8 falls into the inner hole, it is basically level with the plane of the notch 701. This ensures that the wire retaining ring 8 is blocked by the bottom of the elastic pusher 6 when it flips, and the upper limit of space prevents the wire retaining ring 8 from reversing. During the downward movement of the elastic pusher 6, the wire retaining ring 8 is pushed downward. After entering the middle conical hole 703, the wire retaining ring 8 gradually contracts until it is pushed into the bottom straight hole 704. It stops contracting and only moves downward. However, at this time, the force of the wire retaining ring 8 sliding downward relative to the wedge-shaped retractor 7 is greater than the force of the wedge-shaped retractor 7 being pushed downward. When the wedge-shaped retractor 7 is pushed to the fourth step circle and just enters the piston pin hole of the piston 10, it is blocked and does not move. The wire retaining ring 8 begins to slide downward relative to the wedge-shaped retractor 7 until it is pushed into the retaining ring hole of the piston 10 by the elastic pusher 6.

[0032] In use, move handle 1 upwards to reset the device, place the piston connecting rod assembly into the device, and allow the piston pin hole to enter the positioning pin of the piston support column 12. Push the wire retaining ring 8 from the notch 701 of the wedge-shaped retractor 7 into the top diameter 702 of the wedge-shaped retractor 7. Move handle 1 downwards, and the driven shaft 5 moves downwards, pushing the wire retaining ring 8 downwards through its head. As the wire retaining ring 8 is gradually pushed from the middle conical hole 703 to the bottom straight hole 704, the force on the wire retaining ring 8 gradually increases. Before the wire retaining ring 8 reaches the bottom straight hole 704, the wire retaining ring 8 and the conical surface of the middle conical hole 703 no longer slide relative to each other. The force is transmitted from the wedge-shaped retractor 7 to the limiting pressure plate 22, and then from the limiting pressure plate 22 to the sliding sleeve 21. The sliding sleeve 21 slides downward relative to the guide limit post 23 until the lower orifice of the wedge-shaped retractor 7 is just inserted into the piston pin hole of the piston 10, at which point the limit plate 22 stops moving. At this time, the wire retaining ring 8 continues to move downward and gradually retracts, allowing the wire retaining ring 8 to enter the bottom straight hole 704. Under the push of the elastic pusher 6, it enters the pin hole groove of the piston 10, completing the pressing of the wire retaining ring 8. Then, the handle 1 is moved upward to reset the equipment.

[0033] In this embodiment, the steel wire retaining ring 8 is positioned and quickly retracted through the combined action of the elastic pusher 6 and the wedge-shaped retractor 7. It can also be accurately and efficiently pressed into the grooves on both sides of the piston pin hole, improving assembly efficiency and quality, and adapting to the needs of small-batch assembly.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A piston wire retaining ring pressing device, characterized in that, Includes a frame, elastic pusher, wedge-shaped retractor, reset mechanism, and press-fitting mechanism; The frame includes a base and a support plate erected on the base; the base is provided with a mounting position for placing the piston. The reset mechanism is disposed on the base and includes a limiting pressure plate; the limiting pressure plate is disposed above the mounting position; the limiting pressure plate is capable of rebounding after the downward pressure is removed; The wedge-shaped retractor is disposed on the limiting pressure plate; the wedge-shaped retractor has a top straight hole with a larger diameter and a bottom straight hole with a smaller diameter, as well as a central tapered hole connecting the top straight hole and the bottom straight hole; a flat notch is provided on one side of the top straight hole for the steel wire retaining ring to enter; the bottom straight hole of the wedge-shaped retractor is aligned with the mounting position; The pressing mechanism is disposed on the support plate, the pressing mechanism is connected to the elastic pusher, and the pressing mechanism can drive the elastic pusher to move up and down in the vertical direction; The lower end of the elastic pusher can be inserted into the top straight hole of the wedge-shaped contractor.

2. The piston wire retaining ring pressing equipment according to claim 1, characterized in that, The reset mechanism also includes a guide limit post and a spring; At least two of the guide limiting posts are respectively disposed on the base; the two ends of the limiting pressure plate are respectively provided with sliding sleeves, and are slidably connected to each of the guide limiting posts through the sliding sleeves; the upper end of the spring abuts against the limiting pressure plate, and the lower end abuts against the base; A limiting block is provided at the top of the guide limiting post.

3. The piston wire retaining ring pressing equipment according to claim 1, characterized in that, It also includes a driven bushing fixed to the support plate, wherein a driven shaft is disposed inside the driven bushing; The upper end of the driven shaft is connected to the pressing mechanism, and the lower end is connected to the elastic pusher.

4. The piston wire retaining ring pressing equipment according to claim 3, characterized in that, The pressing mechanism includes a handle, a drive chain, and a driven chain; The drive chain is connected to the support plate via a lug, and one end of the drive chain is hinged to the lug; the other end of the drive chain is hinged to one end of the driven chain, and the other end of the driven chain is hinged to the upper end of the driven shaft. The handle is fixedly connected to the drive chain and can drive the drive chain to rotate relative to the lifting lug.

5. The piston wire retaining ring pressing equipment according to claim 1, characterized in that, The outer circular surface of the elastic pusher has an even number of long grooves that are evenly spaced along the axial direction of the elastic pusher; the lower end of the elastic pusher is provided with a step for positioning and guiding the steel wire retaining ring.

6. The piston wire retaining ring pressing equipment according to claim 5, characterized in that, The material of the elastic pusher is 65Mn steel.

7. The piston wire retaining ring pressing equipment according to claim 1, characterized in that, The support plate is provided with several weight-reduction holes.

8. The piston wire retaining ring pressing equipment according to claim 1, characterized in that, The inner surface roughness of the top straight hole, the bottom straight hole, and the middle conical hole is Ra3.2μm~Ra0.8μm; the connection between the top straight hole and the middle conical hole, as well as the connection between the middle conical hole and the bottom straight hole, are all smoothly transitioned by a circular arc surface.

9. The piston wire retaining ring pressing equipment according to claim 1, characterized in that, The wedge-shaped shrinkage device is made of 45 steel and is treated with tempering or quenching processes.

10. The piston wire retaining ring pressing equipment according to claim 1, characterized in that, The diameter of the top straight hole is 1.05 to 1.2 times the initial diameter of the wire retaining ring; the diameter of the bottom straight hole is 0.8 to 0.9 times the initial diameter of the wire retaining ring.

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