MIM shuttle bracket guide rail with self-lubricating structure

Abstract

The application relates to the technical field of sewing machine accessories, in particular to an MIM shuttle holder guide rail with a self-lubricating structure, which comprises a shuttle holder body, a guide rail ring is fixedly connected to the outside of the shuttle holder body, a centrifugal oil storage mechanism is arranged in the inside of the guide rail ring, a track lubricating distribution mechanism is arranged on the outside of the guide rail ring, an auxiliary heat dissipation mechanism is arranged in the inside of the shuttle holder body, the centrifugal oil storage mechanism comprises an annular oil storage cavity, the annular oil storage cavity is arranged in the inside of the guide rail ring, a centrifugal flow guide groove is fixedly connected to the inner wall of the annular oil storage cavity, a flexible oil-containing sponge ring is fixedly connected to the inside of the centrifugal flow guide groove, a plurality of throttling micropores are arranged on the outer wall of the annular oil storage cavity, and a plurality of flow guide baffles are fixedly connected to the inside of the annular oil storage cavity in a staggered mode. The centrifugal oil storage mechanism releases oil and forms an oil film through distribution coating, so that long-term uniform lubrication and the effect of preventing oil splashing are achieved.

Description

Technical Field

[0001] This invention relates to the field of sewing machine accessories technology, specifically to a MIM shuttle guide rail with a self-lubricating structure. Background Technology

[0002] As a core transmission and support component in sewing equipment, the sewing machine shuttle guide rail is subjected to high-frequency, high-speed rotational friction during actual production operations. In order to ensure the working life and operational accuracy of the components, a certain oil film must be maintained at the sliding interface of the guide rail. The coefficient of friction of the track interface is directly related to the energy consumption of the drive motor and the stability of the sewing stitch. Metal contact surfaces lacking effective lubrication will accumulate a large amount of frictional heat in a short time and cause irreversible wear. A continuous and reliable oil supply mechanism is needed to maintain the high-speed automated operation of the equipment.

[0003] Traditional lubrication methods typically involve manually dripping lubricating oil periodically or using an externally mounted independent oil pump for timed and metered oil supply. This localized, single-point lubrication mode is limited by the dripping location and the influence of gravity, making it impossible to ensure uniform coverage of the circumferential surface of the guide ring throughout its entire lifespan. Furthermore, excessive accumulation of liquid lubricating oil on the surface is pulled outwards by the strong centrifugal force accompanying the high-speed rotation of rotating parts, causing uncontrolled splashing of industrial oil. This splashed industrial oil directly adheres to the surface of the sewing and textile materials being processed, resulting in localized, unwashable contamination of finished products in batches. This significantly increases the defect rate in industrial production and cannot meet the stringent requirements of modern high-speed automated sewing equipment for a clean processing environment and long-term maintenance-free internal mechanisms.

[0004] Therefore, this invention proposes a MIM shuttle guide rail with a self-lubricating structure to overcome the shortcomings of the prior art. Summary of the Invention

[0005] In view of the problems existing in the sewing machine shuttle guide, such as the lack of a uniform and long-lasting self-lubricating mechanism during high-speed operation, uneven lubrication caused by local single-point oiling, and uncontrolled ejection of excessive lubricating oil under centrifugal force, which contaminates the sewing material, the present invention aims to provide a self-lubricating MIM shuttle guide with an improved structure that can effectively solve the above problems.

[0006] The present invention provides a MIM shuttle guide rail with a self-lubricating structure, comprising: a shuttle body and a guide rail ring.

[0007] The guide ring has a centrifugal oil storage mechanism inside, a track lubrication distribution mechanism outside, and an auxiliary heat dissipation mechanism inside.

[0008] Furthermore, the centrifugal oil storage mechanism includes an annular oil storage cavity formed inside the guide rail ring. A centrifugal guide groove is fixedly connected to the inner wall of the annular oil storage cavity. A flexible oil-containing sponge ring is fixedly connected inside the centrifugal guide groove. Multiple throttling microholes are formed on the outer wall of the annular oil storage cavity. Multiple guide baffles are fixedly connected in an alternating manner inside the annular oil storage cavity.

[0009] The track lubrication distribution mechanism includes a lubrication distribution strip disposed outside the guide rail ring. Two V-shaped oil guide grooves are formed on the outside of the lubrication distribution strip. Multiple capillary oil seepage holes are uniformly formed on the outer surface of the lubrication distribution strip. An oil scraping and recovery ring is fixedly connected between adjacent two V-shaped oil guide grooves. A return slope is formed at the bottom of the lubrication distribution strip.

[0010] The auxiliary heat dissipation mechanism includes multiple heat dissipation air guide slots, each formed on the inner wall of the shuttle frame body, and each of the multiple heat dissipation air guide slots has a vortex guide block fixedly connected inside.

[0011] The shuttle frame body has multiple airflow diffusion holes around its outer perimeter, and a convection notch is provided on the front side of the shuttle frame body.

[0012] A limiting guide post is fixedly connected to the center of the shuttle frame body, and the limiting guide post is made of stainless steel.

[0013] The outer surface of the limiting guide post is coated with a polytetrafluoroethylene (PTFE) wear-resistant coating, and the thickness of the PTFE wear-resistant coating is evenly distributed on the cylindrical surface of the limiting guide post.

[0014] The shuttle frame body has multiple weight-reducing perforated windows around its outer perimeter, and these windows are distributed in an equidistant array along the circumference of the shuttle frame body.

[0015] The flexible oil-impregnated sponge ring is made of high-molecular polyurethane foam material.

[0016] The outer cross-section of the oil scraping and recovery ring has a trapezoidal structure.

[0017] This invention provides a MIM shuttle guide rail with a self-lubricating structure, which has the following advantages compared with the prior art: 1. This invention features an integrally formed annular oil storage cavity inside the guide rail ring and a built-in flexible oil-containing sponge ring. The centrifugal force generated by the high-speed operation of the equipment allows the lubricating oil to overcome resistance and be released outward. After being damped and rectified by the baffle, it seeps out through the throttling micropores. Combined with the distribution band on the outer side with oil guide grooves and capillary pores, the lubricating oil is spread into a uniform dynamic oil film on the contact surface by geometric stretching. At the same time, the oil scraping and recovery ring and the return slope guide the excess old oil to the inner side for recovery. This solves the problems of uneven lubrication caused by manual dripping or external oil pump supply, and the problem of excessive grease splashing and contaminating sewing fabric due to centrifugal force.

[0018] 2. The present invention constructs an airflow heat dissipation channel inside the shuttle body. External air rushes into the interior through the front opening, travels along the heat dissipation air guide groove and is blocked and interfered with by the vortex guide block. The horizontal airflow is transformed into a micro vortex shape, which increases the heat exchange area between the air and the metal interface. The heated airflow after absorbing the frictional heat is then discharged through the peripheral holes, maintaining a reasonable temperature range of the guide rail working interface.

[0019] 3. The present invention applies a wear-resistant coating to the outside of the central limiting guide post to reduce direct friction loss between rotating shafts, and by opening multiple weight-reducing hollow windows on the side wall of the shuttle body, the overall rotational inertia of the rotating parts is reduced while increasing the cross-sectional area of ​​the internal heat dissipation channel, thereby improving the sensitivity of the start and stop response of the drive device. Attached Figure Description

[0020] Figure 1 This is a perspective view of a MIM shuttle guide rail with a self-lubricating structure proposed in this invention; Figure 2 This is a front view of a MIM shuttle guide rail with a self-lubricating structure proposed in this invention; Figure 3 This is a schematic diagram of the auxiliary heat dissipation mechanism in a MIM shuttle guide rail with a self-lubricating structure proposed in this invention. Figure 4 This is a structural schematic diagram of the guide ring in a MIM shuttle guide rail with a self-lubricating structure proposed in this invention. Figure 5 This is a schematic diagram of the track lubrication distribution mechanism in a MIM shuttle guide rail with a self-lubricating structure proposed in this invention; Figure 6 This is a cross-sectional view of the lubrication distribution zone in a MIM shuttle guide rail with a self-lubricating structure proposed in this invention; Figure 7 This is a schematic diagram of a centrifugal oil storage mechanism in a MIM shuttle guide rail with a self-lubricating structure proposed in this invention. Figure 8 This is a cross-sectional view of the guide ring in a MIM shuttle guide rail with a self-lubricating structure proposed in this invention.

[0021] In the diagram: 1. Shuttle body; 2. Guide rail ring; 3. Centrifugal oil storage mechanism; 31. Annular oil storage chamber; 32. Centrifugal guide groove; 33. Flexible oil-impregnated sponge ring; 34. Throttling micro-orifice; 35. Guide baffle; 4. Track lubrication distribution mechanism; 41. Lubrication distribution strip; 42. V-shaped oil guide groove; 43. Capillary oil seepage hole; 44. Oil scraping and recovery ring; 45. Return slope; 5. Auxiliary heat dissipation mechanism; 51. Heat dissipation air guide groove; 52. Vortex guide block; 53. Airflow diffuser hole; 54. Convection notch; 6. Limiting guide post; 7. Polytetrafluoroethylene wear-resistant coating; 8. Weight-reducing perforated window. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Example: Please refer to Figures 1 to 8 This invention provides a MIM shuttle guide with a self-lubricating structure, which aims to solve the problem that existing sewing machine shuttle guides are prone to wear at high speeds and that external lubricating oil can easily splash and contaminate the fabric.

[0024] Please refer to Figure 1 , Figure 4 and Figure 7 A self-lubricating MIM shuttle guide includes a shuttle body 1 and a guide ring 2 fixedly connected to the outside of the shuttle body 1. The shuttle body 1 provides the main support for the entire guide assembly and cooperates with the sewing machine drive structure. The guide ring 2 is used to generate a relative sliding cooperation with the relevant parts of the sewing machine. The guide ring 2 is provided with a centrifugal oil storage mechanism 3 inside and a track lubrication distribution mechanism 4 outside. The shuttle body 1 is provided with an auxiliary heat dissipation mechanism 5 inside. The centrifugal oil storage mechanism 3 automatically releases the internally stored lubricating oil to the outside by relying on the centrifugal force generated by the operation. The track lubrication distribution mechanism 4 receives the released lubricating oil and coats it on the outer surface of the guide ring 2 to form an oil film. The auxiliary heat dissipation mechanism 5 uses the air flow introduced by the high-speed rotation to carry away the heat generated by friction.

[0025] Please refer to Figure 4 , Figure 7 and Figure 8The centrifugal oil storage mechanism 3 includes an annular oil storage chamber 31, which is located inside the guide ring 2. The annular oil storage chamber 31 is a hollow chamber integrally formed inside the guide ring 2 using MIM technology, providing space for long-term storage of lubricating oil. A centrifugal guide channel 32 is fixedly connected to the inner wall of the annular oil storage chamber 31. A flexible oil-impregnating sponge ring 33 is fixedly connected inside the centrifugal guide channel 32. The flexible oil-impregnating sponge ring 33 is made of high-molecular polyurethane foam material. Through its porous structure, the flexible oil-impregnating sponge ring 33 adsorbs and stores liquid lubricating oil inside, preventing the lubricating oil from flowing and leaking freely when the equipment is stationary. The centrifugal guide channel 32 has a specific structure... The flexible oil-impregnated sponge ring 33 provides positioning and support, while also guiding the lubricating oil to move outward under centrifugal force. The outer wall of the annular oil storage cavity 31 is provided with multiple throttling micro-holes 34, and multiple flow guide baffles 35 are fixedly connected in an alternating manner inside the annular oil storage cavity 31. When the equipment is running at high speed, the lubricating oil inside the flexible oil-impregnated sponge ring 33 is thrown outward by centrifugal force and enters the outer space of the annular oil storage cavity 31. The staggered flow guide baffles 35 play a damping and rectifying role on the thrown-out lubricating oil, making the oil pressure more evenly distributed in the circumferential direction in the cavity. The lubricating oil after pressure equalization permeates to the outside through the throttling micro-holes 34 by capillary action, thereby limiting and controlling the amount of oil output to the outside.

[0026] Please refer to Figure 1 , Figure 5 and Figure 6 The track lubrication distribution mechanism 4 includes a lubrication distribution belt 41, which is disposed on the outside of the aforementioned guide ring 2. The lubrication distribution belt 41 is attached to and wrapped around the outer circumferential surface of the guide ring 2, serving as a buffer surface for the outward seepage of oil from the centrifugal oil storage mechanism 3 and a lubrication working surface in contact with external moving parts. Multiple capillary seepage holes 43 are uniformly opened on the outer surface of the lubrication distribution belt 41. The lubricating oil seeping out of the throttling micropores 34 in the aforementioned centrifugal oil storage mechanism 3 directly enters the capillary seepage holes 43. The capillary seepage holes 43 rely on the capillary phenomenon generated by their small pore size to uniformly guide the liquid lubricating oil to permeate to the outer surface.

[0027] Please refer to Figure 5 , Figure 6 and Figure 8Two V-shaped oil guide grooves 42 are formed on the outside of the lubrication distribution belt 41. The two V-shaped oil guide grooves 42 are distributed parallel to each other in the circumferential direction on both sides of the capillary oil seepage hole 43. The specific V-shaped cross-sectional geometry of the V-shaped oil guide grooves 42 can guide the seeped lubricating oil to stretch along the tangential direction and spread to both sides in the groove, forming a uniform dynamic self-lubricating oil film during the high-speed operation of the guide ring 2. An oil scraping and recovery ring 44 is fixedly connected between the adjacent two V-shaped oil guide grooves 42. The external cross-section of the device is trapezoidal. The trapezoidal slope of the oil scraping and recovery ring 44 acts as a physical scraper, which scrapes down the excess old oil droplets attached to the working surface of the guide rail during operation. The bottom of the lubrication distribution belt 41 is provided with a return slope 45. The return slope 45 extends obliquely to the inner edge of the guide rail ring 2. The old lubricating oil scraped by the oil scraping and recovery ring 44 is guided to the inner recovery area along the angle of the return slope 45, preventing excess grease from splashing outward and contaminating the sewn fabric under the action of centrifugal force.

[0028] Please refer to Figure 1 , Figure 2 and Figure 3 The shuttle body 1 is equipped with an auxiliary heat dissipation mechanism 5. The auxiliary heat dissipation mechanism 5 uses the hydrodynamic effect of high-speed rotation to provide air cooling for the aforementioned guide ring 2. A convection notch 54 is opened on the front side of the shuttle body 1. The convection notch 54 with an arc-shaped cross section is exposed to the outside air and acts as an air inlet for cold air to enter the interior of the shuttle body 1. Multiple airflow diffusion holes 53 are opened around the outside of the shuttle body 1. The airflow diffusion holes 53 are arranged in a circular array and penetrate the outer side wall of the shuttle body 1. The airflow diffusion holes 53 serve as air outlets for the high-temperature airflow after heat exchange. The air inlet and the air outlet cooperate to establish a complete air convection channel inside the equipment.

[0029] Please refer to Figure 3 and Figure 8 The auxiliary heat dissipation mechanism 5 includes multiple heat dissipation air guide slots 51, which are recessed on the inner wall of the shuttle body 1. The heat dissipation air guide slots 51 extend along the direction of airflow and guide the advection air flowing in from the convection gap 54 to the frictional heat generation area. The interior of each heat dissipation air guide slot 51 is fixedly connected with a vortex guide block 52. The vortex guide block 52 acts as a physical barrier protruding from the bottom surface of the slot to block the smooth airflow. When the advection air flows through the vortex guide block 52, it is disturbed and diverted. The original laminar flow state is broken and a forced convection micro vortex is formed. The high-speed tumbling of the micro vortex increases the heat exchange area between the air and the metal surface of the shuttle body 1, and quickly absorbs the frictional heat conducted from the metal parts. The heated high-temperature airflow is discharged through the surrounding airflow diffuser holes 53 under the compression of centrifugal force and subsequent cold air, maintaining the temperature balance of the core working area.

[0030] Please refer to Figure 1 , Figure 2 and Figure 8 The aforementioned shuttle body 1 has a fixed connection to a limiting guide post 6 at its internal center. The limiting guide post 6 serves as a rotating shaft and is inserted into the matching sleeve of the sewing machine to complete the center positioning support. The limiting guide post 6 is made of stainless steel, which provides the basic structural strength for axial support at high speeds. The outer surface of the limiting guide post 6 is coated with a polytetrafluoroethylene wear-resistant coating 7. The thickness of the polytetrafluoroethylene wear-resistant coating 7 is evenly distributed on the cylindrical surface of the limiting guide post 6. The polytetrafluoroethylene wear-resistant coating 7 wraps around the metal surface and acts as a contact isolation medium. The low friction coefficient of polytetrafluoroethylene material reduces the surface wear generated when the central shaft and the outer sleeve rotate relative to each other at high frequency.

[0031] Please refer to Figure 1 , Figure 2 and Figure 3 Multiple weight-reducing perforated windows 8 are provided around the outer perimeter of the shuttle frame body 1. These windows 8 are distributed in an equidistant array along the circumference of the shuttle frame body 1. The weight-reducing perforated windows 8 penetrate the side wall of the shuttle frame body 1 to form an air-avoiding area. Removing some metal material reduces the overall mass and rotational inertia of the shuttle frame body 1. The lower rotational inertia makes the corresponding drive motor more responsive when given start and stop commands. At the same time, the openings of the weight-reducing perforated windows 8 increase the communication area between the internal cavity and the external environment, expand the cross-section of the air circulation channel, and accelerate the dissipation of internal heat.

[0032] Working principle: When the sewing machine starts, the external drive mechanism drives the limiting guide post 6 and the shuttle body 1 to rotate at high speed, and the guide ring 2 fixed to the outside of the shuttle body 1 rotates synchronously. During the high-speed rotation, the flexible oil-containing sponge ring 33 inside the centrifugal oil storage mechanism 3 is subjected to continuous centrifugal force, and the liquid lubricating oil stored inside overcomes the adsorption force of the sponge and is thrown outward. The thrown-out lubricating oil enters the annular oil storage cavity 31, and the pressure tends to be uniform after the damping and rectification effect of the guide baffle 35. Then, it permeates to the outside of the guide ring 2 through the throttling micropores 34.

[0033] The leaked lubricating oil enters the capillary oil leakage holes 43 of the track lubrication distribution mechanism 4. During high-speed operation of the guide ring 2, the lubricating oil is guided to the outer lubrication distribution band 41. Influenced by the cross-sectional geometry of the V-shaped oil guide groove 42, the lubricating oil stretches along the tangential direction within the groove and spreads to both sides, forming a uniform dynamic self-lubricating oil film on the working surface that rubs against external components. During continuous operation, the scraper and recovery ring 44 between adjacent V-shaped oil guide grooves 42 scrapes down excess old oil droplets from the guide surface. The collected old lubricating oil is guided to the inner recovery area along the bottom return slope 45, preventing excess grease from splashing under centrifugal force.

[0034] While the equipment generates frictional heat during high-speed operation, external cool air rushes into the interior through the convection notch 54 on the front side of the shuttle body 1. The advection air entering the interior flows along the heat dissipation guide slot 51 and is disturbed after encountering the vortex guide block 52, forming a forced convection micro-vortex. The micro-vortex contacts the metal surface of the shuttle body 1 and absorbs the transferred frictional heat. The high-temperature airflow after absorbing heat is discharged to the outside through the surrounding airflow diffuser holes 53 and weight-reducing perforated windows 8 under the compression of centrifugal force and subsequent cool air, maintaining a reasonable working temperature for the guide rail ring 2 during high-speed operation. By combining oil circulation with airflow heat dissipation, the problems of high-temperature wear of the shuttle guide rail and easy splashing of lubricating oil contaminating the fabric in traditional sewing machines are solved.

[0035] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A MIM shuttle guide rail with self-lubricating structure, comprising a shuttle body (1), a guide rail ring (2) is fixedly connected to the outside of the shuttle body (1), characterized in that, The guide ring (2) is provided with a centrifugal oil storage mechanism (3) inside, and a track lubrication distribution mechanism (4) is provided on the outside of the guide ring (2). The shuttle body (1) is provided with an auxiliary heat dissipation mechanism (5). The centrifugal oil storage mechanism (3) includes an annular oil storage cavity (31). The annular oil storage cavity (31) is opened inside the guide ring (2). The inner wall of the annular oil storage cavity (31) is fixedly connected with a centrifugal guide groove (32). The interior of the centrifugal guide groove (32) is fixedly connected with a flexible oil-containing sponge ring (33). The outer wall of the annular oil storage cavity (31) is provided with multiple throttling microholes (34). The interior of the annular oil storage cavity (31) is fixedly connected with multiple guide baffles (35) in an alternating manner.

2. The MIM shuttle rail with self-lubricating structure according to claim 1, characterized in that, The track lubrication distribution mechanism (4) includes a lubrication distribution belt (41), which is located outside the guide rail ring (2). Two V-shaped oil guide grooves (42) are opened on the outside of the lubrication distribution belt (41). Multiple capillary oil seepage holes (43) are evenly opened on the outer surface of the lubrication distribution belt (41). An oil scraping and recovery ring (44) is fixedly connected between the two adjacent V-shaped oil guide grooves (42). A return slope (45) is opened at the bottom of the lubrication distribution belt (41).

3. The MIM shuttle rail with self-lubricating structure according to claim 1, characterized in that, The auxiliary heat dissipation mechanism (5) includes multiple heat dissipation air guides (51), all of which are opened on the inner wall of the shuttle body (1), and each of the multiple heat dissipation air guides (51) is fixedly connected with a vortex guide block (52).

4. A MIM shuttle guide rail with a self-lubricating structure according to claim 3, characterized in that, The shuttle body (1) has multiple airflow diffusion holes (53) around its outer perimeter, and a convection notch (54) is provided on the front side of the shuttle body (1).

5. A MIM shuttle guide rail with a self-lubricating structure according to claim 1, characterized in that, The shuttle body (1) is fixedly connected to the center of the internal center of the shuttle body (6).

6. A MIM shuttle guide rail with a self-lubricating structure according to claim 5, characterized in that, The outer surface of the limiting guide post (6) is coated with a polytetrafluoroethylene wear-resistant coating (7), and the thickness of the polytetrafluoroethylene wear-resistant coating (7) is evenly distributed on the cylindrical surface of the limiting guide post (6).

7. A MIM shuttle guide rail with a self-lubricating structure according to claim 1, characterized in that, The shuttle frame body (1) has multiple weight-reducing hollow windows (8) around its outer perimeter, and the multiple weight-reducing hollow windows (8) are distributed in an equidistant array along the circumference of the shuttle frame body (1).

8. A MIM shuttle guide rail with a self-lubricating structure according to claim 1, characterized in that, The flexible oil-impregnated sponge ring (33) is made of high-molecular polyurethane foam material.

9. A MIM shuttle guide rail with a self-lubricating structure according to claim 2, characterized in that, The outer cross-section of the oil scraping and recovery ring (44) has a trapezoidal structure.

10. A MIM shuttle guide rail with a self-lubricating structure according to claim 5, characterized in that, The limiting guide post (6) is made of stainless steel.

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