Needle bearing with sealing, heat-insulating and limiting device

Abstract

The utility model discloses a needle bearing with a sealing, heat-insulating and limiting device, and belongs to the field of bearings. Comprising a piston pin; the piston pin is sleeved with the bearing outer ring, an outer ring channel is formed in the inner wall of the bearing outer ring, and flange parts are arranged at the two ends of the bearing outer ring; the rolling body is arranged between the piston pin and the outer ring channel; the retainer is mounted on the rolling body; the two sealing assemblies are located at the two ends of the rolling body, one ends of the sealing assemblies abut against the flange parts, and the other ends of the sealing assemblies abut against the piston pin; a shaft shoulder part is arranged on the contact surface, close to the rolling body, of the piston pin; the sealing assembly comprises a gasket arranged on the piston pin, and one end of the gasket abuts against the shaft shoulder part. One end of the rubber sheet is connected to the gasket, and the other end of the rubber sheet abuts against the flange part. The needle bearing with the sealing, heat-insulating and limiting device has the beneficial effect that invasion of external impurities into the bearing is reduced.

Description

Technical Field

[0001] The present application relates to the field of bearings, and in particular to a needle roller bearing with a sealed, heat-insulating and limiting device. Background Art

[0002] In an oil-free piston air compressor, the motor drives the crankshaft, which then rotates. A connecting rod connects the crankshaft, converting this rotational motion into reciprocating motion. During this reciprocating motion, the gas in the cylinder is continuously compressed, increasing the pressure. When the pressure reaches a certain level, the compressed gas pushes open the exhaust valve, passing through the gas pipeline into the gas storage tank or the gas user. Simultaneously, the intake valve opens at the appropriate time, allowing external gas to enter the cylinder for the next round of compression.

[0003] However, with the continuous increase in demand scenarios, the requirements for piston oil-free air compressors have also increased. For example, with the increase in cylinder diameter, stroke, speed and other requirements, the bottlenecks encountered by air compressors have increased. After the changes in cylinder diameter, number of cylinders, stroke, speed, etc., the vibration of piston air compressors has intensified, the load has increased, and the wear between components has increased, leading to failure of the air compressor, especially the needle bearing between the connecting rod and the piston (attached Figure 3 In the figure: a is the piston pin, b is the bearing outer ring, c is the rolling element, and d is the retaining cage.) Due to strong vibration, high temperature, etc., the air compressor connecting rod and the piston cannot be positioned, and the connecting rod is prone to shifting left and right during operation, resulting in the inability to maintain a good fit clearance between the bottom of the connecting rod and the crank. Obvious friction occurs between the connecting rod and the crank, generating heat and metal powder. In addition, due to the vibration of the air compressor, the seal of the needle bearing cannot work properly in a centered manner, the lip cannot be effectively closed, and the seal may even fall off. Lubrication cannot be maintained and contamination leads to a large number of failures. The emergence of these problems indicates that the improvement of the structure of internal mating components and the life of bearings are posed challenges. Utility Model Content

[0004] The content of this application is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this application is not intended to identify key features or essential features of the technical solution for which protection is sought, nor is it intended to limit the scope of the technical solution for which protection is sought.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a needle roller bearing with a sealed heat-insulating limit device, including:

[0006] piston pin;

[0007] The outer ring of the bearing is sleeved on the piston pin, the inner wall of the outer ring of the bearing is provided with an outer ring groove, and both ends of the outer ring of the bearing are provided with ribs;

[0008] Rolling element, located between the piston pin and the outer ring groove;

[0009] Cage, mounted on the rolling element;

[0010] There are two sealing assemblies located at both ends of the rolling element, with one end of the sealing assembly abutting against the rib and the other end abutting against the piston pin;

[0011] The piston pin has a shaft shoulder on its contact surface close to the rolling element;

[0012] The sealing assembly includes:

[0013] A washer is provided on the piston pin, with one end abutting against the shaft shoulder;

[0014] One end of the rubber sheet is connected to the gasket, and the other end abuts against the rib.

[0015] This application uses the action of the shaft shoulder to reduce the deflection of the piston pin during operation and the contact accuracy of the rolling elements, thereby reducing the impact of stress concentration. The sealing component reduces the intrusion of external impurities into the bearing, which is beneficial to the lubrication life of the needle roller bearing during operation, thereby effectively extending the life of the bearing and air compressor, and significantly reducing the failure of bearings, connecting rods, and pistons caused by lubrication and excessive wear.

[0016] Furthermore, a limiting block is provided on the gasket, and a limiting groove for inserting the limiting block is provided on the rubber sheet.

[0017] Furthermore, a dustproof groove is provided on the outer ring of the bearing, and a sealing lip matching the dustproof groove is provided on one end surface of the rubber sheet.

[0018] Furthermore, the sealing lip is arranged in a slope.

[0019] Furthermore, a waist groove is provided on one end of the rubber sheet, and the waist groove is in a "V" shape.

[0020] Furthermore, centering sleeves are provided on both ends of the piston pin, the gasket is located between the shaft shoulder portion and the centering sleeve, and both ends of the gasket are respectively in contact with the shaft shoulder portion and the centering sleeve.

[0021] Furthermore, the end surface of the centering sleeve close to the gasket is configured as an inclined surface.

[0022] The beneficial effects of the present application are as follows: when a piston-type oil-free air compressor is operating at high speeds, with large cylinder diameters and long strokes, the piston and connecting rod will experience significant vibration, high temperatures and wear. The present application eliminates the traditional outer ring seal positioning method and adopts a piston pin and shaft shoulder positioning method, with the sealing lip acting on the outer ring seal groove. This facilitates the centering of the seal in strong vibration situations, effectively improves the grease retention inside the bearing and prevents the intrusion of external impurities. While providing the piston pin shaft shoulder, the thickness of the needle roller working part of the needle bearing is guaranteed to ensure load-bearing capacity. A centering sleeve is added between the piston pin and the piston hole for positioning, which improves the positioning accuracy between the connecting rod and the piston, preventing axial deviation of the connecting rod from causing friction between the connecting rod and the crank, thereby reducing the performance of the air compressor. When the connecting rod needle roller bearing, the connecting rod, the piston and other components are properly installed, the stability and safety of the crankshaft, connecting rod and piston mechanism system of the piston-type oil-free air compressor can be effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0024] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the elements and components are not necessarily drawn to scale.

[0025] In the attached figure:

[0026] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0027] Figure 2 yes Figure 1 A magnified view of part A;

[0028] Figure 3 It is a schematic diagram of the prior art.

[0029] Reference numerals:

[0030] 1. Piston pin; 2. Bearing outer ring; 3. Rolling element; 4. Cage; 5. Sealing assembly; 6. Groove; 7. Flange; 8. Shoulder; 9. Gasket; 10. Rubber sheet; 11. Limit block; 12. Sealing lip; 13. Waist groove; 14. Centering sleeve; 15. Inclined surface. DETAILED DESCRIPTION

[0031] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0032] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0033] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0034] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0035] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] Reference Figure 1-2 , a needle roller bearing with a sealing and heat-insulating limit device includes a piston pin 1, a bearing outer ring 2, a rolling element 3, a retainer 4, and a sealing assembly 5; the bearing outer ring 2 is sleeved on the piston pin 1, a channel 6 is provided on the inner wall of the bearing outer ring 2, the rolling element 3 is installed between the piston pin 1 and the channel 6, the retainer 4 is installed on the rolling element 3, and a rib portion 7 is provided at both ends of the bearing outer ring 2. There are two sealing assemblies 5 and they are located at both ends of the rolling element 3, and one end of the sealing assembly 5 abuts against the rib portion 7, and the other end abuts against the piston pin 1.

[0037] The contact surface of the piston pin 1 close to the rolling element 3 has a shoulder 8, which reduces the bending effect of the piston pin 1 during operation and the contact accuracy of the rolling element 3, thereby reducing the impact of stress concentration.

[0038] The sealing assembly 5 includes a gasket 9 and a rubber sheet 10. The gasket 9 is mounted on the piston pin 1, with one end abutting the shaft shoulder 8. The rubber sheet 10 is connected to the gasket 9 at one end and abuts the flange 7 at the other end. A stopper 11 is provided on the gasket 9, and a stopper groove is provided on the rubber sheet 10 for the stopper 11 to be inserted into. This provides radial and axial positioning, strengthens the structural strength between the gasket 9 and the rubber sheet 10, and improves product stability.

[0039] The gasket 9 is made of metal, such as stainless steel, and can guide the rolling element 3 to improve the stability of the needle roller bearing.

[0040] The rubber sheet 10 is made of a high temperature resistant material such as FKM and is formed by special vulcanization process.

[0041] The bearing outer ring 2 features a dustproof groove. The end surface of the rubber sheet 10, near the flange 7, has a sealing lip 12. This sloped lip 12 cooperates with the flange 7 of the bearing outer ring 2 to accommodate high vibration conditions. The combination of sealing lip 12 and the dustproof groove prevents the ingress of foreign matter, improving bearing internal cleanliness and extending bearing life.

[0042] A waist groove 13 is formed on one end of the rubber sheet 10. The waist groove 13 is V-shaped and provides the rubber sheet 10 with strong elasticity and toughness to support the sealing lip 12 to maintain good contact under vibration conditions.

[0043] Centering sleeves 14 are provided on both ends of the piston pin 1. The gasket 9 is located between the shaft shoulder 8 and the centering sleeve 14, and the two ends of the gasket 9 are respectively in contact with the shaft shoulder 8 and the centering sleeve 14. Among them, the end surface of the centering sleeve 14 near the gasket 9 is constructed into an inclined surface 15, which serves as an installation guide and solves the problem of difficult centering installation caused by the piston ring being a cylinder during installation. The centering sleeve 14 controls the radial limit of the piston pin 1 and the piston, as well as the axial position of the connecting rod and crank, preventing severe metal contact friction between the crank and the connecting rod and reducing vibration. The centering sleeve 14 can also isolate the friction heat of the piston, reduce the temperature rise of the connecting rod needle roller bearing, protect the bearing operating environment, and significantly increase the life of the connecting rod needle roller bearing. Each component completes the installation and use of the connecting rod needle roller bearing according to the process requirements. This application adopts the cooperation of the shaft shoulder, the centering sleeve 14 and the gasket 9, and the gasket 9 and the shaft shoulder interact with each other for positioning. The seal can still maintain a good centering effect under strong vibration and high temperature conditions, which is beneficial to the storage of internal grease and the protection of internal cleanliness, and is beneficial to improving the bearing life.

[0044] The above description is only an illustration of some preferred embodiments of the present disclosure and the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A needle roller bearing with a sealed, heat-insulating, and limiting device, comprising: piston pin; The outer ring of the bearing is sleeved on the piston pin, the inner wall of the outer ring of the bearing is provided with an outer ring groove, and the two ends of the outer ring of the bearing are provided with ribs; A rolling element, disposed between the piston pin and the outer ring groove; A retainer, mounted on the rolling element; Its characteristics are: The needle roller bearing with a sealing and heat-insulating limiting device also includes: Two sealing assemblies are located at both ends of the rolling element, with one end of the sealing assembly abutting against the rib portion and the other end abutting against the piston pin; The piston pin has a shoulder portion on its contact surface close to the rolling element; The sealing assembly comprises: A washer is provided on the piston pin, with one end abutting against the shaft shoulder; One end of the rubber sheet is connected to the gasket, and the other end abuts against the rib.

2. The needle roller bearing with a sealed heat-insulating limiter according to claim 1, characterized in that: The gasket is provided with a limiting block, and the rubber sheet is provided with a limiting groove for inserting the limiting block.

3. The needle roller bearing with a sealed heat-insulating limiter according to claim 1, characterized in that: The outer ring of the bearing is provided with a dustproof groove, and one end surface of the rubber sheet is provided with a sealing lip matched with the dustproof groove.

4. The needle roller bearing with a sealed heat-insulating limiter according to claim 3, characterized in that: The sealing lip is arranged as a slope.

5. The needle roller bearing with a sealed heat-insulating limiter according to claim 1, characterized in that: One end of the rubber sheet is provided with a waist groove, which is in a V-shape.

6. The needle roller bearing with a sealed heat-insulating limiter according to claim 1, characterized in that: Centering sleeves are provided on both ends of the piston pin, the gasket is located between the shaft shoulder and the centering sleeve, and both ends of the gasket are respectively in contact with the shaft shoulder and the centering sleeve.

7. The needle roller bearing with a sealed heat-insulating limiter according to claim 6, characterized in that: The end surface of the centering sleeve close to the gasket is configured as an inclined surface.

Images