Piston assembly of automotive air compressor
By using needle roller bearings to connect the primary and secondary piston assemblies in the piston assembly of the two-stage air compressor, and adding bushings to the connecting pins, the loosening problem caused by axial movement of the piston assembly during long-term use was solved, achieving high load-bearing capacity and stability, and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 普莱德汽车科技(苏州)有限公司
- Filing Date
- 2025-09-10
- Publication Date
- 2026-07-03
AI Technical Summary
The piston assembly of the secondary air compressor is connected to a pin via a single deep groove ball bearing during operation, which results in significant axial movement. After prolonged use, this may cause loosening and affect product stability.
Needle roller bearings are used to connect the first and second stage piston assemblies. Needle roller bearings are provided at the connection points between the connecting pins and the first and second stages, and bushings are provided outside the connecting pins to increase the contact area, disperse stress, and improve stability.
It improves the load-bearing capacity and stability of the piston assembly, reduces wear, extends service life, and has a simple structure that is easy to maintain.
Smart Images
Figure CN224453014U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive air compressor technology, and in particular to a piston assembly for an automotive air compressor. Background Technology
[0002] An automotive air compressor is a mechanical device that generates energy by compressing air. To improve efficiency, most automotive air compressors now use a two-stage air compressor, which means that the gas compressed by the first-stage air compressor is compressed a second time.
[0003] Currently, in the piston assembly of a two-stage air compressor, the first and second stage pistons are connected to a pin via a single deep groove ball bearing during operation. This connection method results in significant axial movement, which may lead to loosening after prolonged use, thus greatly affecting the stability of the entire product. Utility Model Content
[0004] Therefore, it is necessary to address the aforementioned technical problems in the existing technology by providing a piston assembly for an automotive air compressor that is highly adaptable, compact, tightly sealed, and possesses high load-bearing capacity and stability.
[0005] To solve the above technical problems, the technical solution adopted by this utility model is as follows:
[0006] A piston assembly for an automotive air compressor includes: a primary piston assembly, a secondary piston assembly, and a connecting assembly. The connecting assembly connects the primary piston assembly and the secondary piston assembly. The primary piston assembly includes a primary piston body and a primary connecting portion connected to the primary piston body. The secondary piston assembly includes a secondary piston body and a secondary connecting portion connected to the secondary piston body. The connecting assembly includes connecting pins, which are respectively inserted into the primary connecting portion and the secondary connecting portion to connect the primary piston assembly and the secondary piston assembly. Needle roller bearings are provided between the connecting pins and the primary connecting portion and the secondary connecting portion, respectively.
[0007] In one feasible implementation, the primary connecting part is located at the center of the primary piston body and extends along the axial direction of the primary piston body. The connecting pin is inserted on the side of the primary connecting part closer to the primary piston body, and the drive mechanism is connected to the side of the primary connecting part away from the primary piston body.
[0008] In one feasible implementation, the secondary connection is located at the center of the secondary piston body and extends along the axial direction of the secondary piston body, with the connecting pin inserted on the side of the secondary connection away from the secondary piston body.
[0009] In one feasible implementation, the secondary connection includes a connecting arm, a first branch, and a second branch. One end of the connecting arm is connected to the center of the secondary piston body. The first branch and the second branch are respectively connected to the other end of the connecting arm. The first branch and the second branch are arranged parallel to each other and spaced apart. Connecting pins are respectively inserted on the side of the first branch and the second branch away from the secondary piston body. The primary connection is located between the first branch and the second branch.
[0010] In one feasible implementation, a first needle roller bearing is provided between the first branch and the connecting pin, and a second needle roller bearing is provided between the second branch and the connecting pin.
[0011] In one feasible implementation, the connecting pins are radially parallel to the first-stage piston body and the second-stage piston body, respectively, and perpendicular to the first-stage connecting portion and the second-stage connecting portion, respectively.
[0012] In one feasible implementation, the connecting assembly further includes a bushing that is fitted over the connecting pin and located within the primary connecting portion, with the bushing positioned between the first needle roller bearing and the second needle roller bearing.
[0013] In one feasible implementation, a first sealing ring is provided on the outside of the first-stage piston body.
[0014] In one feasible implementation, a second sealing ring is provided on the outside of the secondary piston body.
[0015] To solve the above technical problems, another technical solution adopted by this utility model is:
[0016] An automotive air compressor includes a piston assembly as described above.
[0017] Due to the adoption of the above technical solutions, this utility model has the following advantages compared with the prior art:
[0018] 1. This utility model has a high load-bearing capacity because the needle roller bearing, due to its special structural design, is equipped with slender rollers, which can withstand a high load with a small cross-section.
[0019] 2. This utility model improves wear resistance and tightness. The bushing is located between two needle roller bearings, which can increase the contact area between the bearings and the connecting pin, thereby effectively dispersing stress and improving the stability and durability of the connection. At the same time, the bushing reduces the wear between the connecting pin and the two bearings, extending the service life. It can also adjust the gap between the connecting pin and the bearing to ensure the tightness and accuracy of the connection.
[0020] 3. This utility model has a simple structure and is easy to disassemble. Because the pin connection has the characteristics of simple structure, easy processing and installation, strong disassembly, and also easy maintenance and replacement of parts. Attached Figure Description
[0021] Figure 1 This is an exploded structural diagram of the piston assembly of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure of the two-stage piston assembly of this utility model;
[0023] Figure 3 This is a schematic diagram of the structure of the first-stage piston assembly of this utility model;
[0024] Figure 4 This is a schematic diagram of the piston assembly of this utility model;
[0025] Figure 5 for Figure 4 A sectional view.
[0026] Among them: 10. First-stage piston assembly; 11. First-stage piston body; 12. First-stage connecting part;
[0027] 20. Secondary piston assembly; 21. Secondary piston body; 22. Secondary connecting part; 221. Connecting arm; 222. First branch; 223. Second branch;
[0028] 30. Connecting component; 31. Connecting pin; 32. Bushing;
[0029] 40. Needle roller bearing; 41. First needle roller bearing; 42. Second needle roller bearing. Detailed Implementation
[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," and similar expressions used in this document are for illustrative purposes only.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, " / " means "or".
[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0034] Currently, in the piston assembly of a two-stage air compressor, the first and second stage pistons are connected to a pin via a single deep groove ball bearing during operation. This connection method results in significant axial movement, which may lead to loosening after prolonged use, thus greatly affecting the stability of the entire product.
[0035] Based on this, the present invention provides a piston assembly for an automotive air compressor, comprising: a primary piston assembly, a secondary piston assembly, and a connecting assembly. The connecting assembly connects the primary piston assembly and the secondary piston assembly. The primary piston assembly includes a primary piston body and a primary connecting part connected to the primary piston body. The secondary piston assembly includes a secondary piston body and a secondary connecting part connected to the secondary piston body. The connecting assembly includes connecting pins, which are respectively inserted into the primary connecting part and the secondary connecting part to connect the primary piston assembly and the secondary piston assembly. Needle roller bearings are provided between the connecting pins and the primary connecting part and the secondary connecting part.
[0036] The piston assembly of this automotive air compressor is highly adaptable, compact, tightly sealed, and has high load-bearing capacity and stability.
[0037] The following is in conjunction with the appendix Figure 1-5 The present invention will be described in detail below with reference to specific embodiments.
[0038] This embodiment discloses a piston assembly for an automotive air compressor, comprising: a primary piston assembly 10, a secondary piston assembly 20, and a connecting assembly 30, wherein the connecting assembly 30 connects the primary piston assembly 10 and the secondary piston assembly 20.
[0039] Specifically, the first-stage piston assembly 10 includes a first-stage piston body 11 and a first-stage connecting portion 12 connected to the first-stage piston body 11. The first-stage connecting portion 12 is located at the center of the first-stage piston body 11 and extends along the axial direction of the first-stage piston body 11 toward the second-stage piston assembly 20. The first-stage connecting portion 12 is perpendicular to the first-stage piston body 11.
[0040] The secondary piston assembly 20 includes a secondary piston body 21 and a secondary connecting portion 22 connected to the secondary piston body 21. The secondary connecting portion 22 is located at the center of the secondary piston body 21 and extends axially toward the primary piston assembly 10 along the secondary piston body 21. The secondary connecting portion 22 is perpendicular to the secondary piston body 21. The secondary piston body 21 and the primary piston body 11 are parallel to each other.
[0041] The connecting assembly 30 includes connecting pins 31, which are respectively inserted into the primary connecting portion 12 and the secondary connecting portion 22 to connect the primary piston assembly 10 and the secondary piston assembly 20, thereby connecting and positioning the entire structure. Specifically, the connecting pins 31 are inserted into the primary connecting portion 12 on the side closer to the primary piston body 11, and the side of the primary connecting portion 12 away from the primary piston body 11 is connected to the drive mechanism. The connecting pins 31 are inserted into the secondary connecting portion 22 on the side away from the secondary piston body 21.
[0042] In this embodiment, the secondary connecting part 22 includes a connecting arm 221, a first branch 222, and a second branch 223. One end of the connecting arm 221 is connected to the center of the secondary piston body 21. The first branch 222 and the second branch 223 are respectively connected to the other end of the connecting arm 221. The first branch 222 and the second branch 223 are arranged parallel to each other at intervals. The connecting pins 31 are respectively inserted on the side of the first branch 222 and the second branch 223 away from the secondary piston body 21. The primary connecting part 12 is located between the first branch 222 and the second branch 223, and is parallel to the first branch 222 and the second branch 223 respectively.
[0043] In this embodiment, a needle roller bearing 40 is provided between the connecting pin 31 and the secondary connecting part 22. The needle roller bearing 40 includes a first needle roller bearing 41 and a second needle roller bearing 42. Specifically, the first needle roller bearing 41 is provided between the first branch 222 and the connecting pin 31, and the second needle roller bearing 42 is provided between the second branch 223 and the connecting pin 31. This structure can greatly withstand the radial load borne by the entire piston during reciprocating motion, and its compact structure reduces the occurrence of vibration.
[0044] In this embodiment, the connecting pin 31 is radially parallel to the first-stage piston body 11 and the second-stage piston body 21, respectively, and the connecting pin 31 is perpendicular to the first-stage connecting part 12 and the second-stage connecting part 22, respectively.
[0045] In this embodiment, the connecting assembly 30 further includes a bushing 32, which is sleeved outside the connecting pin 31 and located inside the primary connecting portion 12. The bushing 32 is located between the first needle roller bearing 41 and the second needle roller bearing 42, which can increase the contact area between the needle roller bearing 40 and the connecting pin 31, thereby dispersing stress and improving the stability and durability of the connection.
[0046] In this embodiment, for better sealing effect, a first sealing ring 13 is provided on the outside of the first-stage piston body 11, and a second sealing ring 23 is provided on the outside of the second-stage piston body 21.
[0047] This utility model also provides an automotive air compressor, including the piston assembly described in the above embodiment, which should have the advantages of the piston assembly described above.
[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A piston assembly for an automotive air compressor, characterized by, include: The assembly includes a primary piston assembly (10), a secondary piston assembly (20), and a connecting assembly (30). The connecting assembly (30) connects the primary piston assembly (10) and the secondary piston assembly (20). The primary piston assembly (10) includes a primary piston body (11) and a primary connecting part (12) connected to the primary piston body (11). The secondary piston assembly (20) includes a secondary piston body (21) and a secondary connecting part (22) connected to the secondary piston body (21). The connecting assembly (30) includes a connecting pin (31). The connecting pin (31) is respectively inserted into the primary connecting part (12) and the secondary connecting part (22) to connect the primary piston assembly (10) and the secondary piston assembly (20). A needle roller bearing (40) is provided between the connecting pin (31) and the primary connecting part (12) and the secondary connecting part (22).
2. The piston assembly of claim 1, wherein, The primary connecting part (12) is located at the center of the primary piston body (11) and extends along the axial direction of the primary piston body (11). The connecting pin (31) is inserted into the primary connecting part (12) on the side close to the primary piston body (11). The primary connecting part (12) on the side away from the primary piston body (11) is connected to the drive mechanism.
3. The piston assembly of claim 2, wherein, The secondary connecting part (22) is located at the center of the secondary piston body (21) and extends along the axial direction of the secondary piston body (21). The connecting pin (31) is inserted into the secondary connecting part (22) on the side away from the secondary piston body (21).
4. The piston assembly of claim 3, wherein, The secondary connecting part (22) includes a connecting arm (221), a first branch (222), and a second branch (223). One end of the connecting arm (221) is connected to the center of the secondary piston body (21). The first branch (222) and the second branch (223) are respectively connected to the other end of the connecting arm (221). The first branch (222) and the second branch (223) are arranged parallel to each other at intervals. The connecting pin (31) is respectively inserted on the side of the first branch (222) and the second branch (223) away from the secondary piston body (21). The primary connecting part (12) is located between the first branch (222) and the second branch (223).
5. The piston assembly of claim 4, wherein, A first needle roller bearing (41) is provided between the first branch (222) and the connecting pin (31), and a second needle roller bearing (42) is provided between the second branch (223) and the connecting pin (31).
6. The piston assembly of claim 4, wherein, The connecting pin (31) is parallel to the radial direction of the first-stage piston body (11) and the second-stage piston body (21), respectively, and the connecting pin (31) is perpendicular to the first-stage connecting part (12) and the second-stage connecting part (22), respectively.
7. The piston assembly of claim 5, wherein, The connecting assembly (30) further includes a bushing (32), which is sleeved outside the connecting pin (31) and located inside the primary connecting part (12), and the bushing (32) is located between the first needle roller bearing (41) and the second needle roller bearing (42).
8. The piston assembly according to claim 1, characterized in that, The first-stage piston body (11) is provided with a first sealing ring (13) on its exterior.
9. The piston assembly according to claim 1, characterized in that, The secondary piston body (21) is provided with a second sealing ring (23) on its exterior.
10. An automotive air compressor, characterized in that, Includes the piston assembly as described in any one of claims 1 to 9.