Oil-free air pump transmission structure

Abstract

The utility model relates to an oil-free air pump transmission structure which comprises a rotating shaft and a piston, the rotating shaft comprises a base which is fixed or integrally arranged, the base comprises a disc part and a cylindrical part protruding upwards at the center of the disc part, and the upper surface of the disc part is a curved surface. The curved surface fluctuates up and down regularly in the circumferential direction of the rotating shaft, the piston is located on the curved surface, and a rolling piece used for making contact with the curved surface is rotationally arranged at the bottom of the piston. By adopting the technical scheme, the disc part with the regularly fluctuating upper surface is rotated, the rolling piece is arranged on the curved surface, and the rotating piece is arranged in the groove, so that the piston fluctuates up and down along with the curved surface after the piston and the base rotate relatively under the combined action of the groove and the curved surface; the rotation action of the rotating shaft driven by the motor is transmitted into the up-down reciprocating action of the piston.

Description

Technical Field

[0001] The utility model belongs to the technical field of air pumps, and in particular relates to an oil-free air pump transmission structure. Background Art

[0002] An air pump is a device used to compress or extract gas. It is mostly used in air compressors in cars. It mainly uses a piston pump to compress air and provide the required gas for the air compressor. When the engine is started, the electrical system provides electricity to the air pump to start working. The air pump generates air pressure through continuous reciprocating motion of the piston, compresses the air into high-pressure gas, and sends the gas into the air compressor.

[0003] The internal transmission structures (such as pistons, bearings, and vanes) of air pumps currently used in the automotive field on the market are facing severe tests of material durability. Long-term high-load operation leads to accelerated material fatigue and aging, significantly shortening the overall service life of the air pump; in particular, the reciprocating motion mechanism of piston-type air pumps relies on the precise coordination of the eccentric wheel, piston, and connecting rod; however, when the eccentric wheel drives the piston to move in the piston cylinder, the friction on different parts of the surface of the eccentric wheel is different during rotation, which is prone to uneven wear, causing the eccentric wheel to lose balance, increase vibration and noise, and usually require sufficient lubricating oil to reduce friction, which not only affects the operating efficiency of the equipment, but also increases the wear rate and increases maintenance costs.

[0004] To alleviate the above problems, existing solutions often rely on frequent maintenance and lubrication operations, which not only increases operating costs, but may also lead to the accumulation of oil-gas mixtures, further accelerating component aging and reducing service life. This problem is particularly prominent for piston air pumps that require regular refueling. Although the application of air pump technology in the field of air compressors is quite mature, its short service life, easy aging, high maintenance costs and other problems are still prominent, becoming a key factor restricting the further development of the industry. Summary of the Invention

[0005] The purpose of this utility model: In order to overcome the defects of the prior art, the utility model provides an oil-free air pump transmission structure, which solves the problem that the parts of the transmission structure in the air pump are subject to uneven wear and require sufficient lubricating oil to reduce friction, but still have a short life.

[0006] The technical solution of the present utility model is as follows: an oil-free air pump transmission structure, comprising a rotating shaft and a piston, the rotating shaft comprising a fixed or integrally arranged base, the base comprising a disc portion and a cylindrical portion protruding upward at the center of the disc portion, the upper surface of the disc portion being a curved surface, the curved surface undulating regularly up and down along the circumferential direction of the rotating shaft, the piston being on the curved surface, a rolling member for contacting the curved surface being rotatably provided at the bottom of the piston, a rotating member being rotatably provided on the side of the piston close to the cylindrical portion, a groove being provided on the outer circumferential surface of the cylindrical portion for the rotating member to roll, the top surface or bottom surface of the groove being in contact with the rotating member, and when the rotating shaft drives the base to rotate, the piston performs an up and down reciprocating motion under the joint action of the curved surface and the groove.

[0007] According to the above technical solution, by rotating the disc portion with regularly undulating upper surface, placing the rolling element on the curved surface, and arranging the rotating element to move in the top or bottom surface of the groove, the piston is acted upon by the combined action of the groove and the curved surface. After the piston and the base rotate relative to each other, the piston rises and falls together with the curved surface and the top surface of the groove, thereby transmitting the rotational motion of the motor-driven rotating shaft into the up and down reciprocating motion of the piston, thereby realizing the pumping function of the air pump. The overall structure is simple, and the rolling of the rolling element and the rotating element on the base replaces the rotation of the piston connecting rod and eccentric wheel in the prior art, thereby converting the large rotational friction into extremely small rolling friction. In addition, the base and the rotating shaft replace the connecting rod, piston pin, piston pin bearing, and eccentric wheel in the traditional piston transmission structure that are subject to uneven wear and short life. Therefore, there is no need to apply lubricating oil, thereby avoiding the situation where the eccentric wheel loses balance due to uneven wear, generates large vibration and noise, thereby extending the service life of the air pump transmission structure, and can greatly reduce the use of lubricating oil and friction loss, so that the transmission structure can more effectively convert energy.

[0008] The present invention is further configured as follows: the curved surface is uniformly undulating in the circumferential direction around the rotation axis, and at least two pistons are uniformly distributed on the curved surface.

[0009] With the above further arrangement, the curved surface undulates evenly in the circumferential direction, and the pistons are evenly distributed on the curved surface, so that the force on the rotating shaft is more balanced, preventing a single piston or unevenly arranged pistons from causing the base to tilt toward the heavier side, resulting in uneven force on the rotating shaft and increased probability of damage.

[0010] The present invention is further provided with an air passage extending between the top and bottom of the piston, and the piston includes a one-way valve provided at the top of the air passage.

[0011] With the above-mentioned further arrangement, the piston can be set in the piston cylinder, and the air channel can transfer the gas below to the bottom of the one-way valve. The movement of the piston changes the air pressure in the piston cylinder, forming an air pressure difference on the upper and lower sides of the one-way valve, thereby lifting the one-way valve switch and allowing the gas to flow to the top of the one-way valve.

[0012] The present invention is further configured as follows: a connecting shaft is passed through the bottom of the piston, and the rolling element and the rotating element are both rotatably connected to the connecting shaft.

[0013] By adopting the above-mentioned further arrangement, the rotating part and each rolling part can rotate relatively independently, and can all roll on the curved surface, and ensure that when the base rotates through a certain angle, the rolling parts at different positions can roll different distances, preventing sliding between the rolling parts and the curved surface, generating greater friction, accelerating the wear of the rolling parts and the rotating parts, causing the piston to tilt outward and increasing maintenance costs.

[0014] A further configuration of the present invention is that the top surface and the bottom surface of the groove rise and fall together with the curved surface.

[0015] With the above further arrangement, the top and bottom surfaces of the groove both rise and fall together with the curved surface, so that the rotating member arranged in the groove rises and falls with the groove and rises and falls synchronously with the piston, further ensuring that the rolling member can move along the curved surface.

[0016] A further configuration of the present invention is that a fitting gap is left between the groove and the rotating member in the linear direction of the piston movement.

[0017] The above further arrangement ensures that the rotating member can roll in the groove, while preventing the rotating member from generating loud noise when moving in the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a specific embodiment of the utility model;

[0019] Figure 2 This is a structural diagram of the base and the rotating shaft in a specific embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the cooperation between the rolling element and the groove in a specific embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the cooperation between the piston and the transmission structure on the piston in a specific embodiment of the present utility model.

[0022] In the figure: 1, rotating shaft; 2, piston; 21, air channel; 3, base; 30, disc part; 31, curved surface; 32, cylindrical part; 33, groove; 4, one-way valve; 5, rolling element; 6, connecting shaft; 7, rotating part. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being described. In the description of this utility model, "several" means at least two, such as two or three, unless otherwise specifically defined.

[0026] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that technical personnel in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0027] like Figure 1-4 As shown, an oil-free air pump transmission structure includes a rotating shaft 1, a piston 2, and a base 3. The base 3 includes a disc portion 30 and a cylindrical portion 32 protruding upward at the center of the disc portion 30. In this embodiment, the rotating shaft 1 and the base 3 are separately provided and fixedly connected to the base 3. It should be noted that the rotating shaft 1 and the base 3 can also have the same technical effect if they are provided as one body. The central axes of the rotating shaft 1, the disc portion 30, and the cylindrical portion 32 are the same.

[0028] The upper surface of the disc portion 30 is a curved surface 31, which rises and falls regularly and evenly along the circumferential direction of the rotating shaft 1. At least two pistons 2 are arranged on the curved surface 31. In this embodiment, four pistons 2 are preferably arranged. The four pistons 2 are evenly distributed on the curved surface 31. In this embodiment, the curved surface 31 includes two evenly arranged peaks and two valleys. The peaks and valleys are arranged in sequence along the circumferential direction of the rotating shaft 1, and there is a smooth transition between the peaks and valleys. The evenly arranged base 3 and piston 2 make the force on the rotating shaft 1 more balanced, preventing the use of a single piston 2 or an unevenly arranged piston 2 on the base 3 or an unevenly undulating base 3, which causes the base 3 to tilt toward the heavier side, resulting in uneven force on the rotating shaft 1 and accelerated wear of the rotating shaft 1.

[0029] Each piston 2 is provided with a rolling element 5 at the bottom. There can be multiple rolling elements 5. In this embodiment, the bottom of each piston 2 includes two evenly distributed wheel grooves. The two wheel grooves are provided with rolling elements 5. The two rolling elements 5 are rotatably connected to the piston 2 through a connecting shaft 6. The connecting shaft 6 is passed through the bottom of the piston 2 and fixedly connected to avoid friction caused by the rotation of the connecting shaft 6 and the piston 2. The rolling elements 5 and the connecting shaft 6 can be rotatably connected through bearings.

[0030] When the rolling element 5 contacts the curved surface 31, the piston 2 is supported evenly and does not tilt to one side. Each rolling element 5 can rotate relatively independently and roll on the curved surface 31. It is ensured that when the base 3 rotates through a certain angle, the rolling elements 5 at different positions can roll different distances, preventing sliding between the outer rolling element 5 and the curved surface 31, which would cause wear and cause the piston 2 to tilt outward.

[0031] The connecting shaft 6 passes through the piston 2 and extends toward the side close to the cylindrical portion 32. The portion thereof extending outside the piston 2 is rotatably connected to a rotating member 7. The rotating member 7 and the connecting shaft 6 can also be rotatably connected via a bearing. Both the rotating member 7 and the rolling member 5 can be rollers.

[0032] A groove 33 is provided on the outer circumference of the cylindrical portion 32 for the rotating member 7 to roll. The distance between the top and bottom surfaces of the groove 33 is greater than the diameter of the rotating member 7, so that the rotating member 7 only contacts the top or bottom surface of the groove 33 at the same time.

[0033] It should be noted that in actual use, the width of the groove 33 is slightly larger than the diameter of the rotating member 7, leaving sufficient clearance for the rotating member 7 to roll in the groove 33. This clearance is preferably no larger than 20 threads, ensuring that the rotating member 7 can roll in the groove 33 while avoiding the generation of loud noise when the rotating member 7 moves in the groove 33.

[0034] Furthermore, the top and bottom surfaces of the groove 33 rise and fall together with the curved surface 31, and the bottom surface of the groove 33 coincides with or is above the curved surface 31. In this embodiment, the curved surface 31 is used as the bottom surface of the groove 33, which facilitates the processing and forming of the base 3 and avoids the situation where the bottom surface of the groove 33 and the curved surface 31 do not rise and fall together.

[0035] It should be noted that when the bottom surface of the groove 33 and the curved surface 31 are different surfaces, the bottom surface of the groove 33 can only be above the curved surface 31, and the rotating member 7 is rotatably arranged with the connecting shaft 6 and is coaxial with the rolling member 5. The diameter size of the rotating member 7 is sufficient to leave a fitting gap between the top surface and the bottom surface of the groove 33.

[0036] The piston 2 and the base 3 can move relative to each other. When the rotating shaft 1 drives the base 3 to rotate, the peaks and valleys on the curved surface 31 pass through each piston 2 in sequence, and each piston 2 rises and falls with the curved surface 31. When the piston 2 moves upward, the rolling element 5 is squeezed upward by the curved surface 31, and the rolling element 5 contacts and rolls on the curved surface 31. At the same time, the rotating element 7 is squeezed upward by the bottom surface of the groove 33 and rolls on it. When the piston 2 moves downward, the rotating element 7 is pushed downward by the top surface of the groove 33, and the rotating element 7 contacts and rolls on the top surface of the groove 33.

[0037] In this way, the rotational motion of the rotating shaft 1 is transmitted to the up and down motion of the piston 2, and the rotation of the motor is converted into the up and down reciprocating motion of the piston 2. The overall structure is simple. Compared with the traditional crank-connecting rod structure, the device eliminates the transmission structure between the connecting rod, piston pin, piston pin bearing and eccentric wheel by rolling the rolling member 5 and the rotating member 7 on the base 3, and optimizes the friction between the connecting rod and the eccentric wheel to the rolling friction between the rolling member 5 and the curved surface 31, which greatly reduces the friction. There is no need for a transmission structure of the connecting rod, piston pin, piston pin bearing and eccentric wheel that is subject to large impact force and short life. Therefore, there is no need to use lubricating oil to lubricate them, thereby extending the life of the air pump transmission structure.

[0038] An air passage 21 is provided between the top and bottom of the piston 2, and a one-way valve 4 is provided on the top of the air passage 21. The piston 2 is arranged in the piston cylinder. The air passage 21 can transfer the gas below the piston 2 to the bottom of the one-way valve 4, and the movement of the piston 2 can change the air pressure in the piston cylinder, thereby lifting the one-way valve 4 switch, and the gas passes to the top of the one-way valve 4 to realize the function of pumping air.

Claims

1. An oil-free air pump transmission structure, comprising a rotating shaft (1) and a piston (2), characterized in that: The rotating shaft (1) includes a base (3) that is fixed or integrally provided. The base (3) includes a disc portion (30) and a cylindrical portion (32) that is provided at the center of the disc portion (30) and protrudes upward. The upper surface of the disc portion (30) is a curved surface (31). The curved surface (31) rises and falls regularly along the circumferential direction of the rotating shaft (1). The piston (2) is located on the curved surface (31). A rolling member (5) for contacting the curved surface (31) is provided at the bottom of the piston (2). A rotating member (7) is provided on the side of the piston (2) close to the cylindrical portion (32). A groove (33) is provided on the outer circumference of the cylindrical portion (32) for the rotating member (7) to roll. The top surface or bottom surface of the groove (33) contacts the rotating member (7). When the rotating shaft (1) drives the base (3) to rotate, the piston (2) performs an up and down reciprocating motion under the combined action of the curved surface (31) and the groove (33).

2. The oil-free air pump transmission structure according to claim 1, characterized in that: The curved surface (31) is uniformly undulating in a circumferential direction around the rotation axis (1), and at least two pistons (2) are uniformly distributed on the curved surface (31).

3. The oil-free air pump transmission structure according to claim 1 or 2, characterized in that: An air passage (21) is provided between the top and bottom of the piston (2), and the piston (2) includes a one-way valve (4) provided at the top of the air passage (21).

4. The oil-free air pump transmission structure according to claim 1 or 2, characterized in that: A connecting shaft (6) is provided through the bottom of the piston (2), and the rolling element (5) and the rotating element (7) are both rotatably connected to the connecting shaft (6).

5. The oil-free air pump transmission structure according to claim 1, characterized in that: The top surface and the bottom surface of the groove (33) rise and fall together with the curved surface (31).

6. The oil-free air pump transmission structure according to claim 1 or 5, characterized in that: A fitting clearance is left between the groove (33) and the rotating member (7) in the linear direction of movement of the piston (2).

7. The oil-free air pump transmission structure according to claim 5, characterized in that: The bottom surface of the groove (33) coincides with the curved surface (31) or is located above the curved surface (31).

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