A transmission device and an air compressor

Abstract

This invention provides a transmission device and an air compressor. The transmission device includes a crankcase, a motor mounted on one side of the crankcase, and a crankshaft assembly. The motor includes a rotor, and the rotor has a first cavity and a second cavity. The crankshaft assembly includes a crankshaft, one end of which is rotatably disposed in the crankcase, and the other end of which is placed in the first cavity. The second cavity has fasteners that connect to the end face of the crankshaft assembly. This invention optimizes the rotor structure inside the motor by directly setting a first cavity for mounting the crankshaft inside the rotor, so that the crankshaft is directly confined in the first cavity and rotates with the rotor, eliminating the need for a coupling and making installation more convenient.

Description

Technical Field

[0001] This utility model relates to the field of air compressor technology, and in particular to a transmission device and an air compressor. Background Technology

[0002] The working principle of an air compressor is to use an electric motor to drive the crankshaft of the air compressor to rotate, and the piston does work to draw in air and gradually compress it, and finally release the compressed air. It is mainly used in many fields such as industrial production, manufacturing, automobile repair and maintenance, construction sites, medical equipment, food and beverage industry, aerospace, and agriculture.

[0003] The existing air compressor drive methods include the following: (a) Direct drive: For example, a silent air compressor disclosed in patent publication number CN118049360A includes a crankcase and a motor. The crankcase contains a crankshaft, and a coupling connects the motor output shaft to the crankshaft, directly transmitting the motor power to the compressor head through the coupling. Its disadvantage is that it requires the use of a coupling, making the assembly structure relatively complex; (ii) Belt drive: The motor power is transmitted to the machine head using a belt. Its disadvantages are: lower efficiency and the need to replace the belt regularly to adjust the transmission ratio. Utility Model Content

[0004] The purpose of this invention is to provide a transmission device and an air compressor that do not require a coupling or belt replacement.

[0005] The technical solution of this utility model is: a transmission device, including a crankcase, a motor and a crankshaft assembly installed on one side of the crankcase, the motor including a rotor, the rotor having a first cavity and a second cavity, the crankshaft assembly including a crankshaft, one end of the crankshaft being rotatably disposed in the crankcase, the other end of the crankshaft being placed in the first cavity, and the second cavity having fasteners connected to the end face of the crankshaft assembly.

[0006] In the above solution, the rotor structure inside the motor is optimized by directly setting a first cavity inside the rotor for mounting the crankshaft. This allows the crankshaft to be directly confined in the first cavity and rotate with the rotor, eliminating the need for a coupling and making installation more convenient.

[0007] Preferably, one end of the crankshaft is a tapered shaft, and the first cavity is a tapered hole adapted to the tapered shaft.

[0008] Preferably, the crankshaft assembly further includes a key pin, the crankshaft is provided with a first keyway, and the inner wall of the first cavity is provided with a second keyway, the first keyway and the second keyway being aligned to install the key pin.

[0009] Preferably, the crankshaft assembly further includes a first bearing, a first nut, a first locking plate, a second bearing, a second locking plate, and a second nut; one end of the crankshaft is provided with a first journal, and the other end of the crankshaft is provided with a second journal and a third journal. The first journal is fitted with a first bearing adapted to the crankcase, and the first bearing is limited by a first locking plate and a first nut in sequence; the second journal is fitted with a second bearing adapted to the crankcase, and the second bearing is limited by a second locking plate and a second nut in sequence; the third journal is placed in the first cavity.

[0010] Preferably, two second bearings are spaced apart on the second journal, and a first spacer is provided between the two second bearings, and a second spacer is provided between one of the second bearings and the second locking plate.

[0011] Preferably, the crankcase includes an end cover, a housing, and a cover, with the end cover and the cover respectively covering both ends of the housing. One end of the crankshaft is rotatably disposed in the end cover, and the other end of the crankshaft passes through the cover and is placed in the first cavity.

[0012] Preferably, the motor further includes a main body and a tail cover, the rotor is installed inside the main body, one end of the main body is installed on the end face of the crankcase, and the tail cover is provided at the other end of the main body.

[0013] This utility model also provides an air compressor, including two cylinders and the above-mentioned transmission device. The crankcase of the transmission device is provided with two connection interfaces, and the cylinders are installed on the connection interfaces.

[0014] Compared with related technologies, the beneficial effects of this utility model are as follows: 1. Optimize the rotor structure inside the motor by directly setting the first cavity for mounting the crankshaft inside the rotor, so that the crankshaft is directly confined in the first cavity and rotates with the rotor, eliminating the need for a coupling and making installation more convenient; Second, the crankshaft and the first cavity are assembled using key pins and keyways, making the connection structure more stable; Third, the crankshaft is directly connected to the rotor, resulting in low energy consumption, high transmission efficiency, and high lifespan and stability. Attached Figure Description

[0015] Figure 1 An exploded structural diagram of the transmission device provided by this utility model; Figure 2 A cross-sectional structural schematic diagram of the transmission device provided by this utility model; Figure 3 This is an exploded view of the crankcase. Figure 4 This is an exploded view of the crank assembly. Figure 5 This is a schematic diagram of the exploded structure of the motor; Figure 6 This is a partial structural schematic diagram of the air compressor provided by this utility model.

[0016] In the attached diagram: 1. Crankcase; 11. End cover; 12. Housing; 13. Washer; 14. Cover; 15. Connecting interface; 16. Crankshaft cavity; 2. Crankshaft assembly; 21. First bearing; 22. First nut; 23. First locking plate; 24. Crankshaft; 241. First journal; 242. Second journal; 243. Third journal; 244. First keyway; 25. Key pin; 26. Second bearing; 27. First spacer; 28. Second nut; 29. ​​Second spacer; 210. Second locking plate; 3. Motor; 31. Rotor; 311. First cavity; 312. Second cavity; 313. Second keyway; 32. Main body; 33. Fastener; 34. Tail cover; 100. Cylinder block. Detailed Implementation

[0017] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0018] like Figure 1 As shown, this embodiment provides a transmission device consisting of a crankcase 1, a crankshaft assembly 2, and a motor 3.

[0019] like Figure 2 , Figure 3 As shown, the crankcase 1 includes an end cap 11, a housing 12, a washer 13, a cover 14, a connecting interface 15, and a crankshaft cavity 16. The end cap 11 and the cover 14 cover both ends of the housing 12. The crankshaft cavity 16 is provided inside the housing 12, and two connecting interfaces 15 are provided on the top of the housing 12, which communicate with the crankshaft cavity 16. The end cap 11 is installed on one side wall of the housing 12 forming the crankshaft cavity 16.

[0020] like Figure 4 As shown, the crankshaft assembly 2 includes a first bearing 21, a first nut 22, a first locking plate 23, a crankshaft 24, a key pin 25, a second bearing 26, a first spacer 27, a second nut 28, a second spacer 29, and a second locking plate 210. One end of the crankshaft 24 is provided with a first journal 241, and the other end of the crankshaft 24 is provided with a second journal 242 and a third journal 243. The third journal 243 is provided with a first keyway 244. The third journal 243 is a tapered shaft.

[0021] like Figure 2 , Figure 4 As shown, a first bearing 21 adapted to the end cap 11 is fitted onto the first journal 241, and the first bearing 21 is limited in position by a first locking plate 23 and a first nut 22. A second bearing 26 adapted to the crankcase 1 is fitted onto the second journal 242. Two second bearings 26 are spaced apart on the second journal 242, and a first spacer 27 is provided between the two second bearings 26. The outer ring of the second bearing 26 near the third journal 243 is limited by the cover 14, and the inner ring of the second bearing 26 is limited by a second spacer 29. A second locking plate 210 and a second nut 28 are respectively installed on the second journal 242 to limit the position of the second spacer 29.

[0022] like Figure 5 As shown, the motor 3 includes a rotor 31, a body 32, fasteners 33, and a tail cover 34. The rotor 31 is mounted in the body 32. Figure 2 As shown, the rotor 31 has a first cavity 311 and a second cavity 312. The first cavity 311 is a tapered bore, and its inner wall has a second keyway 313. The third journal 243 on the crankshaft 24 is installed in the first cavity 311, and a key pin 25 is installed in the first keyway 244 and the second keyway 313. To facilitate the installation of the key pin 25, the second keyway 313 has a through structure at one end near the large-diameter end of the tapered bore. At the same time, the fastener 33 extends from the second cavity 312 and is fastened to the end of the third journal 243.

[0023] One side of the main body 32 is bolted to the end face of the crankcase 1, and the other side of the main body 32 is bolted to the tail cover 34.

[0024] like Figure 1 As shown, a base is provided at the bottom of the crankcase 1 for fixing the transmission device.

[0025] like Figure 6 As shown, this utility model also provides an air compressor, including two cylinders 100 and the aforementioned transmission device. The cylinders 100 are mounted on the connection interface 15 of the transmission device. A piston is provided inside each cylinder 100, and the piston is connected to the crankshaft 24. The crankshaft 24 drives the piston to reciprocate, thereby achieving gas compression and delivery.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A transmission device, comprising a crankcase (1) and a motor (3) mounted on one side of the crankcase (1), characterized in that, It also includes the crankshaft assembly (2); The motor (3) includes a rotor (31), and the rotor (31) has a first cavity (311) and a second cavity (312); the crankshaft assembly (2) includes a crankshaft (24), one end of the crankshaft (24) is rotatably disposed in the crankcase (1), the other end of the crankshaft (24) is placed in the first cavity (311), and the second cavity (312) is provided with a fastener (33) connected to the end face of the crankshaft assembly (2).

2. The transmission of claim 1, wherein One end of the crankshaft (24) is a tapered shaft, and the first cavity (311) is a tapered hole adapted to the tapered shaft.

3. The transmission of claim 1, wherein The crankshaft assembly (2) also includes a key pin (25), a first keyway (244) is provided on the crankshaft (24), and a second keyway (313) is provided on the inner wall of the first cavity (311). The first keyway (244) and the second keyway (313) are aligned to install the key pin (25).

4. The transmission of claim 1, wherein The crankshaft assembly (2) further includes a first bearing (21), a first nut (22), a first locking plate (23), a second bearing (26), a second locking plate (210), and a second nut (28). One end of the crankshaft (24) is provided with a first journal (241), and the other end of the crankshaft (24) is provided with a second journal (242) and a third journal (243). The first journal (241) is fitted with a first bearing (21) adapted to the crankcase (1), and the first bearing (21) is limited by a first locking plate (23) and a first nut (22) in sequence; the second journal (242) is fitted with a second bearing (26) adapted to the crankcase (1), and the second bearing (26) is limited by a second locking plate (210) and a second nut (28) in sequence; the third journal (243) is placed in the first cavity (311).

5. The transmission of claim 4, wherein, Two second bearings (26) are spaced apart on the second journal (242), and a first spacer (27) is provided between the two second bearings (26). A second spacer (29) is provided between one of the second bearings (26) and the second locking piece (210).

6. A transmission according to any one of claims 1-5, characterised in that The crankcase (1) includes an end cap (11), a housing (12) and a cover (14). The end cap (11) and the cover (14) cover the two ends of the housing (12). One end of the crankshaft (24) is rotatably disposed in the end cap (11), and the other end of the crankshaft (24) passes through the cover (14) and is placed in the first cavity (311).

7. A transmission according to any one of claims 1-5, characterised in that The motor (3) also includes a main body (32) and a tail cover (34). The rotor (31) is installed inside the main body (32). One end of the main body (32) is installed on the end face of the crankcase (1), and the tail cover (34) is provided at the other end of the main body (32).

8. An air compressor comprising two cylinders (100), characterized in that, It also includes a transmission device as described in any one of claims 1-6, wherein the crankcase (1) of the transmission device is provided with two connection interfaces (15), and the cylinder block (100) is mounted on the connection interfaces (15).

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