Crankshaft transmission structure and electric air compressor

Abstract

The utility model provides a crankshaft transmission structure and an electric air compressor, the crankshaft transmission structure is suitable for the electric air compressor, and the crankshaft transmission structure comprises a crankshaft and a motor shaft which are integrally formed; the crankshaft is provided with a connecting rod journal used for being connected with a connecting rod assembly of the electric air compressor. The outer circumferential wall of the shaft end, deviating from the motor shaft, of the crankshaft is sleeved with a balancing weight; the end, close to the crankshaft, of the motor shaft is sleeved with a bearing. The motor shaft is sleeved with a motor rotor. According to the utility model, the crankshaft and the motor shaft are integrally designed, so that the functions of the motor shaft and the crankshaft of the air compressor can be realized at the same time, and meanwhile, the problem of poor coaxiality of the tail end of the crankshaft caused by additional matching of the split type motor shaft and the crankshaft is avoided; according to the electric air compressor, the product structure is simplified, meanwhile, the stability and durability of the electric air compressor during operation are improved, in some embodiments, the balancing weight of the crankshaft can be flexibly arranged, and therefore the problems of rotational inertia, crankshaft vibration and the like of the crankshaft can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric air compressors, in particular to a crankshaft transmission structure and an electric air compressor. Background Art

[0002] The existing electric air compressor motor and air compressor are arranged separately, and the motor and the air compressor crankshaft are connected through couplings, keys, etc. between the motor and the air compressor to transmit torque. The crankshaft is an important component of the air compressor, which is used to transmit the torque transmitted by the engine or electric motor to the piston through the connecting rod to output gas at a certain pressure. The end of the crankshaft of the air compressor requires a bearing at the crankcase to support the crankshaft, so there are high requirements for the coaxiality of the end of the crankshaft. However, the above-mentioned connection and transmission method is very likely to cause poor coaxiality at the end of the electric air compressor crankshaft due to problems with processing technology, assembly technology and component quality, resulting in severe wear at the end bearing position after long-term operation, affecting the durability of the product.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the utility model, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] In response to the problems in the prior art, the purpose of the utility model is to provide a crankshaft transmission structure and an electric air compressor. The crankshaft transmission structure has an integrated crankshaft and motor shaft, and simultaneously serves as the motor shaft and the crankshaft of the air compressor, thereby avoiding the problem of poor coaxiality of the crankshaft end due to additional matching between the split motor shaft and the crankshaft, simplifying the product structure and improving the stability and durability of the electric air compressor during operation.

[0005] A first aspect of the utility model provides a crankshaft transmission structure suitable for an electric air compressor, comprising an integrally formed crankshaft and a motor shaft;

[0006] The crankshaft is provided with a connecting rod journal for assembly connection with a connecting rod of an electric air compressor;

[0007] A counterweight block is sleeved on the outer peripheral wall of the shaft end of the crankshaft away from the motor shaft;

[0008] A bearing is sleeved on one end of the motor shaft close to the crankshaft;

[0009] The motor shaft sleeve is provided with a motor rotor.

[0010] According to the first aspect of the utility model, the crankshaft transmission structure further includes a positioning pin, through which the shaft end of the crankshaft is fixedly connected to the counterweight block.

[0011] According to the first aspect of the utility model, the counterweight block is arranged on the inner arc surface, and the inner arc surface matches the outer peripheral wall of the crankshaft.

[0012] According to a first aspect of the utility model, the counterweight block and the crankshaft are an integral part.

[0013] According to the first aspect of the utility model, the outer peripheral surface of the counterweight block is an arc-shaped surface, and the arc of the arc-shaped surface is equivalent to the curvature of the outer peripheral wall of the crankshaft.

[0014] According to the first aspect of the utility model, the counterweight block is a part of a ring, and the arc center angle corresponding to the ring is between 60 degrees and 120 degrees.

[0015] According to a first aspect of the utility model, the counterweight is made of carbon steel.

[0016] According to a first aspect of the utility model, the bearing is a ball bearing or a roller bearing.

[0017] A second aspect of the utility model provides an electric air compressor, comprising the crankshaft transmission structure.

[0018] The utility model integrates the crankshaft and the motor shaft into an integrated design, which can play the role of both the motor shaft and the crankshaft of the air compressor, while avoiding the problem of poor coaxiality of the crankshaft end due to the additional fit of the split motor shaft and the crankshaft, simplifying the product structure while improving the stability and durability of the electric air compressor during operation. In some embodiments, the counterweight of the crankshaft can be flexibly set, thereby improving problems such as the crankshaft's rotational inertia and crankshaft vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0020] Figure 1 This is a schematic structural diagram of a crankshaft according to an embodiment of the utility model;

[0021] Figure 2 and Figure 3 They are respectively a structural schematic diagram and a cross-sectional diagram of a crankshaft transmission structure of an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the structure of a crankshaft transmission structure according to an embodiment of the present utility model; and

[0023] Figure 5 The figure is a schematic structural diagram of an electric air compressor according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the utility model will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and should not be construed as limitations on the utility model. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0025] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0028] In view of the existing technical problems, the utility model provides a crankshaft transmission structure and an electric air compressor. The crankshaft transmission structure is suitable for an electric air compressor, and includes an integrally formed crankshaft and a motor shaft; the crankshaft is provided with a connecting rod journal for assembly and connection with the connecting rod of the electric air compressor; the outer peripheral wall of the crankshaft end away from the motor shaft is sleeved with a counterweight; the motor shaft is sleeved with a bearing at one end close to the crankshaft; and the motor shaft sleeve is provided with a motor rotor. The utility model integrates the crankshaft and the motor shaft into one design, which can simultaneously play the role of the motor shaft and the crankshaft of the air compressor, while avoiding the problem of poor coaxiality of the crankshaft end caused by the additional matching of the split motor shaft and the crankshaft, simplifying the product structure while improving the stability and durability of the electric air compressor during operation. In some embodiments, the counterweight of the crankshaft can be flexibly set, thereby improving the problems of the rotational inertia and crankshaft vibration of the crankshaft.

[0029] The crankshaft transmission structure and the structure of the electric air compressor of the present utility model are further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the various specific embodiments are not intended to limit the protection scope of the present utility model.

[0030] Figure 1 The present invention is a schematic diagram of a crankshaft transmission structure of an embodiment of the present invention. The crankshaft transmission structure is suitable for an electric air compressor. Specifically, the crankshaft transmission structure includes an integrally formed crankshaft 11 and a motor shaft 12. The crankshaft 11 is provided with a connecting rod journal 111 for assembly and connection with a connecting rod of the electric air compressor, and the connecting rod is connected to a piston. The motor shaft 12 drives the crankshaft 11 to rotate, and the connecting rod journal 111 rotates accordingly to drive the connecting rod to move. The integrally formed crankshaft transmission structure can be obtained by forging or die casting. The integrated crankshaft and motor shaft can simultaneously assume the role of the motor shaft and the crankshaft of the air compressor. More importantly, it can avoid the problem of poor coaxiality of the crankshaft end caused by assembly of the split motor shaft and the crankshaft, thereby reducing the situation of severe wear at the bearing end after the air compressor has been running for a long time. At the same time, it reduces the noise during the operation of the electric air compressor and improves the stability and life of the electric air compressor.

[0031] Figure 2 and Figure 3They are respectively a structural schematic diagram and a cross-sectional diagram of a crankshaft transmission structure of an embodiment of the utility model, in which a counterweight 2 is sleeved on the outer peripheral wall of the axial end of the crankshaft 11 away from the motor shaft 12. The crankshaft transmission structure also includes a positioning pin 21, through which the axial end of the crankshaft 11 is fixedly connected to the counterweight 2. Specifically, the counterweight 2 is arranged on an inner arc surface, and the inner arc surface matches the outer peripheral wall of the crankshaft 11. The outer peripheral surface of the counterweight 2 can also be an arc surface, and the outer arc surface of the counterweight 2 is equivalent to the curvature of the outer peripheral surface of the crankshaft 11 at that location. A through hole for penetrating the positioning pin 21 is provided on the crankshaft 11, and the positioning pin 21 is penetrated through the crankshaft 11 and connects the counterweight 2 to the crankshaft 11. The counterweight provides force balance for the entire electric air compressor during movement, reducing vibration and noise.

[0032] Since the function of the counterweight is to adjust the dynamic balance of the connecting rod connected to the crankshaft 11 and its connecting rod journal 111 during the rotation process, the position and size (shape) of the counterweight can be set according to the crankshaft transmission structure and the structure of the connecting rod connected thereto. In this embodiment, the counterweight can be part of a ring, and the arc center angle corresponding to the ring is set according to the air compressor structure. Preferably, the arc center angle corresponding to the counterweight ring is between 60 degrees and 120 degrees. In this embodiment, the counterweight 2 is detachable, and the detachable connection can improve the flexibility of the crankshaft dynamic balance adjustment, improve the efficiency of the transmission structure debugging, and help reduce the manufacturing cost of the air compressor crankshaft transmission structure. In some embodiments, the counterweight 2 can be made of carbon steel to improve the machinability of the counterweight 50.

[0033] Figure 4 This is a schematic diagram of the structure of the crankshaft transmission structure of another embodiment of the utility model. The crankshaft 11 and the counterweight 2' of this embodiment are an integrated part. The integrated crankshaft transmission structure and the counterweight can also be obtained by forging or mold casting. The above structure can eliminate the assembly process and avoid problems such as coaxiality difference caused by the assembly process. Similarly, the outer arc surface of the counterweight 2' integrated with the crankshaft can be equivalent to the curvature of the outer peripheral surface of the crankshaft 11 at that location. The counterweight can be a part of a ring, and the arc center angle corresponding to the ring is between 60 degrees and 120 degrees. Whether the counterweight adopts a split design or an integral design can also be selected according to the structure of the electric air compressor to which the crankshaft transmission structure is applied.

[0034] like Figure 2 and Figure 3As shown, the crankshaft transmission structure may further include a bearing 3, which is sleeved on one end of the motor shaft 12 close to the crankshaft 11. The bearing 3 may be a ball bearing or a roller bearing. That is, the bearings in the integrated crankshaft transmission structure assembly are not limited to ball bearings, and various motor bearing matching forms such as ball bearing-ball bearing; ball bearing-roller bearing, etc. may be adopted. At the same time, the crankshaft transmission structure may further include a motor rotor 4, which is sleeved on the motor shaft 12. One end of the crankshaft transmission structure equipped with the bearing and the motor rotor is used as the motor shaft.

[0035] The utility model also provides an electric air compressor. Figure 5 This is a schematic structural diagram of an electric air compressor according to an embodiment of the utility model. The electric air compressor includes the crankshaft transmission structure. Figure 4 The crankshaft of the crankshaft transmission structure of the embodiment is accommodated in the crankcase 9, the motor shaft 12 is accommodated in the motor housing 8, and the electric air compressor also includes a motor coil 7 on the outer periphery of the motor rotor 4, and one end of the motor shaft 12 is connected to the motor cover 5 and the motor end cover 6 through the motor bearing 31. When the crankshaft transmission structure is used in the electric air compressor, the connecting rod journal of the crankshaft is connected to the connecting rod (not shown in the figure). The integrated crankshaft transmission structure of the utility model is not limited to the application of the electric air compressor of the above structure, and can also be applied to electric air compressors of other structures, such as oil-containing air compressors, oil-free air compressors, V-type air compressors, W-type air compressors, star-shaped air compressors and parallel multi-cylinder air compressors. The electric air compressor with the one-piece crankshaft transmission structure of the utility model has more stable operation and less noise.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0037] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A crankshaft transmission structure, suitable for an electric air compressor, characterized in that: Includes an integrally formed crankshaft and motor shaft; The crankshaft is provided with a connecting rod journal for assembly connection with a connecting rod of an electric air compressor; A counterweight block is sleeved on the outer peripheral wall of the shaft end of the crankshaft away from the motor shaft; A bearing is sleeved on one end of the motor shaft close to the crankshaft; The motor shaft sleeve is provided with a motor rotor.

2. The crankshaft transmission structure according to claim 1, characterized in that: It also includes a positioning pin, through which the shaft end of the crankshaft is fixedly connected to the counterweight block.

3. The crankshaft transmission structure according to claim 2, characterized in that: The counterweight block is arranged on the inner arc surface, and the inner arc surface matches the outer peripheral wall of the crankshaft.

4. The crankshaft transmission structure according to claim 1, characterized in that: The counterweight and the crankshaft are an integral piece.

5. The crankshaft transmission structure according to claim 2 or 4, characterized in that: The outer peripheral surface of the counterweight block is an arc-shaped surface, and the arc of the arc-shaped surface is equivalent to the curvature of the outer peripheral wall of the crankshaft.

6. The crankshaft transmission structure according to claim 2 or 4, characterized in that: The counterweight block is a part of a ring, and the arc center angle corresponding to the ring is between 60 degrees and 120 degrees.

7. The crankshaft transmission structure according to claim 1, characterized in that: The counterweight is made of carbon steel.

8. The crankshaft transmission structure according to claim 1, characterized in that: The bearing is a ball bearing or a roller bearing.

9. An electric air compressor, characterized in that: A crankshaft transmission structure comprising any one of claims 1 to 8.

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