Patent Application
20240401579
The present invention relates to an electric inflatable pump, and more particularly to a core of a dual-motor-driven inflatable pump that can meet the needs of high output power and high inflation speed.
A conventional inflatable pump is used to inflate objects such as tires of motor vehicles. There are two types of the conventional inflatable pump: manual and electric. A conventional electric inflatable pump is labor-saving and has good inflation efficiency, and is chosen by most motor vehicle drivers.
The conventional electric inflatable pump has a base and a core disposed on the base. The core has a cylinder driven by a single electric motor. Based on cost considerations, electric motors of model numbers RS380, 390, 540 or 550 are generally used. The aforementioned electric motors of model numbers RS380, 390, 540 or 550 are automatic volume products and have low cost.
A core of the conventional electric inflatable pump uses a single electric motor to operate, based on portability and storage, and most of the motor vehicles are general type RVs, etc., the output powers of electric motors of model numbers RS380, 390, 540 or 550 are relatively small, which can meet the needs of use.
With the improvement of people's living standards and economic capabilities, some people like to drive off-road vehicles for outdoor driving activities. However, for four-wheel drive off-road motor vehicles, it is often necessary to adjust the pressure of the tires in response to different environments and road conditions. Therefore, it is often necessary to inflate the tires by an electric inflatable pump. Generally, compared with the tires of common motor vehicles, the tires of the off-road motor vehicles are generally larger in volume, and the requirements for tire inflation pressure are also relatively high. For inflatable objects with large volume and high air pressure requirements, the core of the conventional electric inflatable pump is limited by the output power of the single electric motor, and it is difficult to meet the special inflation requirements. Some people may consider using an electric motor with a larger output power to meet the needs of high output power and high inflation speed. However, the electric motor that meets the requirements of high output power and high inflation speed is not a common electric motor in the industry. The cost of using an electric motor with high output power is several times higher than the cost of using a common electric motor. It is not conducive to the product competitiveness of electric inflatable pumps that meet special inflation needs. Therefore, how to balance performance and economy is an important issue for the development of electric inflatable pumps.
To overcome the shortcomings, the present invention tends to provide a core of a dual-motor-driven inflatable pump, to mitigate or obviate the aforementioned problems.
The main objective of the present invention is to provide a core of a dual-motor-driven inflatable pump that can meet the needs of high output power and high inflation speed.
The core of a dual-motor-driven inflatable pump in accordance with the present invention has a base, a cylinder, two electric motors, and a drive wheel set. The base has an assembly portion, a fixing portion, and a receiving space formed between the assembly portion and the fixing portion. The cylinder is disposed on the base and has a cylinder body, a cylinder head, and a piston rod. The cylinder body is disposed on the fixing portion via the cylinder head. The piston rod is disposed in the cylinder body and extends in the receiving space via the fixing portion. The two electric motors are disposed on the assembly portion of the base, and each has a drive shaft extended in the receiving space. The drive wheel set is disposed in the receiving space of the base and has a driven gear and two drive gears engaging with the driven gear. The two electric motors drive the two drive gears to rotate in a same direction to drive the piston rod to move reciprocatingly via the driven gear.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
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The assembly portion 11 has a pivot hole 111 and two through holes 112, 113. The pivot hole 111 is formed through the assembly portion 11 along the Z-axis of the base 10 and communicates with the receiving space 100. The two through holes 112, 113 are formed through the assembly portion 11, are respectively disposed on two sides of the pivot hole 111 along the X-axis of the base 10, and communicate with the receiving space 100. The fixing portion 12 has a via hole 121 formed through the fixing portion 12 along the X-axis of the base 10 and communicating with the receiving space 100.
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Furthermore, the assembly portion 11 has multiple cooling holes 114 formed through the assembling portion 11 to improve the heat dissipation performance of the base 10. The assembly portion 11 has multiple positioning protrusions 14 disposed on two sides of the assembly portion 11 along the Y-axis of the base 10. When the base 10 is assembled in a housing, the positioning protrusions 14 can provide an auxiliary positioning effect to securely install the base 10 in the housing.
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The two electric motors 30A, 30B of the core of the dual-motor-driven inflatable pump of the present invention can be common electric motors, and the output power generated by the two electric motors 30A, 30B is multiplied to achieve large output power and performance of high inflation speed. At the same time, the cost can be controlled at a low level, so that consumers can inflate large-volume, high-pressure tires and other inflatable objects.
When the piston rod 23 is driven to move forward along the X-axis of the base 10 to compress air, due to the reaction force of the air pressure in the cylinder 21, the reaction force will be transmitted to the eccentric shaft 412 of the driven gear 41 via the piston rod 23, which may cause the driven gear 41 to tilt backwards. In the present invention, the core of the dual-motor-driven inflatable pump further utilizes two electric motors 30A, 30B and the drive gears 42A, 42B arranged along the direction of movement of the piston rod 23 of the cylinder 20 (that is, the X-axis of the base 10) are arranged in parallel on the two sides of the driven gear 41, and the driven gear 41 is jointly driven by the two electric motors 30A, 30B via the two drive gears 42A, 42B to drive the piston rod 23 to move reciprocatingly. Then the force of the driven gear 41 driving the reciprocating movement of the piston rod 23 can be balanced, and it is not easy to be skewed, and the smoothness of the movement of the cylinder 20 can be improved, thereby reducing the load and operating current of the inflatable pump in operation, and prolonging service life of the inflatable pump.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
