Air compressor with improved rotating device

Patent metadata

Field	Value
Publication number	US-9945369-B2
Application number	US-201514706974-A
Country	US
Kind code	B2
Filing date	May 8, 2015
Priority date	May 15, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

An air compressor includes a rotating device pivotally connected to a piston body. The rotating device includes a gear body and a counterweight. The gear body is formed together with a counterweight, wherein the counterweight is provided with a crankshaft corresponding to the center of the gear body and a crankpin placed at a distance from the crankshaft. The counterweight is horizontally divided into two integrally formed halves, including a left half and a right half, with a common line connected between the center of the crankshaft and the center of the crankpin, wherein the left half has a weight different from the right half, so that the piston body gathers more rotational momentum from the counterweight at BDC to facilitate upstrokes, so that the piston body can conduct reciprocating motion more smoothly, and thus the service life of the air compressor can be increased.

First claim

I claim:

1. In an air compressor including a main frame provided with a cylinder and a motor, the cylinder being fitted with a piston body, the motor capable of driving a rotating device to have the piston body conduct reciprocating motion in the cylinder, the rotating device including a gear body that is assembled with a counterweight provided with a central axle corresponding to the center of the gear body and a crankpin placed at a distance from the central axle, so that the gear body and the counterweight rotates about the central axle, wherein the improvement comprises:
the counterweight is horizontally divided into two integrally formed halves, including a left half and a right half, with a common line connected between the center of the central axle and the center of the crankpin, the left half having a weight different from the right half, whereby the piston body will gather more rotational momentum from the counterweight at BDC to facilitate upstrokes, so that the piston body can conduct reciprocating motion more smoothly.

2. The air compressor of claim 1 , wherein the counterweight and the crankpin are made of metal, and the gear body is formed by plastic molding process together with the counterweight and the crankpin.

3. The air compressor of claim 2 , wherein the central axle of the counterweight of the rotating device is mounted to an axle hole of the main frame, so that the motor can drive the rotating device to rotate about the axle hole.

4. The air compressor of claim 3 , wherein a pinion is fitted on an output axle of the motor, and the gear body of the rotating device is engaged with the pinion, so that the motor can drive the rotating device to have the piston body conduct reciprocating motion in the cylinder.

5. The air compressor of claim 4 , wherein the gear body defines a central through hole, the counterweight is formed together with the gear body such that the central axle extends out of the central through hole of the gear body to be mounted to the axle hole of the main frame, so that the rotating device can rotate about the axle hole of the main frame.

6. The air compressor claim 5 , wherein the counterweight is vertically divided into two integrally formed portions including an upper portion and a lower portion, the lower portion having a dimension greater than the upper portion to form an extension beyond the upper portion, the counterweight being provided at the bottom of the lower portion with two integrally formed steps, including a first step and a second step, wherein the first step is formed on the bottom of the lower portion, the second step is formed on the first step, and the central axle is formed on the second step, the counterweight defining at the bottom of the lower portion a first recess next to the central axle and defining a first through hole at the bottom of the first recess, the first and second steps defining a curved recess facing towards the first recess; the gear body defining at its top an integral inner space including an upper inner space and a lower inner space, wherein the upper inner space corresponds to the upper portion of the counterweight, the lower inner space corresponds to the lower portion of the counterweight, and the central through hole is defined at the bottom of the lower inner space and corresponds to the first step of the counterweight, the gear body further defining at the bottom of the lower inner space a second through hole to be aligned with the first through hole of the counterweight for allowing the crankpin to be fitted into the first and second through holes; wherein the counterweight is assembled into and formed together with the gear body by mating the upper portion, the low lower portion, and the first step of the counterweight respectively with the upper inner space, the lower inner space, and the central through hole, whereby the second step and the central axle of the counterweight extends out of the central through hole of the gear body to be mounted to the axle hole of the main frame.

7. The air compressor of claim 6 , wherein the inner surface of the second through hole is provided with an annular protrusion, and the crankpin defines an annular groove at one end, corresponding to the annular protrusion; wherein the annular protrusion is engaged with the annular groove; the end of the crankpin, adjacent to the annular groove, is in flush with the bottom of the gear body while the other end of the crankpin extends out of the first through hole of the counterweight to be pivotally connected to the piston body.

8. The air compressor of claim 7 , wherein the left half of the counterweight and the right half of the counterweight are in shape asymmetric about the common line, so that the left half has a weight different from the left right half.

9. The air compressor of claim 8 , wherein the counterweight defines a second recess at the bottom of the lower portion; wherein if the rotating device is configured to rotate clockwise, the second recess is located substantially at the right half of the counterweight to reduce the weight of the right half, so that the left half is heavier than the right half to facilitate upstrokes of the piston body; if the rotating device is configured to rotate counterclockwise, the second recess is located substantially at the left half of the counterweight to reduce the weight of the left half, so that the right half is heavier than the left half to facilitate upstrokes of the piston body.

10. The air compressor of claim 7 , wherein the left half of the counterweight and the right half of the counterweight are in shape symmetrical about the common line, and the counterweight defines a second recess at the bottom of the lower portion; wherein if the rotating device is configured to rotate clockwise, the second recess is located substantially at the right half of the counterweight to reduce the weight of the right half of the counterweight, so that the left half is heavier than the right half to facilitate upstrokes of the piston body; if the rotating device is configured to rotate counterclockwise, the second recess is located substantially at the left half of the counterweight to reduce the weight of the left half of the counterweight, so that the right half is heavier than the left half to facilitate upstrokes of the piston body.

Assignees

• Chou Wen San

Inventors

• Chou Wen-San

Classifications

• F04B35/04

  the means being electric · CPC title

• F04B39/0022 Primary

  piston rods · CPC title

• F16C3/30

  with arrangements for overcoming dead-centres · CPC title

• F04B39/122

  Cylinder block · CPC title

• Y10T74/2183

  Counterbalanced · CPC title