JPH0244159Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a forced lubrication device that is used in combination with a balancer.
More specifically, the present invention relates to a forced lubrication device for a crankshaft in a reciprocating mechanism having a piston, such as an engine or a compressor.

[Conventional technology and issues]

Conventionally, known lubricating devices for a crankshaft in a reciprocating mechanism using a piston or the like include a splash type that scoops up lubricating oil and a pressure feed type that drives an oil pump.

However, with the splash type, lubricant supply to the inside of the crank pin is uncertain, and with the pressure feed type, lubricant supply is reliable, but requires an oil pump and a device to drive the pump, and not only is the device complicated, but also There were problems such as the need for piping.

In order to solve these problems,
As shown in Publication No. 73295, check valves have been developed that utilize the negative pressure in the crankcase caused by the action of the piston to operate check valves. There were problems such as not necessarily having enough lubricating oil and not having enough lubricating oil. In addition, a U.S. patent has been filed for a balancer installed on the eccentric shaft of the crankshaft.
There is a publication No. 3457804, which aims to balance the dynamics of a single-cylinder engine.

The purpose of this invention is to integrate a balancer and a lubricating device installed on the eccentric shaft of a crankshaft in a crankcase in a reciprocating mechanism such as an engine or a compressor to create a compact device that is simple in structure and reliable. It is an object of the present invention to provide a forced lubrication device that is used in combination with a balancer to perform a lubricating action.

[Means to solve the problem]

The structure of the present invention is that the crankshaft is provided with an eccentric shaft portion that is eccentric to the axis of the crankshaft.
A balancer is inserted into the eccentric shaft part, and an air chamber is integrally formed in one of the balancers and a weight part is integrally formed in the other, and the weight part of the balancer is provided with:
An oil suction passage is provided with one end opening into oil in the crankcase and the other end communicating with the eccentric shaft, so that the crankshaft moves from top dead center to bottom dead center. When the crankshaft rotates, a suction side groove that communicates the air chamber with the suction passage, and an opening between the air chamber and the outer periphery of the crank pin at least while the crankshaft rotates from bottom dead center to top dead center. A discharge side groove is provided which communicates with the lubrication passage.

〔Example〕

An embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a crankshaft 2 in a crankcase 3 and its lubricating device 1, and the reciprocating motion of a piston (not shown) is converted into rotational motion from a crank gear 26 via a crank pin 22 that connects a connecting rod (not shown). I'm taking it out.

The crankshaft 2 includes an eccentric shaft 2 having an eccentric shaft portion 21' eccentric from the crank axis 2' by ε.
1 is fitted with a lubricating device 1 which is also used as a balancer. and the balance weight part 12 of the lubricating device 1
is provided with a balance weight 16, and further has an elongated hole 17 for preventing the lubricating device 1 from rotating due to rotation of the crankshaft 2 relative to a pin 31 fixed to the crankcase 3.

In addition, as a structure for performing lubrication, a crank pin 22 is attached to the eccentric shaft 21 of the crankshaft 2.
A lubrication passage 25 is provided which opens to the eccentric shaft 21 of the crankshaft 2.
It communicates with a discharge side groove 24 provided on the circumferential surface of. An air chamber 11 is provided in the upper part of the forced lubrication device 1 which is used in conjunction with a balancer and which bears an eccentric shaft 21. The air chamber 11 is connected to the discharge side groove 24 only while the piston (crankshaft 2) moves from the bottom dead center to the top dead center. A discharge side groove 24 is provided on about half the circumference of the eccentric shaft 21 so as to communicate with the discharge hole 15 of the air chamber 11 (FIG. 2).

On the other hand, below the forced lubrication device 1 used in combination with a balancer, there is a balancer weight portion 1 extending below the oil level A.
2 is provided, and this balance weight part 12 is provided with a suction passage 14 that opens into the oil stored below the crankcase 3 and communicates with the eccentric shaft 21. A suction side groove 23 communicating with the suction passage 14 is provided (FIG. 3). This suction side groove 23 is connected to the suction hole 13 and the opening of the suction passage 14 so as to communicate with the suction hole 13 of the air chamber 11 only while the piston (crankshaft 2) moves from the top dead center to the bottom dead center. It is provided with a length b that is longer than the circumference a,
In this case, the suction side groove 23 may have a structure as long as it communicates with the suction passage 14, and a separate supply groove may be provided around the entire circumference of the eccentric shaft 21 so that the suction side groove 23 always communicates with the suction side groove 23.

Next, the lubrication effect will be explained. Since the structure is as described above, the piston (crankshaft 2)
When the lubricating oil descends from the top dead center to the bottom dead center, the pressure inside the crankcase 3 becomes positive pressure, so pressure is applied to the oil surface A, and the lubricating oil rises in the suction passage 14 and flows into the suction side groove 23→ Lubricating oil flows into the air chamber 11 in the order of the suction hole 13 and then the air chamber 11. When the piston reaches bottom dead center, the aforementioned circuit is closed and the air chamber 11
The lubricant passage 25 communicates with the piston, and as the piston moves toward the top dead center, the pressure inside the crankcase 3 becomes negative pressure. Side gutter 24 → Oil passage 2
The oil flows out from the oil supply passage 25 opened in the crank pin 22 in the order of 5.
Forcibly lubricate the contact parts of the stove and stove.

Although the embodiment for an engine has been described above, the structure and operation are similar for a reciprocating mechanism having a piston such as a compressor.

[Effect of idea]

As described above, the present invention has the effect that the balancer and the lubricating device are integrated in the crankcase, so that the device is simple and compact.

In addition, since the lubricating oil is forcibly pumped using positive and negative pressure inside the crankcase, sufficient lubricating oil is supplied to the crank pin, ensuring lubrication. Since there is no need to install one, there is no loss of horsepower due to pump drive, the configuration is simple and manufacturing is easy, and since the forced lubrication device can be stored inside the crankcase, the lubrication device is also compact. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a longitudinal sectional view at - in FIG. 1, and FIG. 3 is a longitudinal sectional view at - in FIG. 1. 1... Forced lubrication device, 11... Air chamber, 12...
... Legs, 13 ... Suction holes, 14 ... Suction passages,
15...Discharge hole, 17...Balance weight, 1
8...Long hole, 2...Crankshaft, 21...
Eccentric shaft, 22... Crank pin, 23... Suction side groove, 24... Discharge side groove, 25... Oil supply passage, 3...
...Crankcase, 31...pin.

Claims (1)

[Claims for Utility Model Registration] A crankshaft is provided with an eccentric shaft portion that is eccentric with respect to the axis of the crankshaft, and a balancer is inserted into the eccentric shaft portion, wherein an air chamber is provided on one side of the balancer and a weight is placed on the other side. The weight part of the balancer is integrated with the weight part of the balancer.
An oil suction passage is provided with one end opening into the oil in the crankcase and the other end communicating with the eccentric shaft, and the crankshaft moves from top dead center to bottom dead center on the circumferential surface of the eccentric shaft. When the crankshaft rotates, a suction side groove that communicates the air chamber with the suction passage, and an opening between the air chamber and the outer periphery of the crank pin at least while the crankshaft rotates from bottom dead center to top dead center. A forced lubrication device characterized by having a discharge side groove communicating with a lubrication passage.