JP2587120Y2 - Oil removal device for crankshaft end of internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankshaft oil draining device for an internal combustion engine.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show a conventional crankshaft end oil draining device. FIG. 2 shows an oil draining chamber 01 which shields the gear oil from splashing. FIG. 3 shows a configuration in which oil leakage is collected in the crankcase through an oil seal 02.
And formed so as to prevent oil leakage from the portion.

[0003]

However, in the first conventional example shown in FIG. 2, since the discharge port of the oil drain chamber 01 is opened directly into the crank chamber, oil due to the internal pressure of the crank chamber is drained from the discharge port. There is a drawback that it flows backward into the chamber 01. FIG. 3
In the second conventional example, since the splash of gear lubrication directly hits the shaft end, there is a drawback that if the wear of the oil seal 02 progresses, oil sealing becomes difficult. As described above, in the trunk piston type internal combustion engine, in these conventional devices, the internal pressure of the crank chamber becomes high, so that it is difficult to prevent oil from being blown out due to the internal pressure from the crankshaft through portion.

An object of the present invention is to provide two oil drainage chambers behind a crankshaft in an engine in which a crankshaft bearing is not provided on the end face side of a crankshaft of a camshaft drive gear chamber, and to drain oil by internal pressure of the crankcase. An object of the present invention is to provide a crankshaft end oil draining device for an internal combustion engine that prevents backflow into a chamber and enables oil to be recovered in a crank chamber 6.

[0005] A crankshaft oil draining device for an internal combustion engine according to the present invention is an internal combustion engine that does not have a bearing for supporting the crankshaft at the end of the crankshaft output shaft of a camshaft driving gear chamber. A first oil drain chamber 1 that shields the oil lubrication splash provided in the first oil drain chamber, and a second oil drain chamber 2 that is provided at least one at the outer periphery of the shaft end behind the first oil drain chamber 1. U-shaped pipes 3 and 4 for connecting the oil discharge ports of the oil drain chambers 1 and 2 and the crank chamber 6 respectively,
The U-shaped pipes 3 and 4 prevent the oil from flowing back into the oil drainage chambers 1 and 2 due to the internal pressure of the crank chamber, and enter the first and second oil drainage chambers 1 and 2 into the crank chamber. The oil is configured to be recoverable.

[0006]

The oil that has entered the first oil draining chamber 1 separated from the crank chamber 6 and the gear chamber 7 by the oil draining ring 5 that rotates together with the crankshaft, as shown in FIG. , And accumulates in the U-tube 3, and the differential pressure H ₁ with the crank chamber 6
Is discharged into the crank chamber 6 while maintaining the pressure. Then the oil leaked from the minute gap between the gear case 8 and the crankshaft 9, reservoir below the U-shaped tube 4 is recovered into the second oil thrower chamber 2, a differential pressure of H ₂ and the crank chamber 6 It is discharged into the crank chamber 6 while keeping it. The oil in the U-shaped tubes 3 and 4 is prevented from flowing back into the first and second oil draining chambers 1 and 2 due to the internal pressure of the crank chamber 6. Oil leakage from the 10 is prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. This embodiment is a crankshaft end oil draining device applied to an internal combustion engine in which a crankshaft bearing is not provided on the crank output shaft end side of the (camshaft drive) gear chamber 7. In the figure, reference numeral 1 denotes a (first) oil drain chamber for shielding splashes of gear lubrication, 2
Is a (second) oil drain chamber provided at the rear end of the shaft, 3 and 4 are U-shaped pipes respectively attached to the oil drain chambers 1 and 2, and 5 is an oil drain provided on the crankshaft. Ring, 6
Is a crank chamber, 7 is a gear chamber for accommodating a gear for driving a camshaft or the like, 8 is a gear casing covering the gear chamber, 9 is a crankshaft, and 10 is a shaft penetrating portion.

Next, the operation of the above embodiment will be described.
During the operation of the engine, the internal pressure of the crank chamber 6 increases due to blow-by or the like. As a result, the lubricating oil tends to leak from behind the output side of the crankshaft 9. The oil that has entered the oil drain chamber 1 separated from the crank chamber 6 and the gear chamber 7 by the oil drain ring 5 that rotates together with the crank shaft 9 removes the oil from the lower U-shaped pipe 3.
And is discharged into the crank chamber 6 while maintaining the differential pressure H ₁ with the crank chamber 6.

Next, the oil leaking from the minute gap between the gear casing 8 and the crankshaft 9 is collected in the oil draining chamber 2 and accumulated in the lower U-shaped pipe 4 to reduce the pressure difference H ₂ from the crank chamber 6. It is discharged into the crankcase 6 while keeping it. In addition, U-shaped tube 3,
The oil in the oil draining chamber 4 is generated by the oil in the crank chamber 6.
2 to prevent reverse flow into the shaft penetration part 1
Oil leakage from zero can be prevented.

[0010]

According to the present invention, the following effects can be expected. (1) Since the first and second oil draining chambers and the crank chamber are connected via the U-shaped pipe, there is no reverse flow of oil into the oil draining chamber due to the internal pressure of the crank chamber, and the oil flows into the crank chamber. Since the oil can be discharged smoothly, an oil discharging device to the outside of the crank chamber is not required. (2) Despite the elimination of the crankshaft bearing at the end and the shortening of the engine frame main body, it is possible to prevent oil from being blown out of the shaft penetration portion 10 by gear lubrication.

[Brief description of the drawings]

FIG. 1 is a diagram of an oil draining device according to a first embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 of a first conventional example.

FIG. 3 is a diagram corresponding to FIG. 1 of a second conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil drain chamber, 2 ... Oil drain chamber, 3 ... U-shaped pipe, 4 ... U-shaped pipe, 5 ... Oil drain ring, 6 ... Crank chamber, 7 ... Gear chamber,
8: Gear casing, 9: Crank shaft, 10: Shaft penetrating part, 01: Oil drain chamber, 02: Oil seal.

Claims (1)

(57) [Scope of request for utility model registration] 1. An internal combustion engine having no bearing for supporting a crankshaft on a crankshaft output shaft end side of a camshaft drive gear chamber, wherein a first oil lubrication splash provided on an output outer periphery of the crankshaft is shielded. Oil drain chamber (1), at least one second oil drain chamber (2) provided on the outer periphery of the shaft end behind the first oil drain chamber (1), and each of the oil drain chambers ( 1),
It has U-shaped pipes (3) and (4) respectively connecting the oil discharge port of (2) and the crank chamber (6), and the U-shaped pipes (3) and (4) provide In addition to preventing reverse flow of oil into the oil drain chambers (1) and (2) due to the internal pressure of the crank chamber, the first and second oil drain chambers (1) and (2) enter the crank chamber.
(2) A crankshaft end oil draining device for an internal combustion engine configured to be able to recover the oil inside.