JPS6272914A - Lubricating device of sel-motor free wheel gear - Google Patents

Abstract

PURPOSE:To simplify the structure of lubricating oil pass system, to improve engine speed, and to reduce the cost of engines by providing a center hole at the center of a crank shaft and connecting one end of it to a radial direction hole heading the inner face of the bearing metal of a free wheel gear and another end to a power source through a choke bore respectively. CONSTITUTION:A crank shaft 1 is provided with a radial direction hole 21 and center hole 22 for metal lubricating and an enlarged opening section 26 at the right end. And an oil introducing bore 29 is provided to a crank shaft 2. One end of the oil introducing bore 19 is connected to an oil pump 34 through an oil sump 31 and oil pass 32, and another end is to the periphery of a crank pin 5 through a choke bore 37, oil introducing bore 38, and choke bore 39. And a part of pressure oil becomes an oil jet 27 through the choke bore 37 and is supplied to the inner face of a bearing metal 13 through the enlarged opening section 26 and center hole 22. The structure of lubricating oil pass system is, thus, so simple that the improvement of engine speed and the cost reduction of engines can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricating device for a cell motor free wheel gear of an engine having a free wheel gear driven by a cell tanabata rotatably on a crankshaft.

(Conventional technique) For example, in a motorcycle engine, a freewheel V17 driven by a starter motor is rotatably supported on the crankshaft via a bearing metal, and this freewheel gear is started via a one-way clutch. It is connected to the crankshaft in such a way that it can apply rotational force to the crankshaft only at certain times. However, since the freewheel gear I is stationary after the engine starts, oil for lubricating the bearing metal must be supplied to the sliding surface between the bearing metal and the rotating crankshaft. Attach an oil collection plate to the side of the freewheel gear,
A system that collects oil droplets in the crank chamber and supplies them to the bearing metal is also used, but this can lead to poor lubrication, especially in high-speed engines such as racers. If the crankshaft bearing near freewheel gear A is metal, pressurized oil is supplied to the oil introduction hole in the crankshaft through this metal part, and oil is supplied to the freewheel gear bearing metal from inside the crankshaft. It is possible, but in that case, the oil passage structure in the metal part of the crankshaft bearing will be complicated.

(Purpose of the Invention) The present invention provides a crankshaft bearing and a crankshaft bearing. The purpose of this system is to supply enough oil to the bearing metal of the freewheel gear from within the crankshaft.

(Structure of the Invention) The present invention provides an engine having a freewheel gear driven by a starter motor rotatably in a crankshaft, and a radial hole opening toward the inner circumferential surface of the metal of the freewheel gear V, and a The crankshaft is provided with a central hole that communicates with the other end and opens into a space between adjacent crank arms, and an oil introduction hole that communicates with a pressure source is provided in the center of the other crankshaft across the space. A lubricating device for a cell seven-tough freewheel engine, characterized in that it opens into the space through a throttle hole, and the oil jet ejected from the throttle hole jumps over the space between the crank arms and is injected into the center hole. It is.

(Embodiment) In FIG. 1, the left and right crankshafts 1.2 are each integrally provided with a crank arm 3.4, and both crank arms 3.4 are integrally connected by a crank bin 5. A large end of a connecting rod 7 is rotatably supported on the crankbin 5 via a needle bearing 6. Both left and right crankshafts 1.2 are connected to the crankcase (
(not shown) is rotatably supported by a ball bearing 8.
The cam and balancer drive sprocket 10 are press-fitted onto the left side crankshaft 1, and then the spacer 11 is
The bearing metal 13 on the inner circumference of the freewheel gear 12 driven by a starter motor (not shown) is then rotatably fitted, and the generator 14 is connected to the bolt 15 at the left end of the bearing metal 13. : It is tightly fastened. freewheel gear 1
The outer peripheral surface of the boss cylinder 16 at the center of 2 is the one-way clutch 1
7, and is supported by a coupling 18, which is fixed to the generator 14 with bolts 19. When the freewheel gear 17 is driven in the six directions of the arrow by the starter motor, the one-way clutch 17 drives the generator 14 in the same direction. However, when the engine starts and the generator 14 starts rotating at high speed in the six directions of the arrow, the one-way clutch 17 is activated. Transmission of engine rotation to the freewheel gear 12 is cut off. In the crankshaft 1, facing the inner circumferential surface of the metal 13, there is a radial hole 21 of the metal 81, and a central hole 22 for oil introduction that communicates with the radial hole 21 (a longitudinal hole parallel to the center line). hole)
A screw hole 24 into which the bolt 15 is screwed is formed in the large diameter hole 23 communicating with the left end of the center hole 22, and a screw hole 24 into which the bolt 15 is screwed is formed in the right end facing the space 25 between the crank arms 3 and 4. An open Ic expanded portion 26 is formed, and is unified by this expanded portion 26 so that an oil jet 27, which will be described later, can be received into the center hole 22.

The right crankshaft 2 has an oil introduction hole 29 in the center, and the right end of this oil introduction hole 29 is connected to the clutch cover 3.
The oil reservoir 31 is connected to an oil bomb 34 (pressure source) through an oil passage 32 in the clutch cover 30 and an oil filter 33. 35 is a high pressure oil seal. The left end of the two oil introduction holes is an oil throttle hole 37 (0.8 to 1 m in diameter).
and opens into the space 25 between the crank arms.
It opens on the outer peripheral surface of the crank pin 5 facing the needle bearing 6 through the inclined oil introduction hole 38 and the throttle hole 39.

Next, the operation will be explained. During normal operation after the engine is started, pressurized oil of 9/ci, for example, is supplied to the A-il reservoir 31, and this pressurized oil passes through the oil introduction hole 29.
Most of it is supplied to the needle bearing 6, and the remaining part becomes an oil jet 27 from the oil throttle hole 37 and is ejected into the space 25.
Oil is injected into the center hole 22 from 6, accumulates in the large diameter hole 23 due to inertial force, and is forcibly supplied from the radial hole 21 to the inner circumferential surface of the bearing metal 13 due to centrifugal force.

(Effects of the Invention) As explained above, according to Kokumitsu, the pressurized oil in the oil introduction hole 29 of the crankshaft 11 foot 2 on one side of the space 25 between the adjacent crank arms 3.
After that, the oil is injected into the oil introduction center hole 22 of the other crankshaft 1, so the oil is injected into the oil introduction center hole 22 of the other crankshaft 1. The freewheel gear bearing metal 13 is
Oil can be forcibly supplied to the inner circumferential surface of the crankshaft 1 from within the crankshaft 1, and it is only necessary to provide a central hole 22 and radial holes 21 for oil introduction in the crank shirt 1-1. This not only simplifies the construction of the oil passage 14 for lubrication of the gear bearing metal 13, but also
The bearing metal 13 is reliably lubricated by using the inertia force and centrifugal force of the oil jet 27.

Also, the center hole 2 for introducing oil from the pole bearing 8 part.
Since it is no longer necessary to supply pressurized oil to the engine 2, a ball bearing 8 can be used instead of the conventional metal one, making it easier to increase the speed of the engine and reduce costs.

(Another Embodiment) As shown in FIG. 2, if a press-fit plug 41 having a throttle hole 37 is adopted, there is no need to directly drill a small-diameter oil throttle hole 37 in the comparatively large crankshaft 1° throat 2.
Processing costs are reduced. Note that the present invention is equally applicable to multi-cylinder engines.

[Brief explanation of drawings]

Claims (4)

[Claims] (1) In an engine having a freewheel gear driven by a starter motor and rotatably mounted on the crankshaft,
The crankshaft is provided with a radial hole that opens toward the inner circumferential surface of the metal of the freewheel gear, and a center hole that communicates with the radial hole and whose other end opens into the space between adjacent crank arms, separating the space. An oil introduction hole communicating with a pressure source is provided at the center of the other crankshaft, and the oil introduction hole is opened into the above space through a throttle hole, and the oil jet ejected from the throttle hole jumps over the space between the crank arms and flows into the center hole. A lubricating device for a cell motor freewheel gear, characterized in that the lubricating device is injected into the motor. (2) The lubricating device for a starter motor freewheel gear according to claim 1, wherein the oil introduction hole opposite the throttle hole opens at the end of the crankshaft and is connected from there to a pressurized oil supply source. (3) The lubricating device for a starter motor freewheel gear according to claim 1, wherein the center hole has an enlarged portion for receiving an oil jet at the end opposite to the oil throttle hole. (4) The lubricating device for a cell motor freewheel gear according to claim 1, wherein the oil throttle hole is formed in the press-fit plug.