JPH10159527A - Power take-off mechanism and its lubricating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a lubricating oil forcibly feeding passage and an injection opening, and reduce a cost, by arranging in the inner wall surface of a timing case, a receiving gutter by which lubricating oil is introduced to the inside of the hollow part of a power take-off shaft while arranging a connecting spline groove around the inside of the hollow part of the power take-off shaft. SOLUTION: In a power take-off shaft 3, a spline hole 6 in which a spline groove is formed is arranged in the inside of a cylindrical hollow part. Also, gear transmission means 10 by which the hollow power take-off shaft 3 is connected to a crankshaft, is covered with a timing cover 11 and tightly closed in a timing case 12. At this time, lubricating oil supplied to the gear transmission means 10 is dispersed and stuck to the inner wall surface of the timing case 12, and a part of its lubricating oil S runs down along the inner wall surface of the timing cover 11, goes along the receiving gutter 13, and poured into a penetrating hole 7. Hereby, the lubricating oil is supplied to the spline hole 6 and a spline part 6a, and the lubrication failure of a connecting part to the driving shaft of a cargo handling oil pump can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power take-off mechanism for extracting a rotational force from a crankshaft and a lubrication method therefor.

[0002]

2. Description of the Related Art Conventionally, a power take-off mechanism for taking out the rotation of a crankshaft and driving, for example, an oil pump for cargo handling has been formed integrally with or separately from a crankcase 2 as illustrated in FIG. A radial ball bearing 4 is incorporated in the bearing portion 1, the power take-off shaft 3 is rotatably supported by the radial ball bearing 4, and one end of the power take-off shaft 3 and a crankshaft protruding from the crankcase 2 are formed. For example, the power take-off shaft 3 is connected with a gear transmission means 10 and the gear transmission means 10 is covered with a timing cover 11, and the other end of the power take-off shaft 3 is provided with a drive shaft connection spline hole 6. The lubricating oil is supplied to the radial ball bearing 4 through a lubricating oil pressure passage (not shown) formed in the crankcase 1, while the power take-off shaft is supplied to the spline portion 6a. 3, a through hole 7 communicating with a spline hole 6 formed at the other end is formed through the center of the one end side.
The lubricating oil S is injected from the injection port 16 of the lubricating hydraulic transmission path 15 formed in FIG. 1, and the lubricating oil is supplied to the spline hole 6 through the through hole 7.

[0003]

Normally, the timing cover is thin and is formed separately from the crankcase, and is attached to the wall of the crankcase. When the channel is formed, the timing cover becomes thicker, and it is difficult to lay the pipe on the inner wall surface.In all cases, the lubricating hydraulic channel and the pipe are formed in the crankcase. Ports and joints are required to connect to the lubricating hydraulic transmission path or an oil pipe etc.
As a result, extra steps are required, resulting in an increase in cost. During the operation of the engine, the lubricating oil supplied to the transmission mechanism such as gears is scattered in the timing case covered by the timing cover, and the scattered lubricating oil is directly or transmitted along the wall surface. The lubricating oil that flows down and accumulates at the bottom of the timing case is collected by an oil pump.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a technique for effectively utilizing lubricating oil scattered in a timing case for lubrication of a spline portion. The power take-off shaft is sealed in the timing case including one end of the power take-off shaft to which the rotation transfer means is fixed, and the other end of the power take-off shaft has a spline groove for connection in a hollow portion. A power take-off mechanism provided on the inner wall of the timing case with a receiving gutter for guiding lubricating oil flowing down along the wall into the hollow portion of the power take-off shaft; and a power take-off shaft having a hollow crankshaft. Rotation transmission means for connecting the power take-off shaft to the power take-off shaft. Sealing the timing case including the fixed one end side, lubricating oil attached to the timing case wall surface and flowing down along the wall surface is introduced from one end side of the hollow portion in the power take-off shaft, and the inside of the hollow portion is introduced. This is a lubrication method for supplying to a spline forming portion formed on the other end side. And the timing case is formed by covering the outer wall surface of the crankcase with a timing cover, or the hollow one end side opening portion,
It can be formed to have a small diameter, or a helical groove can be formed on the one end opening side of the hollow in a direction opposite to the rotation direction.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power take-off mechanism and a lubrication method thereof according to the present invention will be described with reference to the drawings. FIG. 1 shows a bearing unit formed integrally with the crankcase 2 at the front end of the side wall surface of the crankcase 2.
The bearing portion 1 has front and rear surfaces opened, and a power take-off shaft 3 is rotatably supported via a radial ball bearing 4 so as to penetrate the bearing portion 1. The power take-off shaft 3 has one end protruding forward from the bearing 1 and a radial hole bearing 4.
A spline hole 6 formed by forming a spline groove in a hollow cylindrical portion is provided at the other end supported by the shaft for connection with the drive shaft 5 of the oil pump. A through hole 7 is formed at one end of the power take-off shuffle 3 so as to communicate with the spline hole 6 at the center, and the spline hole 6 forms a hollow structure with the power take-off shaft. The take-off gear 8 is fixed.

The power take-off gear 8 is disposed between a crank gear fixed to a front end of a crankshaft (not shown) projecting from a front end of the crankcase and the crank gear and the power take-off gear 8. The idle gear 9 constitutes a gear transmission mechanism as rotation transmission means, and the rotation of the crankshaft is transmitted to the power take-off shaft 3 by the gear transmission means 10.

The gear transmission means 10 includes the tip of the crankshaft and one end of the power take-off shaft 3 and is hermetically sealed in a timing case 12 covered by a timing cover 11. Lubricating oil is supplied to the gear transmission means 10 by an appropriate method.

A receiving gutter 13 protrudes from an inner wall of the timing cover 11 at a position corresponding to an extension of the power take-off shaft 3. As shown in FIG. 2, the receiving gutter 13 has guide vanes 13 a, 13 a which are respectively inclined downward from both sides toward the center, and the guide vanes 13 a, 13 a.
and a spout 13b, which is continuous with the guide vanes 13a, 13a from the confluence point a, projects obliquely downward perpendicular to the wall surface, and reaches the inside of a through hole 7 formed at one end of the power take-off shaft 3. The lubricating oil flowing down along the inner wall of the cover 11 is formed to be guided into the through hole 7.

According to the power take-off mechanism formed as described above, the lubricating oil is supplied to the gear transmitting means 10 by an appropriate means by the rotation of the engine, and the supplied lubricating oil is scattered by the rotation of each gear, and the timing is increased. When adhered to the inner wall surface of the case 12, a part of the lubricating oil S flows down along the inner wall surface of the timing cover 11, and
2 and is supplied to the spline portion 6a where the spline hole 6 and the drive shaft 5 fitted in the spline hole 6 are in close contact with each other. Therefore, the lubricating oil does not spread to the spline portion 6a, and the connection portion with the drive shaft of the oil pump for cargo handling does not cause poor lubrication.

In the above embodiment, since the through hole 7 formed at one end of the power take-off shaft has a uniform diameter in the axial direction, a part of the lubricating oil poured flows out from the opening at one end. However, as shown in FIG. 3A, the opening of the through-hole 7 is made small in diameter, the through-hole 7 is formed in a bag shape, and a certain amount of lubricating oil poured into the through-hole 7 is stored therein. As shown in FIG. 3B, the spiral groove 1 in the direction opposite to the rotation direction of the power take-off shaft 3 is formed in the through hole 7.
4, or by forming fins and forcibly sending the lubricating oil toward the other end (spline hole), the lubricating effect can be enhanced.

As shown in FIG. 4A, the receiving trough 13 is designed to collect and supply more lubricating oil by elongating the guide vanes 13a or forming the guide vanes 13a in multiple stages. Alternatively, as shown in FIG.
The lubricating oil can be poured into the through-hole 7 with the force of flowing down without letting the tip end of the through hole 7 enter the through-hole 7. Further, in the embodiment, the case where the drive shaft of the loading oil pump is connected has been described, but it is also possible to use it to drive other equipment driven by the engine, and the bearing portion is connected to the cylinder block. In addition to the one formed integrally, a separate member may be attached with a bolt or the like, and the timing case is formed not only by attaching the timing cover but also integrally with the crankcase. You can do it.

In the power take-off mechanism of the present invention, not only the receiving gutter is formed integrally with the timing cover, but also the timing gutter and the receiving gutter separate from the timing cover may be assembled to the existing timing cover. As the means, a well-known means to which lubricating oil is supplied, such as a chain sprocket, can be used. The lubrication method of the present invention may be used in combination with a conventional lubrication method.

[0013]

According to the power take-off mechanism of the present invention, the lubricating oil pressure passage and the injection port can be made unnecessary only by forming the receiving gutter, which is rational and ideal for reducing the cost. Further, according to the lubrication method of the present invention, the lubricating oil scattered in the timing case is reused for lubrication of the spline portion, so that the lubrication efficiency is excellent.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a power take-off mechanism according to the present invention.

FIG. 2 is an explanatory diagram of a receiving gutter.

FIGS. 3A and 3B are explanatory diagrams each showing a modified example of a through hole.

FIGS. 4A and 4B are explanatory diagrams each showing a modified example of a receiving gutter.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1. Bearing part, 2. Crankcase, 3. Power take-off shaft, 4. Radial ball bearing, 5. Drive shaft, 6. Spline hole, 7. Through hole,
8. Power take-off gear, 9 Idle gear, 1
0: gear transmission means, 11: timing cover, 12
··· Timing case, 13 ··· Receiving gutter, 14 ··· Spiral groove, 15 ··· Lubricating oil pressure passage, 16 ··· Injection port, S.

Claims (5)

[Claims] The power take-off shaft is sealed in a timing case including one end of the power take-off shaft to which the crank shaft and the hollow power take-off shaft are connected. A spline groove for connection is provided in the hollow portion at the other end, while on the inner wall surface of the timing case,
A power take-off mechanism including a receiving gutter for guiding lubricating oil flowing down along the inner wall surface into the hollow portion of the power take-off shaft. 2. The power take-off mechanism according to claim 1, wherein the timing case is formed by covering a timing cover on an outer wall surface of a crankcase. 3. The power take-off mechanism according to claim 1, wherein the hollow one end side opening has a small diameter. 4. The power take-off mechanism according to claim 1, wherein a spiral groove having a direction opposite to a rotational direction is formed on the one end opening side of the hollow. 5. A rotation transmitting means for connecting a hollow power take-off shaft to a crankshaft is hermetically sealed in a timing case including one end to which the power transmitting means for the power take-off shaft is fixed, and is mounted on a wall surface of the timing case. A lubricating method for a power take-off mechanism that introduces lubricating oil that adheres and flows down along the wall surface from one end of a hollow portion of the power take-off shaft, and supplies the lubricating oil to a spline forming portion formed at the other end of the hollow portion .