JP2009121556A - Lubricant oil feeding device to power transfer shaft in transmission case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely feed lubrication oil to a bearing part in a transmission case (rudder frame 8, 10) built-in with a movement mechanism (crankshaft 5) and provided at a bottom with a bearing part 21 for a power transfer shaft 20 vertically passing through the case. <P>SOLUTION: An oil sump chamber 24, in which the lubrication oil spattered in the transmission case jumps, is concavely formed in an end surface 20a at an upper end of the power transfer shaft into the transmission case. At least one oil passage 25 is provided in the power transfer shaft to extend radially outward from the oil sump chamber toward the bearing part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, for example, in a transmission case incorporating various motion mechanisms such as a crankcase or a transmission case in an internal combustion engine, the bottom of the transmission case is vertically penetrated and axially supported. The present invention relates to a lubricant supply device for a power transmission shaft.

In the various transmission cases described above, the supply of the lubricating oil to the bearing portion of the shaft penetrating therethrough is forcibly supplied by the pump as described in Patent Documents 1 and 2, for example. There were a forced oil supply method and a natural oil supply method in which the lubricating oil in the transmission case was guided to the bearing portion by a natural flow.
JP 2007-1113780 A JP 2007-139036 A

  However, the forced lubrication method using the former lubricating oil pump can achieve a reliable supply of lubricating oil to the bearing part, but in addition to the need for the lubricating oil pump, the transmission case can be connected to the lubricating oil pump from the lubricating oil pump. Since a complicated oil supply passage to the bearing must be drilled, this may lead to a significant increase in manufacturing costs and an increase in the size of the transmission case, and power loss increases due to the drive of the lubricating oil pump. In addition, there is a problem that the risk of oil leakage is high.

  On the other hand, the latter natural lubrication method does not have the above-mentioned problems, but the problem is that the supply of lubricating oil to the bearings tends to be unstable and insufficient, and cannot be applied when the bearing load is large. was there.

  The present invention pays attention to the fact that the lubricating oil is scattered in the various transmission cases described above by the operation of the motion mechanism incorporated in the transmission case, and this is utilized for the bottom of the transmission case. A technical problem is to reliably supply the lubricating oil to the bearing portion of the vertical axis that penetrates in the vertical direction.

In order to achieve this technical problem, claim 1 of the present invention provides:
“In a transmission case with a built-in motion mechanism and a bearing portion for the power transmission shaft that penetrates the bottom in the vertical direction,
An oil reservoir chamber is formed in the end face at the upper end of the longitudinal power transmission shaft into the transmission case so that the lubricating oil scattered in the transmission case is dented, and the power transmission shaft In addition, at least one oil passage is provided so as to extend outward in the radial direction from the oil reservoir chamber toward the bearing portion. "
It is characterized by that.

Claim 2 of the present invention includes:
“In the first aspect of the present invention, an upward funnel-shaped enlarged opening is provided in the upper part of the oil sump chamber.”
It is characterized by that.

Claim 3 of the present invention provides:
“In the first or second aspect of the present invention, an enlarged portion having an inner diameter is provided in an opening portion of the oil passage into the oil sump chamber.”
It is characterized by that.

  According to the configuration described in claim 1, a part of the lubricating oil scattered in the transmission case jumps into the oil sump chamber formed in the end surface at the upper end of the power transmission shaft and accumulates therein. Since the lubricating oil accumulated in the oil sump chamber passes through the oil passage, it is spouted outward in the radial direction by the centrifugal force generated by the rotation of the power transmission shaft. Forcibly supplied.

  Accordingly, the lubricant oil can be reliably supplied to the bearing portion and can cope with a large bearing load, but the lubricant oil pump and the oil supply passage from the lubricant oil as in the conventional forced oil supply system can be used. This can reduce the cost, reduce size and weight, and reduce oil leakage.

  According to the configuration described in claim 2, the amount of lubricating oil that jumps into the oil sump chamber can be increased in the upward funnel-shaped enlarged opening, so that the amount of lubricating oil supplied to the bearing portion can be increased. Can be planned.

  Furthermore, according to the configuration described in claim 3, since the inlet resistance when the lubricating oil flows into the oil passage from the oil reservoir chamber can be reduced at the enlarged inner diameter portion, the above-described effect can be promoted.

  Hereinafter, drawings (FIGS. 1 to 6) when an embodiment of the present invention is applied to an internal combustion engine will be described.

  In these drawings, reference numeral 1 denotes a multi-cylinder internal combustion engine 1, and this multi-cylinder internal combustion engine 1 includes a cylinder block 2 in which a plurality of cylinders 3 are arranged in a row, , A crankcase 4 is integrally provided, and a crankshaft 5 rotating in a direction indicated by an arrow A in FIG. The piston 6 in each cylinder 3 is connected to the crankshaft 5 via a rod 7 so as to reciprocate as the crankshaft 5 rotates.

  A ladder frame 8 configured in a frame shape so as to surround the periphery of the lower surface is removably joined to the lower surface of the crankcase 4 by fastening a plurality of bolts 9 disposed around the ladder frame 8. The bottom member 10 constituting the bottom of the ladder frame 8 is detachably joined to the lower surface of the ladder frame 8 by fastening a plurality of bolts 11 arranged around the bottom member 10. Of the lower surface of the bottom member 10, a portion of the crankshaft 5 on one end side is configured such that lubricating oil supplied to various operating parts of the internal combustion engine 1 returns through the opening 10a. The oil pan 12 is detachably joined by fastening a plurality of bolts (not shown) disposed around the oil pan 12.

  The lateral crankshaft 5 in the crankcase 4 is pivotally supported at a plurality of locations including both end portions in the row direction of the cylinders 3 and portions between the cylinders 3.

  That is, both ends of the crankshaft 5 have upper half bearing portions 13 and 14 integrally provided in the crankcase 4 and lower half bearing portions 15 integrally provided in the ladder frame 8. 16 and a portion between the cylinders 3 of the crankshaft 5 is an upper half bearing portion 17 provided integrally with a portion of the crankcase 4 between the cylinders 3; The ladder frame 8 is pivotally supported by a lower half bearing portion 18 provided integrally therewith.

  In this case, the lower half bearing portions 15, 16, 18 in the ladder frame 8 can be attached to and detached from the upper half bearing portions 13, 14, 17 in the crankcase 4 with at least two bolts 19. It is concluded to.

  As is well known in the art, the internal combustion engine 1 is supplied with lubricating oil in the oil pan 12 inside the crankcase 4 or the ladder frame 8 (not shown). 3 is provided with a mechanism for splashing and supplying oil to the piston 6, and lubricating oil splashed and supplied to each piston 6 and oil supply to each bearing portion of the crankshaft 5. All of the lubricating oil and the lubricating oil supplied to the other operating parts are configured to return into the oil pan 12 from the opening 10a in the bottom member 10.

  That is, when the crankshaft 5 rotates in the direction of the arrow A, the lubricating oil forcedly supplied to each piston 6 and the crankshaft 5 accompanies the rotation of the crankshaft 5 and the swinging motion of the rod 7. By being swung around the crankshaft 5 by centrifugal force, the inner surfaces of the long side plates 4a, 4b on the left and right sides of the crankcase 4 and the inner surfaces of the long side plates 8a, 8b on the left and right sides of the ladder frame 8 are applied. On the other hand, it is blown down along these inner surfaces and returns to the oil pan 12 from the upper surface of the bottom member 10 of the ladder frame 8.

  Under the crankshaft 5, a power transmission shaft 20, which is vertically oriented with respect to the crankshaft 5, is disposed through the bottom member 10 of the ladder frame 8. The power transmission shaft 20 is rotatably supported by a bearing portion 21 provided integrally with the bottom member 10 of the ladder frame 8.

  The bearing portion 21 for the power transmission shaft 20 is located at a position higher than the oil level of the lubricating oil in the oil pan 12, and the oil seal 22 is provided at the lower end portion of the bearing portion 21. An oil relief passage 23 is provided in the inner portion of the oil seal 22 so as to be fitted in close contact with the power transmission shaft 20, and the inside of the bearing portion 21 communicates with the oil pan 12. ing.

  On the other hand, as shown in FIG. 6, an oil reservoir chamber 24 is formed in the end face 20 a at the upper end of the power transmission shaft 20 into the ladder frame 8. At least one oil passage 25 extending outward in the radial direction from the oil reservoir chamber 24 is configured such that the other end of the oil passage 25 opens in a portion of the outer peripheral surface of the power transmission shaft 20 in the bearing portion 21. Has been drilled.

  As a result, part of the lubricating oil scattered by rotation of the crankshaft 5 in the crankcase 4 and the ladder frame 8 jumps into and accumulates in the oil reservoir chamber 24. When the oil passes through the oil passage 25, the lubricating oil is swung out outward in the radial direction by the centrifugal force generated by the rotation of the power transmission shaft 20, so that the inside of the bearing portion 21 is forcibly and reliably forced. To be supplied.

  In this case, in the present invention, the upper part of the oil reservoir chamber 24 is formed in the upward funnel-shaped enlarged opening 24a so that the lubricating oil jumping into the oil reservoir chamber 24 is increased. ing.

  In addition to this, in the present invention, by providing an enlarged portion 26 having an inner diameter at the opening into the oil reservoir chamber 24 in the oil passage 25, lubricating oil is transferred from the oil reservoir chamber 24 to the oil passage 25. The entrance resistance at the time of inflow is reduced.

  The enlarged portion 26 with respect to the oil passage 25 is formed by machining in the axial direction of the power transmission shaft 20 using a drill having a diameter D larger than the inner diameter d of the oil passage 25.

  The oil passage 25 is formed by drilling from an enlarged portion 26 drilled with a drill having a diameter D, and a plurality of oil passages 25 can be provided as shown.

  Since the lubricating oil supplied to the bearing portion 21 as described above sequentially flows out to the oil pan 12 through the oil relief passage 23, the lubricating oil leaks from the oil seal 22. It is the structure which can reduce reliably.

  A driven bevel gear 27 is fixed to one end of the power transmission shaft 20 in the ladder frame 8, and an output shaft 28 is detachably inserted into the power transmission shaft 20 in a power transmission state. A shaft joint hole 29 is provided by spline fitting.

  On the upper surface of the driven bevel gear 27, a press plate 30 fastened with bolts to the bottom member 10 is disposed. With this press plate 30, a thrust upward from below with respect to the power transmission shaft 20 is provided. Is configured to support.

  A hollow intermediate shaft 31 is disposed in parallel with the crankshaft 5 at a portion of the lower half of the bearing portions 15, 16, 18 of the ladder frame 8 below the one end bearing portion 15. 31 is rotatably supported by a bearing portion 32 which is detachably attached to a portion of the opening 10a to the oil pan 12 of the bottom member 10 by fastening bolts.

  Further, a driven gear 35 is fixed to one end of the intermediate shaft 31 and linked to a main gear 33 fixed to one end of the crankshaft 5 via an intermediate gear 34, while the other end of the intermediate shaft 31 is fixed to the other end of the intermediate shaft 31. The main bevel gear 36 that meshes with the driven bevel gear 27 in the power transmission shaft 20 is fixed.

  Accordingly, the rotation of the crankshaft 5 is transmitted to the power transmission shaft 20 by the main driving gear 33, the intermediate gear 34, the driven gear 35, the intermediate shaft 31, the main driving bevel gear 36 and the driven bevel gear 27. The power transmission mechanism 37 is configured such that the power transmission mechanism 37 is located at a position higher than the oil level of the lubricating oil so as not to be immersed in the lubricating oil in the oil pan 12. Most of the transmission mechanism 37 and the power transmission shaft 20 are assembled to the bottom member 10 constituting the bottom of the ladder frame 8.

  The intermediate gear 34 is rotatably fitted to an intermediate shaft 39 that is detachably attached to a side surface of the one end bearing portion 15 by fastening bolts 38. The driven gear 35 on the bottom member 10 side and the intermediate gear 34 on the ladder frame 8 side are configured to be engaged with each other at the same time as the bottom member 10 is joined to the ladder frame 8, It is designed for ease of assembly.

  In the configuration described above, when the crankshaft 5 is rotated by the operation of the internal combustion engine 1, the rotation of the crankshaft 5 is transferred to the power transmission shaft 20 in the direction intersecting the crankshaft 5 via the power transmission mechanism 37. Therefore, the power obtained in the internal combustion engine 1 can be taken out as the rotation of the power transmission shaft 20.

  In the above-described embodiment, the lubricating oil supply device according to the present invention is applied to the power transmission shaft 20 that is vertically supported on the bottom portion of the ladder frame 8 containing the crankshaft 5 in the lower portion of the internal combustion engine 1. However, the lubricating oil supply device of the present invention is not limited to this, and in a transmission case incorporating various motion mechanisms such as a transmission case incorporating various transmission gear mechanisms. The present invention can be similarly applied to a power transmission shaft that is pivotally supported through the bottom of the transmission case.

It is a principal part vertical front view of an internal combustion engine. FIG. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 1. FIG. 2 is a partially exploded view of FIG. 1. FIG. 5 is a VV sectional view of FIG. 4. It is a principal part enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multi-cylinder internal combustion engine 2 Cylinder block 3 Cylinder 4 Crankcase 5 Crankshaft 6 Piston 8 Ladder frame 10 Bottom member 12 Oil pan 13,14,17 Upper half bearing part 15,16,18 Lower half bearing part 20 Power transmission Shaft 21 Bearing portion of power transmission shaft 24 Oil reservoir chamber 24a Funnel-shaped enlarged opening 25 Oil passage 26 Enlarged portion of inner diameter

Claims (3)

In a transmission case that has a built-in motion mechanism and has a bearing portion for a power transmission shaft that penetrates the bottom in the vertical direction.
An oil reservoir chamber is formed in the end face at the upper end of the longitudinal power transmission shaft into the transmission case so that the lubricating oil scattered in the transmission case is dented, and the power transmission shaft And a lubricating oil supply device for a power transmission shaft in a transmission case, wherein at least one oil passage is provided so as to extend radially outward from the oil reservoir chamber toward the bearing portion. .   2. The lubricating oil supply device for a power transmission shaft in a transmission case according to claim 1, wherein an upward funnel-shaped enlarged opening is provided at an upper portion of the oil reservoir chamber.   3. The lubricating oil supply device for a power transmission shaft in a transmission case according to claim 1 or 2, wherein an enlarged inner diameter portion is provided at an opening portion of the oil passage into the oil reservoir chamber.

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