JP2574177Y2 - Spline lubrication structure in PTO device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spline lubricating structure in a PTO device for extracting power from an engine.

[0002]

2. Description of the Related Art As a spline lubrication structure in a conventional PTO apparatus, as shown in FIGS. 3 and 4, for example, both ends of a sprocket 3 are supported by bearings 4 and 5 in a case 1 sealed by a front cover 2. The sprocket 3 is connected to an engine output unit (not shown) by a drive chain 6. A through hole 7 is formed in the center of the sprocket 3, and the spline portion 8 of the input shaft 10 of the hydraulic pump 9 fixed to the case 1 is formed in the through hole 7.
And the spline portion 8 and the inside of the case 1
Are communicated by one. Then, the the inner wall surface above a portion of the case 1 to fix the lubricating oil guide rib 14 of the trapezoidal shape with a lower edge of the downward slope toward the oil supply hole 11, the hydraulic pump 9 side bearing support portion 1 ₂ Has a weir 13 with a downward slope protruding toward the oil supply hole 11. The bearing 4 on the side of the hydraulic pump 9 is a sealed type having a seal 12, and the bearing 4 and the hydraulic pump 9 form an oil reservoir 15. Then, the power of the engine output unit rotates the sprocket 3 via the drive chain 6 and is transmitted to the hydraulic pump input shaft 10. At this time, the lubricating oil in the engine oil reservoir is scattered by the drive chain and flows into the oil supply hole 11 through the lubricating oil guide ribs 14 and the weirs 13, flows through the spline portion 8 and the bearing 5, and enters the oil reservoir 15. The lubricating oil is stored, and the lubricating oil stored in the oil reservoir 15 flows through the spline portion 8 and the bearing 5 to lubricate the spline portion 8.

[0003]

However, in this conventional spline lubrication structure, it is necessary to use a sealed type bearing 4 in order to form the oil reservoir 15, and after the engine is stopped, the bearing 4 needs to be re-used after a while. When started, the lubricating oil stored in the oil sump 15
Leaked into the case 1 little by little.
For this reason, when the engine is restarted, the spline portion 8 cannot be lubricated, and the sprocket 3 and the hydraulic pump input shaft 10 are insufficiently lubricated. An object of the present invention is to provide a spline lubrication structure in a PTO device that solves the conventional problems.

[0004]

Means for Solving the Problems The present invention provides, in a case,
Both ends of a sprocket connected to an engine output unit via a drive chain are supported by bearings, and a spline portion of an input shaft of a hydraulic pump fixed to a case is connected to a through hole provided in a center portion of the sprocket. Device in which the partition wall extends from the lower half bearing contact wall of the hydraulic pump side bearing support portion toward the lower part of the spline in the PTO device which communicates with the inside of the case via an oil supply hole, and the partition wall and the hydraulic pump A spline lubrication structure in a PTO device, wherein an oil reservoir is formed with a casing.

[0005]

When the power of the engine output portion is transmitted to the input shaft of the hydraulic pump, the scattered lubricating oil travels along the guide ribs, passes through the oil supply hole, flows through the spline portion, the through hole, and the bearing. The lubricating oil stored in the oil reservoir formed by the partition wall and the hydraulic pump casing is supplied to the spline portion due to its viscosity, and passes through the bearing on the hydraulic pump side, due to its viscosity. Spills into the case. On the other hand, the oil that has lubricated the spline portion lubricates the bearing on the opposite side through the through hole and flows out into the case. Further, since the gap between the upper edge of the partition wall and the outer edge of the spline portion is 1 to 2 mm, lubrication of the spline portion is smoothly performed by using the viscosity of oil without interference between the partition wall and the spline portion. Done.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a spline lubrication structure, and FIG. 2 is a plan view of a case shown in FIG. Both ends of the sprocket 3 are supported by bearings 4 and 5 in the sealed case 1, and the sprocket 3 is connected to an engine output unit (not shown) by a drive chain 6. A through hole 7 is formed in the center of the sprocket 3, and a spline portion 8 provided in a part thereof is provided.
The spline portion 8 of the input shaft 10 of the hydraulic pump 9, which is fixed to the case 1 to ₁ is connected, the bearing support wall 1 ₄ oil supply hole 11 which is opened with an appropriate length in the rotation direction of the chain 6 is provided . A curved lubricating oil guide rib 14 having a lower end edge inclined downward toward the oil supply hole 11 is provided integrally with the case 1 at an upper part of the inner wall surface of the case 1. Then, by extending the partition wall 1 ₁ towards the casing 1 of the lower half of the hydraulic pump 9 side bearing support portion 1 ₂ bearing abutment wall splined lower portion, splines on the upper edge of the partition wall 1 ₁ part 8 is formed a notch 1 ₃ so that the gap h between the outer edge to form an oil reservoir 15 between the partition wall 1 ₁ and the hydraulic pump 9 casing. The gap h is about 1 to 2 mm. An open type bearing is used as the bearing 4.

[0007] With this configuration, the power of the engine output portion is transmitted through the drive chain 6 to the sprocket 3.
To be transmitted to the hydraulic pump input shaft 10,
The lubricating oil in the engine oil reservoir is scattered by the drive chain 6, flows along the lower end edge of the lubricating oil guide rib 14, flows into the oil supply hole 11, flows through the spline portion 8, the through hole 7, the bearing 5, and flows into the case 1. And is stored in the oil reservoir 15. When the lubricating oil is reserved in the oil reservoir 15 to over partition wall 1 ₁ The lubricant oil is supplied from the gap h between the upper edge portion and the spline portion 8 of the partition wall 1 ₁ to spline section 8 by its viscosity At the same time, it flows in the bearing 4 and flows out of the case 1. Therefore, the lubrication of the spline portion 8 is ensured, and even when the engine is restarted after the engine is stopped, sufficient oil is stored in the oil reservoir without leaking oil. Will be supplied. In addition, since it is not necessary to use a conventional closed type bearing and an open type bearing is sufficient, the cost can be reduced. Incidentally, since it is a gap 1~2mm the upper edge and the spline portion 8 the outer edge of the partition wall 1 _1, the partition walls 1
The lubrication of the spline portion 8 is smoothly performed without interference between the spline portion ₁ and the spline portion 8.

[0008]

According to the present invention, a partition wall extends from the bearing contact wall in the lower half of the bearing support portion of the hydraulic pump toward the lower part of the spline, and an oil reservoir is formed by the partition wall and the hydraulic pump casing. Therefore, when the power of the engine output portion is transmitted to the hydraulic pump input shaft, the lubricating oil is reliably stored in the oil reservoir and supplied to the spline portion due to its viscosity. Also, there is no shortage of lubrication to the spline portion when the engine is restarted. In addition, the bearing does not need to be a sealed type, and the cost can be reduced. or,
The gap between the upper edge of the partition wall and the outer edge of the spline portion is 1
Since it is about 2 mm, the lubrication of the spline portion is smoothly performed by the viscosity of the oil without interference between the partition wall and the spline portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of the case shown in FIG. 1;

FIG. 3 is a longitudinal sectional view of a conventional example.

FIG. 4 is a plan view of the case shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Front cover 3 Sprocket 4 Bearing 5 Bearing 6 Drive chain 7 Through hole 8 Spline 9 Hydraulic pump 10 Hydraulic pump input shaft 11 Oil supply hole 12 Seal 13 Weir 14 Lubricating oil guide rib 15 Oil reservoir

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-4964 (JP, A) JP-A-1-216165 (JP, A) JP-A-1-82423 (JP, A) JP-A-2- 107859 (JP, A) Japanese Utility Model 63-194031 (JP, U) Japanese Utility Model 1-102561 (JP, U) Japanese Utility Model 5-12830 (JP, U) Japanese Utility Model 62-32261 (JP, U) 56-59351 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16H 57/04 F16H 57/02 541 B60K 25/06

Claims (2)

(57) [Scope of request for utility model registration] 1. A sprocket connected to an engine output portion via a drive chain in a case and both ends of the sprocket are supported by bearings, and an input shaft of a hydraulic pump fixed to the case is fixed to a through hole provided in a center portion of the sprocket. In a PTO device in which a spline portion is connected and the spline portion and the inside of the case are communicated via an oil supply hole, a partition wall extends from a bearing contact wall in a lower half of a hydraulic pump side bearing support portion toward a lower portion of the spline. A spline lubrication structure in the PTO device, wherein an oil reservoir is formed by the partition wall and the hydraulic pump casing. 2. The spline lubrication structure according to claim 1, wherein a gap between an upper edge of the partition wall and an outer edge of the spline portion is 1 to 2 mm.