JPH017850Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a method for assembling a shaft having an engaging portion with another member such as a gear and a bearing that supports the end of the shaft in a sealed state. The present invention relates to a bearing lubricating oil supply device capable of quickly removing air from a bearing and supplying an appropriate amount of lubricating oil to the bearing from the outside during operation.

Normally, bearings have holes or grooves for lubricating oil on the side of the equipment case where the bearing part is formed, so that lubricating oil is supplied during operation, and the holes or grooves also provide pumping action when the shaft and bearing part are assembled. This makes the assembly easier.
However, if holes or grooves for lubricating oil are provided in the bearing part on the side of the device case as in the past, the bearing performance will deteriorate due to bearing precision or machining burrs in the groove, etc., and the holes for lubricating oil may have to be machined separately. Problems such as removing burrs at the tip of the hole generally increase the number of processing steps are raised.

The present inventor has devised the present invention in view of the above-mentioned problems and to effectively solve the problems.

The object of the present invention is to provide a hole on the shaft side of the bearing that communicates with the outside, and to form the outer opening of the hole into an engaging part such as a spline fitting, and to use the small gap to air. It is an object of the present invention to provide a bearing lubricating oil supply device that performs removal and supply of lubricating oil.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a horizontal cross-sectional view of an engine that is a power unit of a three-wheeled motor vehicle. To roughly explain the structure, the power unit 1 consists of an engine 2 and a transmission case 3. As shown in FIG. The central member 4 of the transmission case 3 is formed long rearward and forms the left side of the crankcase, and is covered by the left side cover 5 of the central member 4. At the rear of the central member 4 is a bearing portion 4 that bulges outward in the width direction.
A is provided, and the outside (right side) of this is covered with a small cover 6. Therefore, the transmission case 3 includes a central member 4 of which the crankcase is a part, and covers 5 and 6 on the left and right sides of the central member 4.
These are integrally joined with bolts or the like, and a gasket or the like is interposed on the joint surface.

A crankshaft 2a is installed at the front of the transmission case 3.
A variable drive pulley 7 is connected to the rear part, and a variable driven pulley 8 is disposed at the rear, and these pulleys 7 and 8 are connected by a V belt 9.
A centrifugal clutch 10 is disposed on the driven pulley 8, and its output shaft 10a is connected to a drive shaft 12 via a gear transmission mechanism 11. Becomes,
Both shafts 12a and 12b are differentially connected by a friction clutch 13, one shaft 12a is connected to the gear transmission mechanism 11, and the outer ends of each shaft are connected to the left and right covers 5,
6, left and right rear wheels 14, 14 are connected to the shaft ends, and these rear wheels 14, 14 form driving wheels.

In the above, the bearing lubricating oil supply device according to the present invention is provided at the connecting portion A of both shafts 12a and 12b of the drive shaft 12.

In FIG. 2, at the joint A between the shafts 12a and 12b, a blind hole 16 is formed in the large-diameter end surface of the shaft 12b, and the opposing end 17 of the other shaft 12a has a slightly smaller diameter. inserted into the blind hole 16, and the blind hole 1
6 and the end 17 of the shaft 12a, there is a bearing, i.e. a needle bearing 18, on the inside, and an oil seal 1 on the outside so as to seal the bearing part as a whole.
9 are interposed, respectively, so that the bearings are supported. On the other hand, inside the shaft 12a, a hole 20 having one opening 20a at the tip end face of the end portion 17 is formed concentrically in the axial direction. One small hole 20 leading to the outside
b is formed. The radial small hole 20b is
A spline fitting portion C that is a supporting and fixing portion of the gear 11a that is in a state of meshing with the spline fitting provided for connecting the shaft 12a with the gear transmission mechanism 11.
The opening is formed so as to face the.

As shown in the figure, the inside of the transmission case 3 is divided into a wet chamber on the right side having an oil reservoir and a dry chamber on the left side.A gear 11a, which is a power transmission member, is arranged in the wet chamber, and a dry chamber is located in the dry chamber. A connecting portion A between shafts 12a and 12b is disposed at which power can be transmitted using a dry friction clutch 13.

In the above configuration, the needle bearing 18 and the oil seal 19 are interposed during assembly, and the shaft 12a
When attempting to insert the end 17 of the shaft 12b into the blind hole 16 of the shaft 12b, the air in the blind hole 16 passes through the hole 20 and escapes to the outside through the gap in the spline fitting portion C, while the assembly is completed. Above power unit 1
When the engine operates, the oil 21 stored at the bottom of the transmission case 3 of the engine is splashed upward by the rotation of the gear 11a, and as a result, the oil 21 also enters the spline fitting portion C of the gear 11a.
A suitable amount of oil is supplied as lubricating oil to the sealed bearing part A' through the holes 20b, 20. Therefore, during assembly, the air is removed quickly to facilitate assembly, and during operation, an appropriate amount of oil is applied to the bearing portion A', thereby increasing the durability of the device.

In addition, gear 15 is an example in which the communicating hole structure is common.
To explain the bearing part B of the shaft 15 of a and 15b, in this bearing, the bearing part is connected to the part 6 of the case cover 6.
a and the inner wall portion 22, and has a structure of bearings at both ends. A through hole 15c is formed coaxially in the interior of the shaft 15 and opens at both end faces in the axial direction, and at least one small hole 15d is formed in the radial direction in this hole 15c. small hole 15
The external opening d is formed so as to face the fitting portion D that meshes with the gear 15a by spline fitting. With the above configuration, air can be removed when the shaft 15 is attached to the main body case of the power unit, and an appropriate amount of oil can be supplied during operation.

As is clear from the above explanation, according to the present invention,
When assembling the bearing, it is possible to reliably bleed air, so assembly is easy, and the air bleed hole can be used to supply lubricating oil to the bearing. In particular, since the hole is opened to the outside at, for example, a spline fitting portion provided on the shaft, there is an advantage that an appropriate amount of lubricating oil can be supplied to the bearing. Furthermore, since there is no need to form a special lubricating oil supply part on the main body case, there is also the advantage that the number of machining steps can be reduced. According to the present invention, power transmission is possible by connecting the shafts with a simple structure using a dry friction clutch placed in a dry chamber, and the relative rotation of both shafts is achieved by supplying oil into the blind hole through the communication hole. It is possible to ensure lubricity during movement. During this lubrication, a pressure difference occurs between the dry chamber and the wet chamber due to temperature changes during operation, and this pressure difference causes a breathing effect between the communication hole and the wet chamber. Due to this breathing action, lubricating oil is quickly introduced into the blind hole, and the bearing portion is reliably lubricated.
Furthermore, when the two shafts rotate relative to each other, frictional heat is generated from the engagement plates of the friction clutch, and as this frictional heat is repeatedly generated during operation, the temperature of the blind hole including the bearing changes, which reduces the supply of lubricating oil. The necessary breathing action is ensured.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a horizontal sectional view of a power unit to which the present invention is applied, and FIG. 2 is a sectional view taken along line 2-2 in FIG. In addition, in the drawing, 12 is an output shaft, 12a, 12b are each shaft that constitutes the output shaft, 20 is a hole, 20b is a small hole,
A is a joint portion, A' is a bearing portion, B is another bearing portion, and C and D are spline fitting meshing portions.

Claims (1)

[Scope of Claim for Utility Model Registration] The inside of the case is partitioned into a wet chamber with an oil reservoir and a dry chamber, and one shaft has a power transmission member such as a gear placed in the wet chamber attached to a support fixing part formed on the outer periphery. The end of the shaft protrudes into the dry chamber, and the protruding end of this shaft is inserted into a blind hole formed at the opposite end of the other shaft coaxially arranged in the dry chamber, with a bearing interposed therein. a dry friction clutch which hermetically seals an open end of the shaft and which is capable of transmitting power between the two shafts across the outer periphery of the protruding end of the one shaft and the outer periphery of the opposing end of the other shaft in the dry chamber; Further, the one shaft is provided with a communication hole, one end of which opens in the shaft end surface into the blind hole of the other shaft, and the other end opens in the support fixing portion of the shaft outer periphery to which the power transmission member is attached. A bearing lubricating oil supply device characterized by having a hole.