JPH0522670Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a transmission device, and particularly to a lubrication structure thereof.

(Prior Art) Conventionally, in a transmission device, in order to be able to supply oil scraped up by a gear train to parts that do not face the gear train, a transmission output shaft and a transmission output shaft are used. A transfer input shaft to which the driving force of the shaft is transmitted and supported by a first bearing, and a transfer output shaft fitted to the shaft end of the transfer input shaft via a second bearing are coaxial. A gear train scrapes up oil from an oil reservoir provided on the lower inside of the transfer case, and the oil scraped up by the gear train passes through an oil passage provided inside the transfer case to the honey. It is known that the oil is guided by an oil seal provided in an extension wall (retainer) of a housing case (for example, see Japanese Utility Model Application No. 152844/1983).

(Problem to be Solved by the Invention) By the way, in the above-mentioned transmission device, a second oil reservoir is provided in the extension wall of the transmission case, into which the oil scooped up by the gear train is guided through an oil passage. When the second bearing is to be lubricated using the oil in the second oil reservoir, the transfer input shaft is provided with a lubrication passage for guiding the oil in the second oil reservoir to the second bearing. It must be formed by drilling holes. However, this lubrication passage makes drilling the hole extremely troublesome.

The present invention was made in view of this point, and as mentioned above, the second part is attached to the extension wall of the transmission case.
When an oil reservoir is provided and the second bearing is lubricated by the oil in the second oil reservoir, the transmission output shaft and the transfer input shaft are formed into a spline connection structure, and this spline fitting portion is used as a lubrication passage to the second bearing. By using it as
The purpose is to eliminate the need for special hole machining for a lubrication passage to the second bearing.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention includes a transmission output shaft and a transfer shaft to which the driving force of the transmission output shaft is transmitted and supported by a first bearing. The input shaft and the transfer output shaft, which is fitted to the shaft end of the transfer input shaft through a second bearing, are arranged coaxially, and oil is supplied from a first oil reservoir provided on the inner lower side of the transfer case. Oil is scraped up by the gear train, and the oil scraped up by the gear train passes through the oil passage to the second oil passage installed in the extension wall of the transmission case.
The assumption is that the transmission device is guided to an oil sump. The transfer input shaft is configured with a hollow shaft, the transmission output shaft is spline-fitted into the transfer input shaft, and this spline-fitting portion is supported by a first bearing, and the second oil reservoir is supported by a first bearing. The structure is such that oil is guided to the second bearing through the spline fitting portion.

(Operation) The oil in the second oil reservoir on the extension wall of the transmission case is guided through the spline fitting portion to the second bearing interposed between the transfer input shaft and the transfer output shaft.

Furthermore, since the transmission output shaft is directly spline-fitted into the transfer input shaft, a spline length that can withstand use with a high-torque engine is ensured.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing the main parts of a transmission device, 1 is a transmission output shaft, and a spline 1a is formed on the outer periphery of the shaft end. Reference numeral 2 designates a transfer input shaft composed of a hollow shaft, and a spline 2a that fits into the spline 1a is formed on the inner periphery of one end on the transmission output shaft 1 side, and both splines 1a and 2a fit together. The driving force of the transmission output shaft 1 is transmitted to the transfer input shaft 2.

The spline fitting portion between the transmission output shaft 1 and the transfer input shaft 2 is rotatably supported by a first bearing 4 attached to the transfer case 3.

Further, a second bearing 5 is fitted to the inner periphery of the other end of the transfer input shaft 2, and one end of the transfer output shaft 6 is fitted into the transfer input shaft 2 via the second bearing 5. ing. The other end of the transfer output shaft 6 extends outside the transfer case 3 and is connected to a rear wheel propeller shaft (not shown) that transmits power to the rear wheels.

The transmission output shaft 1, transfer input shaft 2, and transfer output shaft 6 are arranged coaxially.

Further, below the front portions of the transfer input shaft 2 and the transfer output shaft 6, an intermediate shaft 7 is supported by the transfer case 3 so as to be substantially parallel to both the shafts 2 and 6.

A counter gear 8 is rotatably fitted into the intermediate shaft 7. The counter gear 8 has a large gear portion 8a on the mission output shaft 1 side, and the large gear portion 8a
meshes with the drive gear 2b integrally formed on the outer periphery of the transfer input shaft 2, and thereby the first oil reservoir 9 provided on the inner lower side of the transfer case 3
A gear train 10 is configured to scrape up oil on the inside and upper side of the transfer case 3.

The oil scraped up by the gear train 10 passes through an oil passage 12 formed in a protruding wall 11 that protrudes inward from the inner wall of the transfer case 3, and then passes through an oil passage 12 formed in an extension wall 13a of the transmission case 13. The oil is guided to a second oil reservoir 14. Note that the first bearing 4 is attached to the protruding wall 11. 15 is an oil seal provided in the transmission case 13.

The oil in the second oil reservoir 14 is guided through the spline fitting portion of the transmission output shaft 1 and the transfer input shaft 2 to the second bearing 5 through the inside of the transfer input shaft 2.
It is designed to lubricate it.

Further, an oil collar 16 is attached to the transfer input shaft 2 by a clip 17 so that the oil led through the spline fitting portion can also lubricate other parts through the oil passage 6a in the transfer output shaft 6. It is installed at.

With the above configuration, the spline 2a portion of the transmission output shaft 1 is directly spline-fitted to the spline 1a portion of the transfer input shaft 2, and the spline fitting portion (transfer input shaft 2) Since the spline is supported by the first bearing 4, a sufficient spline length can be ensured, and the spline can be applied to high-torque engines.

In addition, oil is scraped up from the first oil reservoir 9 by the gear train 10, and lubricated parts such as the shift rod 18 located opposite the gear train 10 are directly lubricated by the oil. Further, the oil scraped up by the gear train 10 is guided to an oil passage 12 that opens facing the gear train 10, and the oil that has flowed into the oil passage 12 is collected in a second oil reservoir 14. The oil accumulated in this second oil reservoir 14 is transferred to the transfer input shaft 2 through a gap formed at the fitting portion between the spline 1a of the transmission output shaft 1 and the spline 2a of the transfer input shaft 2. Flows into the shaft 6 side, passes through the oil collar 16,
While flowing into the oil passage 6a of the transfer output shaft 6, some of the oil flows into the second oil passage through the gap between the transfer output shaft 6 and the oil collar 16.
The bearing 5 is supplied and its lubrication takes place.

In addition, as shown in FIG. 2, the spline 1 of the transmission output shaft 1 or the transfer input shaft 2
It is also possible to actively form a lubrication passage 20 between the splines 1a and 2a of both shafts 1 and 2 by cutting out one of the spline teeth of the shafts 1 and 2, thereby further improving the lubricity.

(Effects of the invention) Since the invention is constructed as described above, the spline length of the spline fitting part between the transmission output shaft and the transfer input shaft can be ensured sufficiently to enable use in high-torque engines. However, since the spline fitting portion can be used as a lubrication passage, special hole machining for this lubrication passage becomes unnecessary, and machining can be simplified.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view showing the spline fitting portion between the transmission output shaft and the transfer input shaft, and FIG. 2 is an explanatory diagram of the spline fitting portion of a modified example. It is. 1... Mission output shaft, 1a, 2a... Spline, 2... Transfer input shaft, 3... Transfer case, 4... First bearing, 5...
Second bearing, 6...Transfer output shaft, 9
...First oil reservoir, 10...Gear train, 12...
Oil passage, 13...Mission case, 13a
...Extension wall, 14...Second oil reservoir, 20...
Lubrication passage.

Claims (1)

[Scope of utility model registration request] A transmission output shaft, a transfer input shaft to which the driving force of the transmission output shaft is transmitted and supported by a first bearing, and a transfer input shaft that is fitted to the shaft end of the transfer input shaft via a second bearing. The transfer output shaft is arranged coaxially,
Oil is scraped up by a gear train from a first oil reservoir provided on the inner lower side of the transfer case, and the oil scraped up by the gear train passes through an oil passage to a second oil reservoir provided in an extension wall of the transmission case. A transmission device guided to an oil reservoir, wherein the transfer input shaft is a hollow shaft,
The transmission output shaft is spline-fitted into the transfer input shaft, and this spline-fitting portion is supported by a first bearing, and the oil in the second oil reservoir is guided to the second bearing through the spline-fitting portion. A transmission device characterized by comprising: