JP2572440Y2 - Transfer lubrication 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 transfer lubricating device for distributing a driving force from an engine to a front wheel and a rear wheel of a four-wheel drive vehicle, and particularly to a transfer lubricating roller bearing for supporting a transfer input gear. The improvement of the lubricating device.

[0002]

2. Description of the Related Art This type of transfer includes a gear case containing an input gear for receiving power from a transmission, an idler gear meshing with the input gear, and an output gear meshing with the idler gear, and an open rear end face of the gear case. And a rear cover having an oil holding portion for holding oil which is lifted up by the input gear and having a partition wall for isolating a cover portion opposed to the closing input gear and the idler gear. An oil introduction groove provided on the inner surface to face the input gear and guiding oil to the oil holding portion; and an oil discharge groove for guiding oil from the oil holding portion to a portion facing the idler gear below the partition of the rear cover,
The receiving port of the oil discharge groove is provided below and on the same side as the oil introduction groove.

[0003]

However, since the highest oil level of the oil holding portion of the rear cover is the receiving port of the oil discharge groove, the oil discharge groove is provided on the same side as the oil introduction groove and below it. In this case, the amount of oil accumulated in the oil holding portion of the rear cover is small, and therefore the amount of oil supplied to the bearings of the input gear is reduced. In particular, when a high load is applied, the calorific value increases, and burning may occur. was there. Also, if the oil discharge groove is on the same side as the oil introduction groove, the oil discharge groove is located in the middle of the oil introduction path, so oil leaks through this oil discharge groove before the oil accumulates in the oil holding portion, There was a disadvantage that the oil supply efficiency was low.

An object of the present invention is to avoid the above drawbacks and increase the amount of oil accumulated in the oil holding portion of the rear cover.
Another object of the present invention is to provide a transfer lubrication device capable of improving oil supply efficiency.

[0005]

According to the present invention, an input gear for receiving power from a transmission, an idler gear meshing with the input gear, and an output gear meshing with the idler gear are housed in order to solve the above problems. An oil that has a gear case and a partition that closes an open rear end surface of the gear case and separates a cover portion that faces the input gear and the idler gear, holds oil that is scraped up by the input gear, and brings oil into contact with a bearing of the input gear. An oil introduction groove is provided on the inner surface of the rear cover of the transfer comprising a rear cover having a holding portion and faces the input gear to guide oil to the oil holding portion. In a transfer lubrication device having an oil discharge groove for guiding, The introduction groove and the receiving opening of the oil discharge groove are provided to face each other in the radial direction of the input gear, and the receiving opening of the oil discharge groove is located at a height almost approaching a portion leading from the oil introduction groove to the oil holding portion. An object of the present invention is to provide a transfer lubrication device provided to be open.

[0006]

As described above, when the oil introduction groove and the receiving port of the oil discharge groove are provided on the opposite sides in the radial direction of the input gear, the oil introduced into the oil holding portion through the oil introduction groove is formed. There is no leakage before accumulation, and the oil supply efficiency can be improved, and the receiving opening of the oil discharge groove is opened at a height almost close to the part that guides the oil from the oil introduction groove to the oil holding part. With such a configuration, the oil level of the oil holding portion is increased, the amount of accumulated oil is increased, and the lubrication performance of the bearing of the input gear is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described in detail. FIG. 1 shows a transfer 12 having a lubricating device 10 according to the present invention, and the transfer 12 receives power from a transmission (not shown). A gear case 20 containing an input gear 14, an idler gear 16 meshing with the input gear 14, and an output gear 18 meshing with the idler gear 16. Front cover 22 and rear cover 2
It consists of four. A differential mechanism 26 is incorporated in the output gear 18, and power from the output gear 18 is distributed to the front drive shaft 28 and the rear drive shaft 30 via the differential mechanism 26.

[0008] Input gear 14 and idler gear 16
Are supported by the gear case 20 by roller bearings 32 and 34, respectively. The rear cover 24 holds the oil which is lifted up by the input gear 14 and the partition wall 36 which separates the cover portions 24A and 24B facing the input gear 14 and the idler gear 16 and brings the oil into contact with the roller bearing 32 of the input gear 14. An oil holding portion 38.

As shown in detail in FIG. 2, the lubricating device 10 of the present invention has an input gear 14 on the inner surface of a rear cover 24.
And an oil discharge groove 42 for guiding oil to the oil holding portion 38 and guiding the oil from the oil holding portion 38 to the cover portion 24B facing the idler gear 16 below the partition 36. . The oil introduction groove 40 and the receiving opening 42 a of the oil discharging groove 42 are provided apart from each other in the radial direction of the input gear 14, and the receiving opening 42 a of the oil discharging groove 42 is provided.
The opening is provided so as to open at a height position substantially approaching a portion for guiding oil from the oil introduction groove 40 to the oil holding portion 38.
Incidentally, the oil introduction groove 40 is formed in a gutter shape as shown in FIG. 3, and the oil scooped up by the input gear 14 is introduced from the upper opening of the gutter. In FIG. 1, reference numeral 44 denotes a breather.

Next, the transfer lubricating device 1 of the present invention will be described.
0, when the power is transmitted from the transmission to the transfer 12, the input gear 14,
The output gear 18 is driven via the idler gear 16, and power is distributed to the front drive shaft 28 and the rear drive shaft 30 to drive four wheels.

When the input gear 14 rotates, the oil is scraped up and introduced into the oil introduction groove 40 of the lubricating device 10,
This oil is accumulated in the oil holding unit 38. As shown in FIG. 2, the receiving port 42 a of the oil discharge groove 42 is provided on the radially opposite side of the input gear 14 with respect to the oil introduction groove 40. The introduced oil does not leak before accumulation, and the oil supply efficiency can be improved. The receiving port 4 of the oil discharge groove 42
2a is provided so as to open at a height position substantially approaching a portion for guiding the oil from the oil introduction groove 40 to the oil holding portion 38, so that the oil level of the oil holding portion 38 increases and the amount of accumulated oil And the lubrication performance of the roller bearing 32 of the input gear 14 is improved.

[0012]

According to the present invention, as described above, the receiving opening of the oil discharge groove for guiding oil from the oil holding portion of the input gear of the transfer to the idler gear is located in the radial direction of the input gear with respect to the oil introduction groove. Since it is provided on the opposite side, the oil introduced into the oil holding portion through the oil introduction groove does not leak before accumulation, the oil supply efficiency can be improved, and the receiving port of the oil discharge groove is Is provided at an approximate height from the oil introduction groove to the part that guides the oil to the oil holding part, so that the oil level of the oil holding part increases and the amount of accumulated oil increases. There is a real benefit in improving the lubrication performance of gear bearings.

[Brief description of the drawings]

FIG. 1 is a side view showing a transfer provided with a lubricating device according to the present invention, in which a gear case and a rear cover are cut away.

FIG. 2 is an internal view of a rear cover used in the present invention.

FIG. 3 is an enlarged sectional view of an oil introduction groove used in the present invention.

[Explanation of symbols]

 Reference Signs List 10 lubrication device for transfer 12 transfer 14 input gear 16 idler gear 18 output gear 20 gear case 22 front cover 24 rear cover 24A cover portion facing input gear 24B cover portion facing output gear 26 differential mechanism 28 front drive shaft 30 rear Drive shaft 32 Roller bearing 34 Roller bearing 36 Partition wall 38 Oil holding part 40 Oil introduction groove 42 Oil discharge groove 42a Receiving port

Claims (1)

(57) [Scope of request for utility model registration] 1. A gear case containing an input gear for receiving power from a transmission, an idler gear meshing with the input gear, and an output gear meshing with the idler gear, an open rear end face of the gear case is closed, and the input gear and the idler gear are closed. And a rear cover having an oil holding portion for holding oil scooped up by the input gear, the transfer cover being provided opposite to the input gear. A lubricating device for a transfer having an oil introduction groove for guiding oil to the oil holding portion and an oil discharge groove for guiding oil from the oil holding portion to a portion opposite to the idler gear below the partition. The oil discharge groove receiving port is the input gear The lubrication of transfer lubrication is provided so as to face each other in the radial direction, and the receiving opening of the oil discharge groove is opened at a height position almost approaching a portion leading from the oil introduction groove to the oil holding portion. apparatus.