JPS605151Y2 - gear type transmission - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gear type transmission that allows proper lubrication of bearings such as an input shaft and an output shaft.

For example, in a gear reducer, the input shaft (high speed) and output shaft (low speed) are supported on the same horizontal plane relative to the case.
A gear system is interposed between both shafts, and this gear system sequentially changes the rotation speed of the input shaft and transmits it to the output shaft.Generally, gears with high rotation speeds have a small shaft diameter, and therefore their bearings are also small. The shaft diameter of low-speed gears is large.

Therefore, the higher the bearing rotation speed of the gear, the greater the amount of heat generated, and the lower the bearing rotation speed, the smaller the amount of heat generated.

On the other hand, these bearings are lubricated by splashing up lubricating oil from the bottom of the case with gears and dripping the droplets onto the bearings.

Therefore, the current situation is that inappropriate lubrication is performed for all bearings regardless of the heat generation status of the bearings.

This idea uses a system in which the lubricating oil at the bottom of the case is splashed up by the rotation of the gears, and the collected oil drips onto each bearing for lubrication.The structure is simple, easy to handle, and easy to maintain. The objective is to realize a gear type transmission that can supply the appropriate amount of oil required to each bearing.

FIG. 1 is a longitudinal cross-sectional view showing the configuration of a gear type reduction gear implementing this invention, and FIG. 2 is a side cross-sectional view of FIG. 1.

In the figure, 1 is an input shaft, 1 nt is an output shaft, 1" is an intermediate shaft, and gears (not shown) are attached to each to form a gear system, and 2', 2", and 2" are Bearings for each shaft, 3 is the lower case, 4 is the upper case,
5 is lubricating oil.

When each gear rotates due to the rotation of the input shaft 1', lubricating oil 5 is splashed up at the outer edge of the gear, and the droplets flow down along the inner surface of the wall of the upper case 4.

Reference numeral 6 denotes a gutter provided on the inner surface of both side walls of the upper case 4, the bottom of which is installed close to each of the bearings 2', 2" 2 III.

These bearings are arranged on the horizontal mating surface of the upper case 4 and the lower case 5, and their outer diameters differ in inverse proportion to the rotational speed of their respective shafts as described later. The bottom height is sloping.

Numeral 7 denotes a conduit which opens at the bottom of the gutter 6 on the side of the case wall, right above the respective bearings 2' and 2"2nr, approaches the bearings and penetrates the case wall in parallel, and the other end is connected to the case wall. It opens above the bearing on the outer surface of the wall.

On the other hand, shafts 1' and 1''l III support gears that sequentially transmit the same power, but as mentioned above, those with high rotation speeds have small shaft diameters, and those with low rotation speeds The diameter of the shaft is large.

The droplets of the lubricating oil thus flow down the case wall and are collected in the gutter 6.

FIG. 2 is a sectional view taken along plane A and A' in FIG. 1.

The water head between the oil level of the collected oil and the respective openings 8 at the bottom of the gutter 6 is determined by the respective bearings 2', 2" 2
nt, and therefore, more lubricating oil is supplied to bearing 2', which has a high rotational speed and generates a large amount of heat, and less lubricating oil is supplied to bearing 2'', which has a low rotational speed and generates little heat. will be done.

In addition, 9 is a through passage parallel to the bearing, which warms the lubricating oil in the pipe according to the heat generated by the bearing, lowers its viscosity, adjusts the fluidity of the lubricating oil, and is affected by the water head of the oil. Supply the amount of lubricating oil.

The through passage 9 may be a straight through passage that does not curve into an L shape as shown in the figure.

FIG. 3 is a longitudinal sectional view of a gear reducer according to another embodiment of this invention.
In the figure, parts common to those in FIGS. 1 and 2 are given the same reference numerals.

10', 10". 10"' is a pocket provided between the oil receiving gutter 6 and the pipe line 7, and these pockets 10', 10
The lubricating oil collected in the oil receiving gutter 6 drips into Q III from the hole 11 at the bottom of the gutter.

As is clear from the drawing, each pocket 10', 10" 1
0 nt is different in oil sump depth and water head),
Therefore, the amount of lubrication required by each bearing 2', 2'' 2 nt is supplied.

That is, this pocket 10', 10" l Q II
In the embodiment with I, the gutter 6 and the bearings 2', 2'', 2''
Irrespective of the head difference between the bearings 2' and 2', the amount of lubricating oil applied is based on the fact that the water head differs depending on the height of the pockets 10' and 10' I Q III relative to the bearings 2' and 2', respectively. It is something that allows you to do this.

Structures other than gutters and pockets are also conceivable as oil receivers.

L' is the oil level. This invention can be applied not only to gear type reducers but also to speed increasers, and as explained in detail above, it does not require a particularly complicated lubricant lubrication method, but rather ensures that each bearing is properly lubricated with the necessary lubricant. It is possible to realize a gear type transmission which is carried out in an appropriate amount, has a simple structure, is easy to handle and maintain, and is also excellent in economical efficiency.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of a gear reducer incorporating gears based on this invention, Figure 2 is a cross-sectional view of planes A and A' in Figure 1, and Figure 3 is a longitudinal cross-section of another embodiment of this invention. It is a front view. 1'...Input shaft, 1#...Intermediate shaft, 1
″′・curve・output shaft, 2′, 2″ 2 nt・・・・・・
Bearing, 3... Lower case, 4... Upper case, 5... Lubricating oil, 6... Gutter, 7
...Pipeline, butthole, opening, 9...
Penetrating part, 10', 10" l Q III...
・Pocket, 11...hole, h...water head, L, L'...oil level.

Claims (1)

[Scope of utility model registration request] The input shaft and the output shaft are rotatably installed in a case via bearings on the same horizontal plane, and the two shafts are connected via a gear system to change the rotational speed of the input shaft and transmit it to the output shaft, and In a transmission in which the lubricating oil at the bottom of the case is splashed up by the gear and the droplets are supplied to each bearing such as the two bearings to lubricate the bearings, the droplets of the lubricating oil are received in the case. A reservoir is provided, and an oil receiver is provided so that its bottom is close to each bearing, and a supply mechanism is provided to supply lubricating oil from this oil receiver to each bearing located below. A gear type transmission characterized in that an appropriate amount of oil is supplied by utilizing the head of oil in an oil pan which is inversely proportional to the size of the oil.