JP2003130188A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient suction of lubricant filled in a case for accommodating a gear, when supplying lubricant to respective parts in a gear and a device. SOLUTION: Lubricant, filled to a height at which a part of a gear 28 accommodated in a case 22 is immersed, in sucked with an oil strainer 32 disposed in the bottom of the case 22, so as to be supplied to respective parts in the gear 28 and the device. At that time, the oil strainer 32 is arranged forward, in the direction of the rotation of the gear 28 in the bottom of the case 22. As a result, even when a liquid level of the lubricant leans to one side produced by a stir of the lubricant incident to the rotation of the gear 28, sufficient suction of the lubricant can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device, and more particularly to a power transmission device having a suction part for sucking a lubricating liquid filled to a height at which at least a part of a gear installed in the case is immersed in the case. And a power transmission device capable of transmitting power using the gear.

[0002]

2. Description of the Related Art Conventionally, as a power transmission device of this type,
It has been proposed to provide a clutch arranged inside the mission case, and a partition wall for partitioning the clutch arranged between the clutch and the suction portion (filter) arranged at the bottom of the mission case to suck the lubricating oil (Japanese Patent Laid-Open No. 11-278089). Gazette). In this device, the partition wall partitions the space between the clutch and the suction unit, thereby suppressing the bubbles generated by the rotation of the clutch from being sucked by the filter.

[0003]

However, in such a power transmission device, when the lubricating oil is stirred by the rotation of the clutch, the liquid level of the lubricating oil in the case fluctuates, so depending on the installation position of the suction portion, Lubricating oil may not be sucked in sufficiently. In this case, it is conceivable to fill the case with a large amount of lubricating oil in advance, but if the amount of lubricating oil is increased, the case must be sized according to the amount of lubricating oil. Will be changed.

One object of the power transmission device of the present invention is to more surely suck the lubricating liquid. Another object of the power transmission device of the present invention is to reduce the size of the device.

[0005]

Means for Solving the Problem and Its Action / Effect The power transmission device of the present invention employs the following means in order to achieve at least a part of the above objects.

The power transmission device of the present invention has a suction portion at a predetermined position inside the case for sucking the lubricating liquid filled up to a height at which at least a part of the gear installed inside the case is immersed. A power transmission device capable of transmitting power using the gear, wherein the predetermined position is the bottom of the case, and the liquid level of the lubricating liquid when the gear is rotating is the gear It is characterized in that the position is relatively higher than the liquid level of the lubricating liquid when stopped.

In the power transmission device of the present invention, the position of the suction portion for sucking the lubricating liquid filled in the case is at the bottom of the case, and the level of the lubricating liquid when the gear is rotating is the gear. Since the position is relatively higher than the liquid level when stopped, the lubricating liquid can be more reliably sucked by the suction portion even when the liquid level of the lubricating liquid is low to some extent. As a result, since it is not necessary to fill the amount of the lubricating liquid more than necessary, it is possible to reduce the size of the case, that is, the size of the device.

In such a power transmission device of the present invention,
The predetermined position may be in the front of the bottom of the case in the rotation direction of the gear. The front of the case bottom in the rotation direction of the gear is a portion where the liquid surface of the lubricating liquid when the gear is rotating is relatively higher than the liquid surface of the lubricating liquid when the gear is stopped. Therefore, the lubricating liquid can be more reliably sucked even when the gear is rotating.

Further, in the power transmission device of the present invention, a shield may be provided inside the case at least at a part of the periphery of the gear at a predetermined distance from the gear. it can. With this configuration, when the gear rotates, the shield stabilizes the liquid level of the lubricating liquid, so that the lubricating liquid can be more reliably sucked.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is a configuration diagram showing an outline of a configuration of a power transmission device 20 which is an embodiment of the present invention, and FIG. 2 is a configuration diagram showing a cross section taken along the line AA of the power transmission device 20 of FIG. As shown in the figure, the power transmission device 20 of the embodiment has a gear 28 provided on a rotary shaft 26 housed in a case 22 and rotatably supported by a plurality of bearings 24.
And an oil pump 30 for circulating a lubricating oil used for lubricating the gear 28 and the like. The gear 28 is meshed with another gear 29, and the rotary shaft 26 is engaged via both gears.
Power is transmitted to.

The bottom of the case 22 serves as a reservoir of lubricating oil used for lubricating the gears 28, 29 and other gears. The lubricating oil is filled, for example, to a height such that the liquid level of the lubricating oil is a position near the center of the rotary shaft 26 during normal operation. Further, an oil strainer 32 used for sucking the lubricating oil while removing a relatively large foreign substance mixed in the lubricating oil is installed at the bottom of the case 22. This oil strainer 32, as shown in FIG.
The gear 28 at the right corner of the bottom of the case 22 in the figure with respect to the vertical plane including the axis center of the rotating shaft 26, that is, at the bottom of the case 22.
It is located at the front corner in the direction of rotation. This corner is
Since the height of the liquid surface of the lubricating oil when the gear 28 rotates is the highest relative to the height of the liquid surface when the gear 28 is stopped, the lubricating oil is stirred by the rotation of the gear 28. As a result, even when the height of the liquid surface of the lubricating oil is deviated, sufficient suction of the lubricating oil by the oil strainer 32 can be ensured. Further, at the bottom of the case 22, the baffle plate 4 that covers the lower part of the tooth surface of the gear 28 in FIG.
0 is arranged, which suppresses the temperature rise of the lubricating oil due to separation and splashing of the lubricating oil in the high temperature state near the tooth surface of the gear 28, and causes a rapid change in the liquid surface of the lubricating oil due to the rotation of the gear 28. Can be suppressed to stabilize the liquid surface.

The rotation shaft of the oil pump 30 is the gear 2
8 is connected to the rotary shaft 26 of the gear 28 and the rotary shaft 2 of the gear 28.
It is adapted to be driven by rotation of 6. Case 22
The lubricating oil accumulated at the bottom is sucked from the oil strainer 32 by the drive of the oil pump 30 and is pressure-fed to the oil filter 36 side through the supply flow path 34, and foreign matter and wear mixed in the lubricating oil by the oil filter 36 are removed. After removing powder, carbon, etc., the powder is supplied to each part of the power transmission device 20 and other devices via the supply flow path 38. Then, the lubricating oil supplied to each part of the power transmission device 20, such as the gears 28 and 29, and each part of the other device, is transmitted to the wall surface of the case 22 while lubricating each part of the gears 28 and 29. And is stored again at the bottom of the case 22.

According to the power transmission device 20 of the embodiment described above, the oil strainer 32 for sucking the lubricating oil filled in the case 22 is arranged at the bottom of the case 22 in front of the gear 28 in the rotational direction. Even when the liquid level of the lubricating oil changes as the lubricating oil is stirred by the gear 28,
Sufficient suction can be secured. As a result, gear 2
Since it is not necessary to fill the lubricating oil in a large amount in consideration of the fluctuation of the lubricating oil level due to the stirring of No. 8, it is possible to suppress the case 22 that is accompanied by the increase in the amount of lubricating oil, that is, the increase in size of the power transmission device 20. In addition, it is possible to suppress an increase in the rotation resistance of the gear 28. Moreover, since the baffle plate 40 that covers the gear 28 is provided, the stirring of the lubricating oil can be suppressed, the liquid surface can be stabilized, and the suction from the oil strainer 32 can be made more reliable.

In the power transmission device 20 of the embodiment, the case 2
Although the baffle plate 40 that covers the gear 28 is provided in the unit 2, the baffle plate 40 may not be provided.

Although the embodiments of the present invention have been described with reference to the embodiments, the present invention is not limited to the embodiments of the present invention, and various embodiments are possible without departing from the gist of the present invention. Of course, it can be implemented in.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a configuration of a power transmission device 20 which is an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an AA cross section of the power transmission device 20 of FIG.

[Explanation of symbols]

20 power transmission device, 22 case, 24 bearing, 26 rotating shaft, 28, 29 gear, 30 oil pump, 32 oil strainer, 34 supply flow path, 36
Oil filter, 38 supply channels, 40 baffle plate.

Continued front page    (72) Inventor Masato Arimoto             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Yozo Mitsumori             3-1, Hinodai, Hino City, Tokyo 1 Hino             Inside the automobile corporation (72) Inventor Masao Kojima             3-1, Hinodai, Hino City, Tokyo 1 Hino             Inside the automobile corporation F term (reference) 3J063 AB02 AC01 BA11 BB41 CA01                       CD41 XD23 XD34 XD56 XD62                       XE18

Claims (3)

[Claims] 1. A suction unit for sucking a lubricating liquid filled to a height at which at least a part of a gear installed inside the case is immersed is provided at a predetermined position inside the case, and the gear is used. A power transmission device capable of transmitting power, wherein the predetermined position is the bottom of the case and the liquid level of the lubricating liquid when the gear is rotating is when the gear is stopped. A power transmission device, characterized in that the position is relatively higher than the liquid level of the lubricating liquid. 2. The power transmission device according to claim 1, wherein the predetermined position is a front portion of the bottom portion of the case in the rotation direction of the gear. 3. The power transmission device according to claim 1, further comprising: a shield installed inside the case at least at a part of the periphery of the gear with a predetermined distance from the gear. A power transmission device.