JPH0444923Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to power transmission devices for automobiles and the like.

[Prior Art] Conventionally, a power transmission device such as a differential that transmits power from an engine to left and right wheels, for example, is known as described in, for example, Japanese Patent Laid-Open No. 59-23159.

That is, in the differential, a differential case (differential case) is rotatably supported within a differential carrier filled with lubricating oil to a desired level.

On the outside of the differential case, there is a ring gear that meshes with the drive pinion leading to the engine, while inside the differential case there are a pair of output shafts that are interlocked and connected to the left and right wheels, side gears attached to the output shafts, and It has a structure that includes a pinion gear that meshes with the gear and revolves together with the differential case while rotating on its own axis during differential rotation.

[Problems to be Solved by the Invention] In this structure, the power input to the ring gear is transmitted to the pinion shaft, the pinion gear, the side gear, and the output shaft via the differential case that rotates together with the ring gear.

On the other hand, the lubrication inside the differential case is of a splash type in which lubricating oil splashed up by the rotation of the case is splashed onto the case and sent into the interior through an intake hole or the like provided in the case.

With this flip-up type, the amount of lubricant sent into the differential case is small because the differential case itself rotates, and the lubricant that is thrown up into the case is blown out in the radial direction by centrifugal force. This caused problems such as insufficient lubrication and poor efficiency.

Therefore, an object of this invention is to provide a power transmission device that can improve the efficiency of feeding lubricating oil into a transmission case such as a differential case.

[Means for Solving the Problems] In order to achieve the above object, this invention uses a gear transmission that transmits input power to the output side in a carrier filled with lubricating oil to a desired level. A transmission case equipped with a mechanism is rotatably mounted,
A throttle passage whose width narrows in the rotational direction of the case is formed between at least the inner wall of the carrier above the level surface of the lubricating oil and the transmission case, and the lubricating oil is guided into the transmission case within the throttle passage. There is a guide section to do this.

[Function] In such a power transmission device, the lubricating oil splashed up by the transmission case is dissipated in the throttle passage.
The lubricating oil is accelerated in the rotational direction and guided toward the transmission case in an accelerated state, and the guided lubricating oil is forcibly fed into the case through an opening provided in the case.

[Embodiment] Hereinafter, an embodiment of this invention will be described in detail with reference to the drawings of FIGS. 1 and 2.

In the figure, reference numeral 1 indicates a differential carrier filled with lubricating oil to a desired level P. Inside the carrier 1, a differential case 5 (hereinafter referred to as differential case) is installed by bearings 3, 3. ) is rotatably mounted.

An intake hole 7 that communicates with the inside is provided on the outside of the differential case 5, and a hollow shaft 9 connected to a drive pinion (not shown) is spline-coupled to the inside of the differential case 5. Inside the differential case 5 are a pinion shaft 15 that rotates together with the case 5, and a pair of pinion gears 1 that rotate around the shaft 15 during differential rotation.
1 and 11, and side gears 13 and 13 that are always engaged with the gears 11 and 11. Further, each of the side gears 13, 13 is attached to first and second output shafts 17, 17, respectively, which are interlocked and connected to left and right wheels (not shown).

On the other hand, between the inner wall of the carrier 1 above the level surface P of the lubricating oil and the differential case 5, a throttle passage 19 whose width becomes narrower in the direction of rotation of the case 5 is formed.

The throttle passage 19 has a function of increasing the flow velocity of the lubricating oil that is splashed up by narrowing the width in the rotation direction. Further, a guide portion 21 is provided in the throttle passage 19 to guide lubricating oil toward the differential case 5 side. The guide portion 21 has an integral shape that interlocks and projects from the inner wall of the carrier 1 toward the differential case 5 side.

In this structure, the differential case 5 is spline-coupled from a drive pinion (not shown) to a ring gear (not shown) via a hollow shaft 9 connected to the ring gear. As the differential case 5 rotates, power is transmitted from the pinion shaft 15 to the pinion gear 11 to the side gear 13 to the output shaft (not shown).

On the other hand, the lubricating oil splashed up by the rotation of the differential case 5 is accelerated by the throttle passage 19. The accelerated lubricating oil is guided by the guide portion 21 and enters the inside of the case 5 through the intake hole 7 of the differential case 5.

FIG. 3 shows another embodiment of the guide section 21, and the guide section 21 has a structure that allows the lubricating oil accelerated by the throttle passage to be guided into the case while further accelerating the lubricating oil.

Note that this embodiment can also be applied to a speed reduction device using a planetary gear or the like.

[Effects of the invention] As explained above, according to this invention, the lubricating oil splashed up by the case is forced into the case by the action of the throttle passage and the guide part. Since the lubricating oil can be sent out, the efficiency of feeding the lubricating oil into the case is improved, and a smooth lubricating state inside the case can be obtained.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the power transmission device of this invention, Figure 2 is a sectional view taken along the - line in Figure 1,
FIG. 3 is a partial sectional view showing another embodiment of the guide section. Explanation of main drawing symbols, 1...carrier, 5...
... Differential case (transmission case), 11 ... Pinion gear (gear transmission mechanism), 13 ... Side gear, 1
9... Throttle passage, 21... Guide section.

Claims (1)

[Scope of utility model registration request] A transmission case equipped with a gear transmission mechanism that transmits input power to the output side is rotatably mounted in a carrier filled with lubricating oil to the desired level.
A throttle passage whose width narrows in the rotational direction of the case is formed between at least the inner wall of the carrier above the level surface of the lubricating oil and the transmission case, and the lubricating oil is guided into the transmission case within the throttle passage. A power transmission device characterized by being provided with a guide section that