JPS60179549A - Differential gear - Google Patents

Abstract

PURPOSE:To suppress insufficiency of lubrication caused in the side of a differential gear case without any necessity for increasing a quantity of lubricating oil, by providing a restricting means, which limits a movement of the lubricating oil, between a housing and the differential gear case. CONSTITUTION:A restricting means 17, which limits a movement of lubricating oil from the peripheral side of a differential gear case 1 to the peripheral side of a ring gear 11, is provided between a housing 13 and the differential gear case 1. In this way, insufficiency of lubrication in a side of the differential gear case 1 can be suppressed without causing any necessity for increasing a quantity of the lubricating oil by enabling a level of oil to be prevented from lowering even if the lubrication oil is drawn by centrifugal force due to rotation of the ring gear 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a differential device used in a power transmission system of a vehicle or the like.

(b) Technical Background and Problems For example, there is a conventional differential device as shown in FIG. 1 (Japanese Patent Laid-Open Nos. 55-44026 and 17096-2/1980, etc.).

That is, a differential mechanism 107 having an inion gear 103 and a side gear 105 is housed within the differential case 101. An extension part 109 is integrally protruded from one end of the differential case 101, and a ring gear 111 is fixed to this extension part 109. The differential 7 differential case 101 and the ring gear 111 are housed in a housing 113 containing lubricating oil, and are rotatably supported via bearings 115.
Left and right drive shafts (not shown) are connected to the left and right side gears 105 of 07.

Therefore, when the ring gear 111 receives a rotational input, the left and right axles are rotationally driven via the differential case 101 and the differential mechanism 107. Further, when the left and right axles shift differentially due to cornering or the like of the vehicle, the differential mechanism 107 absorbs this. The ring gear 111 side and the differential case 101 side are lubricated by the ring gear 11 side and the differential case 101 side.
1 and differential 7 Rental case 101 scoops up and scatters the lubricating oil in housing 113 by its rotation.

However, since the outer diameter of the ring gear 111 is larger than the outer diameter of the differential case 101, when the ring gear 111 rotates at high speed, a considerable amount of the lubricating oil on the differential case 101 side is transferred to the housing 113 due to the centrifugal force caused by the rotation of the ring gear 111. It is pulled toward the ring gear 111 as shown by the arrow through the gap S between the two. As a result, the oil level on the deflunge 1r case 101 side is lowered, and the differential mechanism 107, bearing 115, etc. may lack lubrication, especially when the drive horn is moved to a higher elevation, which may lead to seizing or abnormal wear. .

On the other hand, it is possible to increase the amount of lubricating oil in advance by anticipating the drop in the oil level on the differential 7 lateral case 101 side, but on the other hand, the lubricating oil is There is a risk that this will result in resistance to rotation and power loss, and it has been difficult to improve lubrication ability and reduce power loss at the same time.

(c) Purpose of the Invention This invention was devised in view of the above-mentioned problems, and its purpose is to provide a differential device that can prevent insufficient lubrication on the differential case side without increasing the amount of lubricating oil. Ru.

(2) Structure of the Invention In order to achieve the above object, the present invention includes a differential case that accommodates a differential mechanism, and a differential case that is fixed to one end of the differential case and that operates a differential 77 differential mechanism by rotation input. In a differential device having a ring gear that integrally rotates a case, and a housing that accommodates the differential 77ncial case and the ring gear and retains lubricating oil, the differential 77nial is provided between the housing and the differential 77ncial case side. The structure includes a regulating means for regulating the movement of lubricating oil from the outer circumferential side of the case to the outer side of the ring gear.

(e) Example Hereinafter, one embodiment of the present invention will be described in detail.

The differential equipment according to an embodiment of the present invention has a second
It is constructed as shown in FIGS. 3 and 3, and is basically constructed substantially the same as the conventional example shown in FIG. That is, the differential mechanism 7 that drives a pair of pinion gears 3 and a pair of noid gears A75 is housed in the differential case 1. A ring gear 11 is fixed to a flange of an extension portion 9 protruding from one end of the differential 77 renial case 1. These differential 7runshirelkusu 1 and ring gear A711 are housed in a lubricating oil 13 and are rotatably supported via bearings 15, and each drive shaft (not shown) is connected to the nide gear A75. It is - [there is.

On the other hand, the ring gear 111 and the differential case 1
A lubricating oil movement regulating means 17, which is a main component of the present invention, is provided between the two sides.

The regulating means 17 regulates the movement of the lubricating oil in the /S housing 13 between the link gear 1f 11 side and the differential case 1 side, and has a throttle structure.

Specifically, on the outer periphery of the extension portion 9 formed in a trumpet shape so as to gradually expand toward the link gear A111 side,
An outer circumferential surface 19 that is substantially parallel to the rotation axis of the differential 7 renial case 1 is partially formed. In addition, the housing 13 is opposed to the above-mentioned extension part 9 with a gap S therebetween.
An inner circumferential surface 21 that is substantially parallel to the outer circumferential surface 19 is formed on the inner circumferential portion 13a of the inner circumferential portion 13a.
1 and 1 with a small gap m, and the interference length is -C. Therefore, by selecting the gap m and the interference length roughness, the lubricating oil movement inhibiting ability OL of the regulating means 17 is determined.

On the other hand, the housing 13 is divided into the ring gear 11 side, the differential 7, and the renial case 1 side.A rib 23 is integrally provided on the upper part of the ring gear 11 side. The lower end of this rib 23 is close to the outer periphery of the ring gear 11. An oil pocket 25 extending from the ring gear 11 side to the differential case 1 side is bored in the upper portion of the housing 13 on the differential case 1 side. The ring gear 11 side of the oil pocket 25 is
It is opened on the front side of the rib 23 with respect to the rotation of the ring gear 11, and is communicated with the differential case 1 side below through a passage 27.

Also, like the oil pocket 25, the passage 27 has a linguine (
The frontage is on the 711 side.

Next, the operation of the above embodiment will be described.

When the ring gear 11 receives the rotating mantle, the left and right drive shafts are rotationally driven via the differential armature case 1 and the differential mechanism 7. Furthermore, when the rotational speeds of the left and right drive shafts differ due to cornering of the vehicle, etc., the differential mechanism 7 absorbs this difference.

This is done by scooping up the lubricating oil in the housing 13 of the mechanical case 1 and the rotating housing 13 of the ring gear A711.

On the other hand, since the outer diameter of the ring gear 11 is larger than the outer diameter of the differential 7 differential case 1, the centrifugal force caused by the rotation of the ring gear 11 is still larger than the centrifugal force caused by the rotation of the differential case 1. Movement of the lubricating oil in the housing 13 between the case 1 side and the ring gear 11 side is regulated by an outer circumferential surface 19 and an inner circumferential surface 21 that face each other with a small gap m therebetween. Therefore, the movement of the lubricating oil in the housing 13 from the differential case 1 side to the ring gear A711 side is as follows:
It is regulated by the regulating means 17, and a drop in the oil level on the side of the differential 7 rental case 1 can be suppressed. For this reason,
By scraping up the lubricating oil as the differential case 1 rotates, the differential mechanism 7, bell ring 15, etc. can be smoothly lubricated, and the occurrence of burning, etc. can be suppressed.

On the other hand, since the regulating means 17 of this embodiment does not have a perfect seal structure, as the rotation continues, the lubricating oil moves little by little toward the ring gear 11 through the gap m. For this reason, although the oil level on the differential case 1 side tends to decrease over time, some of the lubricating oil scraped up by the ring gear 11 collides with the rib 23 and is guided to the oil pocket 25. 25 and is returned to the differential case 1 side via the passage 27, thereby suppressing a drop in the oil level on the differential case 1 side. This circulation also reduces deterioration of the lubricating oil on the differential case 1 side.

If the rotation speed marks are small, differential case 1
The amount of lubricating oil that is scooped up is reduced, but at this time, the oil that has accumulated at the back of the oil pocket 25 flows out and is used to lubricate the differential arrangement 1 full case 1 side.

FIG. 4 shows another embodiment, in which the regulating means 17 is constituted by an oil seal.

Therefore, relatively reliable sealing can be achieved, and movement of lubricating oil from the differential case 1 side to the ring gear A711 side can be substantially prevented.

Therefore, in this embodiment, no oil socket or the like is provided in the upper part of the housing 13. Since the other configurations are substantially the same as those of the above-mentioned embodiment, the same reference numerals will be given and the explanation will be omitted. In each of the above embodiments, the regulating means is provided between the differential range cell case and the housing, but it goes without saying that the regulating means may be provided between the differential case and the ring gear side surface ε housing that is integral with the differential case.

(F) Effects of the Invention As is clear from the above, according to the configuration of the present invention, the movement of lubricating oil from the outer circumferential side of the differential case to the outer circumferential side of the ring gear between the housing and the differential case side is controlled by the regulating means. can do. For this reason, even if the lubricating oil is drawn by the centrifugal force caused by the rotation of Ringgi Oni 7, differential arrangement 1? The r4 lubricating oil on the ring gear side is restricted from moving toward the ring gear side, and a drop in the oil level can be suppressed. Therefore, differential arrangement 1 without increasing the amount of lubricant? It is possible to suppress the lack of determination on the part of the case. In addition, in an embodiment in which the regulating means is configured to have a minute gap and an interference length between the differential 7 ratio 1 full case side and the housing, the lack of lubricating oil can be solved at low cost. Furthermore, in an embodiment in which the regulating means is an A seal, the shortage of lubricating oil can be more reliably resolved.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of a conventional example, Figure 2 is a vertical sectional view of an embodiment of the present invention, Figure 3 is a side view of an oil pocket, and Figure 4 is a side view of another embodiment. It is a partially omitted vertical cross-sectional view. 1... Differential case 7... Differential mechanism 11... Ring gear X713...
Housing 17...Regulating means ゛-...,,i:',;
,jl Figure 1 Figure 2

Claims (1)

[Scope of Claims] (1) A differential case that houses a differential mechanism, a ring gear that is fixed to one end of the differential case and rotates the differential case integrally by rotational input, and the differential case and the ring gear A7. In the differential gear system, the housing includes a housing that stores lubricating oil, and the lubricating oil is prevented from moving from the outer circumferential side of the differential case to the outer circumferential side of the ring gear between the housing and the differential gear case side. A differential device characterized by having a regulating means for regulating. <2) Claim 1, characterized in that the regulating means is configured such that the outer circumferential surface of the differential case and the inner circumferential surface of the housing have a minute gap and an interference length extending in the direction of the rotational axis of the ring gear. Differential device as described in section. (3) Claims characterized in that the regulating means is configured such that a side surface of a ring gear integral with the differential case and an inner circumferential surface of the housing have a minute gap and an interference length extending in the radial direction of the ring gear. The differential device according to item 1. (4) The differential seven-range variable device according to claim 1, wherein the regulating means comprises an oil seal fixed to one of the differential case side and the housing.