JPH0262412B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a lubricating device for a differential mechanism.

[Prior Art] In general, lubrication of a differential side bearing, in which a gear box housing a differential gear set is rotatably supported by a differential case, is carried out until the side bearing is immersed in oil. Either by adding oil or by splashing the lubricating oil by scraping up the oil by the large driving gear of the differential gear set, which is the input member when the transmission output is input to the differential mechanism. was.

[Problems to be Solved by the Invention] An automobile transaxle mechanism is a gearbox in which a differential gear set is housed inside a differential case that constitutes a part of a transaxle case that houses a transmission. is located. The differential gearbox is rotatably supported by the differential case via side bearings. In such a transaxle mechanism, for example, the engine is placed horizontally, and the rotation center axis of the large differential gear connected to the front axle is parallel to the rotation center axis of the output shaft of the transmission. In a transaxle for FF or RR vehicles in which the large driving gear is drivingly connected to the output shaft of the transmission, the lubricating oil in the connected transaxle case or differential case is When the oil level is high, the lubricating oil will flow more easily to the transmission part due to the agitation of the lubricating oil by the large driving gear of the differential gear set, and the agitation of the lubricating oil by the transmission part will increase. However, these agitation resistances increase power loss and increase the temperature of the lubricating oil, which may cause the problem of oil blowing out from the breather. Therefore, the oil level of the lubricating oil in the differential case cannot be made sufficiently high.

Further, when the transmission part is a planetary gear mechanism of an automatic transmission, the planetary gear mechanism is forcibly lubricated by pressure hydraulic oil from the hydraulic control mechanism of the automatic transmission, so the differential case If the level of lubricating oil in the transmission section is increased, agitation of the oil will occur in the transmission section, so the oil level must be set low.

In this way, in the transaxle mechanism in which the differential gear set is housed in the differential case that constitutes a part of the transaxle case that houses the transmission, even if the oil level is low, the side There is a desire for a lubricating device for differential gear sets that can sufficiently lubricate the bearings.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a lubricating device that can sufficiently lubricate a side bearing even at a low oil level.

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following configuration.

In other words, the differential case, which is part of the transaxle case that houses the transmission, is rotatably supported via side bearings, and the central axis of rotation of the large differential gear connected to the axle is located inside. A gear box housing a differential gear set parallel to the rotation center axis of the output shaft of the transmission, and a large drive gear that is an input member of the differential gear set are connected to the output shaft of the transmission. A lubricating device for a differential mechanism in a transaxle connected in a driving manner, wherein the large differential gear and the small differential gear meshing with the large differential gear are housed, and a lubricating oil supply window is formed. The oil gutter is disposed above the gearbox and has a wall capable of collecting lubricating oil scraped up by the gearbox, and has an oil gutter with a gutter forming a lubricating oil supply port at a location corresponding to the side bearing. a lubricating device of a differential mechanism, or an oil collecting section disposed on the side of the large driving gear to collect lubricating oil scraped up by the large driving gear; the large differential gear; and the large differential gear. The gear box is arranged above the gear box, which houses a small differential gear that meshes with the gear box and forms a lubricating oil supply window. A lubricating device for a differential mechanism, which is provided with an oil gutter having a collecting wall and a gutter having a lubricating oil supply port formed at a location corresponding to the side bearing.

[Operations and Effects of the Invention] As the gearbox scrapes up, the lubricating oil hits the wall of the gutter of the oil gutter, and the lubricating oil is supplied into the oil gutter. Therefore, lubricating oil is sufficiently supplied to the side bearing from the lubricating oil supply port along the gutter.

In addition, the lubricating oil collected by the oil gutter oil collection part by scraping up the large drive gear is supplied to the gutter.
More lubricant is supplied to the side bearings from the lubricant supply port.

At this time, if the gear rotates at low speed, the level of lubricating oil in the transaxle case is high;
In addition, since the gearbox has a low height, the gearbox can scoop up a large amount of lubricating oil. Further, when the gear rotates at high speed, the level of lubricating oil in the differential case decreases, and the amount of lubricating oil scooped up by the gear box decreases accordingly. However, at this time, if the lubricating oil scraped up by the large driving gear is thin in the oil gutter, the amount of lubricating oil scraped up by the large driving gear rotating at high speed will increase, so there will be a sufficient amount of lubricating oil in the gutter. Eventually, the side bearings will be sufficiently supplied with lubricating oil.

[Example] Next, the present invention will be explained based on an example shown in the drawings.

1 is a transaxle mechanism, 2 is a transmission, 3 is a differential mechanism, 4 is a differential gear set, 5 is a transaxle case, 50 is a differential case which is a part thereof, 6 is a differential case. Final case 5
This is a gutter that is fixed in the 0 and placed above the differential gear set.

The differential mechanism 3 includes a large drive gear 31 meshed with an output gear 21 of the transmission.
, the large drive gear 31 is on one side (the left side in the figure,
The same applies hereinafter), and sleeves 35 and 36 are protruded to form insertion holes 33 and 34 for the axle, which is the output shaft, on both sides in the rotation axis direction, and lubrication windows 37 and 38 are formed on the circumferential side. A gearbox 32, a support shaft 41 fixed to the gearbox, and a pair of differential small gears 42, 4 rotatably supported by the support shaft 41.
3 and the pair of differential small gears 42 and 43, respectively.
A differential gear set 4 includes large differential gears 44 and 45 that are spline-fitted to an axle (not shown) and mesh with the axle.

The differential case 50 is provided with cylindrical boss portions 52, 53 coaxially with the sleeves 35, 36 of the gearbox, and between the inner peripheries of the boss portions 52, 53 and the sleeves 35, 36, Differential side bearings 54 and 55 are interposed, and the gearbox is rotatably supported by the case 51 via these side bearings 54 and 55. Oil seals 56 and 57 are fitted into the axle to seal the gap between the axle and the axle.

Boss portion 5 into which the outer race of side bearing 55 of differential case 50 is fitted
Bearing 5 is installed from above inside the case of 3.
A lubricating oil supply hole 58 of the side bearing 55 is formed for supplying lubricating oil to the space created by the side bearing 5 and the oil seal 57.

In this embodiment, the oil gutter consists of a gutter 6, a stop plate 71 of a lubricating oil supply mechanism 7, and a scattered oil collection device 8. The gutter 6 is fastened to the inner wall of the differential case 50 with bolts 61 and 62, with the large driving gear 31 located upstream, the side bearing 55 located downstream, and the gearbox windows 37 and 3 located midstream.
A differential gear set lubricating port 63, which is a hole in this embodiment, is formed at a position above the lubricating oil supply hole 58 of the side bearing 55, and the downstream end is set above the lubricating oil supply hole 58 of the side bearing 55. In this example, a gutter-shaped lubricating oil supply port 64 is used. Further, a rib 66 is formed in the center of the gutter 6 to divert the lubricating oil supplied from upstream, and the differential gear set lubricating port 63 is formed on one side of the divided flow. Thereby, the amount of lubricating oil supplied to the differential gear set 4 and the side rings 55 can be appropriately distributed. The gutter 6 has a wall 67 that collects lubricating oil scraped up by the gearbox 32 into the gutter 6.

7 is a lubricating oil supply mechanism consisting of a stop plate 71 provided above the upstream 65 of the gutter 6 and a lubricant oil spout 72 that spouts lubricant in the direction of the stop plate 71;
In this embodiment, the stop plate 71 is formed integrally with the gutter by sheet metal molding, and the spout 72, which is a lubricating oil spouting member, connects to a pressure oil supply path 73 for lubricating oil formed within the wall of the differential case 50. It consists of a plug 75 with an orifice 74 fitted into the outlet of the pressure oil supply oil passage 73. If the transmission is an automatic type controlled by a hydraulic control device, this pressure oil supply path 73 is connected to a lubricating oil supply path of the hydraulic control device, and if the transmission is a manual type, an oil pump is installed. and is connected to the oil pump discharge port. This lubricating oil supply mechanism 7 supplies the differential gear set 4 and side bearings 55 before starting the vehicle.
Since the engine is forcibly lubricated, even if the vehicle has been left unused for a long time and the differential gear set is out of oil, it will start smoothly. Furthermore, even when the vehicle is running at low speed and the amount of oil splashed by the large drive gear, gear box, etc. is small, the necessary amount of lubricating oil can be supplied. Furthermore, since the gutter 6 is used to form the lubricating oil supply passage, clogging of the lubricating oil spouting orifice that would occur if the lubricating oil supply passage was formed by a pipe and an orifice formed in the pipe is prevented. Ru.

8 is a large driving gear 3 provided upstream 65 of the gutter 6
This is a scattered oil collection device based on 1, and a large driving gear 31.
A shroud 81 disposed in the upper outer circumferential direction and a guide plate 8 that guides oil adhering to the shroud 81 and flowing in the rotational direction of the large drive gear to the upstream 65 of the gutter 6.
It consists of 2. In this embodiment, the guide plate 82 and the shroud 81 are manufactured integrally with the gutter 6 by bending a sheet metal. This scattered oil collecting device 8 is
Even under operating conditions where there is little oil being stirred and scattered by the large drive gear 31 during low-speed driving, the scattered oil is reliably supplied to the differential gear set 4 and the side bearings 55, and during medium-speed and high-speed driving. The lubricating oil supplied to the differential gear set 4 and the side bearings 55 is increased according to the rotational speed, and sufficient lubricating oil is supplied to the differential gear and the side bearings during medium and high running.

Reference numeral 9 denotes a side bearing lubrication mechanism, which is inclined in the direction of the side bearing 55 or is arranged almost horizontally, and which lubricates the gearbox 32 during forward travel.
an oil receiving plate 91 which is inclined in the direction of rotation of the oil receiving plate 91 and whose edge 95 is slightly bent upward; and a fin 93 which projects from the inner wall of the differential case and comes into contact with the edge 95 of the oil receiving plate 91. The other side is a side bearing lubrication gutter 92 which serves as a lubricating oil supply port to the lubricating oil supply hole 58 of the side bearing 55, and a gearbox which is inclined downward toward the side bearing lubrication hole and serves as a gearbox during forward travel. The inner wall 94 of the differential case above the gutter 92 steeply descends in the direction of rotation of the differential case 32. Oil receiving plate 9
1 is integrally formed with a sheet metal on the side of the middle and downstream region of the gutter 6 in this embodiment.

In this side bearing lubrication mechanism, oil mainly splashed by the gear box 32 and the large driving gear 31 adheres to the case inner wall 94 and falls along the case inner wall or onto the oil receiving plate 91 due to the action of power. The oil slides down to the side bearing lubrication gutter 92, which is composed of an oil receiving plate 91 and fins 93, and flows downstream on the gutter 92 into the lubrication hole 58, and the side bearing 55 at high speed. Eliminate the lack of lubrication. Side bearing lubrication gutter 9 in this side bearing lubrication mechanism
2 can be configured with only the fins 93 and the case inner wall 94 by making the fins 93 protrude greatly to form a groove, and can also be configured with only the oil receiving plate 91 by increasing the bending of the edge 95. This gutter 92
The gutter 92 may be arranged almost horizontally with respect to the axial direction and/or the rotational direction. The upper oil flows sufficiently toward the side bearing 55.

Note that the side bearing 54 is lubricated by the inflow from the transmission, and normally lack of lubrication does not occur.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a lubricating device for a differential mechanism according to the present invention, FIG. 2 is a plan view, FIG. 3 is a side sectional view, and FIG. 4 is a perspective view of essential parts. In the figure, 1... is a transaxle mechanism, 2... is a transmission, 3... is a differential mechanism,... is a differential gear set, 5... is...
... Transaxle case, 6 ... Gutter, 7 ... Lubricating oil supply mechanism, 8 ... Splashed oil collection device, 9 ... Side bearing lubrication mechanism, 50 ... Differential case, 54, 55 ... Differential allencial side bearing.

Claims (1)

[Scope of Claims] 1. A large differential gear that is rotatably supported via side bearings in a differential case that constitutes a part of a transaxle case that houses a transmission, and that is internally connected to an axle. A gear box housing a differential gear set whose rotation center axis is parallel to the rotation center axis of the output shaft of the transmission, and a large drive gear which is an input member of the differential gear set are connected to the transmission. A lubricating device for a differential mechanism in a transaxle drivingly connected to an output shaft of a transaxle, the large differential gear and the small differential gear meshing with the large differential gear are housed and the lubricating oil is supplied. An oil gutter that is disposed above the gear box forming a window, has a wall capable of collecting lubricating oil scooped up by the gear box, and has a gutter with a lubricating oil supply port formed at a corresponding location of the side bearing. A differential mechanism lubricating device characterized by a gutter. 2 The differential case, which is part of the transaxle case that houses the transmission, is rotatably supported via side bearings, and the central axis of rotation of the large differential gear connected to the axle is connected to the transaxle. A gear box that houses a differential gear set parallel to the rotation center axis of the output shaft of the transmission, and a large drive gear that is an input member of the differential gear set that is driven to the output shaft of the transmission. In the lubricating device for a differential mechanism in a transaxle connected to each other, an oil collecting section is arranged on the side of the large driving gear and collects lubricating oil scraped up by the large driving gear;
The gearbox is disposed above the gearbox which houses the large differential gear and the small differential gear that meshes with the large differential gear and forms a lubricating oil supply window, through which lubricating oil from the oil collecting section is guided. and an oil gutter having a wall for collecting lubricating oil scraped up by the gearbox, and a gutter having a lubricating oil supply port formed at a corresponding location of the side bearing. Lubricating device for the differential mechanism.