JPH0262413B2 - - 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 differential gear sets and differential side bearings that rotatably support gearboxes that house the differential gear sets in a differential case is performed using a differential gear set. Add lubricating oil until the gear set is immersed in oil, or use oil from the large drive gear of the differential gear set, which is the input member when the output of the transmission is input to the differential mechanism. They relied on the scattering of lubricant by the scraping up of the oil.

[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.

For this reason, the lubrication of the differential gear set and the side bearings becomes insufficient, so it may be possible to supply oil from a pressure source to the differential gear set for forced lubrication (Japanese Patent Laid-Open Publication No. 54-146326). however,
Due to the forced lubrication circuit, the lubricant supply mechanism does not take into account the lubrication of the side bearings.
It was not possible to evenly supply lubricant to the differential gear and side bearings.

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 oil level of the 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 a transaxle mechanism in which the differential gear set is housed within the differential case that constitutes a part of the transaxle case that houses the transmission, even if the oil level is low, the differential It has been desired to develop a lubricating device for a differential gear set that can sufficiently lubricate the differential mechanism.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a lubricating device that can sufficiently lubricate a differential gear set and side bearings even when the level of lubricating oil in a differential case is low. be.

[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. An oil gutter is disposed above the gearbox and has a gutter with a lubricating oil supply port formed in the lubricating oil supply window of the gearbox and a corresponding location of the side bearing, and the gutter of the oil gutter is configured to provide pressure for the transmission. a lubricating oil spouting member that supplies pressurized oil from an oil supply section; or a lubricating device for a differential mechanism, which is disposed on the large driving gear side and is scraped up from the large driving gear. an oil collecting section that collects the oil;
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. , an oil gutter having a gutter having a lubricating oil supply port formed at a corresponding location of the gearbox lubricating oil supply window and the side bearing, and supplying pressure oil from the pressure oil supply section of the transmission to the gutter of the oil gutter; a lubricating oil spouting member, or a lubricating device for a differential mechanism, which houses the large differential gear and a small differential gear meshing with the large differential gear and forms a lubricating oil supply window. a gutter disposed above the gearbox, having a wall capable of collecting lubricating oil scraped up by the gearbox, and having lubricating oil supply ports formed at corresponding locations of the gearbox lubricating oil supply window and the side bearings; A lubricating device for a differential mechanism, comprising: an oil gutter having an oil gutter; and a lubricating oil jetting member that supplies pressure oil from a pressure oil supply section of a transmission to a gutter of the oil gutter; an oil collecting section disposed on the gear side to collect lubricating oil scraped up from 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, and collects lubricating oil scraped up by the gearbox. an oil gutter, the oil gutter having a wall to obtain the lubricating oil from the oil collecting section, and a gutter having lubricating oil supply ports formed at corresponding locations of the gearbox lubricating oil supply window and the side bearing, respectively, to which the lubricating oil of the oil collecting section is guided; A lubricating device for a differential mechanism, characterized in that a lubricant jetting member for supplying pressure oil from a pressure oil supply section of a transmission to a gutter of the oil gutter is provided.

[Operation and Effects of the Invention] Lubricating oil is supplied from the pressure oil supply section of the transmission to the gutter of the oil gutter via the lubricating oil spouting member, and the lubricating oil is supplied to the lubricating oil supply window and side of the gear box of the gutter. Lubricating oil is distributed to the differential gear set and side bearings from the oil supply ports at the bearing locations.
Therefore, lubricating oil can be supplied to the differential mechanism even before the vehicle starts running, especially after the engine has started.

In addition to the lubricating oil from the lubricating oil spouting member,
When the lubricating oil collected in the oil collecting section is supplied to the gutter by scraping up by the rotation of the large drive gear, more lubricating oil can be used to lubricate the differential gear set and side bearings. can.

Furthermore, in addition to the lubricating oil spouting member, the lubricating oil scraped up by the rotation of the gearbox hits the wall of the gutter-shaped part of the oil gutter, and when it is supplied to the gutter, more lubricating oil is applied to the differential gear. It is possible to lubricate the set and side bearings. In this case, the lubricating oil spouting member can supply lubricating oil before the vehicle starts running, but after the vehicle starts, lubricating oil is also supplied to the gutter by scraping up the lubricating oil with the gearbox.

Additionally, in addition to being scraped up by the rotation of the lubricating oil spouting member and gear box, if lubricating oil is supplied to the gutter by scraping up by the rotation of the large drive gear, even more lubricating oil will be pumped into the differential gear set. Side bearings can be lubricated. The amount of lubricant oil scraped up by the large driving gear is small when the gear rotates at low speed, but at this time, the lubricating oil is sufficiently supplied to the gutter by scraping up by the lubricant jetting member and the gear box, which is not as tall as the large driving gear.
Furthermore, when the gear rotates at high speed, the amount of lubricating oil scooped up by the large driving gear naturally increases. This lowers the level of lubricating oil at the bottom of the differential case, reducing the amount of lubricating oil scooped up by the gearbox. Therefore, in this case, a sufficient amount of lubricating oil can be supplied to the gutter-like member of the oil gutter both during low-speed and high-speed rotation of the gear, and as a result, the differential gear set and side bearings are Effective lubrication.

[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 of it, 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.
and a differential gear set 4 consisting of large differential gears 44 and 45 which are spline-fitted to an axle (not shown).

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, 55 are interposed, and the gearbox is rotatably supported by the case 50 via these side bearings 54, 55. Oil seals 56 and 57 are fitted into the axle to seal the gap between the axle and the axle.

Boss portion 53 into which the outer race of side bearing 55 of differential case 50 is fitted
The bearing 55 is installed from above inside the case.
A lubricating oil supply hole 58 of the side bearing 55 is formed for supplying lubricating oil to the space created by 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 drive gear 31 upstream and the side bearing 55 downstream, and the window 37 of the gearbox in the 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 bearings 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 integrally formed with the gutter and the spout 72 is a lubricating oil spouting member, and the lubricating oil pressure oil supply passage 73 formed in the wall of the differential case 50 connects the stop plate 71 with the gutter. , 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.

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 82 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. 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 reliably supplies the scattered oil to the differential gear set 4 and the side bearings 55 even under operating conditions in which there is little oil being stirred and scattered by the large drive gear 31 when the vehicle is running at low speed. , differential gear set 4 when driving at medium and high speeds.
The lubricating oil supplied to 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-speed 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 end consists of 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 side bearing lubrication gutter 92 that is inclined downward toward the side bearing lubrication hole, and is configured to be used when moving forward. It consists of an inner wall 94 of the differential case above the gutter 92 which descends steeply in the direction of rotation of the gearbox 32. In this embodiment, the oil receiving plate 91 is integrally formed with a sheet metal on the side of the middle and downstream region of the gutter 6.

In this side bearing lubrication mechanism, oil mainly splashed by the gear box 32 and the large drive 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 gravity. 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. In this side bearing lubrication mechanism, side bearing lubrication gutter 9
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 9
2 may be arranged substantially horizontally with respect to the axial direction and/or rotational direction, for example, by making the side bearing side end a borderless end and the other end horizontal to the borderless end having a border. The oil on the gutter 92 sufficiently flows 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 diagram, 1... Transaxle mechanism, 2... Transmission, 3... Differential gear mechanism,... Differential gear set, 5...
Transaxle case, 6...Gutter, 7...Lubricating oil supply mechanism, 8...Scattered oil collection device, 9...Side bearing lubrication mechanism, 50...Differential case, 54, 55...Differential sial 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 that houses 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 that 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, which houses the large differential gear and a small differential gear that meshes with the large differential gear, and supplies lubricating oil. an oil gutter disposed above the gearbox having a window and having a gutter having a lubricating oil supply port formed at a corresponding location of the lubricating oil supply window of the gearbox and the side bearing; A lubricating device for a differential mechanism, comprising: a lubricating oil spouting member that supplies pressurized oil from a pressure oil supply section of a transmission. 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. , an oil gutter having a gutter having a lubricating oil supply port formed at a corresponding location of the gearbox lubricating oil supply window and the side bearing, and supplying pressure oil from the pressure oil supply section of the transmission to the gutter of the oil gutter; A lubricating device for a differential mechanism, comprising: a lubricating oil spouting member. 3. 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 that is connected to each other, the gear box houses the large differential gear and the small differential gear that meshes with the large differential gear, and forms a lubricating oil supply window. A gutter is disposed in an upper position and has a wall capable of collecting lubricating oil scraped up by the gearbox, and has a gutter with lubricating oil supply ports formed at corresponding locations of the gearbox lubricating oil supply window and the side bearing, respectively. A lubricating device for a differential mechanism, comprising: an oil gutter; and a lubricant jetting member that supplies pressurized oil from a pressure oil supply section of a transmission to a gutter of the oil gutter. 4 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 trans 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, and collects lubricating oil scraped up by the gearbox. an oil gutter, the oil gutter having a wall to obtain the lubricating oil from the oil collecting section, and a gutter having lubricating oil supply ports formed at corresponding locations of the gearbox lubricating oil supply window and the side bearing, respectively, to which the lubricating oil of the oil collecting section is guided; A lubricating device for a differential mechanism, comprising: a lubricating oil spouting member for supplying pressure oil from a pressure oil supply section of a transmission to a gutter of the oil gutter.