JPS6256665A - Lubricating device for four wheels driving vehicle - Google Patents

Abstract

PURPOSE:To improve convenience for mounting of oil pump by connecting the driving shaft of an oil pump, through a gear, to an output shaft which rotates in one with a front wheel or a rear wheel. CONSTITUTION:A rear wheel driving shaft 14, which rotates in one with the rear wheels of a four wheel driving vehicle, engages with the bevel gear 13a of a transfer drive gear supporting case 20 inside a transfer case 19 through a bevel gear 13b formed on its shaft end. On the other hand an oil pump 6 is installed on the inner peripheral surface of the transfer case 19, and its driving shaft 15 is connected to a transfer drive gear supporting case 18 through gears 5a, 5b. Depending upon this constitution, the oil pump 6 comes to be driven together with the rotation of the rear wheels and the oil pump can be driven, both at the full time operation and at the part time operation. Further, the oil pump is put in connection through a gear, so the size and the mounting position of the pump can be settled optionally.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a lubricating device installed in a four-wheel drive vehicle capable of simultaneously transmitting power to both front and rear wheels, and in particular to an oil pump assembly for circulating lubricating oil. The appendix is related to structure.

As is well known in the art, a four-wheel drive system distributes and transmits the power input from a manual transmission or an automatic transmission to both front and rear wheels, and is used in many vehicles and machinery such as clutch gears. In general, in a transverse front engine type four-wheel drive vehicle, there is a first differential gear that guarantees the difference in rotation speed between the front wheels and rear wheels, and an axle that controls the rotation speed of the left and right front wheels. Since the four-wheel drive device is equipped with a second differential gear that guarantees the same, there are more groove bottom members, and therefore, the four-wheel drive device is independently provided with a lubrication device including an oil pump.

Generally, the oil pump is a gear pump or trochoid pump, but conventionally, this type of oil pump was used as a power transmission shaft that transmits power to a part-time output shaft that rotates only when driving four-wheel drive. It was installed on the same axis (Japanese Patent Application No. 5'134767).

Problems to be Solved by the Invention However, in the past, in order to downsize the entire device, the power transmission shaft was constructed as a hollow shaft and was arranged coaxially with the full-time output shaft. Although the required installation space for the power transmission shaft can be reduced, its outer diameter must become larger.In addition, in the configuration in which the oil pump is attached to the outer periphery of the power transmission shaft, the power transmission shaft is attached to the oil pump. This becomes a drive shaft, and as a result, the oil pump itself has a large diameter. That is, in the conventional configuration, the size of the oil pump is limited by the diameter of the power transmission shaft, resulting in an increase in the size of the oil pump and, accordingly, a problem in that the four-wheel drive device itself increases in size. Furthermore, when the oil pump becomes larger than necessary, the discharge amount also becomes larger than necessary, which causes a problem of increased torque loss.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a lubricating device for a four-wheel drive vehicle, which can reduce the size of the oil pump and set its discharge amount appropriately.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first output shaft that is connected to the front wheels so as to rotate in the same direction at all times;
The second wheel is connected to the rear wheel so that it always rotates in the same direction as the rear wheel.
The lubricating device is characterized in that, in a transfer comprising an output shaft, a drive shaft of an oil pump is connected to either the first output shaft or the second output shaft via a gear.

Function: Therefore, since the lubricating device of the present invention is configured to transmit rotational force to the oil pump via gears, there are no particular restrictions on the installation location and size of the oil pump.
It can be installed in any size and location as needed. In addition, in this invention, the oil pump is rotated via the garden shaft by the rotation of the output shaft while traveling,
Accordingly, lubricating oil is circulated and supplied to the necessary locations via a predetermined oil path, and the rotation speed of the oil pump in this case can be determined by the ratio of the number of teeth of the gear, and the supply amount of the -C gauging draw is designed. It can be set to the required amount determined above.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an example in which the present invention is applied to a four-wheel drive transfer in a transverse front-engine vehicle.The transfer shown here transfers input from a transmission (not shown) to a first differential gear. 1
The differential gear 3 on the front wheel drive shaft 2, which is the first output shaft, is provided on the same axis as the first differential gear 1. It has a configuration in which an oil pump 6 is connected via a gear 5 to a power transmission shaft 4 to the rear wheel side, which is an output shaft.

That is, the input from the transmission is transmitted to cause the pinion gear 7 in the first differential gear 1 to revolve, and of the side gears 8 and 9 that mesh with this, the left side gear 8 in FIG. It is integrated with a pin supporting the pinion gear 10 to transmit power to the front wheels, and a hollow power transmission shaft 4 is integrated with the other side gear 9 to transmit power to the rear wheels. The front wheel drive @2 is integrated with the side gear 11.12 in the second differential A Lugya 3, and one front wheel drive lNl2 is rotatable relative to the power transmission @4 and fitted coaxially. ing. A wheel drive @14 is connected to the power transmission @4 via a pair of bevel gears 13. The drive shaft 15 of the oil pump 6 and the power transmission @4 are connected by a pair of gears 5 that mesh with each other.

In addition, in order to prevent the power from being transmitted to the front wheels in the event that the rear wheels slip and cause a sudden overturn, the first differential gear 1 is locked and the input to the first differential gear 1 is changed from the power input to the front wheels. A clutch mechanism 16 is provided that directly transmits information to the transmission shaft 4.

FIGS. 2 and 3 are sectional views of essential parts showing the above configuration in more detail, and the power transmission shaft 4 has the side gear 9 of the first differential gear 1 integrally formed at one end thereof. It consists of a central shaft 17 and a transfer drive gear support case 18 fitted to the outer periphery of the other end of the central shaft 17 via a spline. The transfer life gear support case 18 is supported by a pair of bearings 20 on the inner surface of the transfer life gear support case 18, and oil seals 21 are disposed at both ends outside the bearings 20 in the axial direction. The outer peripheral side of the intermediate portion has a lubrication system that is independent from other parts so that mutual circulation of lubricating oil does not occur.

A bevel gear 13a is attached to the intermediate portion of the transfer life gear support case 18, and a bevel gear 13b meshing with the bevel gear 13a is integrally formed at the end of the rear wheel drive shaft 14. The rear wheel drive shaft 14 is arranged perpendicularly to the power transmission @ 4 and is connected to the transfer case 1.
It is rotatably supported by a bearing 23 inside an X-tension housing 22 attached to 9. And the X-tension housing 2 provided with the bearing 23
The inside of the transfer case 2 communicates with the portion of the transfer case 19 that is partitioned by the oil seal 21 .

An oil pump 6 is housed and held by a cover plate 24 in a portion of the transfer case 19 that is defined by an oil seal 21 and opens into a cavity. The oil pump 6 installed here is a trochoid pump and must be connected to the transfer case 19 as shown in Figure 3.
The driven rotor 25 is rotatably accommodated in the hollow portion, and the drive rotor 26 is arranged relatively eccentrically on the inner circumferential side of the driven rotor 25.
Due to the rotation of the driven rotor 25 and the accompanying rotation of the driven rotor 25, the volume between the two increases and decreases.
The lubricating oil is sucked in through a suction port 27 formed in the transfer case 19 and sent out through a discharge port 28 formed in the transfer case 19 . In the inlet 27,
An oil strainer 29 located at a constriction partitioned by the oil seal 21 described above is communicated with the oil strainer 29, and an oil cooler 30 is communicated with the discharge port 28. An oil passage 31 is formed for supplying lubricating oil to a bush (not shown) supporting the rear wheel drive shaft 14 and the like. A drive shaft 15, which is an input shaft for the oil pump 6, is integrated with the drive rotor 26, and the cover plate 24 is integrated with the drive rotor 26.
It has been purchased from , and @ car 5 a is attached to its protruding end. A @ single 5b that roughly meshes with the teeth i5a is fixed to the outer circumference of the transfer gear 1 drive gear support case 18. Therefore, the oil pump 6 is configured to operate by receiving rotational force from the power transmission shaft 4.

By the way, the differential gear case 32 holding the pinion gear 7 in the first differential gear 1 has a cylindrical portion 33 coaxially fitted with the power transmission shaft 4, as shown in FIG. Cylindrical part 33
Clutch teeth 34 are formed on the outer periphery of the tip. In addition, a coupling sleeve 36 having clutch teeth 35 that engage with the clutch teeth 34 formed on the inner periphery of the tip constitutes the power transmission shaft 4 21P[I! The outer peripheral portion of the shaft 17 is provided with a spline so as to be non-rotatable and movable in the axial direction. These coupling sleeves 36 and each clutch @34.
By engaging the respective clutch teeth 34 and 35, the rotation of the differential case 32 is directly transmitted to the power transmission shaft 4, that is, the first differential gear 1 is locked, and each clutch tooth 3
By disengaging 4.35, the rotation of the differential case 32 is transmitted through the first differential gear 1! g4.

Therefore, in the above device, since the power transmission shaft 4 rotates when running in four-wheel drive, the rotational force is transferred to the gears 5a and 5.
It is transmitted to the oil pump 6 via b, and the oil pump 6 operates. In that case, the amount of lubricating oil discharged is proportional to the number of rotations, so by appropriately setting the number of rotations of the oil pump 6 according to the ratio of the number of teeth of the gears 5a and 5b, the amount of lubricating oil discharged is adjusted to the required amount without excess. It can be quantified. In addition, since the oil pump 6 (separated from the power transmission shaft 4) is located at a distance of L, there are particular restrictions on the diameter of the power transmission shaft 4. This also makes it possible to reduce the amount of lubricating oil discharged to the required amount.In addition, the entire device can be downsized.

Roughly speaking, in the above device, when the engine is stopped and the vehicle is towed, the rotational force of the rear wheels is transmitted to the power transmission shaft 4 via the bevel gears 13a and 13b, so the oil pump 6 is rotationally driven at the same time, so that the vehicle is towed. Lubrication can also be done inside.

In the above embodiment, the shaft that is the rotational drive source of the oil pump 6 is the power transmission shaft 4, but the present invention is not limited to the above embodiment (for example, as shown in FIG. 4). The rear wheel drive shaft 14 and the drive shaft 15 of the oil pump 6 may be connected via the gear 5, and the oil pump 6 may be driven by the rotational force of the rear wheel drive shaft 14.

Further, as the oil pump 6, a Gisset pump can be used instead of the trochoid pump.

Effects of the Invention As is clear from the above description, in this invention, the driving shaft of the oil pump is always connected to the first output shaft and the rear wheel, which are connected so as to rotate in the same direction as the wheels in the plane. Since the second output shaft, which is connected to rotate in the direction of the oil pump, is connected to either side through teeth, it is not restricted by the upside down direction of the oil pump. It is possible to reduce the size of the device to the necessary extent, so the entire device can be made smaller. Combined with the fact that the ratio of the number of teeth YH can be set appropriately, the amount of lubricating oil circulated can be suppressed to the required amount, and the torque can be reduced. Loss can be reduced. In addition, in this invention, when the wheels rotate, the oil pump also rotates, so even when the engine is stopped and the vehicle is being towed, the oil pump is rotated by the rotational force that is input from the wheels in the opposite direction. Lubrication can be performed.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing one embodiment of the present invention, Fig. 2 is a cross-sectional view of the main part showing its different structure, Fig. 3 is a schematic front view showing the structure of the oil pump, and Fig. 4 is a schematic diagram showing an embodiment of the present invention. Another embodiment of the present invention is shown in a schematic diagram. 2...Front wheel drive shaft, 4...Power transmission shaft, 5,5
a. 5b...Gear, 6...Oil pump, 14...
・Rear wheel drive shaft, 15... Drive shaft.

Claims (1)

[Claims] The first wheel is connected to the front wheel so that it always rotates integrally with the front wheel.
In a transfer comprising an output shaft and a second output shaft connected to the rear wheels so as to rotate integrally at all times, an oil pump drive shaft is attached to either the first output shaft or the second output shaft. A lubrication device for a four-wheel drive vehicle, characterized in that the two are connected via gears.