JPS6234833Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a differential limiting device for a vehicle.

Generally, when one wheel of a car gets stuck on a muddy or snowy road, the resistance (transmitted torque) of one wheel decreases, and due to differential operation, only the same torque can be transmitted to the opposite wheel. . Therefore, the driving torque of the entire vehicle becomes small, making it difficult to escape. In order to improve these problems, a differential limiting device is designed to limit the differential operation and increase the driving force.

However, conventional differential limiting devices have a structure that (i) limits the differential by the reaction force of a spring, and (ii) limits the differential by the rotational difference between the left and right axles. (iii) A structure in which the axle and the case of the differential gear are connected to prevent differential gear movement have been proposed. However, the above
For the structures (i), (ii), and (iii), the force that limits the differential is always constant, and in the structure (i) and (ii), the differential is reduced due to a decrease in spring force during the use process. The force that limits the differential becomes weaker, and because the differential is mechanical, there are problems that occur when limiting the differential. Furthermore, the above (iii)
However, due to its structure, it can only be used in either completely differential or non-differential states, which limits its range of use.

The object of the present invention was made in view of the above-mentioned problems, and is to provide a differential limiting device that improves the performance of differential control.

In order to achieve this purpose, the present invention
An oil chamber defined by first and second clutch plates is provided between the differential case and the side gear and into which oil in the oil pan can be introduced by a pump, and the first clutch plate is connected to the side gear. The differential gear is non-rotatably connected to the differential case with a slight gap therebetween, and is brought into contact with the side gear by the oil pressure in the oil chamber.

Hereinafter, details of the present invention will be explained using examples shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a differential limiting device according to the present invention. Code 1 is the differential case,
A ring gear 2 is fixed to the differential case 1 with bolts or the like, and the ring gear 2 is always in mesh with a drive pinion 3. Also,
A pinion shaft 4 is fixed to the differential case 1 in a vertically horizontal manner, and
A pair of pinion gears 5 and 6 are rotatably mounted at upper and lower end positions of the pinion shaft 4. Furthermore, side gears 7 and 8 are disposed within the differential case 1 in a state perpendicular to these pinion gears 5 and 6 and in constant meshing with these pinion gears 5 and 6, and these side gears 7 and 8 are connected to the axle shaft 9, 10 through a spline.

In the differential device configured as described above, the differential limiting device of this embodiment has first and second clutch plates 1 and 1 disposed between the differential case 1 and the side gears 7 and 8.
An oil chamber 13 defined by 1 and 12 is provided,
The oil chamber 13 is connected to the oil pan 14 through an oil pipe 16, a passage 17a in the oil ring 17, passages 9a and 10a in the axle shafts 9 and 10, and passages 7a and 8a in the side gears 7 and 8. It is configured such that oil is introduced by a pump 15 disposed midway through an oil pipe 16. A circumferential groove 17b communicating with the passage 17a is provided in the center of the surface of the oil ring 17 that slides on the axle shafts 9, 10.
The passages 9a, 10a of the rotating axle shafts 9, 10 are always in communication with the oil pipe 16, so that oil can be supplied to the oil chamber 13. In addition, the clutch plate 1 of the passages 7a and 8a of the side gears 7 and 8
1 and 12, circumferential grooves 7b and 8b communicating with the passages 7a and 8a are provided at positions facing the communication hole 13a to the oil chamber 13. This communication hole 13a serves as the only passage when no oil is supplied into the oil chamber 13, that is, when the first clutch plate 11 is closest to the second clutch plate 12.
When the clutch plate is separated from the second clutch plate, parts other than the communication hole 13a also communicate with the oil chamber 13. With the above configuration, the oil in the oil pan 14 can be introduced into the oil chamber 13 under the condition that the axle shafts 9, 10, etc. are rotationally driven. Further, the second clutch plate 12
is fixed in the differential case 1, while the first clutch plate 11 is always connected between the side gears 7 and 8 (because the oil chamber 13 is in a reduced pressure state when no oil pressure is built up in the oil chamber 13). The differential case 1 is disposed within the differential case 1 with a slight gap 18 between the edges thereof, and the protruding portion 11a is fitted into the groove 1a provided in the differential case 1, so that the differential case 1 rotates integrally with the differential case 1. is attached to. FIG. 4 is an enlarged sectional view of the oil ring 17, in which an oil seal 17c is disposed in the circumferential groove 17b, and the oil ring 17 and axle shaft 9
It is designed to prevent oil from leaking from the sliding surface. Figure 5 is an enlarged sectional view of the side gear 7 section.
Circumferential groove 7 of side gear 7 on both clutch plates 11, 12
A recess is formed in a portion facing b, and oil seals 11c and 12c are disposed within the recess to prevent oil from leaking from the contact surfaces between the side gear 7 and both clutch plates 11 and 12. Further, as shown in the figure, a recess is also formed on the outer circumferential side of both clutch plates 11 and 12, and an oil ring is placed inside the recess.
1d and 12d are provided to similarly prevent oil leakage.

Next, the operation of the apparatus configured as above will be explained. First, when the differential is not limited, the rotation of the drive pinion 3 is transmitted to the ring gear 2, and the differential case 1, pinion shaft 4, and pinion gears 5 and 6 rotate as one, and the revolution of the pinion gears 5 and 6 Accordingly, the side gears 7 and 8 move at the same rotational speed and in the same rotational direction, and the rotation of the side gears 7 and 8 causes the axle shafts 9 and 10 to rotate together. In this state, if a rotation difference occurs between the left and right axle shafts 9, 10, for example, if the right axle shaft 10 is fixed, in this case, in order for the pinion gears 5, 6 to revolve,
Since it has to roll on the right side gear 8 which is in a fixed state, it starts to rotate and drives the left side gear 7, and in the end, the left side gear 7 rotates 2 times the revolution of the pinion gears 5 and 6.
It will be driven at twice the rotational speed, and appropriate rotational force will be transmitted to the left and right axle shafts 9 and 10.

Here, when limiting the differential, first rotate the pump 15 with the switch 19, and then
The oil is pumped up from the oil chamber 1 through the oil pipe 16, passes through the passage 17a of the oil ring 17, passes through the passages 9a and 10a of the axle shafts 9 and 10, and the passages 7a and 8a of the side gears 7 and 8, and flows into the oil chamber 1.
The oil with increased pressure is sent into 3. Due to the increased pressure of the oil, the first clutch plate 11 is moved in the direction of the side gears 7, 8 and comes into contact with the side gears 7, 8, thereby causing the side gears 7, 8 and the first clutch to Frictional force acts between the plate 11 and the differential movement is limited.

Also, Figures 2 and 3 show the rotation and oil pressure of the pump, the rotation of the pump, the side gears 7 and 8, and the first
3 shows the relationship between the frictional forces of the clutch plate 11. The state indicated by A in FIG. 3 is a state in which the side gears 7, 8 and the first clutch plate 11 are brought together by the frictional force and are completely inoperable.

As explained above, according to the differential limiting device according to the present invention, oil pressure acts on the oil chamber provided between the side gear and the differential case, thereby causing the side gear and the first clutch forming the oil chamber to Since the structure is configured such that a frictional force acts between the plate and the differential to limit the differential, the conventional problems can be reliably eliminated and the performance of differential control can be improved, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the differential limiting device according to the present invention, and Figs. 2 and 3 show the rotation and oil pressure of the pump, the rotation of the pump, and the frictional force between the side gear and the first clutch plate. Diagram showing the relationship between
The figure is an enlarged sectional view of the oil ring portion, and FIG. 5 is an enlarged sectional view of the side gear portion. 1... Differential case, 7, 8... Side gear, 1
1...First clutch plate, 12...Second clutch plate, 13...Oil chamber, 14...Oil pan,
15...Pump, 18...Gap.

Claims (1)

[Scope of utility model registration request] between the differential case and the side gear.
The first clutch plate has an oil chamber defined by a clutch plate and into which oil in the oil pan can be introduced by a pump, and the first clutch plate is rotated by the differential case with a slight gap between it and the side gear. A differential limiting device characterized in that the differential limiting device is configured to be irremovably connected and to come into contact with a side gear by oil pressure in the oil chamber.