JP2774016B2 - Differential device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential device used for a vehicle or the like.

[0002]

2. Description of the Related Art Generally, in a differential device for a vehicle, various measures have been taken to apply a sufficient rotational force to a tire that has not caused a slip when one wheel slips. Kaisho 59-973
For example, there is one disclosed in Japanese Patent Publication No. 46-46.

In this differential device, a plurality of pairs of receiving holes are formed in an inner peripheral portion of a case, left and right side gears connected to left and right torque shafts are rotatably provided in the case, and first and second side gears are provided in the receiving holes of the case. The first pinion gear is provided with first and second gear portions, the second pinion gear is provided with third and fourth gear portions, and the left side gear is provided with the first pinion gear. The first gear portion of the first pinion gear meshes with the first gear portion of the first pinion gear, and the right side gear meshes with the fourth gear portion of the second pinion gear. The first gear portion of the first pinion gear engages with the second pinion gear. The third gear portion and the fourth gear portion of the second pinion gear are connected to the first gear portion.
Are respectively engaged with the second gear portion of the pinion gear.

According to such a differential device, when the first and second pinion gears rotate, friction is generated between each of the pinion gears and the receiving hole, and the pinion gears press each other. The rotation of the slipping tire is restricted, and the rotational force is transmitted to the non-slip tire as a reaction force. Therefore, at the time of one-wheel slip, the rotational force is transmitted to the tire that has not slipped, and running performance on a rough road or the like can be secured.

[0005]

However, in this conventional differential device, the side wall of the case must be provided outside the first and second pinion gears in the axial direction, and the height of the case in the axial direction is increased. Therefore, it has been difficult to reduce the size and weight of the differential device.

Further, since the entire outer periphery of each gear portion at the meshing portion between the first pinion gear and the second pinion gear is not accommodated, the meshing state of both pinion gears is always maintained accurately. However, the durability and quietness of the pinion gear were not sufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. It is an object of the present invention to securely support a pinion gear and reduce the size and weight of the entire apparatus. Another object of the present invention is to provide a differential device capable of improving the durability and quietness of a pinion gear.

[0008]

In order to achieve the above object, the present invention provides a case which is rotated by the driving force of an engine, and a first shaft formed on a side wall at one end of the case and through which a first shaft is inserted. A hole, a second shaft hole formed in the side wall at the other end of the case, through which a second shaft is inserted, and a first shaft provided on the outer periphery of the first shaft and rotating together with the first shaft in the case. Side gear and the second gear
A second side gear provided on the outer periphery of the shaft and rotating with the second shaft in the case, a first gear portion meshing with the first side gear at one end, and a second gear portion at the other end A first pinion gear formed with a first pinion gear, and a third gear meshed at one end with a first gear portion of the first pinion gear.
And a second pinion gear formed at the other end with a fourth gear portion that meshes with the second side gear and meshes with the second gear portion of the first pinion gear. A differential device, wherein a plurality of pairs of receiving holes are formed in the one end side wall and the other end side wall at predetermined intervals along the outer periphery of the first shaft hole and the second shaft hole. The first pinion gear and the second pinion gear are rotatably supported by the accommodation hole, and the first pinion gear and the second pinion gear are meshed with the accommodation hole in the side wall. There is a configuration.

[0009]

[Function] When the load on one side gear decreases,
The pinion gear meshing with the side gear tries to move in the rotation direction. However, since the moving speed of the case is slower than the moving speed of the pinion gear, the pinion gear rotates while rubbing with the receiving hole, and the pinion gears move together. Are engaged while pushing. For this reason, the rotational force of the other side gear is limited, and the other side gear rotates as a reaction force to obtain an output torque.

Further, since the first and second pinion gears are supported at both ends by the housing holes in both side walls of the case, the supporting state of the pinion gears is ensured.

Further, the first pinion gear and the second pinion gear mesh with each other in the receiving holes in both side walls of the case in which the entire circumference of each gear portion is covered. Is maintained in a good state, and
The height of the case in the rotation axis direction is reduced.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view (an AA sectional view of FIG. 2) of one embodiment of a differential device according to the present invention, FIG. 2 is a side view of the differential device of FIG. 1, and FIG. It is BB sectional drawing of a differential device, and demonstrates from the structure.

The case 1 includes a case body 3 and a cover 5, and is rotated by driving an engine (not shown) mounted on a vehicle. The storage room 7 in the case 1 includes the case 1
First shaft 9 and second shaft 1 concentric with the rotating shaft of
1 is rotatably inserted into the case body 3, a first shaft hole 13 through which the first shaft 9 is inserted, and a second shaft 11 through which the second shaft 11 is inserted into the cover 5. Shaft hole 1
5 are formed.

First shaft 9 inserted into case 1
A first side gear 17 and a second side gear 19 are respectively engaged with the outer peripheral portion of the second shaft 11.

A pair of housing holes 21 and 23 are formed in the case body 3 and the cover 5 along the outer periphery of the first shaft hole 13 and the second shaft hole 15 so as to penetrate at four places. Locking projections 25, 27 are provided axially outside of the accommodation holes 21, 23.
Is protruding. Further, an opening 28 opened to the accommodation chamber 7 is provided on the rotation shaft side at the axial center of the accommodation holes 21 and 23.
Are formed.

In one of the pair of receiving holes 21 and 23,
The first pinion gear 29 is housed in a floating state, and the other pinion gear 31 is housed in a floating state. The two pinion gears 29, 31 are provided with locking portions 25, 2
7 prevents movement in the axial direction.

A first gear portion 33 is formed at the end of the first pinion gear 29 on the case body 3 side, and a second gear portion 35 is formed at an end on the cover 5 side. Similarly,
A third gear portion 37 is formed at an end of the second pinion gear 31 on the case body 3 side, and a fourth gear portion 37 is formed on an end of the second pinion gear 31 on the cover 5 side.
Gear portion 39 is formed.

Both ends of a pair of the first pinion gear 29 and the second pinion gear 31 are provided with receiving holes 21a, 21b, 2 in the side walls of both ends of the case 1 where the opening 28 is not formed.
The first gear portion 33 and the third gear portion 37, and the second gear portion 35 and the fourth gear portion 39 are accommodated in the accommodation holes 21a, 21b, 23a, and 23b. Is engaged with.

The center sides of the first gear portion 33 and the fourth gear portion 39 protrude from the opening 28 of the case body 3 into the accommodation chamber 7 and are respectively connected to the first side gear 17 and the second side gear 19. Are in mesh. The first and second pinion gears 29 and 31 are connected to the first and second side gears 17 and
Since there are a plurality of pairs on the circumference of 19,
Second side gears 17, 19 are supported in the radial direction.

The case 1 of the differential device thus configured is held on the vehicle body by bearings (not shown). A gear (not shown) is attached to an outer peripheral portion of the case 1, and the torque of the engine is input to the gear via a power transmission device. The first and second shafts 9 and 11 are respectively linked to left and right axles of a vehicle (not shown).

Next, the operation of the differential device according to this embodiment will be described.

When the vehicle is traveling straight, the first side gear 17 and the second side gear 19 do not move relative to each other, so that the first pinion gear 29 and the second pinion gear 31 do not move relative to each other. That is, by driving the engine, the case 1 rotates in the direction of the arrow X via the power transmission device, and the second pinion gear 31 receives the force in the X direction from the housing hole 23 of the case 1 and the second side gear 19 The first pinion gear 29 receives the force in the X direction from the housing hole 21 of the case 1 and transmits the force to the first side gear 17. Thereby, the first and second shafts 9 and 11 rotate.

When the vehicle turns, the first side gear 17 and the second side gear 19 tend to rotate relative to each other. As shown in FIGS. 2 and 3, for example, the first side gear 17
However, if you try to move in the X direction earlier than Case 1,
The first pinion gear 29 rotates in the Y direction, and the second pinion gear 31 meshes with the first pinion gear 29.
Rotate in the Z direction. For this reason, the second side gear 19 meshing with the second pinion gear 31 is
The case 1 is rotated in the anti-X direction. That is, the first
Can rotate faster than the second side gear 19, so that the vehicle can easily turn.

Case 1, One, One
The movements of the second pinion gears 29, 31 and the first and second side gears 17, 19 are the same as during the turning of the vehicle.
For example, when the coefficient of friction between the tire on the first side gear 17 side and the road surface is smaller than that on the second side gear 19 side, the first side gear 17 tries to rotate in the X direction faster than the case 1, and The meshed first pinion gear 29 also attempts to move in the X direction.

However, the X of the housing holes 21 and 23 of the case 1
The direction in which the first pinion gear 29 and the second pinion gear 31 move is smaller than the speed in which the first and second pinion gears 29 and 31 move.
Means that friction is generated between the receiving holes 21 and 23, respectively, and the gears rotate while pressing the tooth surfaces of the gears meshed with each other.

Therefore, the rotation of the first side gear 17 is restricted, and the second side gear 19 rotates as a reaction force. In other words, a rotational force larger than the slipping tire by the amount of the reaction force is transmitted to the tire that has not slipped, the running is resumed by the traction force, and the one-wheel slip state can be released.

The transmission of force between the case 1 and the first and second pinion gears 29 and 31 and between the pair of first and second pinion gears 29 and 31 is performed by the first and second pinion gears. Since it is performed at two places on both ends of the first and second pinion gears 29 and 31, the first and second pinion gears 29 and 31 can be used without a pinion shaft.
Is always kept parallel to the axes of the first and second side gears 17 and 19, and the contact between the two is improved.

Further, first and second pinion gears 29,
31 are inserted into receiving holes 2 formed in both side walls of case 1.
The first and second pinion gears 29, 3 are supported from all around by 1a, 21b, 23a, 23b.
1 is more reliable.

Further, the first pinion gear 29 and the second pinion gear 31 are connected to the housing holes 2 in the side walls at both ends of the case 1.
1a, 21b, 23a, 23b, the pinion gears 29, 31 are accurately maintained in mesh with each other.
The durability and quietness of the two pinion gears 29 and 31 can be improved, and the height of the case 1 in the direction of the rotation axis can be reduced, so that the differential device can be reduced in size and weight.

In this embodiment, each of the receiving holes 21 and
The first and second pinion gears are supported at both ends by providing an opening 28 at the center with the through hole 3 as the through hole, and the other end is supported by the accommodation holes 21 and 23. The receiving holes 21a, 21b, 23a, 23b facing the side walls at both ends of the case 1 are respectively formed, and the inner peripheral diameter of the receiving chamber 7 inside the case 1 is set to each of the receiving holes 21a, 21b, 23a,. The first and second pinion gears are formed so as to substantially coincide with the outermost circumference of the rotation shaft 23b in the radial direction of the rotation shaft, and support the first and second pinion gears in the side wall receiving holes 21a, 21b and 23.
a and 23b alone.

[0032]

As described above, according to the present invention, there is provided a differential device which can output a signal to the other side gear satisfactorily when the load on the one side gear is reduced and can travel on a rough road or the like. It is possible to securely support the pinion gear, reduce the size and weight of the entire device, and improve the durability and quietness of the pinion gear.

[Brief description of the drawings]

FIG. 1 is a front sectional view (AA sectional view of FIG. 2) of one embodiment of a differential device according to the present invention.

FIG. 2 is a side view of the differential device of FIG.

FIG. 3 is a sectional view of the differential device taken along line BB of FIG. 1;

[Explanation of symbols]

 1 Case 9 1st shaft 11 2nd shaft 13 1st shaft hole 15 2nd shaft hole 17 1st side gear 19 2nd side gear 21a accommodation hole 21b accommodation hole 23a accommodation hole 23b accommodation hole 29 1st Pinion gear 31 Second pinion gear 33 First gear part 35 Second gear part 37 Third gear part 39 Fourth gear part

Claims (1)

(57) [Claims] 1. A case which is rotated by a driving force of an engine, a first shaft hole formed in a side wall at one end of the case and through which a first shaft is inserted, and a second shaft formed in a side wall at the other end of the case. A second shaft hole through which the first shaft is inserted, a first side gear provided on the outer periphery of the first shaft and rotating together with the first shaft in the case, and a second side hole provided on the outer periphery of the second shaft. A second side gear rotating with the second shaft in the case, and the first side gear at one end.
A first pinion gear in which a first gear portion meshing with the first side gear is formed and a second gear portion is formed on the other end, and a first gear portion meshing with the first gear portion of the first pinion gear at one end. A second pinion gear formed with a third gear portion and a fourth gear portion formed at the other end to mesh with the second side gear and to mesh with the second gear portion of the first pinion gear; A plurality of pairs of receiving holes formed at predetermined intervals along the outer periphery of the first shaft hole and the second shaft hole on the one end side wall and the other end side wall. And
The first pinion gear and the second pinion gear are rotatably supported by the accommodation hole, and the first pinion gear and the second pinion gear mesh with the accommodation hole in the side wall. A differential device characterized by the following.