JPH05280596A - Differential gear - Google Patents

Abstract

PURPOSE:To attain smallness in size and lightness in weight by providing the first pinion gear formed with the first gear part in one end and the second gear part meshed with the second side gear in the other end, second pinion gear meshed with the first side gear and the first gear part and a receiving hole for each pinion gear. CONSTITUTION:Force in an X direction is transmitted from a receiving hole 23 to a side gear 17, in a pinion gear 31, and from a receiving hole 21 to a side gear 19, in a pinion gear 29, at straight advancing time, to rotate shafts 9, 11. When the side gear 19 tends to move in the X direction earlier than a case 1 at turning time, the pinion gear 29 is rotated in a Y direction, and the pinion gear 31 is rotated in a Z direction. Consequently, the side gear 17 is rotated in an opposite X direction, and since the side gear 19 can be rotated earlier than the side gear 17, turning is facilitated. Even at one wheel slip time, operation is similar to at the turning time. Since the pinion gears 29, 31 are meshed in receiving holes 21a, 23a, height in the rotary shaft direction of the case 1 can be decreased while accurately maintaining meshing, so that smallness in size and lightness in weight can be attained.

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 vehicles and the like.

[0002]

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

In this differential device, a plurality of pairs of accommodation holes are formed in the inner peripheral portion of the case, and right and left side gears connected to the left and right torque shafts are rotatably provided in the case. The second pinion gear is rotatably accommodated, the first and second gear parts are provided in the first pinion gear, the third and fourth gear parts are provided in the second pinion gear, and the left side gear is The first side of the second pinion gear is engaged with the first side of the first pinion gear while the right side gear is engaged with the fourth side of the second pinion gear. The third gear part and the fourth gear part of the second pinion gear are firstly arranged.
Of the pinion gears are meshed with each other.

According to such a differential device, when the first and second pinion gears rotate, friction is generated between each pinion gear and the accommodation hole, and both pinion gears press each other. The rotation of the slipping tire is limited, and the reaction force is transmitted to the non-slip tire. Therefore, when one wheel slips, the rotational force is transmitted to the tires that have not slipped, and running performance on a rough road can be secured.

[0005]

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

Further, since the entire outer circumference of each gear portion at the meshing portion of 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.

The present invention has been made in order to solve such a conventional problem, and an object thereof is to securely support a pinion gear and to 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 is directed to a case which is rotated by a driving force of an engine and a first shaft which is formed on a side wall at one end of the case and which is inserted through a first shaft. A hole, a second shaft hole formed in a side wall at the other end of the case and through which a second shaft is inserted, and a first shaft hole provided on the outer periphery of the first shaft and rotating with the first shaft in the case. Side gear and the second
A second side gear that is provided on the outer periphery of the shaft and that rotates with the second shaft in the case, and a second gear part that has a first gear part formed at one end and meshes with the second side gear at the other end. A first pinion gear formed with a second pinion gear that meshes with the first side gear and meshes with a first gear portion of the first pinion gear, and communicates with the side wall of the one end. The first and second shaft holes are formed at predetermined intervals along the outer periphery of the first and second shaft holes, and the first pinion gear and the second pinion gear are rotatably housed therein. The pinion gear and the second pinion gear are meshed in the side wall at the one end.

[0009]

[Operation] When the load applied to one side gear decreases,
The pinion gear that meshes with this side gear tries to move in the rotation direction, but since the moving speed of the case is slower than the moving speed of the pinion gear, the pinion gear rotates while rubbing against the accommodation hole, and the pinion gears are in contact with each other. Mesh while pushing each other. Therefore, the rotational force of the other side gear is limited, and the other side gear rotates as a reaction force to obtain the output torque.

Further, since the first pinion gear and the second pinion gear are meshed with each other in the accommodating hole in the side wall of the case where the entire circumferences of both gear parts are covered, the two pinion gears can be engaged. The meshed state is maintained in a good state, and the height of the case in the rotation axis direction is reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view (a sectional view taken along the line AA in FIGS. 3 and 4) of a first embodiment of a differential device according to the present invention, and FIG. 2 is another front sectional view of the differential device shown in FIG. 3 and 4), FIG. 3 is a side view from the C direction of the differential device of FIG. 1, and FIG. 4 is a side view from the D direction of the differential device of FIG. Let's start with.

The case 1 is composed of a case body 3 and a cover 5, and is rotated by driving an engine mounted on a vehicle (not shown). In the accommodation chamber 7 inside the case 1, the case 1
A first shaft 9 and a second shaft 1 which are concentric with the rotation axis of
1 is rotatably inserted, the cover 5 has a first shaft hole 13 into which the first shaft 9 is inserted, and the case body 3 has a second shaft 11 into which a second shaft 11 is inserted. Shaft hole 1
5 are formed respectively.

First shaft 9 inserted in case 1
The first side gear 17 and the second side gear 19 are respectively locked to the outer peripheral portion of the second shaft 11.

In the case body 3 and the cover 5, a pair of accommodating holes 21 and 23 respectively communicate with the cover 5 at four locations along the outer circumferences of the first shaft hole 13 and the second shaft hole 15. Locking projections 25 and 27 are formed on the outside of the accommodation holes 21 and 23 in the axial direction. The housing holes 21a and 23a provided in the cover 5 among the housing holes 21 and 23 have inner circumferential surfaces formed all around, and the housing holes 2 provided in the case body 3 are provided.
1b and 23b are formed with an opening 28 opened to the accommodation chamber 7 on the side of the rotating shaft.

In one of the pair of accommodation holes 21 and 23,
The first pinion gear 29 is accommodated in a floating state, and the second pinion gear 31 is accommodated in a floating state on the other side. The both pinion gears 29 and 31 are engaged with the engaging portions 25 and 2
Axial movement is prevented by 7.

A first gear portion 33 is formed at the end portion of the first pinion gear 29 on the cover 5 side, and a second gear portion 35 is formed at the end portion of the case body 3 side. Gear part 3
The third gear portion 35 and the third gear portion 35 are connected by an extension boss portion 37.

On the other hand, the second pinion gear 31 is formed with gear portions 39 and 41 as a whole, and the second pinion gear 31 is formed.
Is shorter than the first pinion gear 29.

The first gear portion 3 of the first pinion gear 29
3 and the one end side 39 of the second pinion gear 31 has the opening 2
Housing holes 21a, 23 of the cover 5 in which 8 is not formed
a, and is accommodated in the first gear portion 33 and the pinion gear 31.
The one end side 39 of the above is meshed with each other through the accommodation holes 21a and 23a.

The other end side 41 of the second gear portion 35 and the pinion gear 31 extends from the opening 28 of the case body 3 to the accommodation chamber 7.
Projecting inward, the second gear portion 35 is
The other end 41 of the pinion gear 31 meshes with the first side gear 17, respectively. In addition, the first and second pinion gears 29 and 31 are the first and second side gears 1.
Since there are a plurality of pairs on the circumference of 7, 19, the first and second side gears 17, 19 are supported in the radial direction by these.

The case 1 of the differential device thus constructed is held on the vehicle body side by a bearing (not shown). In the flange portion 4 of the case body 3,
A gear (not shown) is attached, and the rotational force of the engine is input to the gear via the power transmission device. The first and second shafts 9 and 11 are interlocked with the left and right axles of a vehicle (not shown).

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

Since the first side gear 17 and the second side gear 19 do not move relative to each other when the vehicle goes straight ahead, the first pinion gear 29 and the second pinion gear 31 also do not move relative to each other. That is, as shown in FIGS. 3 and 4, when the engine is driven, the case 1 is moved to the arrow X direction via the power transmission device.
The second pinion gear 31 receives the force in the X direction from the accommodation hole 23 of the case 1 and rotates in the first direction.
7 is transmitted to the first pinion gear 29,
The force in the X direction is received from the accommodation hole 21 and the force is transmitted to the second side gear 19. As a result, the first and second shafts 9 and 11 rotate.

When the vehicle turns, the first side gear 17 and the second side gear 19 try to rotate relative to each other. For example, as shown in FIGS. 3 and 4, the second side gear 19 is
If you try to move in the X direction faster than Case 1,
Of the pinion gear 29 rotates in the Y direction, and the second pinion gear 31 meshing with the first pinion gear 29 moves in the Z direction.
Rotate in each direction. Therefore, the first side gear 17 meshing with the second pinion gear 31 rotates in the opposite X direction with respect to the case 1. That is, since the second side gear 17 can rotate faster than the first side gear 17, the vehicle can easily turn.

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

However, the X of the receiving holes 21 and 23 of the case 1
Since the moving speed of the first and second pinion gears 29 and 31 is lower than the moving speed of the first and second pinion gears 29 and 31, the first pinion gear 29 and the second pinion gear 31
Generate friction between the housing holes 21 and 23, and rotate while pressing the tooth surfaces of the meshed gears against each other.

Therefore, the rotation of the second side gear 19 is limited, and the first side gear 17 rotates as a reaction force thereof. That is, a rotational force larger than the slipping tire by the reaction force is transmitted to the tire that is not slipping, and the traction force restarts the traveling and the one-wheel slip state can be released.

Further, the first pinion gear 29 and the second pinion gear 31 are accommodated in the receiving holes 21a, 23 in the cover 5.
Since the meshing is carried out by a, the meshing state of both pinion gears 29 and 31 can be accurately maintained, the durability and quietness of both pinion gears 29 and 31 can be improved, and the height of the case 1 in the rotation axis direction can be improved. Can be formed small, and the differential device can be made smaller and lighter.

Further, since the second pinion gear 31 can be formed shorter than the first pinion gear 29,
It is especially suitable for downsizing and weight reduction of differential devices.

Next, a second embodiment of the present invention will be described.

FIG. 5 is a front sectional view of a second embodiment of the differential device according to the present invention (E-E sectional view of FIGS. 7 and 8), and FIG. 6 is another front sectional view of the differential device of FIG. 5 ( 7 and 8), FIG. 7 is a side view from the G direction of the differential device of FIG. 5, and FIG. 8 is a side view from the H direction of the differential device of FIG. Let's start with. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The case 43 includes a case body 45 and a cover 4.
7, the first shaft 9 and the second shaft 11 are rotatably inserted into the housing chamber 49 in the case 43 through the first shaft hole 13 and the second shaft hole 15. First
The outer periphery of the shaft 9 and the second shaft 11 of the
The side gear 17 and the second side gear 19 are locked. The case main body 45 has a pair of accommodation holes 51, along the outer circumference of the first shaft hole 13 and the second shaft hole 15.
53 are formed in four places, and an opening 54 opened to the accommodation chamber 49 is formed on the rotation shaft side of the accommodation holes 51, 53.

Here, the cover 47 in this embodiment is
As shown in FIGS. 9, 10, and 11, a holding portion 59 is provided in a protruding manner, and the holding portion 59 has one end sides 51a, 53a of the accommodation holes 51, 53 when attached to the case body 45.
In conformity with, the one end sides 51a, 5 of the accommodation holes 51, 53
3a is provided with a groove 59a forming an inner peripheral surface over substantially the entire circumference. That is, as shown in FIG. 5 and FIG.
When the cover 47 is attached to the case body 45, the accommodation hole 5
Inner peripheral surfaces are formed on the one end sides 51a, 53a of 1, 53 over substantially the entire circumference.

The first pinion gear 29 and the second pinion gear 31 have the receiving holes 51, 53 as in the first embodiment.
The pinion gears 29 and 31 are accommodated in a floating state at the locking portions 55, which are provided outside the accommodation holes 51 and 53 in the axial direction.
Movement is blocked by 57.

A first gear portion 33 and a second gear portion 35 are formed in the first pinion gear 29, and both gear portions 3
3, 35 are connected by an extension boss portion 37.
The second pinion gear 31 is formed with gear portions 39 and 41 as a whole, and is formed shorter than the first pinion gear 29.

The first gear portion 3 of the first pinion gear 29
3 and one end side 39 of the second pinion gear 31 are one end side 51a of the accommodation holes 51, 53 in which the inner peripheral surface is formed substantially all around,
53a, the first gear portion 33 and the pinion gear 3
The one end side 39 of the No. 1 meshes with the accommodation holes 51a and 53a.

That is, in the first embodiment, FIG. 1 and FIG.
As shown in FIG. 5, the first pinion gear 29 and the second pinion gear 31 are meshed with each other in the cover 5, but in the present embodiment, as shown in FIGS.
9 and the second pinion gear 31 are meshed in the case body 45.

Further, the second gear portion 35 and the other end side 41 of the pinion gear 31 project into the accommodating chamber 49 from the opening portion 54 of the case body 45 as in the first embodiment, and the second gear portion Reference numeral 35 meshes with the second side gear 19, and the other end side 41 of the pinion gear 31 meshes with the first side gear 17.

According to the differential device constructed as described above, the rotation of the second side gear 19 is restricted when one wheel slips as in the first embodiment, and the first side gear 17 rotates as a reaction force thereof. Thus, the one-wheel slip state is released, and the size and weight of the device can be reduced.

Further, particularly in this embodiment, since the first pinion gear 29 and the second pinion gear 31 are meshed with each other in the housing holes 51a and 53a in the case body 45,
Both side gears 17, 19 and both pinion gears 29, 31,
Also, the meshing between the both pinion gears 29 and 31 is all performed in the case body 45, and as a result, torque is transmitted only through the case body 45. As a result, the load on the cover 47 is reduced, the durability of the device is improved, the meshed state of both pinion gears 29 and 31 is maintained more accurately, and the durability and quietness of both pinion gears 29 and 31 are improved. Also improves.

[0041]

As described above, according to the present invention, when the load applied to one of the side gears is reduced, the other side gear is made to output favorably, and a differential device capable of running through a rough road or the like is provided. It is possible to reliably support the pinion gear, reduce the size and weight of the entire apparatus, and improve the durability and quietness of the pinion gear.

[Brief description of drawings]

FIG. 1 is a front sectional view of a first embodiment of a differential device according to the present invention.

FIG. 2 is another front sectional view of the differential device of FIG.

FIG. 3 is a side view from the C direction of the differential device of FIG.

FIG. 4 is a side view of the differential device of FIG. 1 viewed from the D direction.

FIG. 5 is a front sectional view of a second embodiment of the differential device according to the present invention.

6 is another front cross-sectional view of the differential device of FIG.

7 is a side view from the G direction of the differential device of FIG.

8 is a side view from the H direction of the differential device of FIG.

9 is a cross-sectional view of the main part of the case (L-L cross-sectional view of FIG. 11)
Is.

FIG. 10 is a side view of the case of FIG. 9 viewed from the direction I.

FIG. 11 is a side view of the case of FIG. 9 taken in the J direction.

[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 21 accommodation hole 21a accommodation hole 21b accommodation hole 23 accommodation hole 23a accommodation hole 23b Housing hole 29 First pinion gear 31 Second pinion gear 33 First gear portion 35 Second gear portion 43 Case 51 Housing hole 51a Housing hole 53 Housing hole 53a Housing hole

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[Procedure amendment]

[Submission date] March 3, 1993

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Added

[Correction content]

[Figure 10]

[Procedure amendment 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 11

[Correction method] Added

[Correction content]

FIG. 11

Claims (1)

[Claims] 1. A case which is rotated by a driving force of an engine, a first shaft hole which is formed in a side wall of one end of the case and which inserts a first shaft, and a second shaft hole which is formed in a side wall of the other end of the case. A second shaft hole through which the shaft of the first shaft is inserted, a first side gear provided on the outer circumference of the first shaft and rotating with the first shaft in the case, and a second side gear provided on the outer circumference of the second shaft. A second side gear that rotates together with the second shaft in the case, and a first pinion that has a first gear portion formed at one end and a second gear portion that meshes with the second side gear at the other end. A gear, a second pinion gear that meshes with the first side gear and meshes with the first gear portion of the first pinion gear, and the first and second shafts communicate with each other in the side wall of the one end. Place a specified distance along the perimeter of the hole A first pinion gear and a second pinion gear that rotatably accommodate the second pinion gear, and the first pinion gear and the second pinion gear are meshed in the side wall of the one end. A differential device characterized in that