JPH08285045A - Differential gear - Google Patents

Abstract

PURPOSE: To restrain a differential gear from becoming large-sized so as to reduce weight and to suppress cost increase. CONSTITUTION: In a differential gear formed of a ring gear 25 receiving the driving force of an engine, a case 1, a pair of side gears 9, 11, a first and a second pinion gears 37, 39 and a first and a second storage holes 29, 31, a bolt 27 for fixing the ring gear 25 to the case 1 is positioned between the first pinion gear 37 and the second pinion gear 39 and between the respective pinion gear sets.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art There is a differential device disclosed in Japanese Patent Publication No. 61-51696.

In this differential device, a pair of side gears are rotatably arranged in a case, and an output shaft is spline-coupled to each side gear. Two pairs of storage holes are formed on the outer periphery of the side gear, and a first pinion gear that meshes with one of the side gears is stored in one of the storage holes so as to be slidably rotatable at the tip of the gear. A second pinion gear, which meshes with the other side gear, is accommodated in the other of the accommodation holes so as to be slidably rotatable at the tip of the gear. The first and second pinion gears mesh with each other at opposite ends.

On the outer periphery of the case, a flange portion to which a ring gear for receiving a driving force from the engine is attached is formed in a projecting manner, and a hole is provided in the flange portion to fix the ring gear with an attaching bolt.

According to such a differential device, when differential rotation occurs between the pair of side gears, the first
The second pinion gear rotates while sliding its tooth tip surface against the wall surface of the housing hole, and the differential rotation is limited by the frictional resistance of the sliding portion.

[0006]

However, in the differential device as described above, the bolt for attaching the ring gear to the flange portion projectingly formed on the outer circumference of the case is dependent on the magnitude of the driving force to be transmitted. Although the number and thickness of the bolts are taken into consideration, the bolts may be attached at any position as long as the ring gear does not interfere with the outer circumference of the case, and they are arranged without considering the shape of the entire device.

Further, when the differential device is manufactured in consideration of the magnitude of the driving force from the engine, the diameters of the side gear and the pinion gear must be formed as large as necessary.

Therefore, if the number and thickness of the side gear, the pinion gear, and the ring gear mounting bolt are set in consideration of the magnitude of the driving force from the engine, the differential device becomes large, and the weight and cost increase.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a differential device capable of suppressing the increase in size of the differential device, reducing the weight thereof, and suppressing the increase in cost.

[0010]

In order to solve the above-mentioned problems, a differential device according to a first aspect of the present invention is provided with a case in which a driving force of an engine is inputted from a ring gear to rotate, and a rotating shaft arranged in the case. A plurality of pinion gear sets each including a pair of side gears that are rotatably provided in the same manner, a first pinion gear that meshes with each other and one side gear, and a second pinion gear that meshes with the other side gear; A first storage hole for rotatably storing the first pinion gear,
The first storage hole, the first pinion gear, and the second pinion gear are opened at the portions where they mesh with each other, and the second storage hole that rotatably stores the second pinion gear is provided between the axles of the vehicle or between the axles to perform differential rotation. In the allowable differential device, a ring gear mounting bolt for fixing the ring gear to the case is located between the first pinion gear and the second pinion gear and between each pinion gear set.

A differential device according to a second aspect of the present invention is the differential device according to the first aspect, characterized in that the outer periphery of the case in which the ring gear mounting bolt is located has a concave shape.

A differential device according to a third aspect of the present invention is the differential device according to the first or second aspect, wherein the first pinion gear and the second pinion gear are the first accommodation hole and the second accommodation hole.
The case is characterized in that the portions that slide in the storage holes have approximately the same wall thickness.

[0013]

According to the differential device of the present invention, the ring gear mounting bolts for fixing the ring gear to the case are located between the first pinion gear and the second pinion gear and between the pinion gear sets. Since it is provided without interfering with the outer circumference of the case, it is possible to suppress an increase in the size of the differential device, reduce the weight of the device, and suppress an increase in cost.

According to a second aspect of the present invention, in the differential apparatus according to the first aspect, the outer periphery of the case in which the ring gear mounting bolt is located has a concave shape, so that the head of the ring gear mounting bolt is located on the outer periphery of the case. It is possible to more reliably suppress the size increase of the differential device without interfering with each other, and it is possible to suppress the weight reduction and the cost increase of the device.

According to a third aspect of the present invention, there is provided a differential apparatus according to the first aspect, wherein the first pinion gear and the second pinion gear are the first accommodation hole and the second accommodation hole.
By forming the case thickness of the part that slides in the storage hole to be approximately equal, it is possible to secure sufficient strength of the case and prevent the case from becoming thicker than necessary, and it is possible to suppress the size increase of the differential device. Weight reduction and cost increase are suppressed.

[0016]

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

FIG. 1 is a front cross-sectional view (cross-sectional view taken along the line BB of FIG. 2) of a differential device according to an embodiment of the present invention, and FIG. 2 shows a case 1 from the direction A of the differential device of FIG. It is a side view. The left and right directions are the vehicle in which this differential device is used and the left and right directions in FIG. In addition, members without reference numerals are not shown.

The case 1 is composed of a case body 3 and a cover 5, and is rotatably arranged in a diff carrier (not shown) via bearings by driving an engine mounted on the vehicle. A first side gear 9 and a second side gear 11 as a pair of side gears are rotatably arranged in the housing chamber 7 of the case 1 so as to be the same as the rotation shaft of the case 1. The first side gear 9 and the second side gear 11 are formed with bosses at their ends and are inserted into the shaft support holes of the case 1 to prevent them from falling.

The case body 3 has two side gears 9, 11
A pair of storage holes 29 and 31 are arranged at equal intervals along the outer periphery of the
The storage holes 29 and 31 are formed in one place, and the storage shaft 7 is opened to the storage chamber 7 on the rotary shaft side. Further, the storage holes 29, 31 are formed as opening portions 33 that are open in the side wall portion 35 of the case body 3 in the rotational direction, and have inner peripheral surfaces formed over substantially the entire circumference.

One of the pair of storage holes 29 and 31 is provided with
The first pinion gear 37 is slidably rotatably housed at the tip of the gear, and the second pinion gear 39 is slidably rotatably housed at the tip of the gear on the other side.

At the right end of the first pinion gear 37, there is a first
Is formed with a second gear portion 47 at the left end.
Is formed, and the first gear portion 45 and the second gear portion 47 have a connecting shaft portion 49 formed to have a smaller diameter than the gear portions 45, 47.
Are linked by.

Unlike the first pinion gear 37, the second pinion gear 39 is integrally formed with the first gear portion 51 and the second gear portion 51.
The gear portion 53 is formed, and the overall length is shorter than that of the first pinion gear 37.

The first gear portion 4 of the first pinion gear 37
5 and the first gear portion 51 of the second pinion gear 39,
The openings 33 in the side wall portion 35 mesh with each other.

The second gear portion 4 of the first pinion gear 37
7 and the second gear portion 53 of the second pinion gear 39,
The storage holes 29 and 31 project into the storage hole 7 at the portions open to the storage chamber 7 on the rotary shaft side, and the second gear portion 47 of the first pinion gear 37 serves as the first side gear 9 and the second pinion gear. The second gear portion 53 of 39 is the second side gear 11
Are engaged with each other.

The first pinion gear 37 and the second pinion gear 39 meshing with each other form one set of pinion gears, and the pinion gear set is composed of the side gears 9 and 11.
A plurality of pairs on the circumference of the circle (in this embodiment, four pairs at equal intervals)
It is provided.

First side gear 9 and second side gear 1
A thrust washer 57 is arranged at the inner end in the axial direction with respect to 1, and a mating boss 59 is formed so as to support and center each other. The centering of the first side gear 9 and the second side gear 11 as a whole is performed by the plurality of first and second pinion gears 37, 39.
It is done by meshing with.

A convex portion 13 is formed at the right end of the side wall portion 35 of the case body 3, and screw holes 73 (four places in the embodiment) are formed in the convex portion 13. A screw member 75 is screwed into the screw hole 73 to fix the disc-shaped plate member 71 to the case body 3, and the first and second pinion gears 3
7 and 39 are positioned to the right in the axial direction.

A thrust washer 77 is disposed between the case body 3 and the cover 5, and the first pinion gear 37 is axially positioned to the left in the axial direction by means of the thrust washer 7.
7 through the cover 5 and the second pinion gear 39
The left side wall portion 79 of the case main body 3 is used to position the left side in the axial direction.

Flange portions 15 and 17 are formed on the case main body 3 and the cover 5, respectively, and are integrated by screws 21 for temporary assembly (in this embodiment, two locations on a diagonal line).

Bolt holes 23 (in this embodiment, 8 at equal intervals in the present embodiment) are formed in the flange portions 15 and 17, respectively.
Location) is provided. The bolt hole 23 is formed between the first pinion gear 37 and the second pinion gear 39, and between the adjacent pinion gear sets. A bottom face 24 is provided on the right surface of the flange portion 15.

A ring gear 25 for receiving a driving force from the engine is arranged on the left side of the flange portion 17, and the ring gear 25 is fixed to the case 1 by a ring gear mounting bolt 27 penetrating the bolt holes 23 of the flange portions 15 and 17. . The bolt 27 is the flange 15 and the bolt 27.
The end portion 28a of the washer 28, which is disposed between the two and which is engaged with the adjacent bolts 27, is bent to prevent rotation.

On the outer periphery of the case body 3, a recess 83 is provided between the first pinion gear 37 and the second pinion gear 39,
A recess 81 is formed between adjacent pinion gear sets. The recesses 81 and 83 allow the ring gear mounting bolt 27 not to interfere with the outer circumference of the case body 3. In addition, the case wall thickness 1 between the outer periphery of the case body 3 and the storage holes 29, 31 and between the adjacent pinion gear sets.
a, 1b and 1c are formed to be substantially equal.

A lubricating oil passage for introducing lubricating oil into the case 1 is provided in the case body 3 as an outer periphery of the case body 3 and a storage hole 29.
The communicating radial lubricating oil passage 63 is formed as a recess 14 between the convex portions 13 of the case body 3, and when the plate member 71 is attached, the recess 14 serves as a lubricating oil passage 67 and serves as the pinion gear 37 of the cover 5. , 39 is formed with a lubricating oil passage 65. The lubricating oil flowing in through these lubricating oil passages 63, 65, 67 lubricates the gear parts and sliding parts of the side gears 9, 11 and the pinion gears 37, 39.

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

When the vehicle goes straight, the first side gear 9 and the second side gear 11 do not make a differential motion, so that the first pinion gear 37 and the second pinion gear 39 also do not make a differential motion.

When the vehicle is turning, the first side gear 9 and the second side gear 11 try to rotate differentially. For example, when the first side gear 9 rotates faster than the other, the side gears 9 and 11 and the pinion gears 37 and 39 are separated from each other. It becomes easier for the vehicle to turn by rotating each.

When one wheel slips, for example, when the coefficient of friction between the tire on the side of the second side gear 11 and the road surface is smaller than that of the tire on the side of the first side gear 9, the second side gear 11 is larger than the case 1. I try to rotate faster,
The pinion gears 37, 39 are pressed against the storage holes 29, 31 in accordance with the magnitude of the input torque from the engine to the case 1, and when the pinion gears 37, 39 rotate, the tooth tips form the storage holes 29, 31. Sliding with friction occurs between them to generate an action of stopping the rotation of the pinion gears 37, 39. As a result, the side gear 9,
The differential rotation of 11 is also limited, and the driving force can be transmitted to the tire side that is not slipping.

[0038]

As is apparent from the above description, according to the first aspect of the invention, the bolt for fixing the ring gear to the case is provided between the first pinion gear and the second pinion gear and between each pinion gear set. Since the bolt is provided without interfering with the outer circumference of the case by arranging at the position, it is possible to suppress the increase in size of the differential device, and reduce the weight and the increase in cost.

According to the invention described in claim 2, claim 1
In the differential device described in (1), the outer circumference of the case where the bolt is located has a concave shape, so that the head of the bolt does not interfere with the outer circumference of the case, and it is possible to more reliably suppress the increase in the size of the differential device and reduce the weight. And the increase in cost is suppressed.

According to the invention of claim 3, claim 1
In the differential device described in (1), the first pinion gear and the second pinion gear are formed to have substantially equal case wall thicknesses in a portion where the first pinion gear and the second pinion gear slide in the first storage hole and the second storage hole, thereby sufficiently securing the strength of the case. As a result, the case can be prevented from becoming thicker than necessary, the differential device can be prevented from increasing in size, and the weight reduction and the cost increase can be suppressed.

[Brief description of drawings]

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

FIG. 2 is a side view of the differential device of FIG. 1 as viewed from the direction A.

[Explanation of symbols]

 1 Case 9 First Side Gear 11 Second Side Gear 25 Ring Gear 27 Bolt 29 Storage Hole 31 Storage Hole 37 First Pinion Gear 39 Second Pinion Gear 81, 81 Recess

Claims (3)

[Claims] 1. A case that rotates by inputting a driving force of an engine from a ring gear, and a pair of side gears that are rotatably provided in the case and have a rotation shaft that is the same as that of the case. A plurality of pinion gear sets including a first pinion gear that meshes with the side gear and a second pinion gear that meshes with the other side gear, a first storage hole formed in the case for rotatably storing the first pinion gear, and a first storage hole. A differential device provided between the axles of the vehicle or between the wheels and having a second storage hole that opens at a portion where the first pinion gear and the second pinion gear mesh with each other and rotatably stores the second pinion gear, and that allows differential rotation. First, attach the ring gear mounting bolt for fixing the ring gear to the case in
A differential device characterized by being positioned between a pinion gear and a second pinion gear and between each pinion gear set. 2. The differential device according to claim 1, wherein an outer periphery of the case in which the ring gear mounting bolt is located has a concave shape. 3. The differential device according to claim 1, wherein a case wall thickness of a portion where the first pinion gear and the second pinion gear slide in the first storage hole and the second storage hole are formed to be substantially equal to each other. Differential device.