JPH07243507A - Differential device - Google Patents

Abstract

PURPOSE:To prevent a pinion from tumbling and improve the easiness in the work of installing the device. CONSTITUTION:A differential device 7 includes a casing body 33 and a cover 31 and is equipped with a differential case 21 rotationally driven by the driving force of engine, a pinion 57 accommodated in a hole in the casing body 33 slidably and rotatably, a pair of wheel-side side gears 37, 39 coupled through the pinion, and a supporting member 67 which supports one end of the pinion and is supported at an opening provided in the casing body 33.

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 in a vehicle.

[0002]

2. Description of the Related Art U.S.P. S. Patent 5244440
The differential device 201 as shown in FIG. This is a pair of helical side gears 2 connected to helical pinion gears 205 and 207 housed in a housing hole provided in the differential case 203 via these.
09 and 211. Differential device 2
The differential rotation of 01 is limited by the frictional resistance generated between the pinion gears 205 and 207 by the meshing reaction force with respect to the side gears 209 and 211 and the housing hole, and the frictional resistance generated by the meshing thrust force of the helical gear. In the differential device having the torque-sensitive differential limiting function that changes according to the transmission torque as described above, the differential limiting force cannot be obtained when one of the driving wheels is derailed and torque transmission is not performed. Therefore, there is a differential device in which a rotation difference sensitive coupling device having a speed sensitive differential limiting function is incorporated.

[0003]

However, in the above-described differential device, a certain amount of clearance is required between the pinion gear and the housing hole, and therefore the pinion gear is not firmly supported, and therefore meshes with the side gear. There is a risk of falling due to a large reaction force and causing abnormal friction with the wall surface of the storage hole. Further, since the pinion gear is not positioned in the differential case as described above, the pinion gear is likely to drop at the time of assembling, and the assembling work is further troublesome especially in the case of a complicated structure incorporating the rotation difference sensitive type coupling device.

Therefore, the present invention is to provide a differential device in which side gears are connected through a pinion gear housed in a housing hole of a differential case, and the pinion gear is prevented from falling and the assembling property is improved. And

[0005]

A differential device according to a first aspect of the present invention comprises a casing body and a cover fixed to each other, and is slidable between a differential case which is rotationally driven by a driving force of an engine and a housing hole of the casing body. A differential device comprising: a stored pinion gear, a pair of wheel-side side gears connected via the pinion gear, and a support member that supports one end of the pinion gear and is fixed to the opening side of the casing body. Is characterized by.

A differential device according to a second aspect of the present invention is provided with a rotation difference sensitive type coupling device which is disposed on the opening side of the casing main body with respect to the pinion gear, and one side and the other side of which are connected to the side gears via connecting portions. It is the differential device according to claim 1.

[0007]

The pinion gear has one end supported by the support member and is positioned on the casing main body through the support member, so that the pinion gear is prevented from falling and the pinion gear and the support member are assembled first. As a result, the work of assembling the side gear and the rotation difference sensitive coupling device becomes easy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the first invention will be described with reference to FIGS. 1, 4 and 5. FIG. 1 shows this embodiment, and FIG. 5 shows a power system of a vehicle using the embodiment. The left and right directions are the left and right directions in this vehicle and FIG. Further, members and the like not given reference numerals are not shown.

As shown in FIG. 5, this power system includes an engine 1, a transmission 3, a propeller shaft 5, a rear differential 7 (a differential device of FIG. 1 arranged on the rear wheel side), rear axles 9, 11, and left and right wheels. The rear wheels 13 and 15 and the left and right front wheels 17 and 19 are configured.

The differential case 21 of the rear differential 7 is arranged in the differential carrier 23. A ring gear 25 is fixed to the differential case 21, and the ring gear 25 meshes with a drive pinion gear 27. The drive pinion gear 27 is formed integrally with a drive pinion shaft 29 connected to the propeller shaft 5 side. In this way, the driving force of the engine 1 rotationally drives the differential case 21 from the transmission 3 via the propeller shaft 5. The differential carrier 23 is filled with oil to form an oil sump.

As shown in FIG. 1, the differential case 21 has a cover 3
1 and the casing body 33 are fixed by bolts 35. Helical side gears 37, 39 are arranged in the differential case 21, and each helical side gear 3
7 and 39 are rotatably supported by the cover 31 and the shaft support parts 41 and 43 of the casing body 33, respectively, and the free ends thereof are supported by the shaft support part 45 formed between them, and are centered. .

Inside the helical side gears 37 and 39, a thrust block 47 is arranged which abuts the axles 9 and 11, respectively. Helical side gears 37, 39
A washer 49 is disposed between the differential side and the helical side gears 37, 39 and the washer 51,
53 are arranged respectively.

The casing main body 33 is provided with four sets of long storage holes 55 and short storage holes 56 in the circumferential direction, and a long helical pinion gear 57 is slidably and rotatably stored in the long storage hole 55 for short storage. A short helical pinion gear 58 is slidably and rotatably housed in the hole. The long helical pinion gear 57 is formed with a shaft portion 59, a first gear portion 61, a connecting shaft portion 63, and a second gear portion 65 from the left, and the second gear portion 65 is the right helical side gear 39.
Is meshing with. The left end side of the short helical pinion gear 58 meshes with the first gear portion 61, and the right end side meshes with the left helical side gear 37. A shaft portion 60 is integrally formed on the left end side of the short helical pinion gear.

A support member 67 shown in FIG. 4 has an outer periphery at the opening of the casing body 33, and has a large-diameter hole 32 in the casing body.
It is press-fitted into and fixed. The support member 67 has a shaft support 69 for supporting the shaft 59 of the long helical pinion gear 57.
And a shaft support 71 for supporting the shaft of the short helical pinion gear. The inner diameter of the support member 67 is set to be larger than the outer diameter of the helical side gears 37, 39 so that they can pass therethrough.

The casing 21 is provided with openings 73 and 75 to allow the oil in the oil reservoir to flow into and out of the differential case 21.
Lubricate each sliding part inside.

The driving force of the engine 1 for rotating the differential case 21 is distributed from the respective helical pinion gears to the left and right rear wheels 13 and 15 via the helical side gears 37 and 39, and when a driving resistance difference occurs between the rear wheels, the pinion gears rotate. Thus, the driving force of the engine 1 is differentially distributed to the left and right sides.

While the torque is being transmitted, the tooth tops of the helical pinion gears are pressed against the wall surfaces of the accommodating holes and the shaft support portions 69, 71 of the support member 67 by the meshing reaction force with the helical side gears 37, 39. Frictional resistance occurs.
Further, the helical side gears 37, 39 are pressed against each other via the washer 49 by the meshing thrust force with the helical pinion gear during forward movement of the vehicle to generate frictional resistance.
A torque sensitive differential limiting force is obtained by these frictional resistances.

The rear differential 7 is thus constructed.
In the vehicle of FIG. 5 using the rear differential 7, straight running stability is improved by a large torque-sensitive differential limiting force generated in the rear differential 5 at the time of starting or accelerating when a large torque is applied to the rear wheels 13 and 15. Further, when turning without applying a large torque, a smooth and stable turning can be performed by an appropriate differential limiting force.

As described above, since one end of each helical pinion gear is supported by the support member 67, the helical side gears 37, 39 are prevented from falling due to the meshing reaction force, and the differential limiting torque rises faster. Abnormal wear due to uneven contact with the wall surface of the storage hole is prevented. Further, since the pinion gear can be supported only by the differential case 33 without circumferentially supporting the differential cases 31, 33, the machining cost can be reduced without complicating the shape of the differential case 31.

The rear differential 7 is assembled by the casing body 3
After fixing the support member 67 to the casing body 33 while assembling each helical pinion gear in the accommodation hole with the opening of 3 facing upward, the helical side gear 37,
39, thrust block 47, etc. assembled, cover 31
Install. In this way, at the time of assembling, each helical pinion gear is inserted through the supporting member 67 into the casing main body 3
Since it is fixed to 3, the subsequent assembling work becomes easy.

Next, a second embodiment of the first invention will be described with reference to FIGS. 2 shows this embodiment, and the differential device of this embodiment is used as the rear differential 77 of the vehicle shown in FIG. In this embodiment, members having the same functions as those in the first embodiment are designated by the same reference numerals. The left and right directions are the left and right directions in FIG.

In the casing body 33, four sets of storage holes 79 and other storage holes are formed in the circumferential direction. The helical pinion gear 81 is slidably and rotatably stored in the storage holes 79, and the other storage holes are provided in the other storage holes. The other helical pinion gear is housed so that it can slide and rotate. The helicopter pinion gear 81 includes a shaft portion 83, a first gear portion 85, and a connecting shaft portion 87 from the left.
And a second gear portion 89 are formed, and the left end side of the second gear portion 89 meshes with the right helical side gear 39. In addition, the other helical pinion gears have shafts from the left,
A first gear portion, a connecting shaft portion, and a second gear portion are formed. The left end side of the first gear portion meshes with the first gear portion 85, and the right end side thereof forms the left helical side gear 37. I'm in mesh. Further, the second gear portion meshes with the right end side of the second gear portion 89 of the helical pinion gear 81.

A support member 67 of FIG. 4 is press-fitted into the opening of the casing body 33, and the shaft support portions 69 and 71 support the shaft portion 83 of the helical pinion gear 81 and the shaft portion of another helical pinion gear. There is.

In the rear differential 77, the helical pinion gears are meshed with each other at both ends and are supported by the support member 67 at each shaft portion on the left end side, so that the falling is prevented and the differential limiting torque rises quickly. In addition, abnormal wear due to uneven contact with the wall surface of the storage hole is prevented. Further, since each helical pinion gear is fixed to the casing body 33 by the support member 67, the work of assembling the rear differential 77 becomes easy.

Next, an embodiment of the second invention will be described with reference to FIGS. 3, 4 and 5. FIG. 3 shows this embodiment, and the differential device of this embodiment is used as the rear differential 91 of the vehicle of FIG. In the following description, members having the same functions as those in the first embodiment of the first invention are designated by the same reference numerals. The left and right directions are the left and right directions in the vehicle of FIG. 5 and FIG.

Helical side gears 93 and 95 are arranged in the differential case 21. Also, the casing body 33
The helical pinion gear 99 is slidably and rotatably accommodated in the accommodating hole 97, and the other helical pinion gear is slidably and rotatably accommodated in the other accommodating hole. From the left, the helical pinion gear 99 includes a shaft portion 101, a first gear portion 103,
The connecting shaft portion 105 and the second gear portion 107 are formed, and the first gear portion 103 is the left helical side gear 93.
Is meshing with. The left end side of the other helical pinion gear meshes with the right helical side gear 95, and the right end side meshes with the second gear portion 107. A shaft portion is integrally formed on the left end side of the other helical side gear.

A support member 67 shown in FIG. 4 is press-fitted into the opening side of the casing main body 33, and the shaft support portions 69 and 71 support the shaft portion 101 of the helical pinion gear 99 and the shaft portions of other helical pinion gears. There is.

A rotation difference sensitive coupling device 109 is arranged on the left side of each helical pinion gear. The rotation difference sensitive coupling device 109 includes seal rings 117 and 117 that prevent oil from leaking from a pressure chamber 115 formed between the housing 111 and the hub 113. The seal rings 117 and 117 are provided between the hub 113 and the fitting portion 121 and the helical side gear 93. It is arranged between the connecting portion 125.

The housing 111 is formed integrally with the fitting portion 121, and is also integrated with the left helical side gear 93 via the connecting portion 123.
Is spline-fitted to the left rear axle 9. Hub 11
3 is integrally formed with a connecting portion 125 passing between the fitting portion 121 and the connecting portion 123, and the connecting portion 125 is spline-connected with the right helical side gear 95.
The right helical side gear 95 is spline-fitted to the right rear axle 11 via the fitting portion 127. Thus
The left helical side gear 93 is connected to the left rear wheel 13 side, and the right helical side gear 95 is connected to the right rear wheel 15 side.

A washer 129 is arranged between the helical side gears 93 and 95, and the housing 111 and the cover 3 are provided.
A washer 131 is disposed between the washer 131 and 1. The differential case 21 is provided with openings 133, 135, 137,
The oil in the oil reservoir flows in and out to lubricate the inside.

The driving force of the engine 1 for rotating the differential case 21 is distributed from the helical pinion gears to the left and right rear wheels 13 and 15 via the helical side gears 93 and 95, and when a difference in driving resistance occurs between the rear wheels, the helical side gears. The driving force of the engine 1 is differentially distributed to the left and right sides by the rotation of the.

The rotation-difference sensitive coupling device 10 is generated by the mesh thrust force received by the left helical side gear 93.
Since the housing 111 of 9 and the support member 67 slide, the torque sensitive differential limiting force is strengthened to that extent. In addition to this differential limiting force, since the rotation difference sensitive coupling device 109 is arranged between the helical side gears 93 and 95 as described above, as the rotation speed increases, the rotation difference sensitive coupling device Depending on the characteristics, it changes according to the differential rotation speed between the rear wheels.

Thus, the rear differential 91 is constructed. The vehicle of FIG. 5 using the rear differential 91 is added to the stability at the time of acceleration, and even if one of the rear wheels 13 and 15 runs idle on a bad road or the like, the rotation difference sensitive coupling device 109 drives the other rear wheel. Power is sent to improve running performance.

Since each helical side gear has one end supported by the support member 67 and is prevented from falling, the differential limiting torque rises quickly and abnormal wear of the sliding portion is prevented.

In each of the above embodiments, the support member 6
7 has been described as being fixed by being press-fitted into the large-diameter hole portion 32 of the casing body 33, but it may be fixed by a screw or the like in addition to the press-fitting, and the support member 67 can be used without fixing the supporting member 67. It is also possible to set the centering support in the large-diameter hole portion 32.

The rear differential 91 is assembled by fixing the support member 67 to the casing body 33 while assembling the helical pinion gears into the respective accommodation holes with the opening of the casing body 33 facing downward, and then the helical side gears 93, 9 are attached.
5 and the rotation difference sensitive coupling device 109 are assembled,
Attach the cover 31. When assembling in this way,
Since each helical pinion gear is first fixed to the casing body 33, subsequent assembling work becomes easy.

[0037]

According to the differential device of the present invention, since one end of the pinion gear housed in the housing hole of the casing body is supported by the support member supported on the opening side of the casing body, the pinion gear is prevented from collapsing and the differential gear is held. The limit torque rises quickly, and abnormal wear of the sliding part is prevented. Further, in assembling, the pinion gear is first assembled through the supporting member, so that the assembling work of other members becomes easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the first invention.

FIG. 2 is a sectional view of a second embodiment of the first invention.

FIG. 3 is a sectional view of an embodiment of the second invention.

FIG. 4 is a perspective view of a support member used in each example.

FIG. 5 is a skeleton mechanism diagram showing a power system of a vehicle using each embodiment.

FIG. 6 is a perspective view of a conventional example.

[Explanation of symbols]

 7, 77, 91 Rear differential (differential device) 21 Differential case 31 Cover 33 Casing body 37, 39, 93, 95 Side gear 55, 79, 97 Storage hole 57, 81, 99 Pinion gear 67 Support member 109 Rotational differential type coupling device 123 , 125 connection

Claims (2)

[Claims] 1. A differential case, which comprises a casing body and a cover fixed to each other and is rotationally driven by a driving force of an engine, a pinion gear slidably accommodated in an accommodating hole of the casing body, and a pinion gear connected to each other. A differential device comprising: a pair of wheel side gears; and a support member that supports one end of the pinion gear and that is supported on the opening side of the casing body. 2. A rotation-difference-sensitive coupling device, which is arranged on the opening side of the casing main body with respect to the pinion gear, and one side and the other side of which are connected to side gears via connecting portions, respectively. The differential device described.