JPH09144843A - Pre-load type differential limiting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a miltiple disk clutch into a sub-assembly, and adjust a pre-load of a disc spring after installation by forming the tips of almost half the number of bolts in fastening bolts to fasten first and second differtential cases as extendedly arranged parts, and locking lug grooves of outer plates of the multiple disk clutch on these extendedly arranged parts. SOLUTION: As a fastening bolt 9 where extendedly arranged parts 9A are arranged on the tips of almost half the number of fastening bolts 10 every other piece in large number of fastening bolts 10 to fasten first and second differential cases 2A and 2B, lug grooves 7C of respective outer plates 7A of a multiple disk clutch 7 are locked on these extendedly arranged parts 9A. The outer plates 7A are engaged (in a view Z) with the fastening bolt 9 to integrally rotate with the differential cases so as to be freely movable only in the shaft direction, and are rotated together with a left differential case 1, and in an inner plate 7B of the multiple disk clutch 7, an inner peripheral part engages with a spline 55 on the shaft part outer periphery of a left side gear 5 so as to be freely movable only in the shaft direction, and it is rotated together with the left side gear 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple plate in a differential limiting device capable of suppressing an excessive differential action that occurs when one wheel is idling and transmitting drive torque to a wheel on the low speed rotation side. This facilitates assembly of the clutch and adjustment of pressurization.

[0002]

2. Description of the Related Art A limited slip differential type differential limiting device of this type capable of suppressing an excessive differential action that occurs when one wheel idles and transmitting a driving torque to a wheel on a low speed side. As such, various configurations have been conventionally proposed. As one example of those, a structure similar to that described in Japanese Utility Model Laid-Open No. 5-8093 by the applicant of the present invention will be described with reference to FIG. 3, in which the driving force from the engine is a drive not shown. A pair of axially divided left and right differential cases 21 and 22 which are transmitted to a pinion and a ring gear that meshes with the drive pinion and bevel teeth are integrally fixed to rotate the ring gear.
The right diff case 22 is further divided in the axial direction and has first and second right diff cases 22A and 22B. A differential device including a differential gear is housed in the right diff case 22, and a disc spring 28 and a multi-plate clutch 27 are housed at the joint between the left and right diff cases 21 and 22. The left and right diff cases 21 and 22 are fastened with fastening bolts 31, and the first and second right diff cases 22A and 22B are fastened with fastening bolts 30, respectively.

The differential device includes a pair of left and right side gears 25 and 26 which are axially supported by a pinion shaft 23 in the right diff case 22 and mesh with a plurality of pinion gears 24 arranged in the circumferential direction from both sides in the axial direction. Differential case 2
It has a multi-plate clutch 27 composed of a plurality of outer plates 27A and inner plates 27B, which are alternately arranged in the joining portion of Nos. 1 and 22, and the outer plate 27A has a lug 27D protruding from the outer peripheral portion. The lug hole (groove) 34 of the left differential case 21 is movably engaged only in the axial direction (see arrow Y in FIG. 3) and rotates together with the left differential case 21, and the inner plate 27B has an inner peripheral portion having a left side gear. The spline 25S on the outer periphery of the shaft portion of 25 is movably engaged only in the axial direction and rotates with the left side gear 25.

With the differential limiting device having such a structure,
During normal straight running, the pinion gear receives the predetermined driving force from the differential case 22 by the driving force from the engine, and the pinion gear uniformly transmits the driving force to the left and right side gears 25 and 26. Further, when the vehicle encounters a bad road such as a mud and tries to generate an excessive differential action due to one wheel slipping, torque corresponding to the road surface resistance of the wheel is transmitted to the high speed wheel side. However, when the driving resistance of the right wheel (not shown) is large, for example, the fastening force of the multi-plate clutch 27 by the pressure of the disc spring 28, that is, the left differential case 2
The differential action is limited between the gear 1 and the side gear 25, the driving force is transmitted to the low speed wheel side, and the escape performance on a rough road is improved. However, in the pressurization type differential limiting device that generates the differential limiting force in the multi-plate clutch by the pressurization of the disc spring 28 as described above, when the pressurization of the disc spring 28 needs to be increased. The number of disc springs is increased and the bending angle of the disc springs is increased. Therefore, the axial length of the disc spring accommodating portion is increased, which may cause a design disadvantage. Therefore, as shown in FIG. 3, the disc spring 28 is composed of an outer disc spring 28A having a large radius and an inner disc spring 28B housed in the outer disc spring 28A.
By arranging them in tandem with each other, a pressurization type differential limiting device has been proposed which does not increase the axial length of the disc spring accommodating portion even if a large number of disc springs are installed to increase the pressurization. is there.

[0005]

In such a differential limiting device, it is necessary to assemble a multi-plate clutch 27 composed of a plurality of outer plates 27A and inner plates 27B, which are alternately arranged, in a differential case. ,
In this type of differential limiting device in which the multi-plate clutch 27 is arranged in a joint portion of a differential case which is divided into two in the axial direction, in particular, each outer plate 27 in the multi-plate clutch is arranged.
The lug 27D on the outer peripheral portion of A is the lug hole 3 of the left differential case 21.
It is troublesome to assemble them by aligning them one by one with each other, and since each plate may pop out due to the existence of the disc spring 28, conventionally, in order to facilitate the assembly of the multi-plate clutch, there is a large number of plates in one differential case. It was also considered to interpose a snap ring or the like in order to subassemble the plate clutch. Further, it is necessary to engrave a lug hole (groove) for locking the outer plate 27A in the differential case on the inner peripheral portion of the differential case 21, which complicates the structure. However, even if the multi-plate clutch can be sub-assembled by such a conventional one, when the outer plate is aligned with the lug hole of the differential case and assembled, the lug hole is indented by the "sag" for alignment. It is necessary to pay close attention not to cause
It still took time to assemble it. Therefore, in the present invention, the above-mentioned conventional differential limiting device is further improved, a differential case having a simple structure can be adopted, and the multi-plate clutch can be surely and easily subassembled without requiring special care. (EN) Provided is a differential limiting device capable of adjusting the applied pressure of a disc spring after assembling.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a differential limiting device having a first and a second right diff case in which the right diff case in the left and right diff cases which are axially divided into two is further divided into two in the axial direction. In the differential limiting device, a differential device including a differential gear is housed in the right diff case, and a multi-disc clutch for differential limiting is housed together with a disc spring in a joint portion of the left and right diff cases. And the second
At least approximately half of the fastening bolts for fastening the right differential case are extended to form extended portions, and the extended portions are engaged with the lug grooves of each outer plate of the multi-plate clutch. This is a means for solving the problem. Further, according to the present invention, a screw portion is engraved at the tip of the extension portion of the fastening bolt, and the axial lengths of the disc spring and the multi-plate clutch can be adjusted by an adjusting nut screwed to the screw portion. Further, the present invention is characterized in that a wear resistant plate is disposed on the side surface of the multi-plate clutch or the disc spring which is in contact with the adjusting nut, and these are means for solving the problems.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first example of a pressurization type differential limiting device of the present invention.
1 is an overall sectional view showing an embodiment, in which a driving force from an engine rotates a pair of axially divided left and right differential cases 1 and 2 that integrally fix a ring gear (not shown). The right diff case 2 is further divided in the axial direction and has first and second right diff cases 2A and 2B. A differential device including a differential gear is housed in the right differential case 2. The differential device includes a pair of left and right side gears 5 and 6 which are axially supported by a pinion shaft 3 in a right diff case 2 and mesh with a plurality of pinion gears 4 arranged on the circumference from both sides in the axial direction. In the joint of the differential cases 1 and 2, a multi-plate clutch 7 composed of a plurality of outer plates 7A and inner plates 7B, which are alternately arranged, and a disc spring 8 are housed. The disc spring 8 is formed by arranging a plurality of disc-shaped disc springs 8A having a large radius and an inner-diameter side disc spring 8B housed in the disc-shaped outer spring 8A in a column so as to be superposed in the axial direction. Even if a large number of disc springs are installed to increase the pressure, the axial length of the disc spring accommodating portion does not increase.

The left and right diff cases 1 and 2 are arranged on the circumference by an appropriate number of fastening bolts 11, and the first and second right diff cases 2A and 2B are arranged on the circumference. It is fastened with about 12 fastening bolts 10, respectively. In the present embodiment, the tip end side is left from the fastening screwing portion of approximately half of the fastening bolts 10 of the fastening bolts 10 for fastening the first and second right differential cases 2A and 2B. A fastening bolt 9 is provided which extends into the lug hole or the lubrication hole 14 of the differential case 1 and has an extension portion 9A. The extension portion 9A is engaged with the lug groove 7C of each outer plate 7A of the multi-plate clutch 7. Then, the outer plate 7A is engaged with the fastening bolt 9 that rotates integrally with the differential case so as to be movable only in the axial direction (see the arrow Z in FIG. 1) so as to rotate together with the left differential case 1. The inner plate 7B of the clutch 7 has an inner peripheral portion movably engaged with a spline 5S on the outer peripheral portion of the shaft portion of the left side gear 5 so as to be movable only in the axial direction, so as to rotate together with the left side gear 5. The fastening bolts 9 are provided with the extending portions 9A only in some of the plurality of fastening bolts 10 that are evenly arranged on the circumference, and the number thereof is appropriately selected. In this case, three fastening bolts may be used which are equally spaced on the circumference and are equally divided into three parts. Of course, it does not prevent provision of the extension portion to all of the fastening bolts 10. Further, a screw portion 9B is engraved at the tip of the extending portion 9A of the fastening bolt 9, and the screw portion 9B is formed.
The axial lengths of the disc spring 8 and the multi-plate clutch 7 can be adjusted via a washer 13 by means of an adjusting nut 12 screwed into the. Note that reference numeral 16 indicates a rotation washer for the fastening bolt 9.

With such a structure, in order to assemble the pressurizing type differential limiting device of the present invention, the differential device including the differential gears such as the pinion gear 4, the pinion shaft 3, and the left and right side gears 5 and 6 is housed. Then, the first and second right differential cases 2A and 2B are fastened with fastening bolts 9 and 10, and then the disc spring 8 and the multi-plate clutch 7 are assembled to the outer peripheral portion of the left side gear 5. At that time, the inner peripheral portion of the inner plate 7B of the multi-plate clutch 7 is slid to the spline 5S on the outer peripheral portion of the shaft portion of the left side gear 5, but the spline 5S on the outer peripheral portion of the shaft portion of the left side gear 5.
Is exposed to the outside, the alignment can be performed quickly without the need for careful attention such as the “searching” work for alignment as in the conventional one, and the assembly is very reliable and It's easy. Also, the multi-plate clutch 7
Lug groove 7C in the outer peripheral portion of each outer plate 7A
Is to be slid onto the extended portion 9A of the fastening bolt 9, but the extended portion 9A of the fastening bolt 9 is also exposed to the outside, so that its assembly is extremely reliable and easy. Thus, the outer plate 7A and the inner plate 7B can be assembled alternately and reliably and easily. Further, according to the present invention, the outer plate 7A of the multi-plate clutch 7 can be rotated together with the differential cases 1 and 2 by the extending portion 9A of the fastening bolt 9 fastened and fixed to the differential case 2, so that the outer plate 7A is rotated. Since it is not necessary to install a lug or a lug groove for locking to the inner peripheral portion of the differential case, the structure of the differential case becomes extremely simple.

Next, the adjusting nut 12 is screwed into the screw portion 9B at the tip of the extending portion 9A of the fastening bolt 9 through the washer 13 so that the adjusting nut 12 contacts the outermost plate of the multi-plate clutch 7. Assemble This completes the sub-assembly of the multi-disc clutch 7 including the disc spring 8 for the right differential case 2. Finally, the left and right diff cases 1 and 2 are joined while aligning the lug hole or the lubrication hole 14 in the left diff case 1 so as to accommodate the adjustment nut 12 screwed into the extending portion 9A of the fastening bolt 9. The fastening is completed by the fastening bolt 11. If it is necessary to increase the pressurizing load of the disc spring 8 after assembling, tighten the adjustment nut 12 to reduce the axial length of the disc spring 8 via the multi-plate clutch 7. Can increase the pressurization. It is also possible to reverse the arrangement of the disc spring 8 and the multi-plate clutch 7.

FIG. 2 shows a second embodiment of the present invention. In the present embodiment, the wear resistant plate 15 is provided on the side surface of the multi-plate clutch 7 (or the disc spring 8 when the disc spring 8 is arranged axially outside) that is in contact with the adjusting nut 12 via the washer 13. It is arranged. As a result, the washer 13 and the multi-disc clutch 7 do not come into direct contact with each other, and the adjustment nut 12 is tightened to increase the pressurizing load of the disc spring 8, and a gap is generated between the multi-disc clutch and the differential case. However, the abrasion resistant plate serves as a member on the differential case side, which prevents local contact of the clutch plate and extends the life of the multi-plate clutch. In addition, in any of the above embodiments,
It is not necessary to install a lug groove for locking the outer plate to the differential case on the inner peripheral part of the differential case, only the lug hole and the lubrication hole for accommodating the bolt and the adjusting nut are necessary, so the differential case structure is extremely It will be simple.

Although the embodiments have been described above, the number of fastening bolts to be provided with the extending portion, the shapes of the left and right differential cases, the shape of the joint between the left and right differential cases, and the difference are within the scope of the gist of the present invention. The form of the dynamic gear, the form, arrangement form and number of the multi-plate clutch and the disc spring, the adjusting form of the adjusting nut, the form and material of the abrasion resistant plate and the like can be appropriately adopted.

[0013]

As described in detail above, according to the present invention, the differential device including the differential gear is housed and fastened to the first and second right differential cases by the fastening bolts.
After that, slide the lug grooves on the inner peripheral part of the inner plate of the multi-plate clutch and the outer peripheral part of the outer plate of the multi-plate clutch to the spline on the outer periphery of the shaft part of the left side gear and the extension part of the fastening bolt, which are exposed to the outside. Since it can be assembled with ease, it is possible to perform the alignment quickly without the need for careful attention such as the “searching” work for alignment unlike the conventional one, and the assembly is extremely reliable and easy. Becomes Further, according to the present invention, since the outer plate of the multi-plate clutch can be rotated together with the differential case by the extending portion of the fastening bolt fastened and fixed to the differential case, the lug or the lug groove for locking the outer plate to the differential case. The structure of the differential case is extremely simple because there is no need to install the differential case inside the differential case.

Further, a disc nut is assembled by screwing an adjusting nut to a screw portion at the tip of the extending portion of the fastening bolt via a washer or the like and assembling the adjusting nut so as to contact the outermost plate of the multi-plate clutch. The multi-disc clutch including can be easily sub-assembled to the right differential case. Then, the left and right diff cases are joined while the lug holes or the lubrication holes in the left diff case are aligned so as to accommodate the adjustment nut screwed into the extended portion of the fastening bolt, and the fastening is easily performed by the fastening bolts. Not only can it be completed, but if it becomes necessary to increase the pressurizing load of the disc spring after assembly, tighten the adjustment nut and set the axial length of the disc spring via the multi-disc clutch. Can be shortened to increase pressurization. If a wear-resistant plate is arranged on the side surface of the multi-disc clutch or disc spring, the washer or adjusting nut and the multi-disc clutch do not come into direct contact with each other, so that the pressurizing load of the disc spring is increased. Even if the adjustment nut is tightened to the left side and a gap is generated between the multi-plate clutch and the differential case, the abrasion resistant plate serves as a member on the differential case side, local contact of the clutch plate is prevented, and the life of the multi-plate clutch is extended.

[Brief description of the drawings]

FIG. 1 is an overall sectional view showing a first embodiment of a pressurization type differential limiting device of the present invention.

FIG. 2 is a sectional view of an essential part showing a second embodiment of a pressurization type differential limiting device of the present invention.

FIG. 3 is an overall sectional view of a conventional pressurization type differential limiting device.

[Explanation of symbols]

 1 Left diff case 2A 1st right diff case 2B 2nd right diff case 3 Pinion shaft 4 Pinion gear 5 Left side gear 6 Right side gear 7 Multi-plate clutch 7A Outer plate 7B Inner plate 7C Lug groove 8 Disc spring 9 Fastening bolt 9A Extension part 9B Screw part 10 Tightening Bolt 11 Tightening Bolt 12 Adjustment Nut 13 Washer 14 Lug Hole (Groove) 15 Abrasion Resistant Plate

Claims (3)

[Claims] 1. A differential limiting device in which a right diff case in left and right diff cases divided into two in the axial direction has first and second right diff cases further divided into two in the axial direction, and a differential limiting device is provided in the right diff case. A first and second right diff case are fastened to each other in a differential limiting device in which a differential device including a dynamic gear is accommodated, and a disc spring and a multi-plate clutch for limiting the differential are accommodated in a joint portion of left and right differential cases. A pressurization type differential limiting device characterized in that a tip of a fastening bolt is extended to form an extended portion, and a lug groove of each outer plate of the multi-plate clutch is locked to the extended portion. 2. A screw portion is engraved at the tip of the extending portion of the fastening bolt, and the axial lengths of the disc spring and the multi-plate clutch can be adjusted by an adjusting nut screwed to the screw portion. The pressurization type differential limiting device according to claim 1. 3. The pressurization type differential limiting device according to claim 2, wherein a wear resistant plate is disposed on a side surface of the multi-plate clutch or the disc spring which is in contact with the adjusting nut.