JPH0989075A - Differential limit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wearing or the like by forming a crossing groove, crossed with a sliding part of both clutch surfaces to comprise a plurality of fine grooves communication from the axial direction one end side with the other end side, over the total periphery in the circumferential direction in either one of the clutch surface in a side gear side in a cone clutch part or the clutch surface in a differential gear case side. SOLUTION: A pinion gear 7 is rotatably supported on a pinion shaft 3 integrally rotated with a differential gear case 1. This pinion gear 7 is meshed with a pair of side gears 9, a cone clutch part 11, tilting these side gears 9 between themselves and the differential gear case 1 in the internal diametric direction toward the axial direction outside, is provided. In either one of a clutch surface 13 on the side of the side gear 9 of this cone clutch part 11 or a clutch surface 15 on the side of the differential gear case 1, a crossing groove 21, mutually crossed with a sliding part of both the clutch surfaces 13, 15 to supply lubricating oil to comprise a plurality of fine grooves communicating from the axial direction one end side with the other end side, is formed over the total periphery in the circumferential direction. Accordingly, wearing, seizure, etc., can be prevented.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG.
Such a differential device 101 is described. This differential device 101 includes a differential case 1
Pinion shaft 105 fixed to approximately the center of 03
A pinion gear 107 rotatably supported by the pinion shaft 105, and a pair of side gears 109 meshing with the pinion gear 107 from both left and right sides.

A cone type clutch member 111 is splined to the outside of each side gear 109 in the axial direction.

On the outer circumference of the cone type clutch member 111,
A conical clutch surface 113 is formed which is inclined toward the inner diameter toward the outer side in the axial direction. On the other hand, on the inner peripheral surface of the differential case 103, the clutch surface 113 of the cone type clutch member 111 is formed.
A clutch surface 115 is formed that is in surface contact with and engages with.

Left and right axles (not shown) are connected to the left and right side gears 109 by spline engagement, respectively.

In such a differential device 101, when a driving resistance difference is generated between the left and right axles, that is, when the side gears 109 are differentially rotated, the cone type clutch is generated by the mesh thrust force between the side gears 109 and the pinion gears 107. The clutch surface 113 of the member 111 frictionally engages with the clutch surface 115 of the differential case 103, the differential rotation between the axles is limited, and torque is distributed to both axles as necessary.

[0007]

However, in the conventional differential device 101 as described above,
When the cone type clutch member 111 is fastened to the differential case 103, the clutch surface 113 and the clutch surface 115 are frictionally engaged all at once, which causes a problem that abnormal noise due to slip occurs.

An oil groove 117 for lubricating the sliding surfaces of the clutch surface 113 and the clutch surface 115 is formed on the outer peripheral surface of the cone type clutch member 111. The oil groove 117 is a spiral in the circumferential direction. Since the groove is formed in a single line, the lubricating oil supplied from the groove to the clutch surfaces 113 and 115 is insufficient, and the holding force of the lubricating oil on the clutch surfaces 113 and 115 becomes low, so that the clutch surfaces 113 and 115 There is a problem in that the differential limiting force becomes unstable due to wear, galling, seizure, etc. on 115. Such a problem was more prominent especially when the vehicle was inclined.

Therefore, an object of the present invention is to provide a differential limiting device which can prevent wear, galling, seizure, etc. with a simple structure and can obtain a stable differential limiting force.

[0010]

In order to solve the above-mentioned problems, a differential limiting device according to a first aspect of the present invention comprises a differential case which is interlockingly connected to a driving side and rotates, and a pinion shaft which integrally rotates with the differential case. A pinion gear rotatably supported on a pinion shaft, and a pair of side gears that mesh with the pinion gear are provided, and a cone clutch portion is provided between the side gear and the differential case, the cone clutch portion inclining toward the inner diameter toward the outer side in the axial direction. Supplying lubricating oil to the sliding parts of both clutch surfaces on at least one of the clutch surface on the side gear side and the clutch surface on the differential case side of the clutch portion, a plurality of intersecting axially communicating one end side to the other end side are provided. It is characterized in that intersecting grooves made of narrow grooves are formed over the entire circumference in the circumferential direction.

Therefore, when differential rotation occurs between the side gears, a frictional resistance force is generated between the side gear side clutch surface and the differential case side clutch surface of the cone clutch portion due to the mesh thrust force of the side gear and the pinion gear. Thus, the differential limiting force can be obtained.

Further, since a plurality of intersecting grooves are formed over the entire circumference in the circumferential direction on at least one of the clutch surface on the side gear side and the clutch surface on the differential case side, when the side gear and the differential case rotate differentially, Since sufficient lubricating oil is retained in the sliding part between the clutch surface on the side of the clutch and the clutch surface on the side of the differential case through the cross groove, wear, galling, seizure, etc. on both clutch surfaces are prevented, and differential limiting is performed. Power is stable.

Further, when the side gear and the differential case are differentially rotated, even if the side gear-side clutch surface and the differential case-side clutch surface are slidably engaged with each other, an abnormal noise such as a slip noise can be prevented.

A differential limiting device according to a second aspect is the differential limiting device according to the first aspect, characterized in that the intersecting groove is formed by knurling.

Therefore, as in the differential limiting device according to the first aspect, when the side gear and the differential case are differentially rotated, the sliding portion between the side gear side clutch surface and the differential case side clutch surface is formed by knurling. Since sufficient lubricating oil is retained through the cross groove, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

A differential limiting device according to a third aspect of the present invention is the differential limiting device according to the first or second aspect, in which a wide groove that communicates from one end side to the other end side in the axial direction is spirally formed in the cross groove. It is characterized in that it is formed into a shape.

Therefore, similarly to the differential limiting device according to the first aspect, when the side gear and the differential case are differentially rotated, the sliding portion between the side gear-side clutch surface and the differential case-side clutch surface is sufficiently provided through the cross groove. Since sufficient lubricating oil is retained, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since the wide groove is spirally formed in the intersecting groove, sufficient lubricating oil is supplied to the intersecting groove through this groove, so that the retaining force of the lubricating oil in the intersecting groove is increased. It becomes higher, and the effect of preventing wear, galling, and seizure on both clutch surfaces can be further enhanced.

A differential limiting device according to a fourth aspect is the differential limiting device according to the first or second aspect, in which the cross groove has a wide axial direction communicating from one end side in the axial direction to the other end side. It is characterized in that the grooves are formed at a plurality of positions at predetermined intervals in the circumferential direction.

Therefore, as in the differential limiting device according to the first aspect of the present invention, when the side gear and the differential case are differentially rotated, a sliding portion between the side gear side clutch surface and the differential case side clutch surface is sufficiently provided through the cross groove. Since sufficient lubricating oil is retained, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since a wide groove in the axial direction is formed in the intersecting groove at a plurality of positions at a specified interval in the circumferential direction, sufficient lubricating oil is supplied to the intersecting groove through each groove. Therefore, the retaining force of the lubricating oil in the intersecting groove is increased, and the effect of preventing wear, galling, seizure, etc. on both clutch surfaces can be further enhanced.

A differential limiting device according to a fifth aspect of the present invention is the differential limiting device according to the first or second aspect, in which the spiral wide width communicating from one end side in the axial direction to the other end side in the intersecting groove. It is characterized in that the groove and the axially wide groove communicating from one end side to the other end side in the axial direction are formed so as to intersect with each other.

Therefore, similarly to the differential limiting device according to the first aspect of the present invention, when the side gear and the differential case are differentially rotated, the sliding portion between the side gear side clutch surface and the differential case side clutch surface is sufficiently provided through the cross groove. Since sufficient lubricating oil is retained, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since the spiral wide groove and the axial wide groove are formed so as to intersect each other in the intersecting groove, sufficient lubricating oil is supplied to the intersecting groove through both grooves. Therefore, the holding power of the lubricating oil in the intersecting groove becomes high, and the intersecting portion of both grooves becomes an oil reservoir, which does not cause oil shortage, so wear and galling of both clutch surfaces,
The effect of preventing image sticking can be enhanced.

A differential limiting device according to a sixth aspect is the differential limiting device according to the first or second aspect, in which the narrow width in the axial direction communicating from one end side in the axial direction to the other end side in the cross groove. The grooves are formed at predetermined intervals in the circumferential direction.

Therefore, as in the differential limiting device according to the first aspect of the present invention, when the side gear and the differential case are differentially rotated, the sliding portion between the side gear side clutch surface and the differential case side clutch surface is sufficiently provided through the cross groove. Since sufficient lubricating oil is retained, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, in the intersecting groove, a plurality of axially narrow grooves communicating from one axial side to the other axial side are formed at predetermined intervals in the circumferential direction. The groove becomes an oil reservoir, and the oil will not run out even when the lubricating oil is not supplied due to the inclination of the vehicle or the like, so that the seizure prevention effect can be further enhanced.

The differential limiting device according to claim 7 is the differential limiting device according to claim 1 or 2, wherein a plurality of dimples are formed in the intersecting groove over the entire circumference. To do.

Therefore, similarly to the differential limiting device according to the first aspect, when the side gear and the differential case are differentially rotated, a sliding portion between the side gear side clutch surface and the differential case side clutch surface is sufficiently provided through the cross groove. Since sufficient lubricating oil is retained, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

Furthermore, since a plurality of dimples are formed in the intersecting groove over the entire circumference in the circumferential direction, these dimples serve as oil reservoirs, and the oil will run out even when the lubricating oil is not supplied due to the inclination of the vehicle. Since it does not occur, the effect of preventing seizure can be further enhanced.

A differential limiting device according to an eighth aspect of the present invention includes a differential case which is interlockingly connected to a drive side to rotate, a pinion shaft which rotates integrally with the differential case, a pinion gear which is rotatably supported by the pinion shaft, and a pinion gear. A cone clutch portion provided with a pair of side gears that mesh with each other, is provided between the side gear and the differential case, and is inclined toward an inner diameter toward an axially outer side, and a clutch surface on the side gear side of the cone clutch portion and a clutch on the differential case side. On either side of the surface, cross grooves that supply lubricating oil to the sliding parts of both clutch surfaces and that intersect with each other and communicate with each other from the one end side to the other end side in the axial direction are formed over the entire circumference in the circumferential direction. However, a wide axial groove communicating from one end side in the axial direction to the other end side in the other side is formed at a plurality of positions at predetermined intervals in the circumferential direction. To.

Therefore, during the differential rotation between the side gear and the differential case, sufficient lubricating oil is supplied through the wide groove in the axial direction formed on the other side, and this lubricating oil is crossed on the one side. Since it is held through the groove, it is possible to further enhance the effect of preventing wear, galling, seizure, etc. on both clutch surfaces.

The differential limiting device according to claim 9 is the differential limiting device according to claim 4 or 5 or 8, characterized in that the wide groove in the axial direction is formed in parallel with the axial direction. To do.

Therefore, as in the differential limiting device according to the fourth, fifth, or eighth aspect, sufficient lubricating oil is supplied to the intersecting groove through each groove, so that the retaining force of the lubricating oil in the intersecting groove becomes high. The effect of preventing wear, galling, and seizure on both clutch surfaces can be further enhanced.

A differential limiting device according to a tenth aspect is the differential limiting device according to the fourth, fifth or eighth aspect, in which the wide groove in the axial direction is inclined at a predetermined angle with respect to the axial direction. It is characterized by being formed.

Therefore, as in the differential limiting device according to the fourth, fifth, or eighth aspect, sufficient lubricating oil is supplied to the intersecting groove through each groove, so that the retaining force of the lubricating oil in the intersecting groove becomes high. The effect of preventing wear, galling, and seizure on both clutch surfaces can be further enhanced.

Further, since the groove is inclined at a predetermined angle with respect to the axial direction, the galling prevention effect on both clutch surfaces can be further enhanced.

The differential limiting device according to claim 11 is the differential limiting device according to claim 4, 5 or 8, wherein the wide groove in the axial direction is curved with a predetermined curvature in the axial direction. It is characterized by being formed.

Therefore, similarly to the differential limiting device according to the fourth, fifth or eighth aspect, sufficient lubricating oil is supplied to the intersecting groove through each groove, so that the retaining force of the lubricating oil in the intersecting groove becomes high. The effect of preventing wear, galling, and seizure on both clutch surfaces can be further enhanced.

Furthermore, since the groove is curved with a predetermined curvature in the axial direction, the galling prevention effect on both clutch surfaces can be further enhanced.

[0041]

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

FIG. 1 is a sectional view of a differential limiting device according to an embodiment of the present invention, and FIG. 2 is a side view taken along the arrow X in FIG. The left-right direction is the left-right direction in FIG. It should be noted that members to which reference numerals are not given are not shown.

The differential case 1 is rotatably supported by the differential carrier, and the ring gear linked to the drive pinion integral with the drive shaft on the drive side is fixed to the differential case 1 so that the ring gear and the differential case 1 are integrated. Rotate.

The differential case 1 comprises a case body 1a made of cast metal and a cover 1b, which are integrally fastened by bolts.

A pinion shaft 3 is arranged substantially in the center of the differential case 1, and the end of the pinion shaft 3 is fixed to the differential case 1 via a pin 5. A pair of pinion gears 7 are rotatably supported on the pinion shaft 5.

A pair of side gears 9 arranged coaxially with the differential case 1 are meshed with the pinion gear 7 from both left and right sides. The left and right axles are connected to each side gear 9 by spline engagement.

The outer diameter portion of each side gear 9 is provided with a cone portion (cone clutch portion) 11 formed so as to incline toward the inner diameter toward the outer side in the axial direction, and the outer peripheral surface of the cone portion 11 is provided. Is a first clutch surface (clutch surface on the side gear side) 13.

On the other hand, on the inner peripheral surface of the differential case 1, there is formed a second clutch surface (clutch surface on the differential case side) 15 which comes into surface contact with and engages with the first clutch surface 13 of the cone portion 11. There is. The side gear 9 is the cone portion 1
The first first clutch surface 13 is rotatably centered by the second clutch surface 15 of the differential case 1.

A rear surface 17 (a surface on the outer side in the radial direction) of the pinion gear 7 is slidably and rotatably held by a support portion 19 formed on the differential case 1. The sliding surface of the support portion 19 has a spherical shape and bears the meshing reaction force of the pinion gear 7 and the centrifugal force of the pinion gear 7 due to the meshing with the side gear 9.

The first clutch surface 13 of the cone portion 11
Is a cross groove 2 which supplies and holds lubricating oil to the sliding portion between the first clutch surface 13 and the second clutch surface 15.
1 is formed over the entire circumference. Cross groove 21
Are formed by a plurality of narrow grooves intersecting with each other and communicating from one end side to the other end side in the axial direction. The cross groove 21 is formed by knurling or the like.

Further, the first clutch surface 13 of the cone portion 11 has the first clutch surface 13 and the second clutch surface 1
Wide grooves 23 for supplying lubricating oil are formed at a plurality of positions at predetermined intervals in the circumferential direction on the sliding portion with respect to 5.

The groove 23 of this embodiment is formed so as to be inclined at a predetermined angle with respect to the axial direction and communicate from one end side to the other end side in the axial direction.

The cross groove and the wide groove are formed on the second clutch surface (the clutch surface on the side of the differential case) 1 of the differential case 1.
5, the first clutch surface 13 of the cone portion (cone clutch portion) 11 (side gear side clutch surface) 13 and the second clutch surface of the differential case 1 (differential case side clutch surface) 15 May be provided.

Further, the left side wall of the differential case 1 and the right corner portion are provided with a plurality of openings 25, 27 through which lubricating oil flows in and out, and a right corner portion where a part of the left and right side gears 9 is exposed. The opening 27 has an angle of α ° with respect to the center line of the differential case 1 so that the lubricating oil can easily flow in. In addition, the inner surface that slides with the side gear 9 has a structure shown in FIG.
R is formed as shown in FIG.

Next, the operation of this embodiment will be described.

When the differential case 1 is rotated by the rotation of the ring gear that is interlocked with the drive side, this rotation is transmitted to the left and right side gears 9 via the pinion shaft 3 and the pinion gear 7, and the left and right axles connected to the respective side gears 9 are transmitted. To rotate. At this time, if a driving resistance difference occurs between the left and right axles, the driving force is differentially distributed between the left and right axles due to the rotation of the pinion gear 7.

On the other hand, when a driving resistance difference is generated between the left and right axles, that is, when the side gears 9 are differentially rotated, meshing thrust force between the side gears 9 and the pinion gears 7 causes a cone portion (cone clutch portion). 1st of 11
The clutch surface (the clutch surface on the side gear side) 13 and the second clutch surface (the clutch surface on the differential case side) 15 of the differential case 1 are frictionally engaged with each other, and a differential limiting force is applied.

Due to this differential limiting force, the differential rotation between the left and right axles is limited, and torque is distributed to each axle as necessary.

Further, since the first clutch surface 13 is formed with the cross groove 21 formed of a plurality of narrow grooves intersecting with each other and communicating from one end side in the axial direction to the other end side, the side gear is formed. Since sufficient lubricating oil is retained in the sliding portion between the first clutch surface 13 and the second clutch surface 15 via the cross groove 21 during the differential rotation between the differential clutch 9 and the differential case 1, Wear of the second clutch surfaces 13, 15,
It prevents galling and seizure, and stabilizes the differential limiting force.

Further, even if the first clutch surface 13 and the second clutch surface 15 are slidably engaged with each other during the differential rotation between the side gear 9 and the differential case 1, generation of an abnormal noise such as a slip noise is prevented. it can.

Since the first clutch surface 13 is formed with a wide groove 23 which is inclined at a predetermined angle with respect to the axial direction and communicates from one end side to the other end side in the axial direction, the groove 2 is formed.
Since a sufficient amount of lubricating oil is supplied to the cross groove 21 via 3, the holding force of the lubricant in the cross groove 21 is increased, and wear, galling, seizure, etc. of the first and second clutch surfaces 13, 15 occur. It is possible to further enhance the effect of preventing. Also, the first
Since the sliding surface 22 of the clutch surface 13 is also formed to be slanted, the supporting length in the circumferential direction becomes long, the sliding surface 22 does not slide at the end, and the first and second clutch surfaces 13, 15
Abrasion, galling, and seizure are further prevented.

4 to 10 show examples of other grooves.

In the example of FIG. 4, the cross groove 21 provided on the first clutch surface of the cone portion 11 is formed by knurling.

Therefore, similar to the above-described embodiment, the cross groove 21 is formed in the sliding portion between the first clutch surface 13 and the second clutch surface 15 during the differential rotation between the side gear 9 and the differential case 1.
Since a sufficient amount of lubricating oil is retained through the gears, wear, galling, seizure, etc. on the first and second clutch surfaces 13, 15 are prevented, and the differential limiting force is stabilized.

In this example, since the cross groove 21 is formed by knurling, the cross groove 21 can be easily formed.

In the example shown in FIG. 5, a cross groove 21 is formed on the first clutch surface 13 of the cone portion 11, and a wide groove communicating from one end side to the other end side in the axial direction is formed in the cross groove 21. 31 is formed in a spiral shape.

Therefore, similar to the above-described embodiment, when the side gear 9 and the differential case 1 are differentially rotated, the cross groove 2 is formed in the sliding portion between the first clutch surface 13 and the second clutch surface 15.
Since sufficient lubricating oil is retained through 1,
Wear, galling, seizure, etc. of the second clutch surfaces 13, 15 are prevented, and the differential limiting force is stabilized.

Further, in this example, since the spiral wide groove 31 is formed in the intersecting groove 21, sufficient lubricating oil is supplied to the intersecting groove 21 through this groove 31, so that the intersecting groove 21 is crossed. The retaining force of the lubricating oil in the groove 21 becomes high, and the effect of preventing wear, galling, seizure, etc. of the first and second clutch surfaces 13, 15 can be further enhanced.

In the example shown in FIG. 6, a cross groove 21 is formed in the first clutch surface 13 of the cone portion 11, and an axial direction communicating from the one axial end to the other axial end is formed in the cross groove 21. The wide grooves 33 are formed at a plurality of positions in parallel with the axial direction and at predetermined intervals in the circumferential direction.

Therefore, as in the case of the above-described embodiment, when the side 9 and the differential case 1 are differentially rotated, the sliding groove between the first clutch surface 13 and the second clutch surface 15 is provided through the cross groove 21. Since sufficient lubricating oil is retained, the first and second
The clutch surfaces 13, 15 are prevented from wear, galling, seizure, etc., and the differential limiting force is stabilized.

Further, in this example, since the wide groove 33 in the axial direction is formed in the intersecting groove 21 in parallel with the axial direction at predetermined intervals in the circumferential direction, these grooves 33 are formed. Since a sufficient amount of lubricating oil is supplied to the intersecting groove 21 via the interlocking groove 21, the retaining force of the lubricating oil in the intersecting groove 21 is increased, and wear, galling, seizure, etc. of the first and second clutch surfaces 13, 15 occur. The prevention effect can be further enhanced.

In the example of FIG. 7, a cross groove 21 is formed on the first clutch surface 13 of the cone portion 11, and an axial direction communicating from the one axial end to the other axial end is formed in the cross groove 21. The wide groove 33 is curved at a predetermined curvature with respect to the axial direction and is formed at a plurality of positions at predetermined intervals in the circumferential direction.

Therefore, as in the case of the above-described embodiment, when the side gear 9 and the differential case 1 are differentially rotated, the cross groove 2 is formed in the sliding portion between the first clutch surface 13 and the second clutch surface 15.
Since sufficient lubricating oil is retained through 1,
Wear, galling, seizure, etc. of the second clutch surfaces 13, 15 are prevented, and the differential limiting force is stabilized.

Further, in this example, a wide groove 33 in the axial direction is curved in the intersecting groove 21 with a predetermined curvature in the axial direction and is formed at a plurality of positions at predetermined intervals in the circumferential direction. Since sufficient lubricating oil is supplied to the intersecting groove 21 through these grooves 35, the retaining force of the lubricating oil in the intersecting groove 21 is increased, and wear of the first and second clutch surfaces 13, 15 The effect of preventing galling and seizure can be further enhanced.

In the example of FIG. 8, a cross groove 21 is formed in the first clutch surface 13 of the cone portion 11, and a plurality of dimples 37 are formed in the cross groove 21 over the entire circumference in the circumferential direction. There is.

Therefore, similar to the above-described embodiment, when the side gear 9 and the differential case 1 are differentially rotated, the cross groove 2 is formed in the sliding portion between the first clutch surface 13 and the second clutch surface 15.
Since sufficient lubricating oil is retained through 1,
Wear, galling, seizure, etc. of the second clutch surfaces 13, 15 are prevented, and the differential limiting force is stabilized.

Further, in this example, since the dimples 37 at a plurality of positions are formed in the cross groove 21 over the entire circumference in the circumferential direction, these dimples 37 serve as oil reservoirs, and lubricating oil is not required due to the inclination of the vehicle or the like. Since oil will not run out even in such a case, the effect of preventing seizure can be further enhanced.

In the example of FIG. 9, a cross groove 21 is formed in the first clutch surface 13 of the cone portion 11, and the cross groove 21 has a spiral shape that communicates from one end side to the other end side in the axial direction. The wide groove 39 and the wide groove 41 in the axial direction are formed so as to intersect with each other.

Therefore, similar to the above-described embodiment, when the side gear 9 and the differential case 1 are differentially rotated, the cross groove 2 is formed in the sliding portion between the first clutch surface 13 and the second clutch surface 15.
Since sufficient lubricating oil is retained through 1,
Wear, galling, seizure, etc. of the second clutch surfaces 13, 15 are prevented, and the differential limiting force is stabilized.

Further, in this example, since the spiral wide groove 39 and the axial wide groove 41 are formed in the intersecting groove 21 so as to intersect with each other, both grooves 39, 41 are interposed. Since a sufficient amount of lubricating oil is supplied to the intersecting groove 21, the retaining force of the lubricating oil in the intersecting groove 21 is increased, and the intersecting portion 40 of both the grooves 39 and 41 becomes an oil reservoir to prevent oil shortage. Therefore, the first and second clutch surfaces 1
It is possible to further enhance the effect of preventing abrasion, galling, seizure, etc. of Nos.

In the example of FIG. 10, a cross groove 21 and a spiral groove 31 are formed on the first clutch surface 13 of the cone portion 11, and the cross groove 21 extends from one axial end to the other axial end. Narrow grooves 43 in the axial direction that communicate with each other are formed at a plurality of positions at predetermined intervals in the circumferential direction.

Therefore, similar to the above-described embodiment, when the side gear 9 and the differential case 1 are differentially rotated, the cross groove 2 is formed in the sliding portion between the first clutch surface 13 and the second clutch surface 15.
Since a sufficient amount of lubricating oil is retained via 1 and the spiral groove 31, abrasion, galling, seizure, etc. of the first and second clutch surfaces 13, 15 are prevented, and the differential limiting force is stabilized.

Further, in this example, the narrow grooves 43 in the axial direction are formed in the cross groove 21 at a plurality of positions at predetermined intervals in the circumferential direction. Even when the vehicle becomes an oil reservoir and the lubricating oil is not supplied due to the inclination of the vehicle or the like, the oil will not run out, so that the seizure prevention effect can be further enhanced.

It should be noted that a separate member may be provided integrally with the side gear and the differential case, and a cross groove or the like may be provided on the clutch surface of these separate members.

[0085]

As is apparent from the above description, in the differential limiting device according to the first aspect, when the differential rotation between the side gears occurs, the side gear of the cone clutch portion is generated by the mesh thrust force of the side gear and the pinion gear. The differential limiting force can be obtained by frictional resistance between the side clutch surface and the differential case side clutch surface.

Further, since the cross groove formed by a plurality of narrow grooves intersecting each other is formed over at least one of the side gear side clutch surface and the differential case side clutch surface over the entire circumference in the circumferential direction, the side gear and the differential case are formed. During differential rotation with, since sufficient lubricating oil is retained in the sliding part between the side gear side clutch surface and the differential case side clutch surface via the cross groove, wear, galling and seizure on both clutch surfaces Etc. are prevented and the differential limiting force becomes stable.

Also, when the side gear and the differential case are differentially rotated, even if the side gear-side clutch surface and the differential case-side clutch surface are slidably engaged, it is possible to prevent the generation of abnormal noise such as slip noise.

A differential limiting device according to a second aspect is the differential limiting device according to the first aspect, wherein the intersecting groove is formed by knurling.

Therefore, similarly to the differential limiting device according to the first aspect, wear, galling, seizure, etc. of both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since the intersecting groove is formed by knurling, the intersecting groove can be easily processed.

A differential limiting device according to a third aspect is the differential limiting device according to the first or second aspect, in which a wide groove that communicates from one end side to the other end side of the axial groove is spirally formed in the intersecting groove. are doing.

Therefore, similarly to the differential limiting device according to the first aspect, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since the wide groove is spirally formed in the intersecting groove, sufficient lubricating oil is supplied to the intersecting groove through the wide groove, so that the retaining force of the lubricating oil in the intersecting groove is large. And the effect of preventing wear, galling, seizure, etc. on both clutch surfaces can be further enhanced.

A differential limiting device according to a fourth aspect is the differential limiting device according to the first or second aspect, in which a wide groove in the axial direction that communicates from one end side in the axial direction to the other end side in the intersecting groove is circumferentially formed. It is formed in a plurality of places at predetermined intervals.

Therefore, similarly to the differential limiting device according to the first aspect, wear, galling, seizure, etc. of both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since a wide groove in the axial direction is formed at a plurality of positions in the circumferential direction in the intersecting groove, a sufficient amount of lubricating oil is supplied to the intersecting groove through these grooves, so that the intersecting groove can be formed. The holding power of the lubricating oil can be increased, and the effect of preventing wear, galling, seizure, etc. on both clutch surfaces can be further enhanced.

A differential limiting device according to a fifth aspect is the differential limiting device according to the first or second aspect, in which the spiral wide groove and the axial wide groove are formed to intersect each other in the intersecting groove. are doing.

Therefore, similarly to the differential limiting device according to the first aspect, wear, galling, seizure, etc. on both clutch surfaces are prevented, and the differential limiting force is stabilized.

Furthermore, since the spiral wide groove and the wide axial groove are formed in the intersecting groove so as to intersect with each other, sufficient lubricating oil is supplied to the intersecting groove through both grooves. Therefore, the holding power of the lubricating oil in the intersecting groove can be increased, and the intersecting portion of both grooves serves as an oil reservoir,
Since the oil will not run out, the effect of preventing wear, galling, and seizure on both clutch surfaces can be further enhanced.

A differential limiting device according to a sixth aspect is the differential limiting device according to the first or second aspect, in which a groove having a narrow width in the axial direction that communicates from one end side in the axial direction to the other end side is formed in the intersecting groove. It is formed at a plurality of positions with a predetermined interval in the direction.

Therefore, similarly to the differential limiting device according to the first aspect, wear, galling, seizure, etc. of both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since the narrow groove in the axial direction is formed at a plurality of positions in the circumferential direction in the intersecting groove, the narrow groove serves as an oil reservoir, and the lubricating oil is not supplied due to the inclination of the vehicle or the like. Even in such a case, the oil will not run out, and the seizure prevention effect can be further enhanced.

A differential limiting device according to a seventh aspect is the differential limiting device according to the first or second aspect, wherein a plurality of dimples are formed in the cross groove over the entire circumference in the circumferential direction.

Therefore, similarly to the differential limiting device according to the first aspect, wear, galling, seizure, etc. of both clutch surfaces are prevented, and the differential limiting force is stabilized.

Further, since a plurality of dimples are formed in the intersecting groove over the entire circumference in the circumferential direction, these dimples serve as oil reservoirs, and the oil will run out even when the lubricating oil is not supplied due to the inclination of the vehicle. Since it does not occur, the effect of preventing seizure can be further enhanced.

According to another aspect of the present invention, there is provided a differential limiting device in which a cross groove is formed over the entire circumference on either one of the side gear side clutch surface and the differential case side clutch surface, and a wide axial groove is formed on the other side. Since it is formed at multiple locations in the direction,
During differential rotation between the side gear and the differential case, sufficient lubricating oil is supplied through the wide axial groove formed on the other side, and this lubricating oil is retained through the cross groove formed on the one side. Therefore, wear and galling of both clutch surfaces,
The effect of preventing image sticking can be enhanced.

The differential limiting device according to claim 9 is the differential limiting device according to claim 4 or 5 or 8, wherein wide grooves in the axial direction are formed in parallel with each other in the axial direction.

Therefore, as in the differential limiting device according to claim 4, 5 or 8, sufficient lubricating oil is supplied to the intersecting groove through each groove, so that the retaining force of the lubricating oil in the intersecting groove is increased. Therefore, the effect of preventing wear, galling, and seizure on both clutch surfaces can be enhanced.

A differential limiting device according to a tenth aspect is the differential limiting device according to the fourth, fifth or eighth aspect, in which a groove having a wide width in the axial direction is inclined at a predetermined angle with respect to the axial direction. .

Therefore, similarly to the differential limiting device according to the fourth, fifth or eighth aspect, sufficient lubricating oil is supplied to the intersecting groove through each groove, so that the retaining force of the lubricating oil in the intersecting groove is increased. It is possible to enhance the effect of preventing wear, galling and seizure on both clutch surfaces.

Further, since the groove is inclined at a predetermined angle with respect to the axial direction, the effect of preventing galling on both clutch surfaces can be further enhanced.

The differential limiting device according to claim 11 is the differential limiting device according to claim 4, 5 or 8 wherein the wide groove in the axial direction is curved with a predetermined curvature in the axial direction.

Therefore, similarly to the differential limiting device according to the fourth, fifth or eighth aspect, sufficient lubricating oil is supplied to the intersecting groove through each groove, so that the retaining force of the lubricating oil in the intersecting groove is increased. The effect of preventing wear, galling, and seizure on both clutch surfaces can be further enhanced.

Further, since the groove is curved with a predetermined curvature in the axial direction, the effect of preventing galling on both clutch surfaces can be further enhanced.

[Brief description of drawings]

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

FIG. 2 is a side view taken along arrow X in FIG.

FIG. 3 is a sectional view taken along line JJ of FIG.

FIG. 4 is a side view of a lower half of a side gear showing another example of the cross groove.

FIG. 5 is a side view of a lower half of a side gear showing another example of the cross groove.

FIG. 6 is a side view of a lower half of a side gear showing another example of the cross groove.

FIG. 7 is a side view of a lower half of a side gear showing another example of the cross groove.

FIG. 8 is a side view of a lower half of a side gear showing another example of the cross groove.

FIG. 9 is a side view of a lower half of a side gear showing another example of the cross groove.

FIG. 10 is a side view of the lower half of the side gear showing another example of the cross groove.

FIG. 11 is a cross-sectional view of a differential device according to a conventional example.

[Explanation of symbols]

 1 Differential Case 3 Pinion Shaft 7 Pinion Gear 9 Side Gear 11 Cone Part (Cone Clutch Part) 13 First Clutch Surface (Clutch Surface on Side Gear Side) 15 Second Clutch Surface (Clutch Surface on Differential Case Side) 21 Crossing Grooves 23, 31, 33, 35, 39, 41 Wide groove 37 Dimple 43 Narrow groove

Claims (11)

[Claims] 1. A differential case, which is interlockingly connected to a drive side to rotate, a pinion shaft which rotates integrally with the differential case, a pinion gear which is rotatably supported by the pinion shaft, and a pair of side gears which mesh with the pinion gear. , A cone clutch portion inclined inward toward the inner side in the axial direction between the side gear and the differential case is provided, and at least one of the side gear side clutch surface and the differential case side clutch surface of the cone clutch portion is provided. A difference that is characterized in that intersecting grooves for supplying lubricating oil to the sliding portions of both clutch surfaces intersect each other and are made up of a plurality of narrow grooves communicating from one end side to the other end side in the axial direction over the entire circumference. Motion limiter. 2. The differential limiting device according to claim 1, wherein:
A differential limiting device characterized in that the intersecting groove is formed by knurling. 3. The differential limiting device according to claim 1, wherein a wide groove that communicates from one end side in the axial direction to the other end side is formed spirally in the intersecting groove. Differential limiting device. 4. The differential limiting device according to claim 1, wherein a wide axial groove that communicates from one axial end to the other axial end is provided in the intersecting groove at a predetermined interval in the circumferential direction. A differential limiting device characterized in that it is formed at a plurality of positions with a gap. 5. The differential limiting device according to claim 1, wherein a spiral wide groove communicating from the one end side in the axial direction to the other end side in the cross groove and the other end from the one end side in the axial direction. A differential limiting device characterized in that an axially wide groove communicating with an end side is formed to intersect with each other. 6. The differential limiting device according to claim 1 or 2, wherein a narrow groove in the axial direction that communicates from one end side in the axial direction to the other end side in the intersecting groove is defined in the circumferential direction. A differential limiting device characterized by being formed at intervals. 7. The differential limiting device according to claim 1 or 2, wherein a plurality of dimples are formed in the intersecting groove over the entire circumference in the circumferential direction. 8. A differential case, which is interlockingly connected to a drive side to rotate, a pinion shaft which rotates integrally with the differential case, a pinion gear which is rotatably supported by the pinion shaft, and a pair of side gears which mesh with the pinion gear. A cone clutch portion inclined between the side gear and the differential case toward the inner side toward the outer side in the axial direction,
Supplying lubricating oil to the sliding parts of both clutch surfaces on either one of the side gear side clutch surface and the differential case side clutch surface of the cone clutch part, intersecting each other and communicating from one end side to the other end side in the axial direction. A cross groove consisting of a plurality of narrow grooves is formed over the entire circumference in the circumferential direction, and a plurality of wide grooves in the axial direction which communicate from one end side in the axial direction to the other end side in the other side are provided at predetermined positions in the circumferential direction. A differential limiting device characterized by being formed in. 9. The differential limiting device according to claim 4, 5 or 8, wherein the wide groove in the axial direction is formed in parallel with the axial direction. 10. The differential limiting device according to claim 4, 5 or 8, wherein the wide groove in the axial direction is formed by inclining at a predetermined angle with respect to the axial direction. Motion limiter. 11. The differential limiting device according to claim 4, 5, or 8, wherein the wide groove in the axial direction is formed by being curved at a predetermined angle with respect to the axial direction. Motion limiter.