JP2003254415A - Clutch type limited slip differential - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch type limited slip differential preventing the seizure of a clutch surely. <P>SOLUTION: This clutch type limited slip differential is provided with: a clutch 3 which is installed between the outer circumference of a back shaft 1a of a side gear 1 and the inner circumference of a differential cover 2 and transmits power between the back shaft 1a of the side gear 1 and the differential cover 2 by connecting interruptably; a baffle 9 in a differential case 5 which distinguishes a first oil sump domain S1 in the differential case 5 in which a drive gear 10 of a differential is immersed under the oil surface from other second oil sump domain S2 in the differential case 5, obstructs and permits the oil flow between the first oil sump domain S1 and the second oil sump domain S2; a bearing cage 8 at the end of the differential case 5 which supports a drive shaft 7 and the differential cover 2 rotatably through a bearing 6; a first communication passage R1 communicated with the outer circumference of the back shaft 1a of a side gear 1 from an atmosphere release part mounted on the bearing cage 8; and a second communication passage R2 communicated with atmosphere from the inner circumference of the differential cover 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch type limited slip differential.

[0002]

2. Description of the Related Art Limited Slip Differential
Differential) is mounted on a wheeled vehicle and is known as LSD, differential limiting device, non-slip differential, or the like. Generally speaking, it is a normal differential (Differen
The tial has a function of equalizing the torques of the left and right wheels (hereinafter referred to as “tires”), thereby allowing a difference in rotational speed between the left and right tires. On the other hand, the limited slip differential does not allow the rotational speed difference between the left and right tires when the torque evenly distributed to the left and right side gears is less than the respective tire slip limit torques, but for torques above the tire slip limit, It allows the tire to slip (for example, when turning). As such a limited slip differential, a torque sensitive type, a rotation sensitive type, an external control type and the like are known. As the torque sensitive type, a clutch type, a gear friction type, a cam lock type and the like are known. The present invention, which will be described in detail later, relates to a clutch type, and particularly to the lubrication structure thereof. FIG. 8 shows an example of a conventional clutch type lubrication structure. However, since details will be described later, only the comparison part with the embodiment of the present application, the details of which will be described later, will be described below.

The differential gear is lubricated by oil splashing. Therefore, the clutch is wet. Here, the disc and the plate that form the clutch slide on each other when the tire slips. Therefore, it is necessary to prevent seizure of the clutch, where the clutch is oil lubricated (so-called "oil lubrication").

Specifically, the case of FIG. 8 is referred to, and the cases of FIGS. 4, 6 and 7 are borrowed and described. As shown in FIG. 8, a clutch 3 is installed between the outer periphery of the rear shaft 1a of the side gear 1 and the inner periphery of the differential cover 2, and the clutch 3 is intermittently connected to connect between the rear shaft 1a of the side gear 1 and the differential cover 2. Power is transmitted. The differential cover 2 has a large diameter hole 2a, and the plate 3a can be seen through from the large diameter hole 2a.
On the back of this plate 3a is a disc 3b, and
Plates 3a and disks 3b are alternately arranged on the back surface thereof, such as plates 3a. The plate 3a is provided with a plurality of protrusions 3aa on the outer periphery as illustrated in FIG. 6, and these protrusions 3aa are slidably fitted in the left and right longitudinal grooves (not shown) on the inner periphery of the differential cover 2. On the other hand, the disc 3b is provided with a plurality of inner teeth 3bb on the inner circumference thereof as illustrated in FIG. 7, and these inner teeth 3bb are slidably fitted in the left and right longitudinal splines on the outer circumference of the left and right side gears 1. The rear surface of the rear shaft 1a of the side gear 1 has a thrust washer 4 illustrated in FIG.
(A so-called "thrust bearing") slidably contacts. The back surface of the thrust washer 4 is non-rotatably attached to the differential cover 2 via the protrusion 4a (see FIG. 3) on the outer periphery. The dashed-dotted line L in FIG. 8 indicates the lubricating oil surface. still,
The oil level L naturally differs wholly and partly when the vehicle is stopped, when traveling, on the bank road or on the uneven road.

That is, when the vehicle is running, the differential cover 2 is rotating. Therefore, when the large-diameter hole 2a is located below the oil surface L, the outer surface of the plate 3a that abuts the large-diameter hole 2a contacts the oil, and the contacted oil forms the plate 3a of the clutch 3 and the disc 3b along the surface of the plate 3a. And between the rear surface of the rear shaft 1a of the side gear 1 and the contact surface of the thrust washer 4. Here, the rear shaft 1 of the side gear 1 by oil
Lubrication and cooling occur on the contact surface between the rear surface of a and the thrust washer 4. By the way, in particular, the oil flowing between the plate 3a and the disc 3b has a centrifugal force generated due to the rotation of the differential cover 2, and the centrifugal force causes the centrifugal force toward the inner circumference of the differential cover 2 to cause the plate 3a and the disc 3b to rotate.
And lubricate and cool them to prevent seizure of the clutch 3.

[0006]

However, in the conventional clutch type limited slip differential having such a lubricating structure, when the vehicle is running, the differential cover provided with the gear rotates, so that the oil level is in the differential case. It is pressed against the inner wall of the oil and the oil level becomes lower,
Further, since the large diameter hole 2a is located away from the rotation axis of the clutch 3, it is difficult for oil for lubrication to reach the side close to the rotation center of the clutch 3, so that sufficient lubrication cannot be performed.
The following problems may occur. The seizure of the clutch is usually caused by dust in the oil, insufficient oil amount, etc., not to mention distortion and poor quality of the plate and disk. In particular, for construction machines such as wheel loaders and off-road dump trucks, because of the nature of the work, in order to operate in places where the road surface condition is bad,
Nukarumi starts and runs a lot, and its starting torque and driving torque are also large. For this reason, tire slip often occurs when the torque exceeds the tire slip limit, and therefore, the clutch slips inevitably. Further, in such a construction machine or the like, the vehicle speed is slow (that is, the rotation speed of the differential cover 2 is slow), and many round trips are made within a predetermined short distance where there are many curves. Occurs frequently. That is, in such a construction machine or the like, not only the clutch slips frequently but also the slip time is long and the transfer torque is large (that is, frictional heat is easily generated). Therefore, in such a construction machine or the like, there is a particular concern that the clutch 3 is insufficiently lubricated, and a few signs of such seizure of the clutch 3 are observed. The signs are more prominent in the anti-drive gear side clutch 3 than in the drive gear side clutch 3. That is, the conventional clutch-type limited slip diff having a lubrication structure is insufficient as a device used in such construction machines as a wheel loader and an off-road dump truck because of poor lubrication. There is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and an object thereof is to provide a clutch type limited slip differential which can more reliably prevent seizure of the clutch.

[0008]

In order to achieve the above object, a clutch type limited slip differential according to the present invention is installed between an outer circumference of a rear shaft of a side gear and an inner circumference of a diff cover, A clutch that connects intermittently to transmit power between the rear shaft of the side gear and the differential cover, and the first oil sump area in the differential case where the drive gear of the differential submerges below the oil level, and the second oil reservoir in the differential case. A baffle in the differential case, which distinguishes it from the sump region and allows the oil flow between the first and second oil sump regions while allowing it, and a drive shaft and a diff cover are rotatably supported by bearings respectively. The bearing cage at the end, the first communication passage communicating from the atmosphere opening portion provided in the bearing cage to the outer circumference of the rear shaft of the side gear, and the inner circumference of the differential cover to the atmosphere. And a second communication passage.

According to the above construction, the rotation of the drive gear scrapes a large amount of oil in the first oil sump region, but the baffle suppresses the oil flow from the second oil sump region to the first oil sump region. Therefore, the decrease in the oil level in the second oil sump region is suppressed. Then, the amount of oil increases from the second oil sump region scraped up by the unevenness of the outer surface of the rotating differential case. Therefore, the amount of oil flowing into the atmosphere opening portion provided in the bearing cage on the second oil sump region side (that is, the anti-drive gear side clutch side) also increases. The oil that has flowed into the atmosphere opening portion is discharged to the atmosphere through the first communication passage, the clutch, and the second communication passage and falls into the first and second oil storage areas, while the first and second oil storage areas are released. Directly discharged into the area. That is, according to the first configuration, the drive gear side clutch is the original one,
It is possible to more reliably prevent seizure of the clutch on the side opposite to the drive gear.

In the above structure, the following may be performed. (1) The atmosphere opening portion provided in the bearing cage may be an internal clearance of the bearing in the bearing cage. This is the first example as an atmosphere opening unit. Therefore, the function and effect are similar to those of the first configuration. (2) It is more preferable that the atmosphere opening portion provided in the bearing cage is a downward hole provided in the upper half of the bearing cage. This is the second example as an atmosphere opening unit. Therefore, the function and effect are also the same as those of the first configuration.
However, there is a degree of freedom in arranging the oil introduction port, which is a downward hole, at the most suitable position, and a certain amount of oil for preventing clutch seizure can be secured by that degree. Therefore, in the second example, clutch seizure prevention can be achieved more reliably than in the first example. (3) It is preferable that the first communication passage has a portion that gradually inclines toward the outer side as at least the outer side of the inner wall of the first communication channel moves toward the outer periphery of the rear surface shaft of the side gear. The wall forming the first passage is necessarily formed by using the inside of the differential and the outer circumference of the drive shaft. Since these rotate, a centrifugal force is generated in the oil in the first communication passage by this rotation. On the other hand, the oil around the drive shaft also rotates around the drive shaft due to its viscosity, and a centrifugal force is generated. Here, since the first communication passage has a portion that gradually inclines toward the outer side as at least the outside of the inner wall of the first communication passage moves toward the outer periphery of the rear shaft of the side gear, the oil in the first communication passage has oil in the rear shaft of the side gear. It is immediately supplied to the outer circumference. Therefore, clutch seizure can be prevented more reliably. (4) It is desirable that a passage be formed in the outer peripheral portion of the rear shaft of the side gear and that this passage be a part of the first communication passage. Any one of a plate and a disk forming a clutch meshes with the outer peripheral portion of the rear shaft of the side gear. However, this meshing tends to hinder the oil flow. On the other hand, since the passage is formed in the outer peripheral portion of the rear shaft of the side gear as a part of the first communication passage, the oil flow is less likely to be obstructed. Therefore, the oil can be smoothly supplied between the plate and the disc. This structure has a remarkable effect of preventing clutch seizure when the plate and the disk are multiple plates. (5) It is desirable that a groove communicating with a passage formed on the outer peripheral surface of the rear shaft of the side gear be formed on the rear surface of the rear shaft of the side gear. As described above, in the differential, the rear shaft of the side gear contacts the thrust washer 4. Therefore, by providing the groove, a sufficient amount of oil for the clutch can be circulated to the contact surface of the thrust washer 4, and thus the lubricity on the contact surface can be improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to FIGS. It should be noted that, in addition to including many examples, in order to facilitate the comparative explanation, FIG. 1 is constructed based on the conventional lubricating structure example of FIG. 8 described above, and both comparison parts are circled ( P1 to P5 in FIG. 1 and P01 to P05 in FIG. 8). Therefore, see also FIG. 8 for comparison.

Many of the elements of the limited slip differential illustrated in FIG. 1 are the same as those already described in the prior art with reference to FIG. 8. In summary, the rear shaft 1a of the side gear 1 is A clutch 3 is installed between the outer circumference and the inner circumference of the differential cover 2, and the clutch 3 is discontinuously connected to transmit power between the rear shaft 1a of the side gear 1 and the differential cover 2. The differential cover 2 has a large diameter hole 2a, and a part of the surface of the plate 3a can be seen through from the large diameter hole 2a. The discs 3b and the plates 3a are alternately and sequentially arranged from the back surface of the plate 3a.
As shown in FIG. 6, the plate 3a is provided with a plurality of protrusions 3aa on the outer periphery, and these protrusions 3aa are slidably fitted in the left and right longitudinal grooves (not shown) on the inner periphery of the differential cover 2. As shown in FIG. 7, the disc 3b has inner teeth 3 on its inner circumference.
a plurality of bb, and these internal teeth 3bb are the longitudinal splines 1aa in the left-right direction on the outer periphery of the rear shaft 1a of the side gear 1 (see FIG. 2).
(C), see FIG. 5), and is slidable. The rear surface of the rear shaft 1a of the side gear 1 slidably contacts a thrust washer 4 (so-called "thrust bearing") shown in FIG. Thrust washer 4
Is attached to the differential cover 2 via a projection 4a on the outer periphery (see FIG. 4) so as not to rotate. The dashed-dotted line L in FIG. 1 indicates the lubricating oil surface. Note that the oil level L naturally and wholly differs partially when the vehicle is stopped, when the vehicle is running, or on the bank road or the uneven road, as described above. However, in the following explanation,
For convenience, these are ignored unless otherwise noted.
Although not described, bearing cages 6 are internally provided at both ends of the differential case 5, and bearing cages 8 for rotatably supporting the left and right drive shafts 7 and the differential covers 2 are fixedly mounted through the bearings 6. (It is the same in FIG. 8).

In the limited slip diff having such a structure, the features of the first embodiment are: (1) The baffle 9 is provided in the differential case 5 (comparison P1 and P01). More specifically, the first oil sump region S1 in the differential case 5 in which the drive gear 10 of the differential dipped below the oil surface is distinguished from the other second oil sump region S2 in the differential case 5 and is in contact with the diff. To prevent the rotation of the differential from being obstructed, the bolt 5 is attached to the protrusion 5a cast on the bottom of the differential case 5.
The baffle plate 9 is raised by tightening b. still,
The baffle is a type that allows the oil flow while hindering the oil flow. Box type, plate type (single plate type, multiple plate type),
Innumerable types and mounting types such as perforated type and labyrinth type are prepared. The baffle in this embodiment is a single-plate perforated type, and although not shown, the baffle plate 9 is provided with many punch holes to prevent the oil flow between the first and second oil sump regions S1 and S2. While allowing oil flow. (2) Secondly, the first communication passage R1 is provided which communicates with the outer circumference of the rear surface shaft 1a of the side gear 1 from the internal clearance of the bearing 6 in the bearing cage 8 (comparison P2 and P02).
The internal gap corresponds to the “atmosphere opening portion” described in the claims. That is, the bearing 6 is lubricated with oil.
Specifically, the bearing 6 is provided with a gap (the above-mentioned "internal gap") between rolling elements such as balls and rollers between the outer race and the inner race, and since the gap is filled with oil, it is lubricated with oil. It Therefore, the oil that has passed through the first communication passage R1 from the internal clearance reaches the outer periphery of the rear surface shaft 1a of the side gear 1. (3) Third, the differential cover 2 is provided with a second communication passage R2 that communicates with the atmosphere through the opening R2A from the inner periphery thereof (comparison P3 and P03).

According to the first embodiment described above, the following operational effects are produced.

When the differential cover 2 rotates, the differential cover 2
The drive gear 10 fixed to the outer surface also rotates, but the drive gear tooth surface 10a and the protrusions such as the bolt 2b are the first,
The oil in the second oil sump regions S1 and S2 is scraped up,
The first and second heads L1 and L2 (not shown, the same applies hereinafter) of the oil reservoir regions S1 and S2 are lowered. Most of the oil that has been scraped off bounces or is transmitted by the inner wall of the differential case 5 and the like, and falls into the first and second oil sump regions S1 and S2.

By the way, the drive gear 10 is arranged from the first oil sump region S1 to immediately above it. Therefore, the drive gear tooth surface 10a scoops up the oil in the first oil sump region S1 much more than the amount of oil scooped up from the second oil sump region S2 by the protrusions such as the bolts 2b on the outer surface of the differential cover 2. Therefore, the head L2 on the side opposite to the drive gear (corresponding to the second oil sump region S2) is gradually lowered in the case of the conventional technique in which the baffle plate 9 is not provided, but according to the first embodiment, the baffle plate 9 is provided. Therefore, it is difficult for the oil in the second oil sump region S2 (corresponding to the opposite drive gear side) to flow into the first oil sump region S1 (corresponding to the drive gear side), and therefore, the second head L2 becomes the first head L1. Will be significantly higher than. In other words, the second head L2 is the baffle plate 9
It is higher than the water head L2 on the side opposite to the drive gear (corresponding to the second oil sump region S2) of the related art in which the above is not provided. On the other hand, the first head L1 is lower than the head L1 on the drive gear side (corresponding to the first oil sump region S1) of the related art in which the baffle plate 9 is not provided. That is, according to the first embodiment described above, the drive gear tooth surface 10a does not scoop up the oil in the first oil sump region S1 as much as in the prior art in which the baffle plate 9 is not provided. The lowering of the second head L2 is also suppressed, and the amount of oil lifted up in the second oil sump region S2 by the protrusions such as the bolts 2b on the outer surface of the differential cover 2 is increased. Therefore, in the case of the conventional technique, there is a concern that the amount of lubricating oil to the bearing 6 may be intermittent, for example, at the time of a curve or bank traveling. However, according to the first embodiment, as described above, the second hydraulic head is used. L2 is the conventional head L
Since it is higher than 2, no interruption of the amount of lubricating oil to the bearing 6 occurs. That is, according to the first embodiment, on the drive gear side, the first head L1 is low, but the drive gear tooth surface 1
Since the amount of oil lifted up from the first oil sump region S1 by 0a is large, the clutch 3, thrust washer 4 and bearing 6 on the drive gear side can be properly lubricated. On the other hand, on the anti-drive gear side, since the second hydraulic head L2 is also high, the amount of oil lifted up from the second oil sump region S2 by the protrusions such as the bolts 2b on the outer surface of the differential cover 2 increases. The clutch 3, the thrust washer 4, and the bearing 6 can be properly lubricated.

More specifically, the amount of lubricating oil flowing from the large diameter hole 2a of the differential cover 2 to the contact surface between the plate 3a of the clutch 3 and the disc 3b and the rear surface of the side gear 1 and the thrust washer 4 is ensured by the conventional technique. Can be more suitably performed. Further, the intermittentness of the amount of lubricating oil to the bearing 6 can be eliminated. The above effects occur both on the drive gear side and the counter drive gear side, but are more prominent on the counter drive gear side as compared with the prior art.

In addition, according to the first embodiment, there is provided the first communication passage R1 which communicates from the inner clearance of the bearing 6 in the bearing cage 8 to the outer periphery of the rear shaft 1a of the side gear 1 (comparison P2 and P02). ). That is, since the second hydraulic head L2 is high, the amount of lubricating oil to the bearing 6 is not intermittent, and the oil to the bearing 6 that is not intermittent is passed through the first communication passage R1 and the outer circumference of the rear shaft 1a of the side gear 1 Leading to.
All the oil that reaches here is reliably discharged into the atmosphere in the differential case from between the plate 3a and the disc 3b through the second communication passage R2 on the inner periphery of the differential cover 2 due to the centrifugal force generated by the rotation of the clutch 3. To be done. Therefore, the seizure of the clutch 3 is surely prevented. That is, according to the above-described first embodiment, the drive gear side clutch 3 is not the original, and the anti-drive gear side clutch 3 can also prevent seizure.

Other embodiments will be listed below together with their operation and effects.

(1) In the above-described first embodiment, the atmosphere opening portion provided in the bearing cage 8 is the internal clearance of the bearing 6 in the bearing cage 8. However, the downward hole 8a provided in the upper half of the bearing cage 8 may also be used. I do not care. FIG. 1 specifically illustrates this downward hole 8a (comparative P
4 ・ P04).

The effects are as follows. The density of the oil scraped up above the oil level L is determined by the baffle plate 9
In the case of the conventional technology in which the above is not provided, it is thick in the sky above the drive gear (corresponding to the sky above the first oil sump region S1) and thin in the sky above the drive gear side (corresponding to the sky above the second oil sump region S2).
On the other hand, in the first embodiment, as described above, the amount of oil lifted up in the first oil sump region S1 is suppressed and the amount of oil lifted up in the second oil sump region S2 is increased. Therefore, as compared with the related art, the thickness is thin above the first oil sump region S1 and the thickness is thick above the second oil sump region S2 side. Therefore, the oil scraped up above the first and second oil sump regions S2 flows into the left and right downward holes 8a and is filled therewith. Downward hole 8a
The oil that has filled up with the oil reaches the outer periphery of the rear surface shaft 1a of the side gear 1 from the hole bottom through the first communication passage R1. After that, as in the first embodiment, a centrifugal force is generated based on the rotation of the clutch 3, and the differential cover 2 is moved from between the plate 3a and the disc 3b.
It is reliably discharged into the atmosphere in the differential case through the second communication passage R2 on the inner periphery of. Therefore, the seizure of the clutch 3 is surely prevented. That is, according to this embodiment, it is possible to prevent the drive gear side clutch 3 from the original state and the anti-drive gear side clutch 3 from seizing as well.

In this embodiment, as shown in FIG. 1, a downward hole 8a is provided in the upper half of the bearing cage 8 in the structure of the first embodiment, which is a characteristic structure of the first embodiment. The "first communication passage from the inner clearance of the bearing 6" may be eliminated and the first communication passage may be only the passage starting from the downward hole 8a provided in the upper half of the bearing cage 8 shown in this embodiment. Furthermore, as described above, since the seizure symptom of the clutch 3 is more remarkable in the anti-drive gear side clutch 3 than in the drive gear side clutch 3, the downward hole 8a is provided in the upper half of the bearing cage 8 on the anti drive gear side. It may be provided only.

(2) First communication passage R1 in each of the above embodiments
As illustrated in FIG. 1, it is preferable that at least the outer side of the inner wall of the side gear 1 be provided with a portion that gradually inclines toward the outer side toward the outer periphery of the rear surface shaft 1a (Comparative P
2.P02).

The details are as follows. Figure 2 shows the differential cover 2
3A and 3B are assembly diagrams of the thrust washer 4 and the side gear 1. FIG. 7A shows the differential cover 2, FIG. 7B shows the thrust washer 4, and FIG. Figure 3
3A shows the outer side surface of the differential cover 2, and FIG. 3B shows the inner side surface of the differential cover 2. Incidentally, referring to FIGS. 4 to 7 together with FIG. 2, FIG. 4 is an inner side surface of the thrust washer 4, FIG. 5 is an outer side surface of the side gear 1, and FIGS. 6 and 7 are the plate 3a and the disc as described above. 3b is shown.

That is, as shown in FIG. 2 (a), a part of the first communication passage R1 has a drive shaft 7 fitted by a spline 1b (see FIG. 2 (c)) in the rear shaft 1a of the side gear 1. Is formed by a gap with respect to the drive shaft 7 from the through holes 2c in both ends of the differential cover 2 that surrounds the drive shaft 7. Here, the through holes 2c and the like are configured so as to widen toward the outer circumference of the rear surface shaft 1a of the side gear 1 by θ1 and θ2.

The operation and effect are as follows. Oil is viscous.
Therefore, when the differential cover 2 and the drive shaft 7 rotate,
The oil in contact with the differential cover 2 and the drive shaft 7 is accompanied by the viscosity of the oil and eventually produces a centrifugal force. This centrifugal force attracts the oil itself to the outer periphery of the rear shaft 1a of the side gear 1. Therefore, the seizure of the clutch 3 can be prevented more reliably.

(3) In each of the above embodiments, the passage 1c is preferably drilled in the outer peripheral portion of the rear shaft 1a of the side gear 1 (comparison P5 / P05). Of course, this passage 1c is also a part of the first communication passage R1.

The details are as follows. As shown in FIGS. 2 (c) and 5, a longitudinal hole 1c1 (lateral hole 1c1) is bored in the outer periphery of the rear shaft 1a of the side gear 1 in the axial direction, and a lateral hole 1c1 is provided at the facing portion between the plate and the disc 3b. A plurality of vertical holes 1c2 opened at are formed.

The operation and effect are as follows. The oil that has reached the horizontal hole 1c1 flows into the horizontal hole 1c1 and flows from the horizontal hole 1c1 to the vertical hole 1c2.
Out of the vertical hole 1c2 by centrifugal force between the facing portions of the plate and the disc 3b. After that, the oil lubricates the plate and the disc 3b. Therefore, the seizure of the clutch 3 can be prevented more reliably.

The horizontal hole 1c1 and the vertical hole 1c2 may be collectively referred to as a "groove". This "groove" is also the passage 1c. However, in this case, a plurality of plates 3a and discs 3
The amount of oil flowing in the gap with b is large on the outside, but decreases as it goes inside. Therefore, in order to obtain such a configuration, it is suitable in a configuration in which a sufficient amount of oil is secured. Since the configuration of this embodiment is an additional configuration to each of the above-described embodiments in which a sufficient amount of oil is secured, the "passage 1c" may be a "groove".

(4) In each of the above embodiments, FIG.
Further, as shown in FIG. 5, it is desirable to form a groove 1d communicating with the passage 1c on the back surface of the back shaft 1a of the side gear 1 (comparison P5 / P05). This is because the lubrication of the thrust washer 4 shown in FIG. 4 can be promoted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a clutch type limited slip differential according to the present invention.

FIG. 2 is an assembly diagram of a differential cover, a thrust washer, and a side gear. (A) shows the differential cover,
(B) shows a thrust washer, (c) shows a side gear.

FIG. 3 is a plan view of the differential cover, in which (a) shows an outer side surface and (b) shows an inner side surface.

FIG. 4 is an inner side view of the thrust washer.

FIG. 5 is an outer side view of a side gear.

FIG. 6 is a plan view of a plate.

FIG. 7 is a plan view of a disc.

FIG. 8 is a sectional view of a conventional clutch type limited slip differential.

[Explanation of symbols]

1: side gear, 1c: passage, 1d: groove, 1a: rear shaft, 2: differential cover, 3: clutch, 3a: plate,
3b: disc, 4: thrust washer, 5: differential case, 6: bearing, 7: drive shaft, 8: bearing cage, 8a: downward hole, 9: baffle, 10: drive gear, S1: first oil reservoir region, S2 : Second oil reservoir area, R
1: First communication passage, R2: Second communication passage.

Claims (6)

[Claims] 1. In a clutch type limited slip differential, an outer periphery of a rear shaft (1a) of a side gear (1) and a differential cover.
A clutch (3) that is installed between the inner circumference of (2) and is connected intermittently to transmit power between the rear shaft (1a) of the side gear (1) and the differential cover (2), and the differential The first oil sump area (S1) in the differential case (5) in which the drive gear (10) dips below the oil surface is distinguished from the other second oil sump area (S2) in the differential case (5), and the first, The baffle (9) in the differential case (5), which allows the oil flow between the second oil sump regions (S1) and (S2) while hindering it, the drive shaft (7) and the differential cover (2), the bearing (6 ), The bearing cage (8) at the end of the differential case (5), which is rotatably supported respectively, and the atmosphere opening part provided in the bearing cage (8) communicates with the outer circumference of the rear shaft (1a) of the side gear (1). A clutch-type limited slip differential having a first communication passage (R1) and a second communication passage (R2) communicating with the atmosphere from the inner circumference of the differential cover (2). 2. The clutch-type limited slip differential according to claim 1, wherein the atmosphere opening portion provided in the bearing cage (8) is an internal clearance of the bearing (6) in the bearing cage (8). 3. The clutch-type limited slip differential according to claim 1, wherein the atmosphere opening portion provided in the bearing cage (8) is a downward hole (8a) provided in an upper half of the bearing cage (8). 4. The first communication passage (R1) has a portion that gradually inclines outward as at least the outer side of the inner wall of the first communication passage (R1) extends toward the outer periphery of the rear surface shaft (1a) of the side gear (1). The clutch type limited slip diff according to 2 or 3. 5. The passage (1c) is bored in the outer peripheral portion of the rear shaft (1a) of the side gear (1), and the passage (1c) is part of the first communication passage (R1). The clutch type limited slip diff according to 3 or 4. 6. The side gear (1) is provided with a groove (1d) communicating with a passage (1c) formed in the outer peripheral surface of the rear shaft (1a) of the side gear (1).
The clutch type limited slip differential according to claim 5, wherein the rear axle (1a) is formed on the rear surface of the rear shaft (1a).