JPH0332839Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a differential device for a vehicle, and particularly to a differential device with a differential limiting mechanism.

[Prior art] Generally, the two left and right output shafts connected to a differential device with a differential limiting mechanism have the same length.
The ends inside the differential case are fixed to the side gears on each output shaft side. Differential movement between the two axles is limited through mutual clutch plates between each side gear and the differential case.

On the other hand, one output shaft of the two left and right output shafts is made to protrude from the differential gear mechanism including the side gear toward the other output shaft side, and the ends of both output shafts are brought into contact with each other,
A rotary plate that limits differential movement is directly attached to the end of each output shaft via a sleeve, and each rotary plate is placed in a sealed chamber filled with viscous fluid such as silicone oil. There is.

This configuration has the advantage that the relative rotation of both axles directly acts through each sleeve on the differential limiting mechanism using the shear resistance of the viscous fluid caused by the rotary plate, so the differential limiting force can be large. be.

[Problems to be solved by the invention] However, in such a conventional differential gear with a differential limiting mechanism, one output shaft protrudes from the differential gear mechanism toward the other output shaft. Since the ends of both output shafts are in contact near the differential limiting mechanism, there is a problem that the lengths of both output shafts are different, making it impossible to share the output shaft, and the differential case of the output shaft protrudes. There is a problem in that the bending moment generated at the inner tip mainly places a load on the contact portion of the differential limiting mechanism with the inner circumferential surface of the differential case, causing significant wear and reducing the durability of the differential limiting mechanism.

To solve this problem, JP-A-51-
This is disclosed in FIG. 1 of Publication No. 99769. The device described in this publication has a cylindrical boss connected to one end of the output shaft and provided with a rotating plate on the outer periphery between the left and right output shafts inserted into the differential case, and a cylindrical boss connected to the other end of the output shaft. A hollow chamber body having a rotary plate provided on the inner circumference side and covering the outer circumference side of the cylindrical boss is interposed therebetween, and both output shafts are connected to each other by these. A viscous fluid such as silicone oil is sealed in a sealed chamber surrounded by a cylindrical boss and a hollow chamber, and shear resistance of the viscous fluid due to the relative rotation of the rotating bodies arranged in the sealed chamber , differential restriction between the left and right output shafts is performed.

The hollow chamber body coupled to the other output shaft has a coupling portion spline-coupled to the outer periphery of the output shaft, a disk-shaped first end wall formed continuously from the end of the coupling portion, and this end wall. a tube wall having one end joined to the outer peripheral end of the pipe wall and having the rotary plate provided on the inner peripheral side; and a second pipe wall joined to the other end of the pipe wall and disposed opposite to the first end wall. It has an end wall. Further, the cylindrical boss coupled to one of the output shafts has one end joined to the end of the output shaft, and a spline groove is formed on the outer periphery of each of the cylindrical bosses, and the spline groove engages with both spline grooves. It is coupled to the output shaft by a sheath member having a. The other end of the cylindrical boss contacts the side surface of the inner peripheral end of the first end wall of the hollow chamber body, and the inner end of the first end wall near this contact portion includes:
A disk-shaped plug that seals the hollow chamber is fixed in a contactable manner to the end of the output shaft.

In this way, by providing the cylindrical boss and hollow chamber body, which are the components of the differential limiting mechanism, between the left and right output shafts, the axial lengths of these can be adjusted, making it possible to share both the left and right output shafts. In addition to being possible, there is no need for both output shafts to protrude into the differential case.
The bending moment generated at the tip of the output shaft does not strongly act on the contact portion of the differential limiting mechanism with the inner peripheral surface of the differential case, thereby improving the durability of the differential limiting mechanism.

By the way, in such conventional technology, for example, when a thrust force is generated from the output shaft on the hollow chamber side toward the output shaft on the cylindrical boss side, this thrust force is first transferred from the output shaft on the hollow chamber side to the hollow chamber body. 1st of
The output shaft enters a plug fixed to the inner end of the end wall, and acts on the output shaft on the opposite side via this end wall and the cylindrical boss. However, since the thrust force of the output shaft on the hollow chamber body side at this time acts locally on the inner end of the first end wall through the plug, there is a risk of deforming this end wall, causing the plug and the first end wall to deform. There is a possibility that damage may occur at the joint with the end wall of the first end wall and at the joint between the first end wall and the pipe wall on which the rotating body is provided on the inner peripheral side.

Furthermore, the silicone oil sealed inside the hollow chamber generally does not have lubricity, but despite this, the thrust force from both the left and right output shafts is generated between the first end wall and the cylindrical boss. Since the first end wall and the cylindrical boss rotate relative to each other, seizure is likely to occur between the first end wall and the cylindrical boss, resulting in poor durability.

This idea was devised by focusing on these conventional problems, and in addition to making both output shafts common, it also prevents the excessive load caused by the bending moment of the output shaft that is applied to the inner peripheral surface of the case of the differential limiting mechanism. To provide a differential device with a differential limiting mechanism, which prevents this and improves the durability of a member provided between both output shafts even when a thrust force is applied from one output shaft to the other output shaft. purpose.

[Means for Solving the Problems] In order to achieve this object, this invention rotates in response to the driving force of the input shaft, and includes a differential case that is rotatably equipped with a first output shaft and a second output shaft. In, the first
a first side gear and a second side gear that rotate in conjunction with the output shaft and the second output shaft, respectively; and a first side gear and a second side gear that mesh with each of the first and second side gears and are rotatably provided with respect to the differential case. a pinion gear, and a first rotary plate and a second rotary plate arranged opposite to each other in a sealed chamber filled with viscous fluid and provided on the first output shaft side and the second output shaft side, respectively. In the differential device with a differential limiting mechanism, a block-shaped connecting member that contacts each output shaft is interposed between the first and second output shafts, and the connecting member and the the first output shaft and the respective outer peripheral portions and the first output shaft.
The first rotary plate is attached to a first sleeve attached to the connecting member, and the second rotary plate is connected to the second output shaft and The second sleeve is connected to the second side gear and is attached to a second sleeve that forms the sealed chamber with the first sleeve.

[Example] Hereinafter, an example of this invention will be described based on the drawings.

The differential case 1 can be rotated by a drive pinion (not shown) via a ring gear attached to the differential case 1.
A differential gear mechanism 3 is housed inside. The differential gear mechanism 3 includes a pinion shaft 5 attached to the differential case 1, a pinion 7 rotatably attached to the pinion shaft 5, and a gear mechanism that meshes with the pinion 7 and is rotatable with respect to the differential case 1 on the right side in the figure. A side gear 11 as a first side gear connected to the first output shaft 9, and a second output shaft 13 rotatable with respect to the differential case 1 on the left side in the figure and provided at a distance from the first output shaft 9. It is composed of a side gear portion 15 as a second side gear connected to the side. Above side gear part 1
5 is integrally formed on the side surface of the side plate 17.

A spline 19 and a spline 21 are formed on the outer periphery of the first output shaft 9 and the inner periphery of the side gear 11, respectively, and the side gear 11 and the first output shaft 9 are connected by the connection of both splines 19 and 21, and the output The shaft 9 is connected to one wheel not shown. A spline 23 is formed on the outer periphery of the second output shaft 13 on the left side in the figure.
A collared sleeve 27 having a spline 25 on the inner circumference connected to the second output shaft 13 is connected to the second output shaft 13;
This output shaft 13 is connected to the other wheel not shown. One side edge of a cylindrical large-diameter sleeve 29 is fixed to the side surface of the outer circumferential edge of the flange portion 27a of the flange sleeve 27, and the inner circumferential surface of the other side edge of this large-diameter sleeve 29 is The outer periphery of the side plate 17 is fixed. The flange sleeve 27 and the large diameter sleeve 29 constitute a second sleeve.

Further, a block-shaped connecting member 31 is interposed between the first and second output shafts 9, 13 so as to contact the mutually opposing ends of both the output shafts 9, 13. A spline 33 is formed on the outer periphery of the connecting member 31 over the entire length in the left-right direction, and this spline 33 is connected to a spline 35 provided on the inner periphery of a stepped sleeve 37 as a first sleeve. Also, the spline 3 on the first output shaft 9 side of the connecting member 31
The spline 21 of the side gear 11 is connected to the spline 3, thereby connecting the connecting member 31 and the first output shaft 9.

The outer circumferential surface of the small diameter portion 37a of the stepped sleeve 37 is in rotatable contact with the inner circumferential surface of the side plate 17, while the inner circumferential surface of the large diameter portion 37b of the stepped sleeve 37 is in contact with the outer circumferential surface of the flange sleeve 27. are in rotatable contact with each other.

And the flange portion 27a of the flange sleeve 27,
An annular sealed chamber 3 surrounded by the large diameter sleeve 29, the side plate 17, and the large diameter portion 37b of the stepped sleeve 37
9 is filled with a viscous fluid such as silicone oil. Furthermore, the sealed chamber 39 contains the outer periphery of the stepped sleeve 37 on the side of the first output shaft 9 and the second output shaft 1.
A first rotary plate 41 and a second rotary plate 43 are respectively attached to the inner periphery of the large diameter sleeve 29 on the third side.
are arranged facing each other alternately with a small interval between them. The viscous fluid is interposed between the rotary plates 41 and 43, and relative rotation between the first and second output shafts 9 and 13 generates shear resistance, thereby exerting a differential limiting function.

Next, the operation of the differential device configured as described above will be explained.

When there is no relative rotation between the first and second output shafts 9 and 13, that is, when driving in a steady straight line, the driving rotation of the differential case 1 is driven by the pinion 7 which revolves together with the differential case 1, and one by the side gear 11.
to the first output shaft 9, and the other to the side gear part 1.
The signal is transmitted to the second output shaft 13 at the same speed through the side plate 17 having a number 5 formed thereon, the large-diameter sleeve 29, and the flange sleeve 27.

Next, for example, when a slip occurs in a wheel on the first output shaft 9 side, the rotational speed of this output shaft 9 becomes higher than that of the second output shaft 13, and as a result, the pinion 7 rotates. As a result, relative rotation occurs between the first and second rotating plates 41 and 43, which are separately attached to the output shafts 9 and 13, and when each rotating plate 41 and 43 rotates, the viscous fluid creates shear resistance. As a result, a differential limiting function is exhibited between both output shafts 9 and 13. That is, due to the shear resistance of the viscous fluid, the relative rotation between the first and second rotary plates 41 and 43 is kept small, and this rotational force is applied to each of the first and second output shafts 9 and 13.
are respectively transmitted to prevent slips.

At this time, the stepped sleeve 37 of the first output shaft 9
Since the first output shaft 9 is connected to the second output shaft 9 through the connecting member 31, there is no need to extend the first output shaft 9 to the vicinity of the second output shaft 13. It can be formed to have the same length according to the length of the output shaft 13, making it possible to share both output shafts 9 and 13, and since the first output shaft 9 is separate from the connecting member 31, 1, the bending moment at the tip of the output shaft 9 is not transmitted to the connecting member 31, and this bending moment passes through the side plate 17 to the large diameter sleeve 29.
Since the load is not placed on the contact surface with the differential case 1, the load placed on the contact surface, etc. can be reduced, and the durability of the differential limiting mechanism is improved.

Further, the connecting member 31 is provided in a block shape between the first output shaft 9 and the second output shaft 13 in a state that it can come into contact with the ends of each of the output shafts 9 and 13. Even if a thrust force is applied from each of the second output shafts 9, 13 toward the connecting member 31, there is no risk of the connecting member 31 being damaged. Since it is provided inside the differential case 1, the differential case 1
Due to the lubricating oil for lubricating the differential gear mechanism 3 inside, each output shaft 9, 13 and the connecting member 31 slide due to relative rotation between each of the first and second output shafts 9, 13. However, problems such as burn-in do not occur, and durability is ensured.

[Effects of the invention] As described above, according to this invention, a connecting member is interposed between the first output shaft and the second output shaft, and the connecting member and the first output shaft are further connected. Since the first output shaft is spline-coupled and connected to the rotary plate disposed on the second output shaft side, which limits the differential movement between the two output shafts, through a connecting member, the first and second
By making both output shafts the same length, it is possible to share both output shafts, and the bending moment generated at the tip of the first output shaft can be reduced by the fact that this output shaft and the connecting member are separate bodies. Since this bending moment is not transmitted to the connecting member side and therefore is not transmitted to the differential limiting mechanism, the load placed on the differential limiting mechanism as a whole is reduced and the durability of this mechanism is improved.

Moreover, since the connecting member is provided in a block shape so as to be able to come into contact with the first output shaft and the second output shaft, a thrust force is generated from each of the first and second output shafts toward the connecting member. There is no risk of the connecting member being damaged even if the Even if there is sliding movement between each output shaft and the connecting member due to the relative rotation between the output shafts of No. 2, problems such as seizure do not occur, and durability is ensured.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a differential device with a differential limiting mechanism according to an embodiment of this invention. 1...Differential case, 3...Differential gear mechanism, 7...
...Pinion gear, 9...First output shaft, 11...
Side gear (first side gear), 13...second
output shaft, 15... side gear part (second side gear), 27... flange sleeve (second sleeve), 29... large diameter sleeve (second sleeve),
31... Connection member, 33, 35... Spline,
37...Stepped sleeve (first sleeve), 39
...Sealed chamber, 41...First rotating plate, 43... Second rotating plate.

Claims (1)

[Scope of utility model registration request] A differential case that rotates in response to the driving force of the input shaft and is rotatably equipped with a first output shaft and a second output shaft includes a differential case that rotates in conjunction with the first output shaft and the second output shaft, respectively. A first side gear and a second side gear, a pinion gear meshing with each of the first and second side gears and rotatably provided with respect to the differential case, and facing each other in a sealed chamber in which a viscous fluid is sealed. In the differential device with a differential limiting mechanism, the differential limiting mechanism includes a first rotating plate and a second rotating plate arranged on the first output shaft side and the second output shaft side, respectively. A block-shaped connecting member that contacts each output shaft is interposed between each of the first and second output shafts, and this connecting member and the first output shaft are connected to the respective outer peripheral portions and the first side gear. The first rotary plate is attached to a first sleeve attached to the connecting member, and the second rotary plate is connected to the second output shaft and the second output shaft by spline connection. 1. A differential device with a differential limiting mechanism, characterized in that the second sleeve is connected to a side gear and forms the sealed chamber with the first sleeve.