JPH0522667Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a power source having a gear means such as a gear mechanism consisting of a single gear or a plurality of gears supported on a drive shaft so as to be relatively rotatable. The present invention relates to an improvement in a thrust regulating device that regulates axial thrust movement of a gear means in a transmission device as it rotates relative to a drive shaft.

(Prior Art) Conventionally, for example, in a transmission for an automobile,
As shown in Japanese Utility Model Publication No. 58-7139, a part of the drive shaft having a spline portion on the outer circumferential surface is used as a device to prevent the bearing for supporting the drive shaft (main shaft) in the housing from coming out from the drive shaft. An annular groove without a spline part is formed, and a split-type annular washer (stopper plate) divided in the radial direction is fitted into the annular groove, and the drive shaft spline part on the side of the split washer is fitted. It is known that a holder that restricts the radial expansion of the washer is integrally coupled with the holder to reliably prevent the bearing on the drive shaft from being pulled out.

When this split type washer is used, the washer can be installed from the radial direction of the drive shaft, and there is no need to install it from the axial direction as with ordinary types, so there is no need to restrict the movement of the washer on the drive shaft. This eliminates the need for step portions with different diameters, which has the advantage that the overall diameter of the drive shaft can be set to a small diameter.

(Problem to be solved by the invention) By the way, in a transfer device equipped with a center differential installed in a four-wheel drive vehicle that simultaneously drives the front and rear wheels, engine power is transferred to the center differential rotatably supported on the drive shaft. The power distributed to the front and rear wheels is transmitted to one wheel via a sprocket rotatably supported on a drive shaft adjacent to the center differential and a chain that meshes with the sprocket. There is a structure. However, in the transfer device with this structure, when each of the sun gear, pinion gear, and ring gear that constitutes the center differential is a helical gear, a large thrust force in the axial direction acts on the center differential due to the rotation of each gear.
This thrust force may cause the center differential to thrust in the axial direction.

Therefore, in order to restrict the thrust movement of the center differential as a gear means, using the concept of the conventional example described above, a split washer divided in the radial direction and a holder that restricts the expansion of the washer in the radial direction are attached to the center differential side. A thrust bearing consisting of a needle bearing or the like is fitted between the center differential and the holder in order to ensure the rotation of the center differential and to receive the strong thrust force from the center differential with the washers. is possible.

However, in that case, the center differential and sprocket are rotatably supported by the drive shaft, so
The drive shaft has no spline portion, and the split washer and its holder rotate relative to the drive shaft. For this reason, the rotation of the holder that contacts the thrust bearing makes it difficult for the needles and the like constituting the thrust bearing to roll, making it difficult to fully demonstrate the original function of the thrust bearing.

The present invention was developed in view of the above, and its purpose is to prevent the above-mentioned split-type washer and its holder from rotating relative to the drive shaft. While the diameter of the drive shaft is reduced by use, even if the gear means such as a center differential adjacent to the washer rotates relative to the drive shaft, each needle of the thrust bearing arranged between the two can be securely fixed. Therefore, the thrust movement of the gear means can be more reliably regulated.

(Means for Solving the Problems) In order to achieve this object, the solution means of the present invention is provided by a means for solving the problem that occurs when a gear means rotatably supported on a drive shaft in a power transmission device rotates relative to the drive shaft. The thrust regulating device for regulating thrust movement in the axial direction is divided into a plurality of parts in the radial direction, and each of the divided parts has an engaging part that rotationally engages with the drive shaft located on the front side in the thrust movement direction of the gear means. a split washer, and an engagement supported on the drive shaft between the split washer and the gear means, and on a side surface of the split washer that rotationally engages with the split washer to restrict its expansion in the radial direction. The present invention is configured to include a holder having a bearing receiving surface on the side surface on the gear means side, and a thrust bearing held by the bearing receiving surface of the holder.

(Function) With this configuration, in the present invention, the split washer is installed from the radial direction of the drive shaft, so there is no need to provide a stepped portion with a different diameter on the drive shaft to restrict the movement of the washer. Therefore, the diameter of the drive shaft can be reduced overall.

Further, the split washer attached to the drive shaft is rotationally and integrally engaged with the drive shaft by each engaging portion, and the holder that restricts the radial expansion of the split washer is rotationally and integrally engaged with the split washer. As a result, the holder rotates integrally with the drive shaft, and a relative rotational difference occurs between the holder and the gear means rotatably supported on the drive shaft. From this,
Each needle of the thrust bearing held by the bearing surface of the holder will surely roll between the relatively rotating holder and the gear means, and thus the original function of the thrust bearing will be maintained. This means that it can be secured in a good manner.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows the overall configuration of an embodiment of the present invention, 1
1 is a transfer device as a power transmission device installed in a so-called part-time four-wheel drive vehicle, and this transfer device 1 is equipped with a transfer case 2, which includes a transmission (not shown). an input shaft 3 as a drive shaft connected to the input shaft 3; a front output shaft (not shown) disposed on the side of the input shaft 3 in parallel with the input shaft 3; A rear wheel side output shaft 4 disposed on the same axis as the input shaft 3 is rotatably supported on the right side in the figure.

A planetary gear type center differential 5 constituting gear means is disposed at the rear end of the input shaft 3.
The sun gear 6, pinions 7, and ring gear 8 of the center differential 5 are helical gears, and the rotation of the gears 6 to 8 of these helical gears causes the center differential 5 to receive thrust force forward. The sun gear 5 is rotatably supported on the input shaft 3, a pinion carrier 9 carrying each pinion 7 is rotatably spline-coupled to the input shaft 3 on the rear side of the sun gear 5, and the ring gear 8 is connected to the rear wheel side output. It is rotatably coupled to the shaft 4.

Furthermore, a drive sprocket 10 is mounted on a radial bearing 1 on the input shaft 3 on the front side of the center differential 5.
A chain 12 is wound between the sprocket 10 and a driven sprocket (not shown) rotatably coupled to the front output shaft. This chain 12 is configured to transmit the rotation of the input shaft 3 to the front wheel side output shaft.

Further, the sun gear 6 and ring gear 8 of the center differential 5 are each extended forward, and a clutch hub 13 having spline teeth 13a on the outer peripheral surface is rotatably coupled to the front end of the extension 6a of the sun gear 6. On the other hand, the extension part 8a of the ring gear 8 is supported on the outer periphery of the extension part 6a of the sun gear 6 through a radial bearing 14 so as to be relatively rotatable, and the outer periphery of the extension part 8a has the same shape as the spline tooth part 13a on the outer periphery of the clutch hub 13. A spline tooth portion 8b of a diameter is formed. Further, the driving sprocket 10 is extended rearward, and a spline tooth portion 10b having the same diameter as a spline tooth portion 13a on the outer circumference of the clutch hub 13 is formed on the outer periphery of this extended portion 10a. The clutch hub 13 and the ring gear 8 in the center differential 5
and each spline tooth portion 13a, 8b, 10b of the extension 8a of the drive sprocket 10 and the extension 10a of the drive sprocket 10.
The sleeve 15 has spline teeth 15 on its inner circumference.
A switching mechanism 1 is slidably spline-coupled at a portion a, and is configured to switch the center differential 5 between a free state and a locked state, or between a two-wheel drive state and a four-wheel drive state, by sliding the sleeve 15.
6 are configured. That is, this switching mechanism 1
6 indicates that when the sleeve 15 is positioned at the front end position, the clutch hub 13 and the drive sprocket 10
The ring gear 8 of the center differential 5 and the sun gear 6
By disconnecting the center differential 5 from the center differential 5, the center differential 5 is brought into a free state. When the clutch hub 13 and the drive sprocket 10 are rotationally connected to each other in the same way as described above, a four-wheel drive state is established, and the ring gear 8 of the center differential 5 is
and the sun gear 6 to lock the center differential 5. Furthermore, when the sleeve 15 is positioned at the rear end position as shown by the solid line in the figure,
While connecting the ring gear 8 and sun gear 6 of the center differential 5 to lock the center differential 5,
The clutch hub 13 and drive sprocket 10 are disconnected from each other to create a two-wheel drive state.

The front portion of the input shaft 3 in the thrust direction of the center differential 5, that is, the extension portion 6a of the sun gear 6 in the center differential 5 and the drive sprocket 10.
A thrust regulating device 17 according to an embodiment of the present invention is provided on the input shaft 3 between the input shaft 3 and the extension portion 10a. As shown in FIG. 2, this thrust regulating device 17 includes a ring-shaped divided washer 18 that is divided into two parts in the radial direction, and at the center of the inner peripheral edge of each divided part 19 of the divided washer 18, there is a ring-shaped divided washer 18 that projects toward the center. A first engagement protrusion 19a serving as an engagement portion and a second engagement protrusion 19b protruding radially outward are integrally formed at the center of the outer peripheral edge of each divided portion 19, respectively. Further, a washer fitting groove 20 having a smaller diameter than other parts is formed on the outer peripheral surface of the input shaft 3 between the sun gear extension part 6a and the sprocket extension part 10a. 1
A pair of locking holes 21, 21 are formed to face each other in the diametrical direction. And the above split washers 1
8 is the first engaging protrusion 19a of each divided portion 19;
The split washer 18 is fitted into each locking hole 21 of the washer fitting groove 20 at its inner periphery, and with this structure, the split washer 18 is rotatably integrated with the input shaft 3 and rotates integrally with the input shaft 3. are immovably engaged in the direction.

Further, on the input shaft 3 between the split washers 18 and the extension part 6a of the sun gear 5 in the center differential 5 (on the center differential 5 side of the washers fitting groove 20), there is a radial direction generated by the centrifugal force accompanying the rotation of the split washers 18. A disk-shaped holder 22 that restricts the expansion of the input shaft 3 is supported with the input shaft 3 inserted through its center hole 22a. The washer 18 side side of the holder 22 includes a washer fitting portion 23a into which the split washer 18 can be fitted, and a washer fitting portion 23a into which the split washer 18 can be fitted.
An engaging portion 23 is formed by cutting out diametrically opposing portions of the flange-shaped outer peripheral wall portion a to the inner deep surface of the washer fitting portion 23a, and consisting of a pair of engaging recesses 23b, 23b. , a split washer 18 is installed in the washer fitting part 23a of this engaging part 23,
By inserting the second engaging protrusion 19b on the outer periphery of each divided portion 19 into the engaging recess 23b of the holder 22 in a locked state, the holder 22 is connected to the divided washer 18, that is, the input shaft 3. Rotationally engaged.

On the other hand, a concave bearing receiving surface 24 is formed on the side surface of the holder 22 on the center differential 5 side. As shown in FIG. 1, the bearing surface 24 of this holder 22 has a large number of needles 25a, 25a, . Thrust bearing 25 consisting of bearings
The thrust bearing 25 is configured to restrict thrust movement in the axial direction as the center differential 5 rotates.

Therefore, in the above embodiment, as the center differential 5 rotates, a thrust force in the axial direction is generated forward in the center differential 5 due to the meshing of the sun gear 6 composed of a helical gear, each pinion 7, and the ring gear 8. The thrust movement of the center differential 5 is achieved by a split washer 18 engaged on the input shaft 3.
regulated by.

In that case, the split washer 18 has two parts in the radial direction.
It is divided into parts and is attached to the input shaft 3 from its radial direction. For this reason, there is no need to provide a stepped portion with a different diameter on the input shaft to restrict the movement of the washer as in a normal ring-shaped washer, and only the fitting groove 20 into which the washer 18 is fitted can be formed partially. Therefore, the diameter of the input shaft 3 can be reduced as a whole.

In addition, a split washer 18 attached to the input shaft 3
Since the split washer 18 is engaged with the input shaft 3 by the first engaging projections 19a of each split portion 19 so as to rotate integrally with the input shaft 3, and a holder 22 which restricts the radial expansion of the split washer 18 is engaged with the split washer 18 so as to rotate integrally with the input shaft 3, the holder 22 rotates integrally with the input shaft 3, and this integral rotation causes the holder 22 and the center differential 5 on the input shaft 3 to rotate relative to each other.
a denotes the holder 22 and the center differential 5 which rotate relative to each other.
As a result, the thrust bearing 25 can satisfactorily perform its original function.

Furthermore, the washer fitting portion 23 of the holder 22
In the divided washer 18 fitted to the part a, a gap is formed between the opposing parts of the two divided parts 19, 19.
Therefore, lubricating oil is retained in the gap, and by retaining this oil, the sliding resistance of the drive sprocket 10 that rotates at high speed, although the thrust force is small, can be lowered against the washer 18.
Its lubricity can be improved.

In the above embodiment, the center differential 5 in the transfer device 1 for a part-time four-wheel drive vehicle is
We explained the case of regulating the thrust of
The present invention is not limited to this embodiment, but is applicable to other various power transmission devices in which the thrust movement in the axial direction accompanying the relative rotation of a gear means rotatably supported on the drive shaft with respect to the drive shaft is restricted. Of course, it can also be applied to

(Effects of the invention) As explained above, according to the invention, when regulating the thrust movement accompanying the relative rotation of the gear means relatively rotatably supported on the drive shaft in a power transmission device, the diameter A divided washer divided in the direction is rotationally engaged with the washer, a holder for regulating the expansion of the divided washer in the radial direction is rotationally engaged with the washer, and a thrust bearing is provided between the holder and the gear means. By fitting the split washer to the drive shaft from the radial direction, the diameter of the drive shaft can be reduced as a whole, and the split washer can be rotated integrally with the drive shaft and By rotationally integrating with the holder, the holder into which the thrust bearing is fitted and the gear means can be reliably rotated relative to each other, and the function of the thrust bearing can be effectively ensured.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a cross-sectional view showing the configuration of the main part of a transfer device, and Fig. 2 is an exploded perspective view of the main part of a thrust regulating device. 1... Transfer device, 3... Input shaft, 5...
...Center differential, 10...Sprocket, 17...
Thrust control device, 18 ... Split washer, 19
...Dividing portion, 19a...Engagement protrusion, 22...Holder, 23...Engagement portion, 24...Bearing receiving surface,
25...Thrust bearing.

Claims (1)

[Claims for Utility Model Registration] A thrust regulating device for regulating thrust movement in an axial direction accompanying relative rotation of a gear means rotatably supported on a drive shaft of a power transmission device with respect to the drive shaft, a divided washer that is divided into a plurality of parts in the radial direction and has an engaging part in each divided part that rotatably engages with a drive shaft located on the front side in the thrust movement direction of the gear means; and a split washer and the gear means; It is supported on the drive shaft between the parts, and has an engaging part on the side surface on the split washer side that rotationally engages with the split washer to restrict its expansion in the radial direction, and a bearing receiving surface on the side surface on the gear means side. What is claimed is: 1. A thrust regulating device for a power transmission device, comprising: a holder having the following: and a thrust bearing held by a bearing receiving surface of the holder.