JPS6233641Y2 - - Google Patents

Description

[Detailed description of the invention] This invention aims to reduce the rotational resistance of the axle on the non-drive side during two-wheel drive driving of a four-wheel drive vehicle, thereby improving fuel efficiency. This invention relates to a freewheel hub mechanism that can interrupt transmission.

A fully floating type axle is generally used for four-wheel drive vehicles. As is well known, this fully floating axle is a type for large vehicles that does not burden the axle shaft with any load other than driving and braking. The axle hub is rotatably supported on the outer periphery of the axle housing end. With this structure, the freewheel hub mechanism can be easily constructed by arranging a clutch member between the axle hub and the axle shaft that can transmit or isolate rotation between them. .

However, recently, four-wheel drive has been adopted in small cars, and small cars generally use semi-floating type axles. A semi-floating axle is a type in which the load and external force are split equally between the axle shaft and the axle housing, and the drive of the axle shaft is directly transmitted to the disc wheel. For this reason, unlike the case of the above-mentioned fully floating axle, it has been extremely difficult to employ a freewheel hub mechanism.

The object of the present invention is to provide a freewheel hub mechanism that can be easily applied to semi-floating axles, regardless of whether it is a production factory or a general repair shop.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be explained in detail according to the Example shown in drawing.

In FIG. 1, which shows the main parts of a semi-floating axle that is on the non-drive side during two-wheel drive of a four-wheel drive vehicle, an axle shaft 2 inserted into an axle housing 1 is connected to the inner peripheral surface of this housing 1. On the other hand, it is rotatably supported by a roller bearing 3. In addition, this axle shaft 2 is
As mentioned above, during two-wheel drive, power transmission between the engine and the transmission is cut off within the transmission. A flange 6, which is integrally formed at the base of the extension shaft 5, is fixed to a flange 4 integrally formed at the end of the axle shaft 2 by bolts and nuts 7. Naturally, this extended shaft portion 5 is designed to be concentric with the axle shaft 2.

An axle hub 8 is mounted on the outer periphery of the extension shaft portion 5, and a ball bearing 9 that carries a load in the radial direction is mounted on the outer periphery of the extension shaft portion 5.
It is rotatably supported by a needle roller bearing 10 that receives a load in the thrust direction. A flange 8a located on the outer periphery of this axle hub 8 has a disc wheel 1 on the wheel side.
1, a brake drum 12, and an oil deflector 13 are integrally fixed by a bottle nut 14. Note that the above-mentioned extension shaft portion 5, axle hub 8, bearings 9, 10, and their attached parts are added members in this embodiment, but it is important to note that this axle structure maintains a semi-floating aspect. There is no difference.

Next, the freewheel hub mechanism will be explained. A clutch cover 15 is fixed to the outer end surface of the axle hub 8 with bolts 16. A spline 18 is formed on the inner peripheral surface of the clutch cover 15, and the clutch member 17 is fitted therein so as to be slidable in the left-right direction in FIG. Further, a handle plate 20 is provided on the outer end surface of the clutch cover 15 so that the handle plate 20 can be rotated from the outside.
When 0 is rotated, the follower 21
is adapted to move in the left-right direction in FIG. That is, when the clutch member 17 is in the position shown by the imaginary line in FIG. 17 is engaged with the outer peripheral spline 19 of the extension shaft portion 5 while being engaged with the spline of the clutch cover 15 as shown by the solid line. As a result, the extension shaft portion 5 and the axle hub 8 are coupled through the clutch member 17 and the clutch cover 15 so that rotation can be transmitted. When the handle plate 20 is rotated in the opposite direction, the clutch member 17 returns to the position shown by the imaginary line in FIG.
The connection with is canceled.

In the above configuration, when running in four-wheel drive, the clutch member 1 of the freewheel hub mechanism
7 to the state shown by the solid line in FIG. 1, and the extension shaft portion 5 and the axle hub 8 are brought into the connected state as described above. As a result, the rotational driving force of the axle shaft 2 is transmitted to the disc wheel 11 on the wheel side, thereby actively driving the wheel.

During two-wheel drive driving when the axle of this embodiment is switched to non-drive, the coupling between the extension shaft 5 and the axle hub 8 is released by operating the clutch member 17 to the state shown by the imaginary line in FIG. .
Then, the axle shaft 2 and the wheel side are separated and the wheel is in a idling state, and even if this wheel rotates, the axle shaft 2 and the drive system connected to it are not interlocked, thereby reducing running resistance. At the same time, durability improves.

As shown in FIG. 2, the bearings 9 and 10 between the extended shaft portion 5 and the axle hub 8 may be replaced with double-row ball bearings 22 that can bear loads in both the radial direction and the thrust direction.

In addition, if the above-mentioned freewheel hub mechanism is not adopted, as shown in FIG. 3, a hub 8A having a different shape from the axle hub 8 shown in FIGS. 1 and 2 is attached to the flange 4 of the axle shaft 2. Fix directly with bolts and nuts 7. Needless to say, a disk wheel 11, a brake drum 12, etc. are fixed to this hub 8A with bolts and nuts 14.

Note that the freewheel hub mechanism having the above structure can be easily applied to an independent suspension type axle.

As described above, the present invention provides an axle for a semi-floating four-wheel drive vehicle, including an extension shaft removably connected to the end of the axle shaft from the outside, and an outer circumferential surface of the extension shaft. The axle shaft is rotatably supported by a bearing, and a clutch member is disposed between the axle hub, which is fixed to the disc wheel, and is capable of switching between mutual rotation transmission or rotation transmission cutoff. Even if the axle is a semi-floating type four-wheel drive vehicle that is rotatably supported on the inner peripheral surface of the axle housing by a bearing, it can be It has the advantage that the freewheel hub mechanism can be easily adopted, and that the freewheel hub mechanism can also be provided in the general market by simple replacement of parts.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view showing the main parts of a semi-floating axle, and FIG. 2 is a sectional view showing a different embodiment in correspondence with a part of FIG. 1. , FIG. 3 is a sectional view corresponding to FIG. 1, showing the axle structure without the freewheel hub mechanism assembled. DESCRIPTION OF SYMBOLS 1... Axle housing, 2... Axle shaft, 5... Extension shaft, 8, 8A... Axle hub, 11... Disc wheel, 15... Clutch cover, 17... Clutch member, 18, 19
……spline.

Claims (1)

[Scope of utility model registration request] The axle is the non-drive side during two-wheel drive in a four-wheel drive vehicle, and the axle shaft, which is inserted into the axle housing and transmits rotation to the disc wheel, can rotate against the inner peripheral surface of the housing using bearings. A semi-floating shaft-supported axle for a four-wheel drive vehicle includes an extension shaft removably connected to the end of the axle shaft from the outside, and a bearing attached to the outer peripheral surface of the shaft. an axle hub that is rotatably supported by the shaft and fixed to the disk wheel, and a clutch member that is disposed between the extension shaft portion and the axle hub so as to be able to switch between mutual rotation transmission or rotation transmission cutoff. Freewheel hub mechanism for axle for four-wheel drive vehicles.