JPH0427698Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a freewheel hub that is attached to, for example, a vehicle capable of four-wheel drive and is capable of switching between two-wheel drive and four-wheel drive. .

[Conventional technology]

Conventionally, such freewheel hubs include manual and automatic types. In the manual type, a cam is generally rotated by rotating a knob, and the action of the cam causes the dog teeth to engage or disengage with each other, thereby switching the freewheel hub. .

In addition, as an example of an automatic type, JP-A-57-
There is a hub clutch disclosed in Publication No. 12121.
The hub clutch is shown in FIG. Regarding this, the upper half of the drawing shows a state in which the freewheel hub is disengaged and rotation is not transmitted, and the lower half of the drawing shows a state in which rotation is transmitted. That is,
In the upper half, the dog teeth 22 of the slide hub block 24 and the dog teeth 31 of the driven flange 23 are in a disengaged state, whereas in the lower half, they are in a state of meshing. This switching between the engaged and disengaged states is achieved by the operation of the brake 27, the cam member 28 having the cam groove 25, and the pin 26, so that the slide hub block 24 is connected to the drive shaft 30.
This is achieved by sliding on drive teeth 29 attached to the.

[Problem that the invention attempts to solve]

However, such manually operated freewheel hubs have a complicated structure and are expensive to manufacture.Furthermore, there are frequent failures such as forgetting to switch from two-wheel drive to four-wheel drive, making it difficult to use four-wheel drive capable vehicles. There was a problem with the device losing its functionality.

In addition, although the above-mentioned problems can be resolved in the case of an automatic type, the structure is more complicated and the manufacturing cost is higher than that of a manual type.For example, if the transfer does not have a synchronization device, it cannot be switched except when the transfer is stopped. These issues remain as issues. Furthermore, due to the complicated structure, a certain amount of space is required, and these devices protrude outside the tire, which is dangerous.

By the way, generally speaking, the choice between four-wheel drive and two-wheel drive depends on the condition of the road, but these days roads are paved everywhere and are in good condition, so you often have to switch between them. It's starting to disappear.

For example, two-wheel drive is sufficient on most expressways, and in places where there are many muddy or snowy roads, such as in snowy countries where the roads become frozen or snowy in the winter, in other words, spiked tires or chains may be used. The current situation is that in places where it is attached to tires, it is necessary to switch to four-wheel drive, and once switched, it is used in the same state during the winter, so there is a seasonal aspect.

Therefore, the inventor of this invention focused on this point and thought that if there was no need for frequent switching, it would be possible to create a structure that was simpler and could be manufactured at a lower cost. be.

The purpose of this invention is to have an extremely simple structure, to be able to manufacture it at a low cost, to be able to handle it in other words, to make it simple to change over, to avoid mistakes in installation, and to be safe so that the device hardly protrudes outside the vehicle. is to provide a freewheel hub.

[Means for solving problems]

In order to solve these problems and achieve the above objectives, this invention is constructed as follows. That is, this invention includes a flange having a spline on the inner circumferential surface fixed to the hub, a boss fitted with the spline to the axle shaft, and a spline fitted to the boss, which can be inserted into the boss in one direction in the longitudinal direction. The present invention relates to a freewheel hub having a hub block having a spline formed in a part of the outer peripheral surface in the longitudinal direction, which engages with the spline of the flange and becomes disengaged when inserted and installed in the opposite direction in the longitudinal direction.

For this freewheel hub, e.g.
A boss having splines formed on the inner and outer circumferential surfaces is inserted into the spline formed on the outer circumferential surface of the end of the axle shaft, and the flange is rotatably supported by the boss via a bearing. A spline with internal teeth is formed on the inner circumferential surface over approximately half of the longitudinal direction. Further, the flange is fixed to a hub to which a disc wheel, brake drum, etc. is attached, and a hub block is interposed between the flange and the boss. The hub block has a spline formed on the inner peripheral surface over the entire length in the longitudinal direction, and a spline is formed on the outer peripheral surface over a part of the length in the longitudinal direction, more specifically, over approximately half of the length in the longitudinal direction. The hub block can be inserted or replaced in any direction, and the flange and hub block can be engaged or disconnected depending on the direction of insertion.

[Effect]

The freewheel hub according to this invention is constructed as described above and operates as follows. This freewheel hub has the function of transmitting the driving force of the axle shaft to the hub or cutting off the driving force. The engagement or disengagement of the freewheel hub is determined by the direction in which the hub block is inserted.

A spline is formed on the outer peripheral surface of the hub block only half in the longitudinal direction, and the hub block is inserted into the flange, but the flange engages with the spline of the hub block approximately half of the effective length of the flange toward the front. A spline is formed, but the spline is not formed in approximately half of the inner part, which also serves as a relief for machining.

Therefore, if the half spline provided on the outer circumferential surface of the hub block is inserted into the flange first, the hub block and flange will not mesh.
If they are inserted in the opposite direction, they will interlock with each other.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings. In FIG. 1, a freewheel hub according to the invention is illustrated. The freewheel hub can be configured to be easily attached to an existing drive axle that is not provided with a freewheel hub. for example,
In an existing drive axle as shown in FIG. 2, rotation from an axle shaft 1 is transmitted to a hub 3 via a flange 2.

In this case, the flange 2 can be removed from the hub 3 by removing the bolts 11 and stop ring 15. Next, this flange 2
replace it with a freewheel hub based on this invention. By replacing the drive axle, it is possible to engage and disengage the rotation of the drive axle.

In FIG. 1, a spline 10 is formed at the end of an axle shaft 1. As shown in FIG. The hub 3 is rotatably supported by a fixed spindle 21 via a bearing. A disk wheel 19 and a brake drum 20 are fixed to the hub 3.
A flange 4 is fixed to the hub 3 with bolts 11. The flange 4 is formed with internal teeth or splines 13 over a part of the longitudinal direction of the inner peripheral surface thereof, more specifically, over approximately half of the length thereof.

Spline 13 provided on this flange 4
The inner part of the hole 12 has a length approximately equal to that of the spline 13 and has no spline formed therein, which also serves as a relief for machining. Furthermore, the inner part of the hole 12 is reduced in diameter and constitutes the outer race of the radial ball bearing 7.

The boss 6 is inserted into the spline 10 of the axle shaft 1, and the spline 16 is formed on the inner peripheral surface of the boss 6.
and the spline 16 are engaged with each other and are fixed relative to the rotational direction.

Further, after inserting the boss 6 into the axle shaft 1, the stop ring 15 is fitted into the axle shaft 1 and fixed so as not to move in the axial direction. The inner part of the outer peripheral surface of the boss 6 is configured as an inner race for the radial ball bearing 7. A spline 18 is formed at the front of the outer peripheral surface of the boss 6, and the spline 18 meshes with a spline 17 formed on the inner peripheral surface of the hub block 5.

A spline 14 is formed on the outer peripheral surface of the hub block 5 and is shorter than the length in the longitudinal direction of the hole 12 formed in the inner part of the flange 4. Further, the length in the longitudinal direction of the spline 14 of the hub block 5 is
It is preferable that the length in the longitudinal direction be approximately equal to the length in the longitudinal direction of the spline 13 formed on the inner peripheral surface of the flange 4, but the length is not limited thereto. Cap 8 is fixed to flange 4 by mounting bolts 9.

In a freewheel hub with such a structure, as shown in the upper half of Figure 1,
If the hub block 5 is inserted and installed into the boss 6 so that the spline 14 of the hub block 5 is at the back, the spline 14 of the hub block 5 will not engage with the spline 13 of the flange 4 and will be in a disengaged state, and the spline 14 of the hub block 5 will not engage with the spline 13 of the flange 4. Rotation is not transmitted to the hub 3.

Furthermore, as shown in the lower half of FIG.
meshes with the spline 13 of the
Rotation is now transmitted from the axle shaft 1 to the hub 3.

In other words, this freewheel hub can be connected or disconnected by simply inserting the hub block 5 into the boss 6 with the rear and front sides reversed, that is, in the opposite longitudinal direction. or a disengaged state.

The replacement procedure is to remove bolts 9, remove cap 8, pull out hub block 5, then turn hub block 5 over and attach boss 6 again.
and flange 4, and finally fix the cap 8 with bolts 9.

One embodiment of this invention has been described in detail,
It is not necessarily limited to these structures,
For example, the axle shaft 1 and the boss 6 can be manufactured integrally to further reduce the number of parts.
In addition, the cap 8 can be provided with an inspection window, or the cap 8 can be made of a transparent material.
It is also possible to configure the hub block 5 to have different colors on the front and back so that the condition of the freewheel hub can be known.

[Effect of idea]

As is clear from the above description, since the freewheel hub according to this invention is constructed as described above, the number of parts can be extremely small, and the manufacturing cost can be reduced. Furthermore, since it is a component that is easy to install and has a simple structure, it is extremely easy to handle because it does not use springs or the like to maintain engagement and is less likely to break down.

Further, unlike the conventional type, there is no need for space for the movement of the hub block for connection/disengagement, and there is almost no possibility that the hub block protrudes beyond the tire, which is extremely desirable from a safety standpoint.

Furthermore, if you use four-wheel drive only in winter, you can avoid forgetting to change the freewheel hub when changing to snow tires.

Furthermore, if tools and the like are required for the switching operation, simple switching due to mischief or the like will not be possible, and various effects such as being useful in preventing careless switching will be achieved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the freewheel hub according to this invention, Fig. 2 is a sectional view showing the freewheel hub shown in Fig. 1 without being attached, and Fig. 3 is a sectional view of a conventional automatic freewheel hub. FIG. 3 is a sectional view showing a freewheel hub. 1...Axle shaft, 3...Hub, 4...
Flange, 5...Hub block, 6...Boss, 1
3, 14, 17, 18...spline.

Claims (1)

[Scope of utility model registration request] a flange with a spline on its inner circumferential surface fixed to the hub; a boss fitted with a spline to the axle shaft; A freewheel hub having a hub block having a spline formed on a part of the outer peripheral surface in the longitudinal direction, which becomes an engaged state and becomes a disengaged state when inserted and installed in the opposite direction in the longitudinal direction.