JPH04126635A - Free wheel hub device - Google Patents

Abstract

PURPOSE:To switch clutch mechanism automatically to a free state by providing an independent power plant to supply electricity to an electrical actuator so as the clutch mechanism will actuate in a free state resisting the action of a spring means while electricity is generated in response to the rotation of a wheel hub. CONSTITUTION:When a wheel hub 16 rotates, generation of electricity at a magneto coil 25 increases in response to the increase of the rotational speed of the wheel hub 25, that is, the engine speed, and the starting torque of an electric motor 24 increases. When the engine exceeds a second established engine speed, a spline 27a of an outerclutch 27 disengages from a spline 32a of an inner clutch 32. On the other hand, when the engine speed drops to a first established engine speed from the speed exceeding the second established engine speed, the starting torque of the electric motor 24 drops and coincides with the action of a spiral spring 47 and a compression coil spring 44. When the engine speed further drops, a driven gear 48 and a rotation cam 41 are rotated toward a restoring state causing the spline 27a of the outer clutch 27 to engage with the spline 32a of the inner clutch 32.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a freewheel hub device that is attached to a wheel that is switched between driving and non-driving in, for example, a part-time four-wheel drive vehicle.

[Conventional technology]

As a type of freewheel hub device, power transmission between the axle and the wheel hub is interrupted by switching a clutch mechanism provided between the axle and the wheel hub to a free state or a locked state using an electric actuator. is proposed, for example, in Japanese Utility Model Application Publication No. 64-52940.

[Problem to be solved by the invention]

In the conventional freewheel hub device described above, the operation of the electric actuator is controlled by operating a switch installed in the driver's seat, and the clutch mechanism must be manually switched to the free state or the open state. This requires manual operation, and it is not always possible to cut off unnecessary power transmission when the vehicle is traveling at high speeds higher than the set vehicle speed. The present invention has been made to address the above-mentioned problems, and provides a freewheel hub device that can automatically switch a clutch mechanism to a free state without requiring manual operation when the vehicle is running at a high speed higher than a set vehicle speed. The purpose is to

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a clutch mechanism provided between the axle and the wheel hub that is actuated by an electric actuator to intermittent power transmission between the axle and the wheel hub. In the wheel hub device, a spring means is provided for urging the clutch mechanism into a locked state, and the clutch mechanism is operated in a free state against the action of the spring means by generating electricity according to the rotation of the wheel hub. In order to do so, a private power generator was installed to supply electricity to the electric actuator.

[Effect]

In the freewheel hub device according to the present invention, the private power generation device generates power according to the rotation of the wheel hub, that is, the vehicle speed, and when the vehicle speed exceeds the set vehicle speed, the driving force of the electric actuator exceeds the acting force of the spring means. The clutch mechanism in the locked state is automatically switched to the free state, and when the vehicle speed drops below the set speed, the driving force by the electric actuator becomes less than the acting force by the spring means, and the clutch mechanism in the free state is automatically switched to the locked state. It will be done.

【Example】

An embodiment of the present invention will be described below based on the drawings. FIG. 1 shows a freewheel hub device t according to the present invention, which is assembled to, for example, a front wheel hub of a four-wheel drive vehicle, and is operated by a transfer device (two-wheel/four-wheel switching device), not shown. The axle 11, which can be switched between driving and non-driving, is turned on. A wheel hub 16 is mounted on a cylindrical spindle 13 which rotatably supports the wheel hub 12 via bearings 14 and 15.
(wheels not shown) are rotatably assembled, and a lock nut 17 is screwed and fixed, and a magnet 18 is fixed to the outer end of the lock nut 17. Further, a body 21 and a cover 2 are provided at the outer end of the wheel hub 16.
2 is fixed with a bolt 23. The body 21 is formed into a cylindrical shape, and an electric motor 24 with a speed reducer and a power generation coil 25 are assembled inside the body 21, and a ring bearing 26 and a seven-ring outer clutch 27 are assembled therein.
is assembled. The generator coil 25 is connected to the magnet 18
The magnet 18 is arranged close to the electric motor 24 and is connected to the electric motor 24, and together with the magnet 18 constitutes a private power generation device that supplies electricity to the electric motor 24. In addition, electricity supply! (The value of the current generated in the generator coil 25) increases in proportion to the relative rotational speed of the magnet 18 and the generator coil 25, that is, the vehicle speed increases. The ring bearing 26 is attached so as not to be movable in the axial direction by a snap ring 31 attached to the body 21, and carries a cylindrical inner clutch 32 that is spline-coupled onto the outer end protrusion of the axle 11 and rotates integrally with the ring bearing 26. It is rotatably supported. The inner clutch 32 has splines 32 on its outer periphery.
a snap ring 3 assembled to the axle 11
3, a snap ring 34 and a plate 35 assembled to open the ring bearing 26, making it impossible to move in the axial direction. The outer clutch 27 is spline-coupled to the body 21 at its outer periphery so as to be movable in the axial direction, and rotates integrally with the body 21. Cam follower 42. It is moved in the axial direction by the cooperative action of the tension coil spring 43, compression coil spring 44, etc., and engages the spline 32a of the inner clutch 32 at the spline 27a formed on its inner circumference (the four locks shown in the lower half of FIG. 1). state) and detachment (see free state shown in the upper half of Figure 1). The rotary cam 4] has a cam surface 41a that engages with the pawl 42a of the cam follower 42, and
Plate j5 A, = 45 B on a. The clutch mechanism consisting of the outer clutch 27 and the inner clutch 32 is assembled using a snap ring 46 so as to be immovable and rotatable in the axial direction, and a spiral spring 47 provided between the boss portion 22a of the cover 22 creates a clutch mechanism consisting of the outer clutch 27 and the inner clutch 32 as shown in FIG. It is urged to rotate to the locked state shown in the lower half. The cam follower 42 is spline-coupled to the body 21 at its outer periphery so as to rotate integrally with the body 21, is elastically coupled to the outer clutch 27 via a tension coil spring 43, and is connected to the driven gear 48.
Together with the outer clutch 27, it is biased to the left in the figure by a compressed fill spring 44 provided therebetween. The driven gear 48 is integrally and rotatably assembled on the rotating cam 4], and a pinion 49 is integrally and rotatably assembled on the output shaft 248 of the electric motor 24 to form the clutch mechanism described above, as shown in the upper half of FIG. It is designed to be rotated so as to be in a free state. In this embodiment configured as described above, the wheel hub 1
6, no current flows through the generator coil 25 and the starting torque of the electric motor 24 is zero. Therefore, the rotating cam 41 is held in the restored state by the action of the spiral spring 47, and the spline 27a of the outer clutch 27 is engaged with the spline 32a of the inner clutch 32 as shown in the lower half of FIG. In other words, the clutch mechanism is held in a locked state. Thus, when the wheel hub 16 rotates, the current generated in the power generation filter 25 increases in accordance with an increase in its rotational speed, that is, the vehicle speed, and the starting torque of the electric motor 24 increases in proportion to the increase in vehicle speed. (Then, the vehicle speed or the first set vehicle speed■
1, the starting torque of the electric motor 24 matches the mounting loads of the spiral spring 47 and the compression fill spring 44, and when the vehicle speed increases further, the starting torque of the electric motor 24 causes the driven gear 48. Although the rotating cam 41 is rotated, the driven gear 48. In addition to the acting forces of the spiral spring 47 and the compression fill spring 44, a frictional resistance force generated between the spline 27a of the outer clutch 27 and the spline 32a of the inner clutch 32 acts on the rotating cam 41, and the vehicle speed is adjusted to the second set vehicle speed. V2 (approximately 80 Km/
spline 27 of the outer clutch 27 until reaching H)
The engagement between the spline 32a of the inner clutch 32 and the spline 32a of the inner clutch 32 is maintained. By the way, when the vehicle speed exceeds the second set vehicle speed v2, γ
Utakura, Chi 27 has been moved to the right in Figure 1, and
As shown in the upper half of the figure, the spline 27a of the outer clutch 27 is disengaged from the spline 32a of the inner clutch 32, that is, the clutch mechanism is automatically switched from the locked state to the free state (see FIG. 2). Therefore, in such a case, if the axle 11 is set to a non-driving state by a transfer device (not shown), the axle 11 can be stopped, and the power loss required for rotationally driving the drive system including the axle 11 can be eliminated. In addition to improving fuel efficiency, it is also possible to prevent noise from being generated due to the rotational drive of the drive system including the axle 11. On the other hand, when the vehicle speed decreases from the second set vehicle speed v2 or higher to the first set vehicle speed ■1, the starting torque of the electric motor 24 decreases and becomes equal to the acting force of the spiral spring 47 and the compression coil spring 44. When the vehicle speed decreases, the spiral spring 4
7 and the compression coil spring 44 overcome the starting torque of the electric motor 24, and the driven gear 48. The rotating cam 41 is rotated toward the return state, and the outer clutch 27 is moved to the left in FIG. (The engaged state, that is, the clutch mechanism is automatically switched from the free state to the locked state (see Fig. 2). 1. In the above embodiment, the outer clutch 27 is As an electric actuator that moves to the right in Figure 1 against the
Electric motor 24. Although an electric actuator consisting of a pinion 49, a driven gear 481, a rotating cam 4], a cam follower 42, etc. was used, the present invention adopts an electromagnetic solenoid mechanism that moves the outer clutch 27 to the right in FIG. 1 when energized as the electric actuator. It is also possible to implement Further, in the above embodiment, the present invention was implemented by disposing the magnet on the non-rotating side and the generating coil on the rotating side, but the generating coil was disposed on the non-rotating side and the magnet was disposed on the rotating side. It is also possible to implement the present invention by setting the following.

【Effect of the invention】

The freewheel hub device according to the present invention requires no manual operation at all and is extremely easy to use. ■When the vehicle speed exceeds the set vehicle speed (for example, the second set vehicle speed V2 in the above embodiment), the clutch mechanism is always switched to the free state, so when the axle is in the non-drive state and the vehicle is traveling at high speed, The axle can be stopped, and the power loss required for the rotational drive of the drive system including the axle can be eliminated, thereby improving fuel efficiency, and the generation of noise due to the rotation of the drive system including the axle can be prevented. be able to. ■Since the on-board battery is not used as a power source for the electric actuator, there is no effect on the on-board battery. You can obtain the following effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a freewheel hub device according to the present invention, and FIG. 2 is an explanatory diagram showing switching timing of the freewheel hub device. Explanation of symbols 11...Axle, 16...Wheel hub, 18...
Magnet, 24... Electric motor, 25... Power generation filter,
27... Outer clutch, 32... Inner clutch, 41... Rotating cam, 42... Cam follower, 47
...Spiral spring, 48...Driven gear, 49...
pinion. Applicant Ainon Seiki Co., Ltd. Agent Patent Attorney Teru Hase - (1 other person)

Claims (1)

[Claims] In a freewheel hub device in which power transmission between an axle and a wheel hub is interrupted by operating a clutch mechanism provided between an axle and a wheel hub using an electric actuator, the clutch mechanism is biased to a locked state. and a private power generating device that supplies electricity to the electric actuator in order to generate electricity according to the rotation of the wheel hub and operate the clutch mechanism in a free state against the action of the spring means. A freewheel hub device characterized by: