JP2521978B2 - Remote type freewheel hub device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freewheel hub device for remotely engaging and disengaging a freewheel hub, and more particularly, when the remote device of the freewheel hub fails, the hub device is manually operated. The present invention relates to a freewheel hub device that can be engaged and disengaged.

(Prior Art) As a remote type free wheel hub device of this type, a device for engaging and disengaging a hub clutch using an electromagnet, such as the one described in JP-A-60-12336, is conventionally used. There has been a hydraulic type or negative pressure type in which the clutch is disengaged by pressure or the like to electrically assist the operation.

For example, as shown in FIG. 6, the conventional remote type freewheel hub device described in the above-mentioned Japanese Patent Laid-Open No. 60-12336 is mounted slidably and integrally with a drive shaft 22 '. The permanent magnet 30 fixed to the inner sleeve 6'is repelled or attracted to the electromagnet 40 by turning on and off the electromagnet 40 attached to the casing side, whereby the inner sleeve 6'slides to slide on the wheel hub. It was disengaged from the driven gear 7'fixed to the vehicle to switch between two-wheel drive and four-wheel drive.

(Problems to be Solved by the Invention) However, in the conventional remote type free wheel hub device as described above, when the operation source such as electric or hydraulic pressure fails for some reason, it is no longer possible to use two-wheel drive and four-wheel drive. It was not possible to switch to wheel drive, which was extremely dangerous, especially on snowy roads.

Further, the applicant of the present invention has previously proposed a freewheel hub device capable of switching between two-wheel drive and four-wheel drive as shown in FIG. 7 in two ways: a manual type and a remote control type by a motor 16. ing. In this freewheel hub device, the rotational force from the motor 16 is transmitted to the handle 12 via the pinion gear 15 and the gear 25 ', and the cam follower 10 is biased by the cam surface 12b formed on the outer peripheral surface of the handle 12. As a result, the clutch ring 7 is slid to engage with the inner sleeve 6, that is, the drive shaft 22 and the wheel hub 22 are connected. A knob 12c is formed on the handle 12, and by manually rotating the knob 12c, it is possible to manually switch between two-wheel drive and four-wheel drive.

However, also in the remote freewheel hub device by the applicant, since the gear 25 'is integrally attached to the handle 12, if the power supply or the motor 16 fails, the handle 12 is locked by the pinion gear 15 and manually operated. There was a fear that switching by would not be possible.

The present invention has been made in order to solve the above-mentioned problems in the remote type freewheel hub as described above, and even when the switching drive source of the freewheel hub fails. An object of the present invention is to provide a remote type freewheel hub device that can easily and smoothly perform drive switching.

(Means for Solving the Problems) In order to achieve the above object, the present invention disengages the inner sleeve that rotates integrally with the axle by sliding the clutch ring that rotates integrally with the wheel hub in the axial direction. In a freewheel hub device for switching between two-wheel drive and four-wheel drive, a handle having a manual knob rotatably attached to the wheel hub, and a handle interposed between the handle and the clutch ring. An operating member for engaging and disengaging the clutch ring with the inner sleeve as the handle rotates, a motor for rotating the handle via the gear member, and a one-way clutch interposed between the gear member and the handle. It is characterized by having.

As a second aspect of the present invention, the handle is
It is divided into a handle portion having a knob and a sleeve portion provided with an operating member for engaging and disengaging the clutch ring,
Provided is a remote freewheel hub device in which a one-way clutch for transmitting a rotational force from the handle portion to the sleeve portion is interposed between the handle portion and the sleeve portion.

(Operation) In the remote freewheel hub device according to the present invention described above, when the drive is switched between the two-wheel drive and the four-wheel drive by remote control, the handle is rotated by the motor through the gear member (for example, from the two-wheel drive). (Normal rotation when switching to four-wheel drive, reverse rotation when the other way)
Then, the clutch ring and the inner sleeve are engaged and disengaged by the operating member. At this time, the rotational force is transmitted from the gear member to the handle by the one-way clutch interposed therebetween.

When the drive is switched manually, the knob of the handle is grasped and the handle is rotated to engage and disengage the clutch ring and the inner sleeve by the operating member. At this time, the handle becomes free with respect to the gear member by the action of the one-way clutch between them, and the rotational force of the handle manually is not transmitted to the gear member side. Therefore, the manual drive switching of the freewheel hub is not hindered by the locking of the gear member.

Further, according to the second aspect of the present invention, during remote control, the sleeve portion of the handle is rotated by the rotational force from the motor to switch the drive of the freewheel hub, but the handle portion is provided between the sleeve portion and the sleeve portion. The inserted one-way clutch prevents the sleeve from rotating because it is free from the sleeve. Therefore, less power is required for the handle portion.

In the case of manual switching, the rotational force of the handle portion is manually transmitted to the sleeve portion via the one-way clutch, but not to the gear member side as in the above case.

(Embodiment) The present invention will be described in more detail based on an embodiment shown in the drawings.

FIG. 1 shows an embodiment of a remote type free wheel hub device according to the present invention, in which a cylindrical body 1 is attached to an outer end portion of a wheel hub 23 rotatably mounted on an outer end portion of an axle tube 21. Is fixed, the ring 4 is locked in the body 1 by the plate 9 and the snap ring 5, and the inner sleeve 6 rotating integrally with the axle 22 is rotatably supported by the ring 4. The handle 12 is a cover 2 attached to the body 1.
It is rotatably supported by. Boss part of this handle 12
A cam surface 12b as shown in FIG. 2 is formed on the circumference of 12a. A cam follower 10 is incorporated on the outer periphery of the handle boss portion 12a, and its claw portion 10a is in contact with the cam surface 12b. The clutch ring 7 is in contact with the cam follower 10. The clutch ring 7 is axially slidably mounted between its outer peripheral surface and the inner peripheral surface of the body 1. Clutch ring 7 and cam follower 10, and cam follower 10
Springs 11 and 13 are provided between and the handle 12, respectively. Splines 7a, 6a capable of meshing with each other are provided on the inner peripheral surface of the clutch ring 7 and the outer peripheral surface of the inner sleeve 6, respectively. A motor 16 having a shaft 16a is fixed in a side wall of a wheel hub 23 of the body 1, and a pinion gear 15 is fitted to the shaft 16a.

A gear 25 is fitted to the boss 12a of the handle 12 via a one-way clutch 24, and the gear 25 is meshed with the pinion gear 15. This one way clutch 24
When the rotational force is transmitted from the gear 25 to the handle 12, the handle 12 is rotated integrally with the gear 25, but the rotational force is not transmitted from the handle 12 to the gear 25 and the handle 12 is free. It is of a type that allows it to rotate.

Further, the handle 12 is formed with a knob 12c for manually rotating the handle 12.

A brush 24 connected to the motor 16 is attached to the wheel hub 23, a lock plate 18 of a bearing 25 is attached to the axle tube 21, and a slip ring portion 18a for conducting a current to the motor 16 is attached to the lock plate 18. Is installed. The slip ring portion 18a is wired so as to be connected to a control box (not shown) inside the vehicle through the inside of the axle pipe 21. The control box is connected to a power battery and a switch on the driver's seat, and this switch is a three-point control for forward rotation, reverse rotation, and neutral.

When the switch 21 is put in the forward rotation side from the state where the clutch ring 7 in FIG. 1 is disengaged from the inner sleeve 6, the motor 16 is energized via the slip ring portion 18a, the shaft 16a is rotated forward, and the shaft 16a is rotated. The pinion gear 15 fitted in the positive rotation makes a forward rotation of the gear 25 meshing with the pinion gear 15. The rotational force of the gear 25 is transmitted to the handle 12 via the one-way clutch 24, and the handle 12 rotates integrally with the gear 25, whereby the claw portion 10a of the cam follower 10 moves along the cam surface 12b (see FIG. 1). Move left and come to the position indicated by the solid line in Figure 2). Therefore, the clutch ring 7 also moves in the same direction and engages with the inner sleeve 6, the axle 22 and the wheel hub 23 are connected, and the four wheels can be driven.

When the clutch ring 7 and the inner sleeve 6 are engaged, the slip ring portion
The shaft 16a is reversely rotated by energizing the motor 16 via 18a, and this rotating force reversely rotates the handle 12b via the pinion gear 15, the gear 25 and the one-way clutch 24 as in the case of the forward rotation. The pawl portion 10a of the cam follower 10 tries to move axially (to the right in FIG. 1) along the cam surface 12b of the handle by the spring 11, but the frictional force due to the torque between the clutch ring 7 and the inner sleeve 6 is generated. Occurs, and stops in a state of balance with the spring 13.

After that, when the vehicle moves and mutual rotation occurs between the axle 22 and the wheel hub 23, mutual rotation also occurs between the inner sleeve 6 and the clutch ring 7, thereby eliminating the frictional force between them. The spring 13 moves the clutch ring 7 in the axial direction (to the right in FIG. 1), disengages from the inner sleeve 6, and the two wheels become free to be in a two-wheel drive state.

By setting the switch to the neutral position, the motor 16 is de-energized, and the state of being set to either four-wheel drive or two-wheel drive is maintained.

In the above remote type freewheel hub, the motor
16, the connection between the motor 16 and the power battery (eg brush
If it becomes impossible to switch between two-wheel drive and four-wheel drive by remote control by the motor 16 due to a failure of the connection between 24 and the slip ring part 18a), manually grasp the knob 12c of the handle 12 and manually Handle 12
Rotate forward or reverse. This allows the motor 16
Cam surface 12b as in the case of remote control by
The inner sleeve 6 and the clutch ring 7 are disengaged from each other by the relative movement of the cam follower 10a and the cam follower 10a.

At this time, the rotational force of the handle 12 manually is not transmitted to the gear 25 side by the action of the one-way clutch 24, so the handle 12 is free to the gear 25 and the motor 16, and is locked by the remote control drive unit. Therefore, the manual drive switching of the freewheel hub is not hindered.

FIG. 3 shows another embodiment of the present invention,
The handle 112 is further divided into a sleeve portion 112A having a cam surface 112a on the outer peripheral portion and a handle portion 112B having a knob 112b, and the other parts are the same as those in the embodiment of FIG. The same reference numerals are given.

The sleeve 112A and the handle 112B of this handle 112
Between the sleeve part and the handle part 112B
When the handle portion 112B rotates by transmitting only in the direction of 112A, the sleeve portion 112A is integrally rotated.
A one-way clutch 124 of a type that keeps the handle portion 112B from rotating when 112A rotates is interposed.

In the freewheel hub device of FIG. 3, the forward or reverse rotational force of the motor 16 is transmitted to the sleeve portion 112A via the pinion gear 15, the gear 25 and the one-way clutch 24,
Cam surface 112a and cam follower accompanying rotation of sleeve 112A
By relative movement with respect to 10, drive switching between two-wheel drive and four-wheel drive is performed as in the above-described embodiment.

At this time, the one-way clutch 124 does not transmit the rotational force from the motor 16 from the sleeve portion 112A to the handle portion 112B, and the handle portion 112B is in a free state. Therefore, the power of the motor 16 required for drive switching is smaller than that of the embodiment of FIG. 1 by the amount that the handle portion 112B is not rotated, which reduces the consumption of battery power.

In this remote type freewheel hub, the motor
When it becomes impossible to switch between two-wheel drive and four-wheel drive by remote control by the motor 16 due to a failure in the connection between the motor 16 and the motor 16 and the power battery, hold the knob 112C of the handle 112B with your hand. The handle 112B is manually rotated in the forward or reverse direction.

The one-way clutch 124 rotates the handle 112B.
Is transmitted to the sleeve portion 112A via the
The rotation of 2A switches between two-wheel drive and four-wheel drive as in the case of remote control switching. At this time, the sleeve portion 112A is in a free state with respect to the gear 25 by the action of the one-way clutch 124, and therefore manual drive switching of the freewheel hub is not hindered by the lock by the gear 25 and the pinion gear 15.

In addition to the above embodiment, a one-way clutch 22 of a type that allows relative rotation of the handle 12 with respect to the gear 25 only in one direction (reverse rotation direction) as shown in FIG.
4 is interposed between the gear 25 and the handle 12 ', and the handle 1
The cam surface formed on the outer peripheral surface of 2'is formed by a slope 12'α for engaging the inner sleeve 6 and the clutch ring 7 and a slope 12'β for releasing the engagement as shown in FIG. There is an embodiment in which the cam surface 12'b is formed by continuously forming and.

In this embodiment, when the motor 16 is rotated in the normal direction, the one-way clutch 224 works to operate the gear 25 and the steering wheel 1.
2'is integrally rotated, and the claw portion 10a of the cam follower 10 slides alternately on the engaging side slope 12'α and the releasing side slope 12'β of the cam surface 12'b as the handle 12 'rotates. ，
As a result, engagement / disengagement of the inner sleeve 6 and the clutch ring 7 is alternately performed, and switching from two-wheel drive to four-wheel drive or four-wheel drive to two-wheel drive is alternately performed.

Therefore, in this embodiment, since the freewheel hub can be continuously switched only by driving the motor 16 in one direction (forward rotation direction), the rotation direction of the motor can be changed as in the above two embodiments. No need to switch.

If the remote control unit such as the motor 16 fails, hold the knob 12'c and manually operate the handle 1
Rotate 2'in the opposite direction. As a result, the claw portion 10a of the cam follower is moved relative to the cam surface 12'b in the opposite direction to the above, and the free wheel hub is switched. At this time, the handle 12 'rotates in the reverse direction with respect to the gear 25,
Since the one-way clutch 224 operates so that the gear 25 is in a free state, the gear 25 is not locked to prevent manual switching of the freewheel hub.

(Effects of the Invention) As described above, according to the present invention, the rotational force from the gear member is provided between the gear member for transmitting the rotational force from the motor and the manually rotatable handle for switching the drive of the freewheel hub. Is transmitted to the steering wheel, but the torque is not transmitted from the steering wheel to the gear member, and the handle is free from the gear member. In addition, when the drive of the freewheel hub is manually switched by manually rotating the handle, the handle is in a free state with respect to the gear member, so this manual switching is performed by locking the gear member or the like. There is no danger of being hindered.

[Brief description of drawings]

1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a view showing a cam surface in the same embodiment, FIG. 3 is a side sectional view showing another embodiment of the present invention, and FIG. Is a side sectional view showing still another embodiment of the present invention, FIG. 5 is a side sectional view showing a cam surface in the embodiment of FIG. 4, FIG. 6 is a side sectional view showing a conventional example,
FIG. 7 is a side sectional view of the device previously invented by the applicant of the present invention. 6 ... Inner sleeve, 7 ... Clutch ring, 10 ... Cam follower, 12,112, 12 '... Handle, 12b, 112b, 12'b ... Cam surface, 12c, 112c, 12'c ... Knob, 15 ... … Pinion gear, 16 …… motor, 24,224 …… one way clutch, 25 …… gear, 112A …… sleeve part, 112B …… handle part.

Claims (2)

(57) [Claims] 1. A freewheel hub device for switching between two-wheel drive and four-wheel drive by axially sliding a clutch ring that rotates integrally with a wheel hub with respect to an inner sleeve that rotates integrally with an axle, thereby engaging and disengaging the clutch ring. ，
A handle which is rotatably attached to the wheel hub and has a knob for manual operation, and which is interposed between the handle and the clutch ring and disengages the clutch ring from the inner sleeve as the handle rotates. A remote type freewheel hub device comprising: an operating member, a motor for rotating a handle via a gear member, and a one-way clutch interposed between the gear member and the handle. 2. The handle is divided into a handle portion having a knob and a sleeve portion provided with an actuating member for engaging and disengaging the clutch ring, and the handle portion and the sleeve portion are disposed between the handle portion and the sleeve portion. The remote type freewheel hub device according to claim 1, further comprising a one-way clutch for transmitting the rotational force only to the portion.