JPH03277855A - Power transmission device - Google Patents

Abstract

PURPOSE:To secure the operation with the superior responsiveness by cutting off the driving connection between rotary shafts by the action between an electromagnetic brake and a cam means. CONSTITUTION:During the engagement state of a clutch means 9, the first and second rotary shafts 2; 3 and 4 are connected in driving-relation. When the driving connection of the rotary shafts is to be released in a moment in this state, an electromagnetic brake 36 is operated. Since the revolution of the rotary member 29 is suppressed by the operation of the electromagnetic brake, the turning phase of the pressing member 27 of the clutch is advanced in comparison with the revolution phase of the rotary member. Accordingly, a cam means 37 is operated to shift a pressing member 27 in the direction for reducing the energizing force. Accordingly, the engagement force of the clutch reduces, and the revolution shift of two rotary shafts 2; 3 and 4 is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power transmission device. In particular, the present invention relates to a power transmission device in which power transmission between two rotating shafts is controlled by a clutch.

[Prior art]

In a power transmission system for a part-time four-wheel drive vehicle, an input shaft driven by a prime mover and two output shafts are provided, and one output shaft, for example, the output shaft for driving the front axle, is always connected to the input shaft. The other output shaft, for example the output shaft for driving the rear axle, is connected to the input shaft via a clutch. When a part-time four-wheel drive vehicle equipped with such a power transmission device needs to brake while driving in four-wheel drive and the vehicle brakes are activated, in order to ensure that the anti-skid effect of the vehicle brakes is fully exerted, 2 temporarily at the moment a wheel skid is detected.
It is preferable to use wheel drive. In order to achieve this two-wheel drive state, it is necessary to release the clutch of the power transmission device, but if the clutch is a mechanical clutch such as a dog clutch, the clutch may be released or engaged momentarily. It is impossible to do so. Therefore, it is possible to use an electromagnetic clutch as the clutch, but when using an electromagnetic clutch, the electromagnetic solenoid of the clutch must be constantly energized while the clutch is engaged or disengaged, which reduces power consumption. This is not preferable from the viewpoint of durability of the clutch.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned problems in power transmission systems for part-time four-wheel drive vehicles, the present invention provides a power transmission system that can engage and disengage a clutch instantaneously and with relatively low operating energy. is the issue to be solved. The present invention also provides power transmission for a part-time four-wheel drive vehicle that can instantaneously switch from a four-wheel drive state to a two-wheel drive state when the anti-skid brake of the vehicle is activated, and that consumes less power for operation. Another problem to be solved is to provide a device.

[Means to solve the problem]

In order to solve the above problems, in the present invention, a clutch means is provided between two rotating shafts, and this clutch means is applied to the clutch means in an engaging direction via a pressing member that rotates as the clutch means rotates. The type is equipped with a biasing means that applies an elastic biasing force of . Furthermore, a rotating member is provided opposite the pressing member, and a cam means is disposed between the pressing member and the rotating member. This cam means acts to push the pressing member in the clutch release direction when the rotational phase of the pressing member is ahead of the rotational phase of the rotating member. The rotating member is provided with an electromagnetic brake means for suppressing rotation of the rotating member when electromagnetically excited, and the urging force of the urging means is reduced by the operation of the electromagnetic brake means via the cam means. Configure.

The invention further provides a power transmission system for a part-time four-wheel drive vehicle. This power transmission device includes an input shaft driven by a prime mover, a first output shaft drivingly connected to the input shaft, and a second output shaft connected to the input shaft via a main clutch means. Both the first and second output shafts are configured to be driven by the input shaft when the clutch means is engaged. A sub clutch means is provided between the main clutch means and the second output shaft. The sub-clutch means includes
A biasing means is provided for applying an elastic biasing force in the engaging direction to the sub-clutch means via a pressing member that rotates as the sub-clutch means rotates. A rotating member is arranged opposite to the pressing member, and a cam means is provided between the pressing member and the rotating member. The cam means is configured to push the pressing member in the clutch release direction when the rotational phase of the pressing member is ahead of the rotational phase of the rotating member. Further, the rotating member is provided with an electromagnetic brake means for suppressing rotation of the rotating member when electromagnetically excited, so that the activation of the electromagnetic brake means reduces the urging force of the urging means via the cam means. Configure.

[Effect]

According to the above configuration of the present invention, the eleventh and second rotating shafts are connected in a driving relationship when the clutch means is engaged. In this state, when it is desired to instantly release the driving connection of the rotating shaft, the electromagnetic brake is activated. Since the rotation of the rotating member is suppressed by the operation of the electromagnetic brake, the rotational phase of the pressing member of the clutch is in a state that is ahead of the rotational phase of the rotating member. Therefore, the cam means acts to displace the pressing member in a direction that reduces the biasing force. As a result, the engagement force of the clutch decreases, allowing the two rotating shafts to rotate relative to each other.

In the power transmission device for a part-time four-wheel drive vehicle according to the present invention, a two-wheel drive condition occurs when the main clutch means is disengaged, and a four-wheel drive condition occurs when the main clutch means and the auxiliary clutch means are engaged. Become. When the vehicle brakes are applied in a four-wheel drive state, the four-wheel drive state continues under normal brake operation without skid. If any wheel skids, the skid is electrically detected and electromagnetic brake means combined with the auxiliary clutch means is energized. As a result, the rotation of the rotating member is suppressed, and the rotational phase of the pressing member is in a state ahead of the rotational phase of the rotating member. Therefore, the cam means provided in the auxiliary clutch means is activated to displace the pressing member in the direction of decreasing the urging force. In this way, a two-wheel drive state is achieved. When the skid of the vehicle brakes disappears, the electromagnetic brake becomes de-energized again, the auxiliary clutch means is engaged, and the vehicle enters the four-wheel drive state.

According to the configuration of the power transmission device of the present invention, the rotation of the rotating member is suppressed by the operation of the electromagnetic brake, and the cam means is operated, and the urging force of the clutch means in the engaging direction is reduced by the action of the cam means. This makes it possible to release the clutch with less electric power than when the clutch means is released directly by electromagnetic force.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The power transmission device 1 shown in the figure has an input shaft 2, which is connected to a drive shaft of an engine-transmission unit of a vehicle, and two output shafts 3.4. The output shaft 3 is arranged parallel to the human power axis 2, and the output shaft 4 is arranged coaxially with the input shaft 2. The output shaft 3 is connected to the front axle, and the output shaft 4 is connected to the rear axle. The input shaft 2 is connected to a power transmission device l via a bearing 5.
It is rotatably supported by a housing 6. Output shaft 3
is rotatably supported by the housing 6 by bearings 8.9. The front end of the output shaft 4 is rotatably supported by the rear end of the input shaft 2 via a bearing 7. A sprocket 10 is rotatably supported on the output shaft 4 by a bearing 11. The sprocket 10 is connected to the input shaft 2 via a connecting member 12.
It is connected to the rear end of the

A sprocket 13 is formed on the output shaft 3, and this sprocket 13 is connected to a sprocket l-10 by a chain 14. Therefore, the output shaft 3 for front wheel drive is always connected to the drive shaft of the engine-transmission unit.

A sleeve 15 is fitted onto the output shaft 4, and this sleeve 15 engages with the output shaft 3 via a spline. The outer periphery of the sleeve 15 is supported by the rehousing 6 by a bearing 16.

A dog clutch 17 constituting a main latch means and a multi-disc clutch 18 constituting a sub-clutch means are provided between the sprocket 10 and the sleeve 15. The dog clutch 17 has a clutch member 19 formed at the rear end of the sprocket 10, and dog teeth are formed on the outer periphery of the clutch member 19. A bearing 2 is installed at the front end of the sleeve 15.
The cylindrical member 21 is rotatably supported via the cylindrical member 0 .

The front end of this cylindrical member 21 is located adjacent to the clutch member 19, and dog teeth are formed on the outer periphery coaxially with the dog teeth of the clutch member, thereby forming the other clutch member of the dog clutch.

A dog sleeve 22 is provided to connect dog teeth formed at the rear end of the sleeve 10 and dog teeth formed at the front end of the cylindrical member 21. This dog sleeve 22 is supported by dog teeth on the sleeve 10 so as to be freely slidable in the axial direction. When the dog sleeve 22 is in the position shown in the figure, the dog clutch is in an engaged state, and the sleeve 10 and the cylindrical member 21 are drivingly connected. When the dog sleeve 22 moves leftward in the figure and is disengaged from the dog teeth of the cylindrical member 21, the dog clutch 17 is released.

A shifter 23 is provided to move the dog sleeve 22 between the clutch engagement position shown in the figure and a clutch non-engagement position moved to the left from the illustrated position. The dog sleeve 22 has a circumferential groove 22a on the outer periphery, and the shifter 22a
The engaging claw 23a is slidably engaged with this groove. The shifter 23 is fixed to the shaft 25 by a bolt 24, and
5 is supported on the housing 6 so as to be movable in the axial direction. Therefore, by moving this shaft 25 in the axial direction from an external operating mechanism, the dog sleeve 22 can be operated via the shifter 22a.

A large-diameter cylindrical portion 21a is formed at the rear of the cylindrical member 21, and this large-diameter cylindrical portion 21a constitutes one clutch member of the multi-plate clutch 18. A circular flange 15 a is formed on the sleeve 15 at a position radially inward from the large-diameter cylindrical portion 21 a of the cylindrical member 21 , and this circular flange 15 a constitutes the other clutch member of the multi-disc clutch 18 . The large-diameter cylindrical portion 21a and the circular flange 15a of the cylindrical member 21 support a large number of clutch friction plates so as to be able to slide in the axial direction.
The friction plates supported by 1a and the friction plates supported by flange 15a are arranged alternately. In the figure, these friction plates are shown with the same reference numeral 26.

A pressing member 27 is provided to urge the friction plates 26 in a direction to engage each other. A disc spring 28 is attached to the pressing member 27.
are engaged, and the pressing member 27 is always urged toward the friction plate 27. A rotating member 29 is arranged on the sleeve 15 at a position radially inward of the pressing member 27. This rotating member 29 is rotatably supported on the sleeve 15 by a bearing 30. A circular flange member 31 is provided on the rotating member 29 so as to rotate together with the rotating member 29 . A ring-shaped brake member 32 is fixed to the housing 6 at a position radially outward of the rotating member 29. The brake member 32 and the flange member 31 support a large number of brake friction plates 33 slidably in the axial direction. The friction plates supported by the brake member 32 and the friction plates supported by the flange member 31 are arranged alternately.

A reaction ring 34 is supported by the brake member 32 on one side of the friction plate 33, and a pressure ring 3 is supported on the opposite side.
5 is supported. An electromagnetic solenoid 36 is provided to bias the pressure ring 35 toward the friction plate 33 to engage the brake. When the electromagnetic solenoid 36 is de-energized, no biasing force acts on the friction plate, and the flange member and rotating member 29 can freely rotate relative to the brake member 32. When the electromagnetic solenoid 36 is excited, the press ring 35 is urged toward the friction plate 33, causing the friction plate supported by the brake member 32 and the friction plate supported by the flange member 31 to frictionally engage with each other. As a result, a braking force acts on the rotating member 29.

The pressing member 27 and the rotating member 29 of the multi-disc clutch 18 each have radial wall portions 27a and 29a facing each other in the axial direction, and these radial walls aB27a and 29a have cam recesses 27b and 29b at positions facing each other. It is formed. A cam ball 3 is located between the cam recesses 27b and 29b.
7 is placed. When the rotating member 29 is not receiving a braking force, the cam ball 37 is in a sunken state in the recesses 27b, 29b, and the pressing member 27 is biased toward the friction plate by the action of the disc spring 28. Therefore, the multi-disc clutch 18 is maintained in an engaged state. Electromagnetic solenoid 3
6 is excited and a braking force is applied to the rotating member 29, the rotation of the rotating member 29 tends to lag behind the rotation of the pressing member 27.

Therefore, the rotational phase of the pressing member 27 is advanced than the rotational phase of the rotating member 29, and the cam ball 37 rides on the edges of the recesses 27b and 29b. As a result, the pressing member 27 is displaced to the right in the figure against the action of the disc spring 28, and the biasing force acting on the friction plate 26 is reduced.

The operation of the dog transmission device 1 having the structure described above will be explained as follows.

First, in order to obtain a two-wheel drive state, the dog clutch 17
Release. To do this, the shifter 23 is operated to move the dog sleeve 22 leftward from the position shown in the figure to disengage it from the dog teeth of the cylindrical member 21.

For four-wheel drive, reverse the operation to set dog clutch 1.
7. At this time, there is no need to energize the electromagnetic solenoid 36, and no power is consumed. Multi-plate clutch 18
are maintained in the engaged state by the action of the disc spring 28.

Even when the vehicle brakes are applied in a four-wheel drive state, this state is maintained under normal brake operation. When a skid occurs on any wheel during vehicle braking, the electromagnetic solenoid 36 is energized. Due to the excitation of this electromagnetic solenoid 36, the press ring 35 moves against the friction plate 33.
, and a braking force acts on the rotating member 29.

As a result, as described above, the biasing force applied to the multi-plate clutch 18 is reduced, and the output shaft 4 for driving the rear axle is reduced.
The drive connection between the input shaft 2 and the input shaft 2 is cut off, and a two-wheel drive state is maintained. When the skid is eliminated, the excitation of the electromagnetic solenoid 36 is cut off, and the four-wheel drive state is resumed.

〔effect〕

As described above, in the present invention, the drive coupling between the rotating shafts is broken by the action of the electromagnetic brake and the cam means, so highly responsive operation can be obtained, and less power is required for operation. I'm done. In addition, part-time 4 of the present invention
According to the power transmission device for a wheel drive vehicle, when the vehicle brake is activated in a four-wheel drive state, it is possible to quickly obtain a temporary two-wheel drive state in response to skid detection.

[Brief explanation of the drawing]

The figure is a cross-sectional view of a power transmission device for a part-time four-wheel drive vehicle, showing one embodiment of the present invention. 2...Input shaft, 3.4...Output shaft, 10.13
...Sprocket, 14...Chain, 17.
...Dog clutch, 18...Multi-plate clutch, 2
7... Pressing member, 29... Rotating member, 33...
...Friction plate, 35...Press ring, 36...Electromagnetic solenoid, 37...Cam ball.

Claims (2)

[Claims] (1) A first rotating shaft, a second rotating shaft, a clutch means provided between the first and second rotating shafts, and a pressing member that rotates as the clutch means rotates, and the clutch means and a biasing means that applies an elastic biasing force in the engagement direction to the clutch means, and in which power is transmitted between the two rotating shafts when the clutch means is engaged, a rotating member disposed, a cam means provided between the pressing member and the rotating member, and pushing the pressing member in a clutch release direction when the rotational phase of the pressing member advances than the rotational phase of the rotating member; and an electromagnetic brake means for suppressing rotation of the rotating member when electromagnetically excited, and the urging force of the urging means is reduced by the operation of the electromagnetic brake means via the cam means. A power transmission device characterized by: (2) An input shaft driven by a prime mover, a first output shaft drivingly connected to the input shaft, and a second output shaft connected to the input shaft via a main clutch means, the main clutch When the means is engaged, the input shaft causes the first and second
In a power transmission device for a part-time four-wheel drive vehicle in which both output shafts are driven, a sub clutch means is provided between the main clutch means and the second output shaft, and a rotation of the sub clutch means is provided. a biasing means that applies an elastic biasing force in the engaging direction to the sub-clutch means via a pressing member that rotates with the rotation of the clutch; a rotating member disposed opposite to the pressing member; cam means provided between the rotating member and pushing the pressing member in the clutch release direction when the rotational phase of the pressing member advances than the rotational phase of the rotating member; and cam means that rotates the rotating member when electromagnetically excited. 1. An electromagnetic brake means for suppressing the vibration, and the urging force of the urging means is reduced by the operation of the electromagnetic brake means via the cam means.