JPS61112827A - Clutch device - Google Patents

Abstract

PURPOSE:To provide a clutch device which may be smoothly engaged upon rotation, by constituting the clutch device with a cam means between a clutch ring and a cam ring, and a bias means disposed between the cam ring and an input shaft. CONSTITUTION:A clutch means 11 and a cam means 15 are disposed between a chain wheel 5 and a clutch ring 9, and between the clutch ring 9 and a cam ring 13, respectively. A leaf spring 19 as a bias means is disposed in the gap 17 between the cam ring 13 and the inner race of a bearing 3, and the cam ring 13 is urged in the thrust direction toward the cam means. Accordingly, the cam means is exerted with a pressing force in the thrust direction to the chain wheel 5, and therefore, the input shaft is smoothly engaged with the rotary member even upon rotation by moving the clutch ring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a clutch device used for switching between two wheels and four wheels of a four-wheel drive vehicle.

[Technical background and problems] Conventional clutch devices of this type include, for example, the one described in Jidosha Engineering, January 1981 issue, page 72 (Published by Railway Japan Co., Ltd. on January 1, 1981). There is something.

This shows a transfer device, in which spline parts are formed on both the input shaft side and the chain wheel as a rotating body on the output side, and a sleeve for switching between 2 wheels and 4 wheels connects and disconnects the two. In this way, power transmission from the input shaft to the rotating body is interrupted. Therefore, a synchronizing mechanism is required to synchronize the input side and the rotary body side during switching connection while the vehicle is running.

However, as a device for this purpose, an inertia lock type synchronizing mechanism that is generally used in transmissions has been applied, but for example, it is used as a synchronizing part for switching between 2 wheels and 4 wheels of a 4-wheel drive vehicle. , differential gear, propeller shaft, and axle shaft, so the synchronizer capacity was insufficient and there was a risk of seizure.

[Object of the Invention] The present invention was devised in view of the above-mentioned problems, and an object of the present invention is to provide a clutch device that can obtain smooth connection during rotation without requiring a synchro line groove.

[Structure of the Invention] In order to achieve the above object, the present invention includes an input shaft that receives rotational force from a drive device, an output-side rotating body rotatably supported by the input shaft, and an output-side rotating body that can be operated to move in a thrust direction. a clutch ring; a cam ring movable in the thrust direction but not rotatable; a clutch means formed between the rotating body and the clutch ring and frictionally engaging the clutch ring by moving the clutch ring toward the rotating body in the thrust direction; and the clutch ring. and a cam ring, the clutch ring is moved toward the rotating body in the thrust direction by a relative deviation between the two, and the pressure angle is gradually reduced by a deviation of at least a predetermined amount. The structure includes a biasing means formed between the cam ring and the cam ring so as to be retractable toward the cam means in the thrust direction.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a 2-wheel to 4-wheel switching portion of a transfer 1 device used in a 4-wheel drive vehicle. The input shaft 1 is rotatably supported by a transformer 77 case (not shown) via a bearing 3, and is configured to receive rotational force from an engine serving as a drive device (not shown). A chain wheel 5 serving as an output-side rotating body is rotatably supported on the input shaft 1. The position of the chain wheel 5 in the thrust direction is regulated by the stepped portion 1a of the input shaft 1 and the circlip 7. A chain (not shown) is wound around the chain wheel 5, so that power can be transmitted to the front wheels.

On the other hand, a clutch ring 9 rotatably supported by the input shaft 1 is arranged on the negative side of the chain wheel 5 in the thrust direction. A circumferential groove 98 is provided on the outer periphery of this clutch ring 9.
A fork (not shown) is engaged with the fork, and the fork can be operated by an operating lever. Therefore, the clutch ring 9 is configured to be movable in the thrust direction.

Between the chainwheel 5 and the clutch ring 9, there is a thrust direction chainwheel 5 of the clutch ring 9.
Clutch means 11 that engages both *m by moving to the side
is provided. This clutch means 11 is constituted by an outer cone surface 11a provided on the clutch ring 9 and an inner cone surface 11b provided on the chain wheel 5.

Roughly speaking, a cam ring 13 is fitted to the input shaft 1 via a spline means 12 and is movable in the thrust direction, but is not rotatable with respect to the input shaft 1. A cam means 15 is provided between the clutch ring 9 and the cam ring 13. This cam means 15 is a clutch ring 9
The cam ring 13 is made up of a plurality of cam recesses 15a provided in the circumferential direction on the side surface of the cam ring 13, and a plurality of cam protrusions 15b formed on the cam ring 13 and fitted into the cam recesses 15a. Therefore, when the cam ring 13 is substantially integrated with the input shaft 1 side, the cam means 15 is configured to move the clutch ring 9 toward the chain wheel 5 side in the thrust direction by the relative displacement between the clutch ring 9 and the cam ring 13. has been done. Further, the cam recess 15a and the cam protrusion 15b are formed of curved surfaces, and the curvature of the former is larger than that of the latter.

Therefore, the pressure angle θ of the cam means 15 is configured to gradually become smaller due to the relative displacement between the clutch ring 9 and the cam ring 13 in the rotational direction.

The cam ring 13 and the bearing 3 as the input shaft 1 side
A gap 17 is provided between the cam ring 13 and the inner race to allow the cam ring 13 to retreat toward the bearing 3 side. Within this gap 17, the force ring 13 and the bearing 3
A leaf spring 19 as a biasing means is provided between the inner race of the
is interposed. Therefore, the leaf spring 19 is connected to the cam ring 1.
3 toward the thrust direction cam means so as to be retractable.

Further, the chain wheel 5 has a first spline portion 2.
3 is formed, and a second spline portion 27 is formed on the ring 25 meshed with the input shaft 1. The second spline portion 27 includes the first spline portion 23 and the second spline portion 2.
A sleeve 29 connecting the two is engaged with each other. The movement of the sleeve 29 is linked to an operating lever that operates the clutch ring 9, and the clutch ring 9 is moved by the first stage operation of the operating lever, and the sleeve 29 is moved by the second stage operation. ing.

Next, the operation of the first embodiment will be described.

When the clutch ring 9 is not moved and the clutch means 11 is not engaged, the driving force of the input shaft 1 is not transmitted to the chain wheel 5 but only to the rear wheel drive oJ axis. Therefore, the vehicle can run in two-wheel drive.

When the vehicle enters a rough road and it becomes necessary to switch to four-wheel drive while driving, a fork (not shown) is moved by an operation lever (not shown), and the clutch ring 9 is moved toward the chain wheel 5 side. This movement causes frictional engagement between the outer cone surface 11a and the inner cone surface 11b of the clutch means.

At this point, the fastening force is weak and the two slip, but the clutch ring 9 receives resistance from the chain wheel 5 side, so that the chain wheel 5 and the input shaft 1 side do not shift relative to the rotational direction. Therefore, the cam protrusion 15a is in the cam recess 1.
5b, the clutch ring 9 is moved toward the chain wheel 5 in the thrust direction. This movement strengthens the fastening force between the outer cone surface 11a and the inner cone surface 11tl.

At this time, if a torque of more than a predetermined value is generated to connect the outer cone surface 11a and the inner cone surface 11b due to sudden operation, the reaction force of this torque acts on the cam means 15 via the clutch ring 9. For this reason, the cam ring 9 is
When the plate spring 19 moves backward against the attached η horn fhL, the cam recess 15a and the cam protrusion 15b are further displaced in the rotational direction, and the pressure angle θ is further reduced. Therefore, the thrust force for engaging the clutch means 11 is reduced, and smooth engagement of the clutch means 11 can be expected even if a torque reaction force exceeding a predetermined value occurs.

Next, when the operating lever is operated to the second stage, the sleeve 29 is moved, the first spline part 23 and the second spline part 27 are connected, and the connection between the chain wheel 5 and the human power shaft 1 is reinforced. . Therefore, it is possible to switch to four-wheel drive even while the vehicle is running, making it easier to drive on rough roads.

If the operating lever is moved back one step, the connection at the sleeve 29 will be released, and if it is moved back two steps, the connection at the clutch ring 9 will be released. ,.

Note that the present invention is not limited to the above embodiment. For example, the first spline portion 23, the second spline portion 27, and the sleeve 29 may be omitted. Further, the cam means 15 is acted upon by a torque reaction force of 1- or more,
It is also possible to reduce the pressure angle gradually or stepwise only when the clutch ring and cam ring deviate from each other in the rotational direction by a predetermined amount or more. Furthermore, a stopper can be provided to stop the thrust force from decreasing. .

[Effects of the Invention] As is clear from the above, according to the configuration of the present invention, even during rotation, by moving the clutch ring, the input shaft and the rotating body can be smoothly connected through frictional engagement of the clutch means. The servo action of the cam means provides a strong connection. Therefore,
Problems caused by the synchro 8N structure can be eliminated without requiring a synchro mechanism. Moreover, if a torque reaction force of more than a certain level is applied from the rotating body side due to sudden operation, etc., the clutch ring and cam ring will further shift in the direction of rotation, and this shift will cause the cam ring to move backward against the biasing means. and the pressure angle of the cam means is reduced. Therefore, the thrust force of the cam means is reduced, and the clutch means can be engaged with less shock.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a cam means. 1... Input shaft 5... Chain wheel (rotating body) 9... Clutch ring 11... Clutch means 13... Cam ring 15... Cam means 19
...Plate spring (biasing means) Shi-2 knee 1st L4.1 2nd cause

Claims (1)

[Claims] an input shaft that receives rotational force from a drive device; an output-side rotating body that is rotatably supported by the input shaft; a clutch ring that is operable to move in the thrust direction; and a cam ring that is movable in the thrust direction and cannot be rotated; A clutch means is formed between the rotating body and the clutch ring and frictionally engages the two by moving the clutch ring toward the rotating body in the thrust direction; a cam means that moves the clutch ring toward the rotating body in the thrust direction and increases the servo by at least a predetermined deviation; and a cam means formed between the cam ring and the input shaft side and capable of retracting the cam ring toward the cam means in the thrust direction. A clutch device comprising: a biasing means for biasing the clutch device.