JPH0566332U - Clutch device - Google Patents

Abstract

(57) [Summary] [Purpose] To make the clutch operation smooth and reduce the clutch operation. [Structure] A peripheral groove 10 is formed on an outer peripheral surface of a clutch wheel 5 which is rotatably fitted to a shaft portion 3, and the peripheral groove 1 is formed.
A large number of small grooves are provided in 0, lubricating oil such as grease is filled in the peripheral groove 10, and a braking ring 12 having an inner diameter smaller than the outer diameter of the bottom of the peripheral groove 10 is forcibly fitted. . Both ends of the braking ring 12 are suppressed by stoppers to prevent the braking ring 12 from swinging around. When the power is transmitted, the clutch wheel 5 is stopped by the braking force of the braking ring 12, and when a force larger than the braking force is applied to the clutch wheel 5, the clutch wheel 5 can be rotated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clutch device incorporated in a power transmission mechanism between, for example, a motor and a driven body driven by the motor.

[0002]

[Prior Art]

 In general, a power transmission mechanism that drives a driven body by a motor has a safety mechanism that prevents the drive motor from causing a so-called motor lock even when the driven body stops rotating due to some external force. It is necessary to incorporate a clutch mechanism as a device. Conventionally, various structures of this type of clutch mechanism have been known, but generally, a friction plate provided on the driving side or the driven body side is pressed against the other side by an elastic body such as a spring, Is widely used in which power is transmitted by the frictional force, and when the driven body suddenly stops, the friction plate is rubbed to prevent motor lock.

[0003]

[Problems to be solved by the device]

 However, this type of conventional clutch mechanism has a large impact when the clutch is applied, the clutch operation is not smooth, the clutch noise is too loud, the mechanism becomes bulky and requires extra space. have.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a clutch device capable of performing a smooth clutch operation with a low clutch sound by an extremely simple mechanism.

[0005]

[Means for Solving the Problems]

 A clutch device according to the present invention for achieving the above-mentioned object has a circumferential groove formed on an outer peripheral surface of a clutch wheel which is rotatably fitted to a shaft portion, and has a plurality of widthwise grooves in the circumferential groove. Small groove is provided, and lubricating oil is filled in the circumferential groove, and a braking ring having an inner diameter smaller than the outer diameter of the bottom portion of the circumferential groove is forcibly fitted into the circumferential groove to form the braking ring. It is characterized in that a stopper for suppressing the rotation of is provided.

[0006]

[Action]

 In the clutch device having the above-described configuration, the rotation is stopped by the braking force of the braking ring of the clutch vehicle during normal power transmission, but when the driven body is stopped by some external force, the braking ring is controlled. The clutch wheel starts rotating against the power and prevents the drive motor from locking.

[0007]

【Example】

 The present invention will be described in detail with reference to the illustrated embodiment. The drawings show an embodiment in which the present invention is applied to a power transmission mechanism including a reduction mechanism between a drive motor and a driven body, FIG. 1 is a sectional view, and FIG. 2 is a front view seen from the direction of arrow A in FIG. Is.

A drive side gear 2 connected to a drive motor (not shown) is fitted to the fixed center shaft 1, and a sun gear 4 is formed at the tip of a shaft portion 3 which is integral with the drive side gear 2. It A clutch wheel 5 is loosely fitted to the shaft portion 3, and, for example, two planetary gears 7 are meshed between an internal gear 6 formed on the clutch wheel 5 and the sun gear 4. A driven body 8 is rotatably fitted to the central shaft 1, and convex shafts 9 projecting from the driven body 8 are loosely fitted to the central holes of the planetary gears 7.

A peripheral groove 10 is provided on the outer peripheral surface of the clutch wheel 5, and a large number of small grooves 11 are formed in the width direction at the bottom of the peripheral groove 10 as shown in FIG. A braking ring 12 as illustrated in FIG. 4 is forcibly fitted into the circumferential groove 10. The damping ring 12 is composed of a thick wire having good rigidity, and the inner diameter D1 of the ring portion 12a in the natural state is set to be smaller than the outer diameter D2 of the bottom portion of the circumferential groove 10 shown in FIG. The inner diameter D1 is forcibly expanded and fitted into the circumferential groove 10. Both ends 12b of the braking ring 12 are projected outward in parallel and are caught by, for example, a stopper 13 provided on a frame body as shown in FIG. 2, so that the braking ring 12 does not swing even if the clutch wheel 5 rotates. It plays a role of fixing. A bending portion 12c for increasing the tightening force on the clutch wheel 5 is formed at an intermediate portion of the braking ring 12. Lubricating oil 14 such as grease is pre-filled inside the circumferential groove 10 before fitting the braking ring 12, and this lubricating oil 14 is also contained in a large number of small grooves 11 as shown in FIG. It's getting in.

In the normal case, the clutch wheel 5 is in a stationary state in which its rotation is blocked by the fairly strong tightening force of the braking ring 12 which is forcibly fitted into the circumferential groove 10 of the clutch wheel 5. Therefore, when the drive-side gear 2 rotates, the planetary gear 7 that meshes with the sun gear 4 rotates around the sun gear 4, and therefore, via the convex shaft 9 fitted in the center hole of the planetary gear 7. The driven body 8 is decelerated and rotated, while the clutch wheel 5 remains stationary.

If the driven body 8 is stopped by some external force, the drive side gear 2, the sun gear 4 and the planetary gear 7 continue to rotate by the drive motor, but the center position of the planetary gear 7 is not driven. Since it is stopped by the convex shaft 9 of the driving body 8, the clutch wheel 5 having the internal gear 6 meshing with the planetary gear 7 starts idling against the braking force of the braking ring 12.

Therefore, the drive motor can continue to rotate even if the driven body 8 is stopped, and motor lock can be prevented. Since the lubricating oil 14 is interposed between the circumferential groove 10 and the braking ring 12, when the rotational force larger than the braking force of the braking ring 12 is applied to the clutch wheel 5, it is fixed. The clutch wheel 5 can idle smoothly and quietly against the braking ring 12 that is present. Further, it is possible to reduce wear due to friction between the circumferential groove 10 and the braking ring 12 and fatigue of parts due to impact at the time of clutching. Further, since the lubricating oil 14 has entered the large number of small grooves 11 provided in the circumferential groove 10, the lubricating action can be performed for a long period of time.

It should be noted that the above embodiments have been applied to the reduction gear mechanism including the planetary gears, but it goes without saying that the present invention can be applied to other various types of power transmission mechanisms or braking mechanisms.

[0014]

[Effect of the device]

 As described above, the clutch device according to the present invention can perform a smooth clutch operation with an extremely simple mechanism, produces almost no clutch noise, and absorbs the impact at the time of clutch to reduce fatigue and wear of parts. Can be made smaller. Also, the clutch mechanism takes up almost no space, so it is easy to downsize.

[Brief description of drawings]

FIG. 1 is a sectional view of an example.

FIG. 2 is a front view seen from the direction A in FIG.

FIG. 3 is a side view of a clutch vehicle.

FIG. 4 is a front view of a braking ring.

FIG. 5 is a partial cross-sectional view of the relationship between the clutch wheel and the braking ring.

[Explanation of symbols]

 1 Central shaft 2 Drive side gear 3 Shaft part 4 Sun gear 5 Clutch wheel 7 Planetary gear 8 Driven body 10 Circumferential groove 11 Small groove 12 Braking ring 13 Stopper 14 Lubricating oil

Claims (1)

[Scope of utility model registration request] 1. A peripheral groove is formed on an outer peripheral surface of a clutch vehicle that is rotatably fitted to a shaft portion, and a plurality of widthwise small grooves are provided in the peripheral groove. A stopper is provided which is filled with lubricating oil and forcibly fits a braking ring having an inner diameter smaller than the outer diameter of the bottom of the circumferential groove into the circumferential groove to suppress the rotation of the braking ring. Characteristic clutch device.