JPS60201144A - Motive power transmission device - Google Patents

Abstract

PURPOSE:To heighten the efficiency of motive power transmission, by providing a base gear and a flexible gear having a flexible disk portion, in a casing, by using a push roller to push these gears in the axial direction thereof, and by providing a means for displacing the push roller against the urging force of a spring. CONSTITUTION:A base gear 2 and a flexible gear 6 having a flexible disk portion 6a are provided in a casing 1. A push roller 7 is pushed in the axial direction thereof by a spring urging means 9. A means for displacing the push roller 7 against the spring-urging force of the means 9 is composed of an inclined plate 11, balls 12 and a clutch lever 13. As a result, the efficiency of motive power transmission is heightened. When motive power being transmitted is to be cut off, the clutch lever 13 is operated so that a clutch function is fulfilled.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a power transmission device, in particular, a power transmission device including gears having different numbers of teeth, in which a driving side member sequentially deflects one gear to mesh with the other gear, and This invention relates to a power transmission device that extracts power from the gear and transmits the power.

[Background Art] This type of power transmission device transmits power at a significantly reduced speed, and is therefore widely used in transportation, elevating devices, industrial machinery, and the like. The conventional power transmission device of this type is the Japanese Patent Publication No. 57-10298.
As shown in Japanese Utility Model Publication No. 50-36137, a pair of internal gears having different numbers of teeth, a ring-shaped external gear disposed inside the internal gear, and a ring-shaped external gear disposed inside the internal gear, It includes a cam that is placed inside and engages the internal gear by deflecting wear, one of the internal gears is fixed to the casing, and by rotating the cam, power is extracted from the other internal gear. It was something that

This device satisfactorily fulfills the functions described above, but since the internal gear is arranged around the outer circumference of the external gear, which has a predetermined number of teeth and an outer diameter, the entire device is large. turned into
In addition, since the cam slides into contact with the inner peripheral surface of the ring-shaped external gear and does not bend the external gear into an elliptical shape, the sliding resistance between the cam and the external gear increases during power transmission, especially during startup. The torque is large, and therefore the power transmission efficiency is low. In addition, the BW clutch function could not be achieved because the power is interrupted and disconnected during power transmission.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a power transmission device that has high power transmission efficiency, has a clutch function, and has a simple structure. There is something to do.

[Disclosure of the Invention] The power transmission device of the present invention includes a casing with an open side, a base gear having a ring-shaped peak portion and fixed to the opening of the casing, and a flexible disc portion. and a mountain portion having a different number of teeth than the tooth portion of the base gear is provided on the plate surface facing the tooth portion of the base gear, and is coupled to a driven shaft arranged coaxially with the base gear. a flexible disc portion coupled to a drive shaft and movable in the axial direction, the flexible disk portion being pressed in the axial direction so that the base gear and the lower part of each of the flexible gears mesh at at least one location in the circumferential direction; a bushing roller for pushing the bushing roller, a spring-biasing means for spring-biasing the bushing roller so as to press the flexible disk portion, and a displacement means capable of displacing the bushing roller against the spring biasing of the biasing means. It is characterized by the following points.

(Example) The present invention will be described below based on FIGS. 1 and 2, which are shown as an example.

Reference numeral 1 denotes a casing with an opening on one side, which forms a box together with a base gear 2 which also serves as a lid and is fixed to the casing by keeping the opening cool.

The base gear 2 has a ring-shaped tooth portion 2b in which a tooth profile is formed in the axial direction near the outer periphery of the inner surface of the base plate 2a.

An insertion hole 1a through which the drive shaft 3 is inserted and an insertion hole 2c through which the driven shaft 4 is inserted are provided approximately on the central axes of the casing 1 and the base gear 2, respectively. Reference numeral 5 denotes a ball bearing installed in the insertion hole 2c, which in this embodiment supports the driven shaft 4 and reduces friction during its rotation.

Reference numeral 6 denotes a flexible gear, which has a flexible disk portion 6a made of plastic and formed into a thin plate shape, and has a tooth portion 6b having a different number of teeth than the tooth portion 2b of the base gear 2 on the plate surface on the base gear 2 side. It is provided opposite to the tooth portion 2b of the gear 2, and is coupled to the above-mentioned driven shaft 4, which is disposed coaxially with the base gear 2. This tooth portion 6b does not mesh with the opposing tooth portion 2b when the flexible disk portion 6a is not bent, and when the flexible disk portion 6a is bent by a predetermined amount in the axial direction, the tooth portion 6b does not mesh with the opposing tooth portion 2b. Designed to mesh with 2b. Note that the flexible disc portion 6a may be made of a metal spring material in consideration of strength and durability.

Reference numeral 7 denotes a bush roller, which is composed of a roller holder 7a that is connected to the drive shaft 3 and extends in a direction perpendicular to the drive shaft 3 to near the outer periphery of the flexible disk portion 6a of the flexure gear 6, and a ball hair ring attached to the tip of the roller holder 7a. 2 (IU). This bushing roller 7 is positioned so that the two roller parts 7b overlap with the tooth parts 2b and 6b of the base gear 2 and the flexible gear 6, and the flexible disk part 6a The bushing roller 7 connected to the drive shaft 3 is a member for pressing the teeth so as to bend by a predetermined amount in the axial direction so as to engage the teeth 2b and 6b at two positions in the circumferential direction. The drive shaft 3 is provided with a support part 3a on the driven shaft 4 side that supports the distal end shaft part 4a, and a ball bearing 8 is interposed between them. .

Reference numeral 9 denotes a biasing means such as a disc-shaped leaf spring, which biases the bush roller 7 with a spring so as to press the flexible disc portion 6a of the flexure gear 6. Normally, this spring bias force causes the bush roller 7 to press against the flexible disk portion 6a of the flexure gear 6. It is located closest to the bending gear 6 in the directional movable range. Therefore, the flexible disk portion 6a of the flexible gear 6 is deflected by a predetermined amount in the axial direction, and each of the tooth portions 2b and 6b meshes at two positions in the circumferential direction. Reference numeral 10 denotes a ball hair ring mounted around the insertion hole 1a of the casing 1, and is in contact with the upper surface of the central portion of the biasing means 9.

Next, the present invention will be explained in detail. 11 is an inclined plate fixed to the drive shaft 3 so as to face the outer surface of the bottom 1b of the casing 1 with a slight gap;
The outer circumferential portion 11b faces the outer surface in parallel and is inclined away from the outer surface of the bottom portion 1b. A ball 12 is fitted in a ring-shaped groove IC recessed on the outer surface of the bottom portion 1b, and is held by the recess 13a of the thalassograph 13 and the outer peripheral portion 11b of the inclined plate 11. In other words, the slight gap between the inclined plate 11 and the outer surface of the bottom portion 1b is sufficient to hold the ball 12 described above. Also, the groove IC width is the ball 12
The ball 12 is normally located on the outer circumferential side within the groove IC. The thalasso chireper 13 is vertically opposed to each other with the drive shaft 3 in between, and a base end 13b is pivotally supported on the outer surface of the bottom portion 1b by a pin 14, and an operating portion 13c is bent at the tip. Furthermore, a coil spring 15 having a weak spring force is compressed and loaded between the two rasochlears 13. The inclined plate 11, the ball 12, and the clutch function 13 constitute a displacement means capable of displacing the bushing roller 7 against the spring bias of the biasing means 9.

(Operation) Next, the operation will be explained. When the drive shaft 3, that is, the push roller 7 rotates, since the base gear 2 and the casing 1 are fixed, the meshing positions of the teeth 2b and 6b move accordingly, and the teeth 6b, that is, the flexible gear 6 rotates at a reduced speed determined by the number of teeth of each tooth portion 2b, 6b.

For this reduction ratio, the number of teeth of the base gear 2 is N. , where N is the number of teeth of the bending gear 6, N-N, /N.

In other words, when N,=98 and N=100, 1150,
Also, when N = 100 and N = 98, -1/49
A reduction ratio (in the direction opposite to the rotational direction of the drive shaft 3) is obtained.

In addition, when each tooth part 2b, 6b meshes at two places in the circumferential direction, the difference in the number of teeth between No and N is an integral multiple of 2. In addition, in this embodiment, the teeth 2b and 6b are engaged at two locations in the circumferential direction, but the roller section 7b of the bushing roller 7 is engaged at one location.
The tooth portions 2b and 6b may be individually meshed at one location in the circumferential direction, and in this case, the difference in the number of teeth between No. and N. is an integral multiple of 1.

In this way, by adjusting the number of teeth of No and N appropriately,
The power of the drive shaft 3 is appropriately decelerated and transmitted to the driven shaft 4.

If you want to intermittent power transmission, push up or down the operating part 13C of the thalassotile lever 13 against the spring force of the coil spring 15, and the ball 12 will move to the inner circumference inside the groove IC. As a result, the inclined plate 11, that is, the bush roller 7 also moves to the right in the figure against the spring force of the biasing means 9. Therefore, the bending gear 6 is released from the pressure and returns to its original state, and the teeth 2b and 6b no longer mesh.
Stop power transmission. In other words, by operating the thalassotile lever 13, the clutch function is achieved. In addition, when the load torque increases abnormally, the biasing means 9 becomes unable to maintain the meshing state of the teeth 2b and 6b with its spring force, and this automatically stops power transmission. This has the effect of preventing damage to each member.

[Effects of the Invention] Since the present invention is configured as described above, the teeth of the base gear and the flexible gear are disposed so as to overlap each other in a plan view, and the meshing occurs when the flexible gear is slightly deflected in the axial direction. So,
It is smaller and thinner than the conventional gear, and since the flexible disc part of the flexural gear is pressed in the axial direction, the deformation rotational resistance is well balanced, and the starting torque of the drive shaft is small, and each Since the tooth part has an overlapping meshing position in a plane,
The bank clash between the drive shaft and the driven shaft is reduced, and the base gear is located on the tangential line with respect to the arc-shaped teeth of the flexible gear when the teeth are in mesh.
Compared to conventional gears, the arc-shaped teeth of the flexural gear have less twisting and have a longer lifespan, resulting in higher power transmission efficiency.Furthermore, if you want to intermittent power transmission, operate the thalassotile lever. Therefore, it is possible to provide a power transmission device that can perform a clutch function and has a simple structure.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being an exploded perspective view thereof. 1-casing, 2-base gear, 3-drive shaft, 4-driven shaft, 6-flexible gear, 7-pseudo roller, 9-biasing means, 11--inclined plate, 12-ball, 13-clutch lever 0 Patent Applicant Matsushita Electric Works Co., Ltd. Representative Patent Attorney Takemitsu Senkou (2 idiots) Figure 1

Claims (1)

[Claims] +11 - has a casing with an open side, a base gear having ring-shaped teeth and fixed to the opening of the casing, and a flexible disc part, with the teeth of the base gear on the plate surface. A flexible gear having a tooth portion having a different number of teeth opposite to the tooth portion of the base gear and coupled to a driven shaft disposed coaxially with the base gear; a bushing roller that is movable in the axial direction and presses the flexible disc portion in the axial direction so that the tooth portions of the base gear and the flexure gear mesh at at least one position in the circumferential direction; A power transmission device comprising a biasing means for biasing a spring so as to press a flexible disk portion, and a displacement means capable of displacing the bushing roller against the spring bias of the biasing means.