JPS60132155A - Power transmitting device - Google Patents

Abstract

PURPOSE:To make the torque at the starting small by a method wherein gears having different numbers of teeth each other are engaged such that one side gear is engaged to another gear bended in turn by a driving side member. CONSTITUTION:The engaging position of each gear part 9, 12 moves by the rotation of a driving shaft 3, namely a push roller 13, and a gear part 12 namely a flexible gear 10 is rotated in reduction determined by the numbers of teeth of each gear part 9, 12, because a gear part 9 is fixed. This reduction rate is (N-N0)/N when the numbers of teeth of a gear 8 is N0, and the numbers of teeth of the flexible gear 10 is N. A funnel type plate part 11 makes funnel shape in the condition that said plate part 11 is not pushed to the shaft direction by a roller part 15 of a push roller 13, and the pushed surface accordingly deflects when it is pushed to the shaft dirction by the roller part 15.

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 to transmit power. The present invention relates to a power transmission device that transmits 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 Special 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 deflects the cam to mesh with the internal gear, 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.

Although this device satisfactorily fulfills the above-mentioned functions, the internal gear is arranged around the outer circumference of the external gear which has a predetermined number of teeth, that is, an outer diameter, so the entire device becomes large.
In addition, since the force cam slides into contact with the inner circumferential 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 becomes large, especially when transmitting power. This involves the problem that the torque at startup is large, resulting in low power transmission efficiency.

Therefore, in order to solve this problem, the applicant of the present application has a base gear which is provided with teeth in a ring shape and is fixed to the casing, and a flexible circle &aCt+, and the teeth of the base gear are provided on the plate surface of the base gear. a flexure gear coupled to a driven shaft disposed coaxially with the base gear, and a flexible gear coupled to a driven shaft, the gear having a number of teeth different from that of the base gear, and coupled to the driven shaft, A power transmission device has been proposed that includes a bushing roller that presses the flexible disk portion in the axial direction so that each tooth portion of the base gear and the flexible gear mesh at at least one location in the circumferential direction.

With this product, we were able to obtain a power 1-m movement surface with high power transmission efficiency and a simple structure, which can greatly contribute to resolving the above-mentioned problems, but the amount of axial deflection of the bending gear ( If the amount of displacement (displacement amount) is further reduced, not only the durability of the flexural gear will be improved, but also the torque at startup will be reduced, and the power transmission efficiency will be further improved.

[Object of the Invention] The present invention has been made in view of the above points, and its object is to provide a power transmission device with high power transmission efficiency and improved durability.

[Disclosure of the invention] The power transmission device of the present invention has a base gear, a flexible gear, and a bush roller as basic elements, and the flexible gear has a funnel-shaped plate portion with a gentle slope formed of a flexible plate material. However, a tooth portion having a different number of teeth than the tooth portion of the base gear is provided on the outer wall surface of the base gear side, facing the tooth portion of the base gear, and is connected to a driven shaft disposed coaxially with the base gear. It is characterized by the fact that it is made to be

(Example) The present invention will be described below based on FIGS. 1 to 3 shown as an example.

Reference numeral 1 denotes a casing, which forms a box together with a base 2 fixed to cover the opening of the casing. A fitting hole 4 through which the drive shaft 3 is inserted is provided on the substantially solid axis of the casing 1 and the base 2;
An insertion hole 6 through which the driven shaft 5 is inserted is provided. A ball bearing 7 is installed in this insertion hole 6, and the frictional resistance of the driven shaft 5 supported by being inserted through the ball bearing 7 is reduced.

Reference numeral 8 denotes a base gear in which a ring-shaped tooth portion 9 is provided near the outer periphery of the inner surface of the base 2, and the tooth portion 9 has a tooth shape in the axial direction. Since this base gear 8 is provided on the base 2, it is fixed to the casing 1.

Reference numeral 10 denotes a flexible gear, which has a funnel-shaped plate portion 11 with a gentle slope formed of a flexible plate material, and has an outer wall surface 11 on the side of the base gear 8.
A toothed portion I2 having a different number of teeth than the toothed portion 9 of the base gear 8 is provided between the toothed portion 9 of the base gear 8 and the driven shaft described above, which is disposed coaxially with the base gear 8. 5. When the funnel-shaped plate part 11 is not bent (not displaced), this tooth part 12 does not mesh or slightly meshes with the opposing tooth part 9, and the funnel-shaped plate part 11 is bent by a predetermined amount in the axial direction ( In the displaced state, it is designed to fully mesh with the opposing teeth 9. Note that the funnel-shaped plate portion 11 and the tooth portion 12 may be integrally formed of plastic.

Reference numeral 13 denotes a bush roller, which consists of a roller holder 14 connected to the drive shaft 3 and extending in a direction perpendicular to the drive shaft 3 to near the outer periphery of the funnel-shaped plate portion 11 of the flexure gear IO, and a ball bearing mounted on the tip of the roller holder 14. It consists of a roller section 15. The two roller parts 15 are the base gear 8 and the flexible gear 10.
The funnel-shaped plate portion 1 is positioned so as to overlap with each tooth portion 9.12 of the
1 is bent (displaced) by a predetermined amount in the axial direction.
1b to rotate each tooth 9.12 in the circumferential direction.
Mesh in place. Further, the drive shaft 3 is provided with a support portion 3a on the side of the driven shaft 5 that supports the tip end shaft portion 5a, and a ball bearing 16 is interposed between the support portions 3a.

A ball bearing 17 is installed around the fitting hole 4 of the casing 1, and is in contact with the side surface of the roller holder 1'4.

Therefore, the bushing roller 1 is inserted into the fitting hole 4 of the casing 1.
3 coupled to the drive shaft 3, and the driven shaft 5 coupled to the flexible gear 10 to the ball bearing 7 of the base 2. Then, the tip shaft portion 5a of the driven shaft 5 is inserted into the support portion 3a of the drive shaft 3. The opening of the casing 1 is closed with the base 2 so as to be supported, and the base 2 is fixed to the casing 1. As a result, the roller portion 15 of the bush roller 130 presses the funnel-shaped plate portion 11 of the flexible gear 10 in the axial direction, and each tooth portion 9.
12 mesh at two locations in the circumferential direction.

Here, what should be noted is the funnel-shaped plate gl of the flexible gear 10.
+11 is not pressed in the axial direction by the roller portion 15 of the funsch roller 13, the funnel-shaped plate portion 11
As shown in Figure (a), it has a so-called funnel shape, but the roller part 1
5 begins to press in the axial direction, the pressing surface of the funnel-shaped plate part 11 bends (displaces) accordingly, but the funnel-shaped plate part 11 near the middle between the pressing surface and the suppressing surface ), the roller portion 15 bends in the opposite direction to the pressing direction, deforming the so-called funnel shape. That is, since the funnel-shaped plate part 11 is always pressed by the roller part 15, its so-called funnel shape is always deformed. This so-called funnel-shaped deformation is useful in reducing the amount of deflection (displacement) of the flexural gear 1°. That is, the deflection (displacement) of the funnel-shaped plate part 11 in the direction opposite to the pressing direction of the roller part 15 contributes to the disengagement of the tooth parts 9.12.

The so-called funnel-shaped inclination of the funnel-shaped plate portion 11 is similar to that of the roller portion 1.
5, the pressing surface has a gentle inclination that is approximately perpendicular to the axis. Therefore, even if the teeth 9.12 are slightly engaged in the state shown in FIG. 3(a), the teeth 9.12 are surely engaged in the state shown in FIG. 3(b), and the pressing surface and The teeth 9.12 near the middle of the face are reliably disengaged.

(Operation) To explain the operation of this power transmission device, as the drive shaft 3, that is, the bushing roller 13 rotates, the meshing position of each tooth portion 9, 12 moves accordingly, and the tooth portion 9 is fixed. The toothing 12, ie the flexural gear 10, rotates at a reduced speed determined by the number of teeth of each toothing 9.12.

For this reduction ratio, the number of teeth of the base gear 8 is N. , flexure gear 10
When the number of teeth is N, it becomes N-N, /N. In other words, N,
=98, N=100, 1150, and N,=
100, N-98, a reduction ratio of -1/49 (in the direction opposite to the rotational direction of the drive shaft 3) is obtained. Note that when each tooth portion 9.12 meshes at two locations in the circumferential direction, N. The difference in the number of teeth between and N is an integral multiple of 2. Also, in this example,
Each tooth portion 9.12 is engaged at two locations in the circumferential direction,
If the roller part 15 of the bushing roller 13 is made into one piece, and the non-toothed parts 9 and 12 are meshed at the same point C/, Il on the circumference, °ζ is also good. In this case, the difference in the number of teeth between No and N is an integral multiple of 1. do.

In this way, by determining 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 5.

[Effects of the Invention] Since the present invention is constructed as described above, the amount of deflection (displacement) in the axial direction of the flexible gear can be reduced, and the durability of the flexible gear is improved, as well as the I torque at startup is also reduced. Therefore, a power transmission device with high power transmission efficiency and simple structure can be provided.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, FIG. F is a sectional view, FIG. 2 is an exploded perspective view thereof, and FIG. 3(a)
(b) is a side view illustrating the bending state of the bending gear. 1 - Casing, 3 - Drive shaft, 5 - Driven shaft, 8 - Base gear, 10 - Flexible gear, 13 - Bush roller Patent applicant Matsushita Electric Works Co., Ltd. Patent attorney Patent attorney Sanko Takemoto (and 2 others) Figure 1 Figure 3 (a) Procedures September 20, 1982 Patent Application No. 241147 2 Name of the invention Power transmission device 3 Person making the amendment Relationship to the case Patent issue 1 Mrs. Address: 1048 Oaza Kadoma, Hatsuumikadoma City, Dai 1, Name (
583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent address 1048 Oaza Kadoma, J Tamadoma City, Osaka? ,? d
Contents of i-correct correction (1) IN-N, /NJ on the 8th line of page 19 of the specification is corrected to r <N-N, )/NJ. Representative Patent Attorney Toshimaru Takemoto

Claims (1)

[Claims] (1) In a power transmission device that includes gears with different numbers of teeth and in which a drive side member sequentially deflects one gear to mesh with the other gear to transmit power, the tooth portion is provided in a ring shape, and has a base gear fixed to the casing, and a funnel-shaped plate portion with a gentle slope formed of a flexible plate material, and has teeth different from the peaks of the heath gear on the outer wall surface on the side of the heath gear. a flexure gear coupled to a driven shaft disposed coaxially with the base gear, the flexible gear having a number of teeth facing the crest of the base gear; A power transmission device comprising: a bushing roller that presses the funnel-shaped plate portion in the axial direction so that each tooth portion of the flexural gear meshes with at least one circumferential position.