JPH03149417A - Torque transfer means - Google Patents

Abstract

PURPOSE:To smoothly transfer a driving force by mounting a cylindrical inner side wall onto one of the end section of a prime mover shaft and the end section of a driven shaft, and a cylindrical outer side wall onto the other one thereof respectively, disposing flexible leaf springs for the inner and outer side walls, and thereby forming working oil chambers and the like therein. CONSTITUTION:An end face plate 3 is attached onto the tip end of the end section 2 of a prime mover shaft, and splines 5 are formed on the tip end of the end section 4 of a driven shaft. One end face of a cylindrical inner side wall 6 is fixed on the end face plate 3, and an end face plate 8 is fixed onto the other end face of the wall. In addition, the splins 5 at the tip end of a shaft end section 4 are meshed with a cylindrical wall 10. Both of the inner side wall 6 and the outer side wall 10 are coaxial with a rotating center, 2 each of the end face plates 3 and 8 are perpendicular to the rotating center, and a casing is made up out of the inner side wall 6, the outer side wall 10 and of the end face plates 3 and 8. A plurality of bent leaf springs 12a and 12b is interposed between the inner side wall 6 and the outer side wall 10 within the casing. Each outer end of the leaf springs 12a is fitted into a groove 7, and each inner end of them is fitted into a groove 11. Each working oil chamber 14a and 14b is thereby formed between the leaf springs 12a and 12b.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to a means for transmitting rotational force from a driving shaft side to a driven shaft side, and in particular, a rotational force transmission means that is flexibly coupled with respect to the rotational direction of the driving shaft side and the driven shaft side. Regarding. [Prior Art and Problems to be Solved by the Invention] In various rotational force transmission mechanisms, smooth drive can be achieved by alleviating mechanical shocks caused by rapid fluctuations in rotational speed on the driving shaft side, sudden load fluctuations on the driven shaft side, etc. In order to perform force transmission, the driving force is transmitted through a flexible member in the direction of rotation. The present invention is a means for transmitting rotational force using such a flexible member, and is an improved rotational force transmission means that can be downsized, has a damper effect, and can operate smoothly. The purpose is to provide

[Means for Solving the Problems J] According to the present invention, the above object is to provide a rotational force transmitting means for coupling a driving shaft end and a driven shaft end that are arranged coaxially, the driving shaft A coaxial cylindrical inner wall is attached to one of the end and the driven shaft end, and a coaxial cylindrical outer wall is attached to the other inwardly than the inner wall, and the inner wall and A casing is formed including these to seal the space between the outer walls, and within the casing are a plurality of bent leaf spring bodies whose outer and inner ends are attached to the inner and outer walls, respectively. are arranged across the circumferential direction, two types of the plurality of leaf spring bodies having different deformation characteristics are arranged alternately, and a hydraulic oil chamber partitioned by the leaf spring bodies is formed in the casing. and is characterized in that these adjacent hydraulic oil chambers are communicated by a path with a small cross-section.
This is achieved by a rotational force transmission means. In the present invention, as the two types of leaf spring bodies having different deformation characteristics, those having different curvatures in the cross section perpendicular to the center of rotation of the end portion of the driving shaft and the end portion of the driven shaft may be used. Further, in the present invention, an outer end of the leaf spring body is received in a groove formed on an inner surface of the inner wall, and an inner end of the leaf spring body is received in a groove formed on an outer surface of the outer wall. The outer ends of one leaf spring body are received in each groove on the inner surface of the inner wall, and the inner ends of two adjacent leaf spring bodies are received in each groove on the outer surface of the outer wall. Accepted forms are possible. [Embodiments] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of a rotational force transmitting means according to the present invention, and FIGS. 2 and 3 are sectional views thereof. In these figures, 2 is the end of the driving shaft. 4 is the driven shaft end. 2a and 4a are a driving shaft rotation center and a driven shaft rotation center, respectively, and these coincide (hereinafter, these two rotation centers will be simply referred to as "rotation centers"). An end plate 3 is attached to the tip of the drive shaft end 2, and a spline 5 is formed at the tip of the driven shaft end 4. One end face of a cylindrical inner wall 6 is fixed to the end face plate 3, and an end face plate 8 is fixed to the other end face of the inner wall. Further, a cylindrical outer wall lO is engaged with the spline 5 at the tip of the driven shaft end portion 4. The inner wall 6 and the outer wall IO are coaxial with the center of rotation, and the two end plates 3.8 are perpendicular to the center of rotation. An annular casing is formed by the inner wall 6, the outer wall 1O, and the end plate 3.8. Inside the casing, a large number of bent leaf spring bodies are arranged between the inner wall 6 and the outer wall IO. There are two types of leaf spring bodies (12a, 12b), which are arranged alternately in the circumferential direction. The outer end of the leaf spring body is connected to a groove 7 formed on the inner surface of the inner wall 6 along the rotation center direction.
accepted within. Further, the inner end of the leaf spring body is received in a groove 11 formed on the outer surface of the outer wall 6 along the rotation center direction. As shown, within each groove 11 of the outer wall 10 are two adjacent leaf spring bodies 12.
The inner ends of a and 12b are housed together. As a result, the number of grooves 11 formed in the relatively small diameter outer wall 10 is reduced to half the number of grooves 7 in the inner wall 6. As best shown in FIG. 3, in the two types of leaf spring bodies mentioned above, the curvature of one leaf spring body 12a is larger than the curvature of the other leaf spring body 12b. Two leaf spring bodies 12a, 1 received in the same outer wall groove ll
A hydraulic oil chamber 14a is formed between the two leaf spring bodies 12b, which are received in the adjacent outer wall 11.
, 12a are formed with hydraulic oil chambers 14b, and these two types of hydraulic oil chambers having different shapes are arranged alternately in the circumferential direction. These hydraulic oil chambers are filled with hydraulic oil. Adjacent hydraulic oil chambers communicate with each other through a small cross-sectional path, that is, a small hole 13 of an appropriate diameter provided through each of the leaf spring bodies 12a and 12b. The path of the small cross section mentioned above includes the end plates 3, 8 and the leaf spring body 1.
An appropriate clearance between 2a and 12b can also be used. Although the hydraulic oil can flow to the adjacent hydraulic oil chamber, the seal mechanism prevents it from leaking to the outside. In this embodiment, when the driving shaft end 2 rotates, its rotational force is transmitted to the driven shaft end 4 via the inner wall 6, the leaf spring bodies 12a, 12b, and the outer wall IO. During this transmission, the circumferential positional relationship between the outer wall and the inner wall changes depending on the load on the driven shaft side, and the leaf spring bodies 12a, 12b are deformed. When the rotation speed on the driving shaft side changes or when the load on the driven shaft side changes, the state shifts to a corresponding equilibrium point. At this time, if there is no hydraulic oil in the hydraulic oil chambers 14a, 14b, the reaction deformation of the plate spring body deformation repeats, which causes vibration. However, in this embodiment, based on the presence of hydraulic oil, during the above state transition, the volume of one of the two types of hydraulic oil chambers decreases, and the volume of the other increases. That is, since the two types of leaf spring bodies 12a and 12b have different shapes and arrangements, they have different deformation characteristics, and therefore, the volume fluctuations during the above state transition are opposite between adjacent hydraulic oil chambers. Thus, the pressure increases in the hydraulic oil chamber where the volume decreases, and the pressure decreases in the hydraulic oil chamber where the volume increases, and based on this pressure difference, the pressure is transferred from the high pressure side hydraulic oil chamber to the adjacent low pressure side hydraulic oil chamber via the small hole 13. The hydraulic oil flows out into the oil chamber, and the resistance during the outflow suppresses repeated deformation of the leaf spring body, thus suppressing the generation of vibration. The rotational force transmitting means of this embodiment can be easily constructed by assembling each component as shown in FIG. Note that the hydraulic oil can be easily injected into the hydraulic oil chamber by providing an injection hole in the end plate, for example. Of course, in the above embodiment, the same effect can be achieved even if the driving shaft side and the driven shaft side are reversed.

[Effects of the invention]

As described above, according to the rotational force transmitting means of the present invention, it is possible to reduce the size, and vibration generation is suppressed by the damper effect, so that sufficiently smooth operation is possible.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of a rotational force transmitting means according to the present invention, and FIGS. 2 and 3 are sectional views thereof. '2; Driving shaft end, 4: Driven shaft end, 6: Cylindrical inner wall, 10: Cylindrical inner wall, 12a, 12b:
Leaf spring body, 13: Small hole, 14a, 14b: Hydraulic oil chamber.

Claims (3)

[Claims] (1) A rotational force transmitting means that connects a driving shaft end and a driven shaft end that are arranged coaxially, and has a coaxial cylindrical inner side attached to one of the driving shaft end and the driven shaft end. A wall is attached to the other wall, and a coaxial cylindrical outer wall is attached inwardly from the inner wall, and a casing is formed including these to seal the space between the inner wall and the outer wall. Inside the casing, a plurality of bent leaf spring bodies are arranged across the circumferential direction, the outer ends and inner ends of which are respectively attached to the inner wall and the outer wall, and the plurality of leaf spring bodies are Two types with different deformation characteristics are arranged alternately, and a hydraulic oil chamber partitioned by the leaf spring body is formed in the casing, and these adjacent hydraulic oil chambers are communicated by a path with a small cross section. A rotational force transmission means characterized by: (2) The rotational force transmitting means according to claim 1, wherein the two types of leaf spring bodies having different deformation characteristics have different curvatures in a cross section perpendicular to the center of rotation of the driving shaft end portion and the driven shaft end portion. (3) an outer end of the leaf spring body is received within a groove formed on the inner surface of the inner wall, and an inner end of the leaf spring body is received within a groove formed on the outer surface of the outer wall; The outer end of one leaf spring body is received in each groove on the inner surface of the inner wall, and the inner ends of two adjacent leaf spring bodies are received in each groove on the outer surface of the outer wall. The rotational force transmission means according to claim 1 or 2.