JPH0735150A - Elastic coupling of power transmission device - Google Patents

Abstract

PURPOSE:To make any of an elastic block type elastic coupling or damper type elastic coupling installable to a common input shaft, in power transmission device. CONSTITUTION:In an elastic block type elastic coupling made up of fitting an internal tooth 5a installed on an inner periphery of an outer ring 5 and an outer tooth 11a installed in an outer periphery of an inner ring 11 via an elastic block 12 attached to the external tooth 11a, a pair of stoppers 13' in contact with both front and rear surfaces of the elastic block is installed in the outer ring 5, and these paired stoppers 13' are formed into ling form each, and a seal 17 is installed in space between the inner peripheral side and the inner ring, then a storage part of the elastic block is formed into an oil sump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for transmitting power from a drive shaft of an engine to an input shaft of a mission via an elastic joint.

[0002]

2. Description of the Related Art An elastic block in which an inner tooth engraved on the inner circumference of an outer ring and an outer tooth engraved on the outer circumference of the inner ring have been inserted into the outer tooth and fitted through an elastic block. Type elastic joints are publicly known, and for example, there are techniques of Japanese Utility Model Publication 2-18364 and Japanese Utility Model Publication 4-7382. According to this technique, an input shaft of a marine speed reducer has a fastening flange integrally formed at its end, and mounting bolts are screwed on the fastening flange and inner teeth to prevent the inner teeth from moving axially with respect to the input shaft. It was a structure that was fixed to the. Therefore, the input shaft has been a dedicated part for the elastic block type elastic joint.

[0003]

Therefore, in a marine speed reducer equipped with a damper type elastic joint, even if an elastic block type elastic joint is used in place of the damper type elastic joint in order to improve durability, the input shaft However, since the speed reducer must be disassembled, a large amount of change work is required, and two types of input shafts must be managed in inventory, resulting in high cost. Therefore, the present invention is intended to be able to be mounted on a common input shaft by either an elastic block type elastic joint or a damper type elastic joint.

[0004]

The present invention uses the following means in order to solve the above problems. That is, in the elastic block type elastic joint in which the inner teeth engraved on the inner circumference of the outer ring and the outer teeth engraved on the outer circumference of the inner ring are inserted into the outer teeth and fitted through the elastic block, A pair of stoppers, which come into contact with the front and rear surfaces of the elastic block, are provided on the outer ring, the pair of stoppers are formed in a ring shape, and sealing means is provided between the inner peripheral side and the inner ring of the elastic block. The accommodating portion is formed in an oil sump.

[0005]

By using such means, the inner ring 1
1 is an elastic block 12 on the spline 7a of the input shaft 7.
The inner ring 11 and the input shaft 7 can be detached and attached at the spline fitting portion by being held by the outer ring 5 by the stopper 13 via the stopper 13, and the inner ring 11 and the input shaft 7 can be attached and detached at the spline fitting portion. 1
Power is transmitted to the input shaft 7 via 1 as in the conventional case.
The housing portion of the elastic block 12 arranged between the inner teeth 5a and the outer teeth 11a is filled with lubricating oil to reduce noise and wear.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a side sectional view showing a first embodiment of a power transmission portion of the present invention, FIG. 2 is a side sectional view of a joint portion, FIG. 3 is a rear view of the same, and FIG. 4 is a sectional view of the power transmission portion of the present invention. 2 is a side sectional view showing a second embodiment, FIG. 5 is a side sectional view of a joint portion, and FIG. 6 is a side sectional view of a power transmission portion with a damper specification joint.

Referring to FIGS. 1 to 3, the power transmission section of the marine speed reducer will be described. A flywheel 3 is fixedly mounted on a drive shaft 1 of an engine by bolts 2, 2 ...
A gear 4 that meshes with the drive gear of the cell motor is fixedly mounted on the outer periphery of the flywheel 3, and an outer ring 5 has a bolt 6
6 ... is fixed and the outer ring 5 is formed in an annular shape,
Inner teeth 5a are formed on the inner circumference.

Further, an input shaft 7 is rotatably supported by a reduction case 9 via a bearing 10 at a coaxial center position behind the drive shaft 1, and a front end of the input shaft 7 is splined to the inner ring 11 by spline fitting. The outer ring 11 has the same number of outer teeth 11a as the inner teeth 5a of the outer ring 5 and is fitted to mesh with the inner teeth 5a. The outer teeth 11a are made of rubber or the like. Elastic block 12 is fitted,
A buffer is provided between the inner teeth 5a and the outer teeth 11a to absorb the torque fluctuation.

Further, disk-shaped stoppers 13, 13 are provided on both front and rear side surfaces of the meshing portion of the inner teeth 5a and the outer teeth 11a.
Are fixed to the outer ring 5 with screws 14, 14, and the elastic block 12 is clamped and fixed by the stoppers 13 and 13 so that it cannot move back and forth, and the inner ring 11 fitted with the elastic block 12 is fixed. Does not slide back and forth on the spline 7a.

The gear 7b provided on the rear portion of the input shaft 7 is meshed with the clutch teeth 16 on the clutch shaft 15,
The power from the drive shaft 1 is speed-shifted and decelerated from the flywheel 3, the outer ring 5, the elastic block 12, the inner ring 11 and the input shaft 7 via the clutch to drive the screw and the like.

Further, the meshing portion between the inner teeth 5a and the outer teeth 11a can be constructed as shown in FIGS. 4 and 5, and the stopper 13 'is formed in a ring shape to form the inner teeth 5a. And stoppers 13 'on both sides of the meshing part between the outer teeth 11a and
13 'is arranged, a seal 17 is arranged between the inner ring 1 and the center of the stopper 13', and an elastic block surrounded by the inner teeth 5a of the outer ring 5, the stopper 13 ', the seal 17 and the inner ring 11. By forming the accommodating portion 12 as an oil reservoir A and filling the oil reservoir A with lubricating oil, absorption of torque fluctuation and reduction of wear can be further improved.

Further, as shown in the sectional view of FIG. 7 and the perspective view of FIG. 8, the elastic block 12 does not have a structure in which the elastic block 12 is inserted into the internal teeth as in the conventional case, but the elastic block 12 'is It is also possible to set the width to be the same as the width of the inner teeth 5a and the outer teeth 11a so as to transmit the torque over the entire width, so that a large torque can be transmitted.

The elastic block type elastic joint as described above can be changed to a damper type elastic joint, and the structure of the damper type elastic joint is, as shown in FIG. 6, a disk plate 21 on the flywheel 3 '. Bolt 22
, While the spline hub 23 is spline-fitted on the spline 7a of the input shaft 7,
Torsion springs 24, 24 ... Are appropriately arranged on the disk portion 23a on the outer periphery of the spline hub 23, and the torsion springs 24, 24 ... Are sandwiched between the disc plate 21 and the retaining plate 25, and the disc The plate 21 and the retaining plate 25 are studs 26, 26 ...
Fixed so that one end of the torsion spring 24 is engaged with the tack 26 and the other end is engaged with the spline hub 23 so that the power is transmitted from the flywheel 3 to the input shaft 7 while being buffered. , Has an elastic effect.

With this configuration, when the elastic block type elastic joint is changed to the damper type elastic joint, if the deceleration case 9 is removed from the engine case 20,
The spline 7a of the input shaft 7 can be pulled out from the inner ring 11, the bolt 6 is removed, the outer ring 5 is removed from the flywheel 3, the bolt 2 is removed, and the flywheel 3 is replaced with a flywheel 3 '. , The disc plate 21 assembled with the spline hub 23, etc.
Is fixed to the flywheel 3'with bolts 22, the input shaft 7 is inserted into the spline hub 23, and the deceleration case 9 is attached to the engine case 20 to complete the change. However, the flywheels 3 and 3'may have the same shape, and in this case, only the outer ring 5 and the disc plate 21 need to be exchanged.

[0015]

Since the present invention is constructed as described above, it has the following effects. That is, in the elastic block type elastic joint according to claim 1, since the structure for disabling the axial movement of the inner ring with respect to the input shaft is provided between the outer ring and the inner ring, the inner ring and the input shaft are separated from each other. Spline fitting can now be adopted as a means for mounting so that it cannot rotate relative to each other, and it becomes possible to fit the spline part of this input shaft to the spline hub of the damper type elastic joint, and the damper type elastic joint and elastic block type elastic The joints can be interchanged with each other, making it possible to select according to the application, making maintenance easier. Further, as described in claim 2, since the oil can be stored by the seal between the inner teeth and the outer teeth, elasticity and durability can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of a power transmission unit of the present invention.

FIG. 2 is a side sectional view of a joint portion of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is a side sectional view showing a second embodiment of the power transmission section of the present invention.

FIG. 5 is a side sectional view of a joint portion of the same.

FIG. 6 is a side cross-sectional view of a power transmission unit whose joint is a damper specification.

FIG. 7 is a side sectional view of a joint portion having another configuration of the elastic block.

FIG. 8 is a perspective view of an elastic block according to another embodiment.

[Explanation of symbols]

 1 Drive shaft 3 Flywheel 5 Outer ring 5a Inner teeth 7 Input shaft 11 Inner ring 11a Outer teeth 12 Elastic block 13 Stopper 17 Seal 23 Spline hub 24 Torsion spring A Oil sump

Claims (2)

[Claims] 1. An elastic block-type elasticity in which inner teeth engraved on the inner periphery of an outer ring and outer teeth engraved on the outer periphery of the inner ring are inserted into the outer teeth and fitted through elastic blocks. In the joint,
An elastic joint for a power transmission device, wherein a pair of stoppers, which come into contact with the front and rear surfaces of the elastic block, are provided on the outer ring. 2. The pair of stoppers according to claim 1 are ring-shaped, and a sealing means is provided between the inner peripheral side of the pair of stoppers and the inner ring, and the accommodating portion of the elastic block is formed in an oil sump. An elastic joint of a power transmission device characterized by: