JPS58163822A - Shaft coupling of differential screw - Google Patents

Abstract

PURPOSE:To easily bond and separate both shafts by using a screw with different pitches as a differential screw for bonding both shafts of a shaft coupling to be fastened and unfastening same to be separated. CONSTITUTION:A through hole 2 and a screw 4 are mounted at the center of a shaft 1 for inserting a swirl tool such as a hexagon handle, a driver or the like. A female taper 3 is formed on the shaft bonding side. This female taper portion 3 is provided with a key groove 5 formed axially, if necessary. A shaft 6 to be bonded to the shaft 1 has the shaft end with a male taper 7, and the central portion of the shaft is provided with a screw 8 formed in the same direction as the screw 4 and in different pitches. A semicircular key groove 9 is mounted on the male taper portion 7 if necessary, and a semicircular key 10 is fitted therein. A screw shaft 11 which functions as a shaft coupling for bonding the shafts 1, 6 together comprises a screw engaged with the screw 4 of the shaft 1 and a screw engaged with the screw 8 of the shaft, which are mounted on both end portions thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft coupling that connects two shafts with a screw inserted through the shaft center.

Conventionally, normal shaft joints were fitted on the outside of both wheels as shown in Figure 1, and required space for the part that protruded outside the shaft to allow each shaft to run together using bolts. The shaft joints that fit together do not require any space for the joint because there are no outwardly protruding pipes, but if they are to be separated, tools other than tightening, such as pulley removal, are required.

The present invention has been made in order to solve the above-mentioned drawbacks, and aims to provide a shaft joint in which the shafts can be joined and separated very easily. It features a differential screw shaft coupling that can be loosened and separated.

An embodiment of the present invention will be described below based on Figures 113 and 4. A through hole 2 into which a turning tool such as a hexagonal handle or a driver can be inserted is drilled in the center of the first shaft 1, and a female taper 3 is cut on the side where the shaft is joined. A screw 4 with a right or left hand thread and a pitch of, for example, 1121 m is carved at the mouth. A keyway 5 is cut in the axial direction in the female taper part 3 if necessary. JI 2 to be joined to the first pongee 1 The shaft 6 has a male taper 7 formed at its end, and a right-handed or left-handed screw 8 in the same direction as the screw 4 with a larger or smaller pitch, for example, 1.2511!II, is carved in the center. A half-moon key groove 9 is cut into the male tapered portion 7 if necessary, and a half-moon key 10 is inserted therein.
The threaded shaft 11, which is a shaft joint that connects the @1 shaft 1 and the #I2 shaft 6, has a right-handed or left-handed thread that screws into the screw 4 of the first shaft 1, and a screw 12 with the same pitch of 1 mm and a screw 12 of the second shaft 6. A screw 13 of the same pitch 1 and 25 mm on the right or left side to be screwed with the screw 8 is carved on both ends, and the end of the screw 1211 has a hexagon socket for a hexagon handle or a full-sized hole for a flat head screwdriver for turning. It is formed.

To join both shafts 1 and 6 formed in this way, connect one of the shafts, now aI2, to the screw 8 of the shaft 6 and the screw 13 of the screw shaft 11.
Use the hexagonal handle to screw it into place. Next @1
The male taper 7 at the tip of the threaded glaze is exposed to the female tapered part 3 of the shaft 1, the key 10 and the keyway 5 are aligned in phase as necessary, and the tip of the threaded shaft 11 is pressed against the screw 4 of the single shaft 1. Then, insert a longer hexagonal handle from the rear of the through hole 2 of the first shaft 10 and fit it into the hexagonal hole 14 of the screw shaft 11.
1 is screwed into the two-way shaft 6 in the opposite direction, the screw 12 of the screw shaft 11 is screwed with the screw 4 of the first shaft 1. On the other hand, the screw 13 of the screw shaft 11 is pulled out from the screw 8 of the @2 shaft 6, so that the threaded portion is reduced.

In this case, if the thread pitch of both shafts is the same, the relative positional relationship will not change, but the pitch difference is 0.2511! ! 1, the two shafts approach each other by 0.25 rnm per rotation of the screw shaft, and are finally strongly joined by the wedge action of the screw. The length of each threaded portion is determined by the pitch size and pitch difference so that the number of threads that can withstand the joining force can be screwed together. In addition, the diameter of the intermediate portion between the threaded portions of the screw shaft may be made somewhat smaller, or the screw 4 may be carved on the side opposite to the joint portion to increase the length of the intermediate portion, and the tensile force may be applied to this portion. By causing elastic deformation so that tension is constantly generated, loosening of the joint can be reliably prevented. To separate the two wheels joined in this way, insert a hexagonal handle into the through hole 2 and turn the screw shaft 11 in the opposite direction to that used when joining. It is possible.

As detailed above, since the differential screw is used as the shaft coupling, the pitch difference can be made arbitrarily small, and it is possible to join with a large tightening force and to separate with a small rotational force. In addition, since the component is a single screw shaft, the manufacturing cost is low, and taper joining and separation can be performed extremely easily with a single handle, reducing assembly and separation time.

Furthermore, it has the characteristic that it can be stored compactly without requiring extra space for the shaft coupling.

[Brief explanation of drawings]

FIGS. 1 and 2 are vertical cross-sectional views showing a conventional joint. FIG. 83 is a vertical cross-sectional view showing a joint according to the present invention. FIG. 4 is a view showing a screw shaft of the joint. 1...#! 1st shaft 6... Female taper 4, 8... Screw 6... 2nd shaft 11... Bolt 12, 13... Screw 14...
Hexagonal hole Figure 1 Figure 2

Claims (1)

[Claims] (1) One jl to be joined! A through hole with a thread is drilled in the center of one shaft, and the above-mentioned IH is drilled in the center of the other IH2 shaft.
A screw shaft with two screws carved on one axis that are threaded in the same direction as the thread of the II shaft and with a pitch of 1st
1. A shaft coupling using a differential screw, characterized in that the shaft and the second shaft are screwed into respective threads, and the two wheels are connected and separated by a pitch difference by rotating the screw shafts.